Results 71 to 80 of about 85,116 (273)

A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina)

Geosciences, 2023
The Yacoraite Fm. (Salta rift basin, Argentina) consists of a mixed carbonate–siliciclastic lacustrine succession, interbedded with volcanic ash layers and organised in four third-order stratigraphic sequences. It is one of the few sites in South America
Damaris Montano, Marta Gasparrini, Sébastien Rohais, Ramon De Luca   +3 more
doaj   +1 more source

Evidence From Microscopy and U–Pb Geochronology as a Clue to the Influence of the Cretaceous Magmatism in the Diagenesis of Pre‐Salt Carbonate Reservoirs in the Santos Basin (Brazil)

Geological Journal, EarlyView.
Carbonates from Santos Basin revealed U–Pb ages correlated with basalt ages (A), suggesting that they were formed during magmatic events. These events placed hot CO2 in the reservoir, which, when mixed with carbonate‐rich cold water (B), led to thermal convection, enabling the formation of the U contained in the carbonates.
Marco António Ruivo de Castro e Brito, Cristiano Leite Sombra, Davy Raeder Brandão, Cleverson Guizan Silva, Sidney Luiz de Matos Mello, Eugênio Vaz dos Santos Neto, Rui Jorge Fernandes Baptista, Ramsés Capilla, Luiz Antônio Pierantoni Gambôa   +8 more
wiley   +1 more source

U-Pb chronology of the Solar System's oldest solids with variable 238 U/ 235 U

, 2016
Accurate determination of the absolute ages of the oldest Solar System objects - chondrules and Ca-Al-rich inclusions (CAIs), requires knowledge of their 238U/235U ratios.
Amelin, Yuri, Iizuka, Tsuyoshi, Ireland, Trevor, Jacobsen, Stein, Kaltenbach, Angela, Petaev, Michail, Stirling, Claudine H   +6 more
core   +1 more source

El volcanismo jurásico superior de la Formación Río Damas-Tordillo (33°-35,5°S): antecedentes su sobre petrogénesis, cronología, proveniencia e implicancias tectónicas [PDF]

, 2014
Los depósitos continentales y volcánicos de la Formación Rio Damas-Tordillo, Jurásico Superior, representan un período restringido de sedimentación continental dentro del registro mayormente marino de la Cuenca Neuquina.
Calderón, Sergio, Charrier González, Reynaldo, Ducea, Mihai Nicolae, Hoffman, Derek, Mescua, Jose Francisco, Oliveros, Verónica, Rossel, Pablo, Tapia, Felipe   +7 more
core   +2 more sources

Mesozoic–Cenozoic Thermochronology of the Tarim–Southern Tianshan System, NW China

Geological Journal, EarlyView.
Tectonothermal history of the Tarim–Southern Tianshan system compared with the major tectonic events at far‐field plate margins. ABSTRACT The Tarim Basin, an oil‐bearing basin in northwest China, is tectonically and sedimentologically linked to the Southern Tianshan Orogenic Belt.
Shuangfeng Zhao, Wen Chen, Jingbo Sun, Ze Shen, Jie Zhang   +4 more
wiley   +1 more source

Zircon U–Pb Geochronology Applied to Tectonics and Ore Deposits

Geosciences
Zircon U–Pb geochronology has become one of the most fundamental and powerful tools in modern Earth and planetary sciences [...]
Khin Zaw, Charles Makoundi, Jillian Aira S. Gabo-Ratio   +2 more
doaj   +1 more source

Interpretation problems of LA-ICP-MS U-Pb geochronology

Review of the Bulgarian Geological Society, 2020
The existing practice for characterizing the time of a metamorphic event by the average mean of radiogenic mineral dates gives a false idea about the event duration. In the present communication this practice is discussed from the viewpoint of regional geology and geodynamics.
openaire   +1 more source

Thermochronologic Constraints on the Extensional History of the Ibex Hills, Southeastern Black Mountains, Death Valley, California

Geological Journal, EarlyView.
A. Modeled T‐t paths for samples in the northern Ibex Hills, showing steady cooling throughout much of the Cenozoic, until rapid Miocene cooling. B. Weighted mean paths for each sample in this study. Note that all show a rapid cooling event at or just after 10 Ma, which is interpreted to represent exhumation as a result of regional extenstion ...
Zachariah D. Fleming
wiley   +1 more source

Petrogenesis of the Cretaceous Intraplate Mafic Intrusions in the Eastern Tianshan Orogen, NW China

Frontiers in Earth Science, 2021
In this study, we conducted zircon U-Pb dating, and whole-rock geochemical and Sr-Nd isotope analyses on the Late Mesozoic dolerite dykes in the Bailingshan Fe deposit (Eastern Tianshan Orogen, NW China) to unravel their petrogenesis and regional ...
Weifeng Zhang, Weifeng Zhang, Xin Deng, Bing Tu, Lianhong Peng, Xinbiao Jin   +5 more
doaj   +1 more source

Early Cambrian U-Pb zircon age and Hf-isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc [PDF]

, 2016
An Early Cambrian pluton, known as the Guasayán pluton, has been identified in the central area of Sierra de Guasayán, northwestern Argentina. A U?Pb zircon Concordia age of 533 ± 4 Ma was obtained by LA-MC-ICP-MS and represents the first report of ...
Alasino, Pablo Horacio, Baldo, Edgardo Gaspar Agustín, Basei, Miguel A. S., da Costa Campos Neto, Mario, Dahlquist, Juan Andrés, Rapela, Carlos Washington, Uran, Gimena Mariel, Verdecchia, Sebastián Osvaldo, Zandomeni, Priscila Soledad   +8 more
core   +2 more sources