Results 191 to 200 of about 151,062 (248)

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
openaire   +1 more source

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
openaire   +1 more source

Petrogenesis of the F-rich peraluminous A-type granites: An example from the Devonian Achala batholith (Characato Suite), Sierras Pampeanas, Argentina

, 2020
The Characato suite (Achala batholith, Sierras Pampeanas, Argentina), consists of at least six granitic facies with affinities of F-rich moderately to strongly peraluminous A-type granites.
Matías M. Morales Cámera, J. Dahlquist, M. García-Arias, J. Moreno, C. Galindo, M. Basei, J. Molina   +6 more
semanticscholar   +1 more source

A combined zircon Hf isotope and whole-rock Nd and Sr isotopes study of Carboniferous A-type granites, Sierras Pampeanas of Argentina

Journal of South American Earth Sciences, 2020
We report new whole-rock Nd and Sr isotope data for two strongly peraluminous and one slightly peraluminous Carboniferous A-type granitic plutons in the eastern Sierras Pampeanas of Argentina.
J. Dahlquist, C. Galindo, Matías M. Morales Cámera, J. Moreno, P. Alasino, M. Basei, Marcos Simón Macchioli Grande   +6 more
semanticscholar   +1 more source

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
openaire   +1 more source

New geochronological and isotope data for the Las Chacras – Potrerillos and Renca batholiths: A contribution to the Middle-Upper Devonian magmatism in the pre-Andean foreland (Sierras Pampeanas, Argentina), SW Gondwana

Journal of South American Earth Sciences, 2019
The Las Chacras-Potrerillos together with the Renca batholith (Sierras de San Luis) are the largest Devonian igneous bodies in the Sierras Pampeanas after the Achala batholith (Sierra de Cordoba), all emplaced in the Devonian foreland region.
J. Dahlquist, Marcos Macchioli Grande, P. Alasino, M. Basei, C. Galindo, J. Moreno, Matías M. Morales Cámera   +6 more
semanticscholar   +1 more source

Triassic-Jurassic thermal evolution and exhumation of the western Gondwana foreland: Thermochronology and basalt thermobarometry from the Argentine Sierras Pampeanas

, 2020
The geological record of the eastern Sierras Pampeanas province, in the modern Andean broken foreland of Argentina can be divided into four main events: (1) Proterozoic to early Paleozoic collisional tectonics, (2) middle-late Paleozoic anorogenic ...
F. Martina, Pilar Avila, F. Dávila, M. Parra   +3 more
semanticscholar   +1 more source

Depositional age and provenance in the San Luis Formation, Sierras Pampeanas, Argentina: Evidence from detrital zircon studies

Journal of South American Earth Sciences, 2019
The San Luis Formation is one of the lithostratigraphic units constituting the early Paleozoic crystalline basement of the Sierras de San Luis, which are part of the Sierras Pampeanas of central Argentina.
Juan M. Perón Orrillo, Ariel E. Ortiz Suárez, D. Rivarola, J. Otamendi, Augusto F. Morosini, R. Romero, M. Leisen, F. Barra   +7 more
semanticscholar   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source