INVESTIGADORES
CRISTALLINI Ernesto Osvaldo
capítulos de libros
Título:
Basement double-wedge thrusting in the northern Sierras Pampeanas of Argentina (26°S): constraints from deep seismic reflection
Autor/es:
CRISTALLINI, E.O.; COMINGUEZ, A.; RAMOS, V.A.; MERCERAT, D.
Libro:
Thrust Tectonics and hydrocarbon system
Editorial:
American Association of Petroleum Geologists, Memoir 82
Referencias:
Año: 2004; p. 65 - 90
Resumen:
Deep seismic reprocessing of industrial lines, combined with surface geologic
and structural data, provides the basis of a new tectonic interpretation of the
northern Sierras Pampeanas at 278S latitude. These basement mountain blocks,
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
and structural data, provides the basis of a new tectonic interpretation of the
northern Sierras Pampeanas at 278S latitude. These basement mountain blocks,
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
and structural data, provides the basis of a new tectonic interpretation of the
northern Sierras Pampeanas at 278S latitude. These basement mountain blocks,
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
eep seismic reprocessing of industrial lines, combined with surface geologic
and structural data, provides the basis of a new tectonic interpretation of the
northern Sierras Pampeanas at 278S latitude. These basement mountain blocks,
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
8S latitude. These basement mountain blocks,
uplifted during an episode of shallowing of the subduction zone, show an active doublewedge
thrusting. Deep seismic data indicate the different vergences of the western and
eastern sectors of the Sierra de Aconquija, in thewestern Sierras Pampeanas at this latitude.
Neotectonic evidence reveals that both systems are active, although the western sector
has been active since at least middle to late Miocene times and recorded amuch greater
uplift and horizontal displacement than did the east. The eastern sector, although presently
active, recorded only minor uplift and displacement. These facts enable correlation
of the events in the northern Sierras Pampeanas with analog and numerical
models that predict the behavior of double-wedge thrusting.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.
A by-product of this analysis is the knowledge that a middle Miocene Atlantic transgression
covered the entire region, prior to the uplift of the Sierra de Aconquija. Based on
correlation of the foreland basin deposits on both sides of the range, two stages of development
are recognized. A single foreland basin covered the study area at an early stage,
during the marine transgression (13.5 Ma), and at a late stage, a broken foreland basin
developed.