Metallogenesis of the Late Palaeozoic Axi-Tawuerbieke Au-Pb-Zn district in the Tulasu Basin, Western Tianshan, China: Constraints from geological characteristics and isotope geochemistry

2018 ◽  
Vol 53 (6) ◽  
pp. 3030-3050 ◽  
Author(s):  
Yi-Wei Peng ◽  
Xue-Xiang Gu ◽  
Wen-Bin Cheng ◽  
Xiao-Bo Zhao ◽  
Guan-Nan Wang ◽  
...  
Keyword(s):  
Isotope Geochemistry ◽  
Geological Characteristics ◽  
Late Palaeozoic ◽  
Western Tianshan

Bimodal magmatism produced by delamination: geochemical evidence from late Palaeozoic volcanic rocks from the Yili Block, Western Tianshan, Northwestern China

2020 ◽  
pp. 1-15
Author(s):  
Genwen Chen ◽  
Rui Liu ◽  
Teng Deng ◽  
Lixing Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Volcanic Rocks ◽  
Orogenic Belt ◽  
Late Carboniferous ◽  
Early Permian ◽  
Asthenospheric Mantle ◽  
Late Palaeozoic ◽  
Depleted Mantle ◽  
Western Tianshan

Abstract The Western Tianshan orogenic belt is essential for understanding the evolution of the Central Asian orogenic belt. However, no agreement exists among geologists about its tectonic environment during the Late Palaeozoic. The volcanic rocks of the Yishijilike and Wulang Formation in the Yili Block, Western Tianshan, formed in the Late Carboniferous to Early Permian, mainly consist of a bimodal suite of basalts – basaltic andesites and rhyolites, with only some intermediate rocks. Mafic rocks are slightly enriched in light rare earth elements (LREE) and depleted in Nb, Ta, Zr and Hf, suggesting a subduction-modified depleted mantle source. Some mafic samples in the Early Permian bimodal volcanic rocks have high Ti contents with relatively high concentrations of Nb and high field strength elements (HFSE) and low contents of heavy rare earth elements (HREE). These rocks are similar to the continental flood basalts, which suggests that they formed from an asthenospheric mantle. This paper indicates that mafic members were created by the partial melting of the asthenospheric mantle material and subduction-modified lithospheric mantle mixture. Some rhyolites and dacites in the Wulang formation were enriched in Ga, Nb, Zr, Ce and Y and depleted in Sr and Eu. Additionally, they showed fractionation of rare earth elements (REE) with negative Eu anomalies, which is indicative of an A-type affinity of felsic rocks. The genesis of mafic members and an A-type affinity of felsic members indicate that the Late Carboniferous – Early Permian magmatism in the Western Tianshan area formed as a result of an extensional setting. This study also reveals bimodal magmatism produced by delamination in an extensional tectonic setting.

Geological characteristics, deposit type, and metallogenic epoch of the Katebasu gold-copper deposit in western Tianshan

2017 ◽  
Vol 53 ◽  
pp. 263-277 ◽  
Author(s):  
Yunhua Liu ◽  
Yixiao Han ◽  
Zhen Li ◽  
Xuanxue Mo ◽  
Yu Huang ◽  
...  
Keyword(s):  
Copper Deposit ◽  
Geological Characteristics ◽  
Western Tianshan ◽  
Deposit Type ◽  
Metallogenic Epoch

Geological characteristics and metallogenesis of iron deposits in western Tianshan, China

2014 ◽  
Vol 57 ◽  
pp. 425-440 ◽  
Author(s):  
Zuoheng Zhang ◽  
Wei Hong ◽  
Zongsheng Jiang ◽  
Shigang Duan ◽  
Fengming Li ◽  
...  
Keyword(s):  
Geological Characteristics ◽  
Western Tianshan ◽  
Iron Deposits

The first results of isotopic (U-Pb, ID-TIMS) dating of individual zircon grains from dolerite dikes of the Eastern zone of the Urals

LITOSFERA ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 224-230
Author(s):  
V. N. Smirnov ◽  
K. S. Ivanov ◽  
T. V. Bayanova
Keyword(s):  
Isotope Geochemistry ◽  
Early Carboniferous ◽  
Dynamic Mode ◽  
Middle Urals ◽  
Volcanic Complex ◽  
The Urals ◽  
Electron Multiplier ◽  
The Middle Urals ◽  
Eastern Zone ◽  
First Results

Research subject. The article presents the results of dating two dolerite dikes differing in geochemical features from a section along the Iset river in the area of Smolinskoe settlement (the Eastern zone of the Middle Urals). Materials and methods. The dating was performed by an U-Pb ID-TIMS technique for single zircon grains using an artificial 205Pb/235U tracer in the laboratory of geochronology and isotope geochemistry of the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences. The lead isotopic composition and uranium and lead concentrations were measured using a Finnigan-MAT (RPQ) seven-channel mass spectrometer in dynamic mode using a secondary electron multiplier and RPQ quadrupole in ion counting mode. Results. The dikes were dated 330 ± 3 Ma and 240 ± 2 Ma. Conclusions. The research results indicate different ages of dolerite dikes developed within the Eastern zone of the Middle Urals. The oldest of the two established age levels corresponds to the Early Carboniferous era. This fact, along with the proximity of the dolerites to the petrochemical features of the basaltoids of the Early Carboniferous Beklenischevsky volcanic complex, allows these bodies to be considered as hypabyssal comagmates of these volcanics. The youngest obtained age level – Triassic – indicates that the introduction of some dolerite dikes was associated with the final phases of the trapp formation developed rarely within the eastern outskirts of the Urals and widely further east in the foundation (pre-Jurassic basement) of the West-Siberian Plate.

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