Results 171 to 180 of about 5,277 (203)

Proterozoic metavolcanics from western Sierras Pampeanas terrane, Argentina

Journal of South American Earth Sciences, 1994
Abstract A series of medium grade metamorphic rocks of the western sector of the Sierras Pampeanas Terrane in central western Argentina are represented by amphibolites, gneisses and schists derived from sedimentary as well as from igneous rocks. The metavolcanics consist of amphibolites, quartz-K-feldspar-muscovite schists, and hornblende-biotite and
G. Vujovich, H. Miller, V.A. Ramos
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Paleozoic deformation in the Sierras de Cordoba and Sierra de Las Minas, eastern Sierras Pampeanas, Argentina

Journal of South American Earth Sciences, 2003
Basement orthogneisses, paragneisses, and migmatites in the Sierras de Cordoba of the eastern Sierras Pampeanas of central Argentina represent remnants of a Cambrian arc and accretionary prism that initially formed above a subduction zone along the early Cambrian margin of Gondwana.
Carol Simpson, Richard D. Law, L.Peter Gromet, Roberto Miro, C.J. Northrup   +4 more
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Quaternary intraplate deformation in the southeastern Sierras Pampeanas, Argentina

Journal of Seismology, 2001
Neogene strain from the subducting Nazca plate is widely distributed in theAndean foreland as a result of flat-lying subduction beneath central westernArgentina (28°–33°S latitude). This fact is indicated byuplifted basement blocks bounded by reverse faults as far as 600 kms eastof the Chilean trench axis.
Carlos H. Costa, M. Victoria Murillo, Guillermo L. Sagripanti, Carlos E. Gardini   +3 more
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Granitoids of the Tafi Megafracture (Sierras Pampeanas, Argentina): Petrogenetic implications

Journal of South American Earth Sciences, 1989
Abstract A group of small Ordovician-Silurian plutons was emplaced in the Tafi Megafracture of the Sierras Pampeanas, Argentina. These granites, with some peraluminous features, vary from types with andesine, biotite, magmatic epidote, and sometimes sphene, to other muscovitic types with albite and sometimes garnet (almandine-spessartite), reflecting
A.J. Toselli, J.N. Rossi de Toselli, J. Saavedra, E. Pellitero   +3 more
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Palaeolandsurfaces and neotectonic analysis in the southern Sierras Pampeanas, Argentina

Geological Society, London, Special Publications, 1999
Abstract The Sierras Pampeanas of northwestern Argentina are ranges underlain by crystalline basement rocks bounded on their western margins by N-S trending reverse faults along which uplift took place during the Andean orogeny. A pre-uplift regional erosion surface is commonly preserved on the eastern slopes which have been tilted in most ...
Carlos H. Costa, Aldo D. Giaccardi, Emilio F. González Díaz   +2 more
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Late Holocene faulting in the southeast Sierras Pampeanas of Argentina

Geology, 1996
The seismic history of extra-Andean South America is poorly documented. Between lat 26°S and 33°S, about 375 km east of the fold-and-thrust belt that marks the present orogenic front, the block-faulted crystalline basement uplifts of the Sierras Pampeanas in Argentina reveal extensive Quaternary reverse faulting. 14C dates of 1080 ± 70 and 1310 ± 40 yr
Carlos H. Costa, Claudio Vita Finzi
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The metamorphic basement of the southern Sierra de Aconquija, Eastern Sierras Pampeanas

2017
The Eastern Sierras Pampeanas are mainly composed of Neoproterozoic-early Palaeozoic metamorphic complexes whose protoliths were sedimentary sequences deposited along the western margin of Gondwana. South of the Sierra de Aconquija, Eastern Sierras Pampeanas, a voluminous metamorphic complex crops out.
Eugenia Cisterna, Clara, Altenberger, Uwe (Dr.), Mon, Ricardo, Günter, Christina (Dr.), Gutierrez, Adolfo Antonio   +4 more
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Transpressive deformation in the southwestern part of the Sierra de San Luis (Sierras Pampeanas, Argentina)

Journal of South American Earth Sciences, 1998
Abstract In the southwestern part of the Sierra de San Luis, clastic sediments of the Phyllite Group are assigned to the Late Precambrian–Early Cambrian interval and contain acid meta-mamatic dykes. Deposits of the Micaschist Group are interpreted as deeper crustal equivalents. Lower Ordovician intrusions of the Bemberg and Las Verbenas Tonalites, as
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Mineralogy and Geochemistry of an Epithermal Manganese District, Sierras Pampeanas, Argentina

International Geology Review, 2004
The manganese mineralization studied in this paper represents the major concentration of this element in Argentina. It occurs in an area of 70 x 30 km, in the Sierras Pampeanas ranges, located in the provinces of Cordoba and Santiago del Estero. The analyzed area represents about 30% of the entire mineralized system.
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Mt Studies At Sedimentary Basin Of Sierras Pampeanas, Argentina

6th International Congress of the Brazilian Geophysical Society, 1999
Cristina Pomposiello, Ana Osella, Alicia Favetto, Claudia Sainato   +3 more
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