Results 11 to 20 of about 74,970 (357)

Detrital zircons U–Pb SHRIMP ages and provenance of La Modesta Formation, Patagonia Argentina

Journal of South American Earth Sciences, 2013
Abstract This paper summarizes the geology of the Paleozoic La Modesta Formation in Patagonia, Argentina, and presents new SHRIMP U–Pb dating of detrital zircons from muscovite-chlorite schist and tourmalinite. Also complementary geochemical and lead isotopic data are presented, indicating that the protoliths were formed from upper crustal rocks by ...
Moreira, Pilar, Fernández, Raúl, Hervé Allamand, Francisco, Fanning, C. Mark, Schalamuk, Isidoro A.   +4 more
openaire   +6 more sources

SHRIMP zircon U–Pb ages from coal beds across the Permian–Triassic boundary, eastern Yunnan, southwestern China [PDF]

Journal of Palaeogeography, 2018
The first SHRIMP zircon U–Pb ages from coal beds close to the end-Permian mass extinction are reported from the C1 coal seam in the Yantang Mine in Laibin Town, Xuanwei County, eastern Yunnan Province.
Juan Wang, Long-Yi Shao, Hao Wang, Baruch Spiro, David Large   +4 more
doaj   +2 more sources

SHRIMP zircon U–Pb age constraints on Neoproterozoic Quruqtagh diamictites in NW China [PDF]

Precambrian Research, 2009
Abstract The Neoproterozoic Quruqtagh Group in the Tarim Block, NW China, contains multiple diamictites in the Bayisi, Altungol, Tereeken, and Hankalchough formations. These diamictites may represent three or possibly four discrete glaciations, although evidence for a glacial origin of the Bayisi and Altungol diamictite is ambiguous.
Xu, Bei, Xiao, Shuhai, Zou, Haibo, Chen, Yan, Li, Zheng-Xiang, Song, Biao, Liu, Dunyi, Zhou, Chuanming, Yuan, Xunlai   +8 more
openaire   +5 more sources

Geoquímica e geocronologia dos Gnaisses Piratini: magmatismo cálcio-alcalino médio a alto-K de 784 Ma (U-Pb SHRIMP) no SE do Cinturão Dom Feliciano (RS, Brasil)

Pesquisas em Geociências, 2019
Diversas ocorrências de xenólitos metamórficos em granitoides neoproterozoicos são reconhecidas no Domínio Oriental do Cinturão Dom Feliciano (Rio Grande do Sul, Brasil).
Guilherme Baldissera Tambara, Edinei Koester, Rodrigo Chaves Ramos, C. C. Porcher, Daniel Triboli Vieira, L. Fernandes, Cristine Lenz   +6 more
semanticscholar   +1 more source

P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION

Геодинамика и тектонофизика, 2021
The study is focused on metapelitic granulites of Cape Kaltygei (Western Baikal region) that contain a diagnostic mineral assemblage of ultrahigh temperature (UHT) metamorphic rocks (orthopyroxene+sillimanite+quartz).
N. I. Volkova, E. I. Mikheev, A. V. Travin, A. G. Vladimirov, A. S. Mekhonoshin, V. V. Khlestov   +5 more
doaj   +1 more source

Zircon SHRIMP U-Pb dating of the Neogene coral reefs, Xisha Islands, South China Sea: implications for tectonic evolution

China Geology, 2018
: The Xisha Block is a minor one in the South China Sea and an important tectonic unit in the northwestern part of the region. Zircon SHRIMP U-Pb ages for three volcanic intrusive core samples from Xike-1, an exploratory well penetrating the bioherms of ...
Hong Xu, Zhao-peng Ji, Shan-ying Li, Yan-qiou Yang, Shou-jie Liu, Hai-yang Zhang, Shu-shen Lu, Tong-qiang Shi, Meng Tao, Na Qin, Wei-wei Zhang, Da-peng Su, Long-wei Qiu   +12 more
doaj   +1 more source

U-Pb geochronology of the Fort Augustus granite gneiss: constraints on the timing of Neoproterozoic and Palaeozoic tectonothermal events in the NW Highlands of Scotland [PDF]

, 2001
The West Highland granite gneiss suite in Inverness-shire, Scotland, represents a series of S-type, anatectic granites formed by partial melting of host Neoproterozoic metasediments of the Moine Supergroup.
Kinny, P.D., Strachan, R.A., P. D. KINNY, Strachan, RA, Paterson, BA, Friend, C.R.L., Paterson, B.A., Kinny, PD, Rogerson, G., C. R. L. FRIEND, Rogers, G, G. ROGERS, Friend, CRL, R. A. STRACHAN, B. A. PATERSON   +14 more
core   +1 more source

Granito Aragão — Suíte intrusiva Nhandú — um granito oxidado, tipo A2, de 1967 a 1964 Ma na Província Aurífera Alta Floresta — Cráton Amazônico

Geologia USP. Série Científica, 2018
O Granito Aragão, localizado na Província Aurífera Alta Floresta (PAAF), consiste de um stock granítico de ~ 80 km2, de granulação média a grossa, textura porfirítica e composição modal monzogranítica a sienogranítica.
Samantha Evelyn Max Dezula, Marcia Aparecida Sant’Ana Barros, Ronaldo Pierosan, João Orestes Schneider Santos, Rafael Rodrigues Assis   +4 more
doaj   +1 more source

From subduction to collision in the northern Tibetan plateau : evidence from the early Silurian clastic rocks, northwestern China [PDF]

, 2012
The Qilian Orogen records early Paleozoic collisional suturing of the Qaidam Block and the Central Qilian Block to the North China Craton. The composition and U-Pb age of detrital zircons and the composition of Cr-spinels from the Early Silurian ...
Jianghai Yang, Peter A. Cawood, Yuansheng Du, Yajun Xu, Yang, Jianghai, Xu, Yajun, Cawood, Peter A., Du, Yuansheng   +7 more
core   +1 more source

SHRIMP Zircon U-Pb Dating of Mid-Pleistocene Dacite and Discussion of Relative Problems

Yankuang ceshi, 2015
K-Ar and U series disequilibria methods have been applied to geochronology research of young volcanic rocks in Tengchong, China. Previous K-Ar dating methods yielded ages of 0.013 to 17.84 Ma and isochron ages of 0.13 to 2.9 Ma in this area. The U series
LI Lin-lin, WANG Shu-bing, SHI Yu-ruo
doaj   +1 more source