Buscar
Mostrando ítems 11-20 de 242
A hydrothermal clay mineral assemblage at the Late Proterozoic unconformity in the Buenos Aires Complex - La Tinta Formation, Barker area, Tandilia Ranges (Argentina)
(Mineralogical Society, 2010-06)
A general alteration pattern of two transitional clay mineral assemblages was determined by petrography and X-ray diffractometry studies at the Tandilia Late Proterozoic unconformity zone, around the Barker locality: (1) ...
Supercontinent evolution and the Proterozoic metallogeny of South America
(2007)
The cratonic blocks of South America have been accreted from 2.2 to 1.9 Ga, and all of these blocks have been previously involved in the assembly and breakup of the Paleoproterozoic Atlantica, the Mesoproterozoic to ...
EVOLUTION OF THE ARCHEAN-EARLY PROTEROZOIC TRANSITION IN THE UNITED STATESEVOLUTION OF THE ARCHEAN-EARLY PROTEROZOIC TRANSITION IN THE UNITED STATES
(Sociedade Brasileira de Geologia, 2018)
Proterozoic-Paleozoic development of the basement of the Central Andes (18-26°S) - A mobile belt of the South American craton
(Pergamon-Elsevier Science Ltd, 2000-12)
The Late Precambrian-Early Paleozoic metamorphic basement forms a volumetrically important part of the Andean crust. We investigated its evolution in order to subdivide the area between 18 and 26°S into crustal domains by ...
Late Proterozoic unconformity-related hydrothermal iron deposits in the northern Barker area (Tandilia ranges, Argentina)
(E Schweizerbartsche Verlags, 2007-12-29)
New outcrops of hydrothermal clay alterations, associated with the Late Proterozoic unconformity between the migmatitic basement and sedimentary quartzitic sandstone sequence, were found near small iron (goethite and ...
The basement of the Deseado Massif at Bahı́a Laura, Patagonia, Argentina: a proposal for its evolution
(Pergamon-Elsevier Science Ltd, 2004-04)
The Rı́o Deseado Complex, the basement of the eastern Deseado Massif geological province of Argentina, is composed of five dispersed, small outcrops of upper Proterozoic–lower Paleozoic metamorphic and igneous rocks. We ...
Sm-Nd system in total rock open versus closed isotopic composition in zones of high deformation
(2002-12-01)
High strain shear zones of Brasiliano age, developed in Paleoproterozoic basement gneiss of the Caicó region, Borborema Province, NE Brazil, were associated with medium- to low-grade metamorphism and deformational processes ...
THE ORÓS BELT AGE: PRELIMINARY DATAA IDADE DA FAIXA ORÓS: DADOS PRELIMINARES
(Sociedade Brasileira de Geologia, 2017)
Detrital zircons from late Paleozoic accretionary complexes in north-central Chile (28°-32°S): Possible fingerprints of the Chilenia terrane
(Pergamon-Elsevier Science Ltd, 2011-05)
During the Paleozoic the Andean basement of central Chile and Argentina grew westwards by the amalgamation of diverse tectonostratigraphic terranes some of them derived from Laurentia. The last to be accreted, in the ...