scholarly journals First Reliable Re-Os Ages of Pyrite and Stable Isotope Compositions of Fe(-Cu) Deposits in the Hami Region, Eastern Tianshan Orogenic Belt, NW China

2013 ◽  
Vol 63 (2) ◽  
pp. 166-187 ◽  
Author(s):  
Xiao-Wen Huang ◽  
Liang Qi ◽  
Jian-Feng Gao ◽  
Mei-Fu Zhou
Keyword(s):  
Stable Isotope ◽  
Orogenic Belt ◽  
Eastern Tianshan ◽  
Nw China ◽  
Tianshan Orogenic Belt

scholarly journals Petrogenesis and Tectonic Significance of the ~276 Ma Baixintan Ni-Cu Ore-Bearing Mafic-Ultramafic Intrusion in the Eastern Tianshan Orogenic Belt, NW China

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 348
Author(s):  
Minxin You ◽  
Wenyuan Li ◽  
Houmin Li ◽  
Zhaowei Zhang ◽  
Xin Li
Keyword(s):  
Orogenic Belt ◽  
Olivine Gabbro ◽  
Early Permian ◽  
Eastern Tianshan ◽  
Nw China ◽  
Tianshan Orogenic Belt ◽  
Tectonic Significance ◽  
Ultramafic Intrusion ◽  
Back Arc ◽  
Duke Island

The Baixintan mafic-ultramafic intrusion in the Dananhu-Tousuquan arc of the Eastern Tianshan orogenic belt is composed of lherzolite, olivine gabbro, and gabbro. Olivine gabbros contain zircon grains with a U-Pb age of 276.8 ± 1.1 Ma, similar to the ages of other Early Permian Ni-Cu ore-bearing intrusions in the region. The alkaline-silica diagrams, AFM diagram, together with the Ni/Cu-Pd/Ir diagram, indicate that the parental magmas for the Baixintan intrusion were likely high-Mg tholeiitic basaltic in composition. The Cu/Pd ratios, the relatively depleted PGEs and the correlations between them demonstrate that the parental magmas had already experienced sulfide segregation. The lower CaO content in pyroxenites compared with the Duke Island Alaskan-type intrusion and the composition of spinels imply that Baixintan is not an Alaskan-type intrusion. By comparing the Baixintan intrusion with other specific mafic-ultramafic intrusions, this paper considers that the mantle source of the Baixintan intrusion is metasomatized by subduction slab-derived fluids’ components, which gives rise to the negative anomalies of Nb, Ti, and Ta elements. Nb/Yb-Th/Yb, Nb/Yb-TiO2/Yb, and ThN-NbN plots show that the Baixintan intrusion was emplaced in a back-arc spreading environment and may be related to a mantle plume.

Late Paleozoic metallogenesis and evolution of the East Tianshan Orogenic Belt (NW China, Central Asia Orogenic Belt)

2014 ◽  
Vol 56 (6) ◽  
pp. 493-512 ◽  
Author(s):  
Chunming Han ◽  
Wenjiao Xiao ◽  
Guochun Zhao ◽  
Benxun Su ◽  
Patrick Asamoah Sakyi ◽  
...  
Keyword(s):  
Central Asia ◽  
Orogenic Belt ◽  
Late Paleozoic ◽  
Nw China ◽  
Tianshan Orogenic Belt ◽  
East Tianshan
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