INVESTIGADORES
CRISTALLINI ernesto Osvaldo
artículos
Título:
Estructura y estratos de crecimiento en la faja plegada y corrida de los Andes Fueguinos.
Autor/es:
GHIGLIONE, M.C.; RAMOS, V.A.; CRISTALLINI, E.O.
Revista:
REVISTA GEOLóGICA DE CHILE
Editorial:
Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Referencias:
Año: 2002 vol. 29 p. 3 - 27
ISSN:
0716-0208
Resumen:
Fueguian Andes foreland fold and thrust belt: structure and growth strata. Foreland basin deposits
involved in the Fueguian foreland fold and thrust belt were studied on the Atlantic coast of Tierra del Fuego. More
specifically, growth strata developed in middle Eocene sequences deposited in the wedge top depozone were analyzed.
Restoration methods and kinematics forward modeling were applied, revealing folding kinematics and defining the
geometry of the structure at various stages in its geological history. The folded units are characterized by strong
competency contrasts and display a transition in deformation behavior from detachment folding to progressive fault
propagation with increasing shortening. The evolution of this sector can be summarized in two different tectonic pulses:
(1) lower to middle Eocene: development of detachment folding with limb rotation; sedimentation rate was always lower
relative to fold growth rate and both of them decreased with time. (2) upper Eocene?-Oligocene: Continued shortening
resulted in the propagation of thrust faults through competent units on the steep front limb and the migration northward
of the foreland basin system; probably related to generalized wrench kinematics which affected the region.
competency contrasts and display a transition in deformation behavior from detachment folding to progressive fault
propagation with increasing shortening. The evolution of this sector can be summarized in two different tectonic pulses:
(1) lower to middle Eocene: development of detachment folding with limb rotation; sedimentation rate was always lower
relative to fold growth rate and both of them decreased with time. (2) upper Eocene?-Oligocene: Continued shortening
resulted in the propagation of thrust faults through competent units on the steep front limb and the migration northward
of the foreland basin system; probably related to generalized wrench kinematics which affected the region.. Foreland basin deposits
involved in the Fueguian foreland fold and thrust belt were studied on the Atlantic coast of Tierra del Fuego. More
specifically, growth strata developed in middle Eocene sequences deposited in the wedge top depozone were analyzed.
Restoration methods and kinematics forward modeling were applied, revealing folding kinematics and defining the
geometry of the structure at various stages in its geological history. The folded units are characterized by strong
competency contrasts and display a transition in deformation behavior from detachment folding to progressive fault
propagation with increasing shortening. The evolution of this sector can be summarized in two different tectonic pulses:
(1) lower to middle Eocene: development of detachment folding with limb rotation; sedimentation rate was always lower
relative to fold growth rate and both of them decreased with time. (2) upper Eocene?-Oligocene: Continued shortening
resulted in the propagation of thrust faults through competent units on the steep front limb and the migration northward
of the foreland basin system; probably related to generalized wrench kinematics which affected the region.
competency contrasts and display a transition in deformation behavior from detachment folding to progressive fault
propagation with increasing shortening. The evolution of this sector can be summarized in two different tectonic pulses:
(1) lower to middle Eocene: development of detachment folding with limb rotation; sedimentation rate was always lower
relative to fold growth rate and both of them decreased with time. (2) upper Eocene?-Oligocene: Continued shortening
resulted in the propagation of thrust faults through competent units on the steep front limb and the migration northward
of the foreland basin system; probably related to generalized wrench kinematics which affected the region.