Sequence paleogeography and coal accumulation of the Early–Middle Jurassic in central Qilian Mountain belt (Muli Basin), Qinghai Province, northwestern China

AAPG Bulletin ◽  
2018 ◽  
Vol 102 (09) ◽  
pp. 1739-1762 ◽  
Author(s):  
Xiaoxu Shang ◽  
Longyi Shao ◽  
Wenlong Zhang ◽  
Jinggao Lv ◽  
Weichao Wang ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Northwestern China ◽  
Qilian Mountain ◽  
Qinghai Province ◽  
Mountain Belt ◽  
Coal Accumulation

scholarly journals Sedimentary Facies and Coal-Accumulation of the Early-Middle Jurassic in Toksun Coalfield Northwestern China

2013 ◽  
Vol 31 (3) ◽  
pp. 459-470 ◽  
Author(s):  
Lin Xiao ◽  
Cunliang Zhao ◽  
Shuheng Tang ◽  
Zhanyong Liu ◽  
Wen Yang ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Sedimentary Facies ◽  
Northwestern China ◽  
Coal Accumulation

Geochemistry, zircon geochronology, and isotopic systematics of the Zhanbuzhale granites in the East Kunlun, Qinghai Province, northwestern China: implications for the tectonic setting

2020 ◽  
Vol 57 (2) ◽  
pp. 275-291
Author(s):  
Hao-Ran Li ◽  
Ye Qian ◽  
Feng-Yue Sun ◽  
Liang Li
Keyword(s):  
Tectonic Setting ◽  
Alkali Feldspar ◽  
Northwestern China ◽  
Geochemical Data ◽  
Calc Alkaline ◽  
Qinghai Province ◽  
East Kunlun ◽  
Initial Stage ◽  
High K ◽  
Tethys Ocean

The Zhanbuzhale region, in the Eastern Kunlun Orogen of northwestern China, is characterized by large volumes of Phanerozoic granitoid rocks and is an ideal region for investigating the tectonic evolution of the Paleo-Tethys system. However, the exact timing of the final closure of the Paleo-Tethys Ocean and initial continental collision remains controversial because of a lack of precise geochronological and detailed geochemical data. In this paper, we report new zircon U–Pb ages and mineralogical, petrographic, and geochemical data for samples of Middle Triassic granodiorite and alkali feldspar granite from the Zhanbuzhale region. The zircon U–Pb ages indicate that the granodiorite and alkali feldspar granite formed at 239 and 236 Ma, respectively. The granodiorites are high-K calc-alkaline, metaluminous, high Sr content, high Sr/Y ratios, low Y content, and show adakite-like affinities. The alkali feldspar granites display high SiO2, extremely low MgO, and low Zr+Nb+Ce+Y contents as well as low Fe2O3t/MgO ratios, showing metaluminous to peraluminous and high-K calc-alkaline features. Geochemical and petrological characteristics of the alkali feldspar granites suggest that they are highly fractionated I-type granites. The granodiorites and alkali feldspar granites have zircon εHf(t) values ranging from –2.26 to –0.18, and from –2.17 to +2.18, respectively. Together with regional geological data, we propose that the Triassic (approximately 239–236 Ma) granitoids were generated during the later stages of northward subduction of the Paleo-Tethys oceanic plate, and that the initial stage of collision between the East Kunlun and the Bayan Har–Songpan Ganzi terrane occurred at approximately 236–227 Ma.

scholarly journals First genotyping of Blastocystis in yaks from Qinghai Province, northwestern China

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Mei Ren ◽  
Jun-ke Song ◽  
Fan Yang ◽  
Min Zou ◽  
Pin-xue Wang ◽  
...  
Keyword(s):  
Northwestern China ◽  
Qinghai Province

Paleoenvironments and paleogeography of the Lower and lower Middle Jurassic coal measures in the Turpan-Hami oil-prone coal basin, northwestern China

AAPG Bulletin ◽  
2003 ◽  
Vol 87 (2) ◽  
pp. 335-355 ◽  
Author(s):  
Longyi Shao ◽  
Pengfei Zhang ◽  
Jason Hilton ◽  
Rod Gayer ◽  
Yanbin Wang ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Northwestern China ◽  
Coal Basin ◽  
Jurassic Coal ◽  
Coal Measures

An endemic brackish water faunule from the middle jurassic of southern qinghai province, China

PalZ ◽  
1991 ◽  
Vol 65 (1-2) ◽  
pp. 105-117 ◽  
Author(s):  
Jiarun Yin ◽  
Franz T. Fürsich
Keyword(s):  
Brackish Water ◽  
Middle Jurassic ◽  
Qinghai Province
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