Results 41 to 50 of about 62,283 (208)

Ediacaran Thermal Disturbance in the NW Amazonian Craton: Insights from Zircon and Apatite U–Pb Geochronology of the Guaviare Complex, Colombia

Geosciences
The northwestern Amazonian Craton exposed in eastern Colombia preserves a complex Proterozoic tectonothermal history. In this study, we present new zircon and apatite U–Pb geochronological data from orthogneisses of the Guaviare Complex (Termales Gneiss ...
Amed Bonilla Pérez, Nathan Cogné, Carlos Alfonso Zafra Mejía   +2 more
doaj   +1 more source

Contribution to the understanding of the Rondonia Tin Province granites (SW Amazonian Craton) origin using U-Pb and Lu-Hf in zircon by LA-ICP-MS: implications to A-type granite genesis

Journal of the Geological Survey of Brazil, 2019
The study of granite rocks is important in order to understand chemical evolution of the continental crust. Their isotopic composition provides information on their magmatic sources, whether being mantle, crust or a mixture of both.
Beatriz Pereira Debowski, Marcio Inacio Alves, Anderson Costa Santos, Armando Dias Tavares Jr., Mauro Cesar Geraldes   +4 more
doaj   +1 more source

Linear Water Erosion in the State of Mato Grosso (Brazil): Spatial Analysis and Identification of Critical Areas

Earth Surface Processes and Landforms, Volume 51, Issue 9, September 2026.
Mapping linear water erosion across Mato Grosso revealed spatially concentrated critical areas rather than a uniform distribution. Erosion foci were more frequent in environmentally fragile landscapes and areas of land‐use conflict, highlighting where monitoring and soil‐conservation actions should be prioritized.
Kássio Samay Ribeiro Tavares, Grace Bungenstab Alves, Selma Simões De Castro   +2 more
wiley   +1 more source

The NW Amazonian Craton in Guainia and Vaupes departments, Colombia : transition between orogenic to anorogenic environments during the Paleo-Mesoproterozoic

, 2021
In order to improve our understanding of the NW-Amazonian Craton evolution, we present new petrographic, geochemical and geochronological analyses of 27 samples from the geotectonic Rio Negro-Juruena Province in eastern Colombia (Guainia and Vaupes ...
Alessio, Brandon, Kroonenberg, Salomon, Cramer, Thomas, Glorie, Stijn, De Grave, Johan, Bonilla, Amed, De Grave, JohanWE138010013111730000-0003-0425-625XF59A4EAA-F0ED-11E1-A9DE-61C894A0A6B4   +6 more
core   +1 more source

The Encantada Granite: registration of a peraluminous intrusion in the Rondonian Province - San Ignacio, in SW Amazonic Craton, Mato Grosso, Brazil [PDF]

Geologia USP. Série Científica, 2015
The Encantada Granite occurs on the extreme southwest of the state of Mato Grosso, SW of the Amazonian Craton, near the border of Brasil/Bolívia. It corresponds to an body oriented to NNW direction that intruded metasedimentary and metavolcanic rocks ...
Brena Verginassi do Nascimento, Carlos Humberto da Silva, Ana Cláudia Dantas da Costa   +2 more
doaj   +1 more source

Insights on the framework of the Carajás Province, Amazonian Craton, Brazil, and on the three-dimensional shape of the Carajás Basin, based on gravity data

Journal of the Geological Survey of Brazil, 2019
This work interprets and models aerogravity data surveyed in the Carajás Province (also Carajás Domain) - Eastern Amazonian Craton, with the purpose of understanding the deep tectonic framework of this region and sketching the three-dimensional shape of ...
Roberto Gusmão de Oliveira
doaj   +1 more source

Morphological and compositional study of quartz and cassiterite of the Mocambo Granite, South Pará Tin Province, Amazonian Craton

Brazilian Journal of Geology, 2020
Quartz and cassiterite crystals of granite, greisens, and quartz veins from Mocambo Granite, Carajás Province, were studied by scanning electron microscopy — cathodoluminescence and electron microprobe. Five types of quartz were identified: Qz1, magmatic
Rubem Santa Brígida Barros Neto, Claudio Nery Lamarão, Gisele Tavares Marques, Cristina Valle Pinto-Coelho   +3 more
doaj   +1 more source

Groundwater Connectivity and Buffering in Western Australian Hypersaline Lakes: Implications for Late‐Stage Martian Lacustrine Systems

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract Thousands of saline to hypersaline lakes exist across the Yilgarn Craton in Western Australia, representing potential Mars analogs with diverse and varying salinity, pH, and oxygen conditions that remain poorly constrained. Here, we report geochemical trends in lake waters that vary across wet‐dry cycles as well as with regional location and ...
T. A. Plattner, B. E. Schmidt, N. M. Fernandez, P. T. Doran, M. A. Birmingham, J. M. Weber, A. Celestian, E. D. Ingall, J. S. Bowman, S. M. Som, A. Odenheimer, T. Bornholdt, C. Sephus, H. T. Jamison, K. Russo, S. Buessecker, L. A. Fisher, B. Klempay, E. R. Paris, E. J. Skoog, M. M. Weng, C. Pozarycki, A. T. Schartup, C. E. Carr, J. J. Wray, F. Rivera‐Hernández, E. Quartini   +26 more
wiley   +1 more source

Origin and evolution of the Amazonian craton [PDF]

, 1986
The Amazonian craton appears to be formed and modifed by processes much like those of the better-known Precambrian cratons, but the major events did not always follow conventional sequences nor did they occur synchronously with those of other cratons ...
Wirth, K. R., Gibbs, A. K.
core  

Araguainha Dome, Brazil: A polygonal impact structure due to a complex pre‐impact regional structural framework

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1355-1385, July 2026.
Abstract We investigated the structural framework of the north–northwestern Paraná Basin in Brazil to test whether the pre‐impact structures in this region may have had any influence on the first‐order formation and morphostructure of the Araguainha impact structure (AIS).
Renato B. Bernardes, Wolf U. Reimold, Roger L. Gibson, Julia B. Curto Ma, Adolfo B. Silva, Natalia Hauser   +5 more
wiley   +1 more source