|
|
|
|
|
Ruy Paulo Philipp, Ubiratan Ferrucio Faccini, Cesar Leandro Schultz, Gustavo Zvirtes, Matheus Philippe Bruckmann, Ernesto Lavina, Joice Cagliari, Andrea Ritter Jelinek, Renata Guimarães Netto, Adriano Roessler Viana and Miguel Angelo Stipp Basei
Zircon U-Pb geochronology was applied to investigate the provenance, depositional ages, and paleogeography of the southwestern Gondwana in detrital and ash fall sediments from Carboniferous to Jurassic succession of the southern Paraná Basin. Four detrit...
ver más
|
|
|
|
|
|
|
|
|
|
|
Desmond F. Lascelles and Ryan J. Lowe
Large blocks and boulders of banded iron formations and massive hematite up to 40 × 27 × 6 m3 and in excess of 10,000 metric tonnes were detached from an outcrop of the Wilgie Mia Formation during the ca 2.20 Ga marine transgression at the base of the Pa...
ver más
|
|
|
|
|
|
|
|
|
|
|
Leda Sanchez Bettucci,Umberto Giuseppe Cordani,Judith Loureiro,Elena Peel,Santiago Fort,Kei Sato
Pág. 442 - 471
A U-Pb SHRIMP zircon geochronological study was carried out in the Nico Pérez Terrane in the central-eastern portion of Uruguay with the aim of constraining its geological evolution and its cratonic affinity. Nico Pérez Terrane is made up by a mosaic of ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Frédéric-Victor Donzé, Laurent Truche, Parisa Shekari Namin, Nicolas Lefeuvre and Elena F. Bazarkina
Hydrogen gas is seeping from the sedimentary basin of São Franciso, Brazil. The seepages of H2 are accompanied by helium, whose isotopes reveal a strong crustal signature. Geophysical data indicates that this intra-cratonic basin is characterized by (i) ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Henrik Drake, Ellen Kooijman and Melanie Kielman-Schmitt
The strontium isotope signature (87Sr/86Sr) of calcite precipitated in rock fractures and faults is a frequently used tool to trace paleofluid flow. However, bedrock fracture networks, such as in Precambrian cratons, have often undergone multiple fractur...
ver más
|
|
|
|
|
|
|
|
|
|
|
Gabriel A. Arcuri and Alan P. Dickin
New whole-rock lead (Pb) isotope analyses are presented in this study for granitoid orthogneisses from the Southwest Grenville Province in Ontario and Western Quebec. These data are used to test the location of a cryptic Archean-Proterozoic suture propos...
ver más
|
|
|
|
|
|
|
|
|
|
|
Xuejia Sang, Linfu Xue, Jiwen Liu and Liang Zhan
Geological faults are highly developed in the eastern Liaoning Province in China, where Mesozoic granitic intrusions and Archean and Paleoproterozoic metamorphic rocks are widely distributed. Although the heat flow value in eastern Liaoning Province is g...
ver más
|
|
|
|
|
|
|
|
|
|
|
J. Katupotha
In the Earth?s history, there were five major glaciations, namely, Huronian (2,300 Ma),Cryogenianor Sturtian-Varangian(850-635 Ma), Andean-Saharan (460-430 Ma, Karoo (360-260 Ma) andthe Quaternary (2.58 Ma to Present) that occurred between 2,300 Ma and 0...
ver más
|
|
|
|
|
|