INVESTIGADORES
RAPELA Carlos Washington
artículos
Título:
Early Carboniferous sub- to mid-alkaline magmatism in the Eastern Sierras
Autor/es:
ALASINO, P.H.; DAHLQUIST, J.A.; PANKHURST, R.J; GALINDO, C.; CASQUET, C.; RAPELA, C.W.; LARROVERE, M.; FANNING, C.M
Revista:
GONDWANA RESEARCH
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 22 p. 992 - 2008
ISSN:
1342-937X
Resumen:
A recently discovered granitic intrusion at Cerro La Gloria in western Sierra de Famatina (NW Argentina) is
representative of sub- to mid-alkaline Carboniferous magmatism in the region. The main rock type consists
of microcline, quartz and plagioclase, with amphibole, magnetite, ilmenite, biotite, epidote, zircon, allanite
and sphene as accessory minerals. We report a UPb zircon SHRIMP age for the pluton of 349±3 Ma
(MSWD=1.1), i.e., Tournaisian. Whole-rock chemical composition and Nd isotope analyses are compatible
with an origin by melting of older mafic material in the lower crust (åNdt between −0.58 and +0.46 and
TDM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
TDM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
(MSWD=1.1), i.e., Tournaisian. Whole-rock chemical composition and Nd isotope analyses are compatible
with an origin by melting of older mafic material in the lower crust (åNdt between −0.58 and +0.46 and
TDM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
TDM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pb zircon SHRIMP age for the pluton of 349±3 Ma
(MSWD=1.1), i.e., Tournaisian. Whole-rock chemical composition and Nd isotope analyses are compatible
with an origin by melting of older mafic material in the lower crust (åNdt between −0.58 and +0.46 and
TDM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
TDM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
fic material in the lower crust (åNdt between −0.58 and +0.46 and
TDM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
DM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes
that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
fied as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras
Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic
rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a
greater contribution of juvenile material of mantle character to the west. Based on the observed patterns
of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.
field relationships we suggest that A-type magma genesis in the Eastern
Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its
generation.