[an error occurred while processing this directive] Global Geology 2018, 21(4) 209-220 DOI:   10.3969/j.issn.1673-9736.2018.04.01  ISSN: 1673-9736 CN: 22-1371/P
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Middle Triassic
petrogenesis
tectonic setting
granodiorite
Xiarihamu Ni-Cu mining area
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PubMed
Zircon U-Pb geochronology, geochemistry and geological significance of Xiarihamu granodiorite in Eastern Kunlun orogenic belt, Qinghai
YANG Baorong, MA Zhongxian, ZHANG Libin, WANG Xiaoyun, YAN Zhengping
Qinghai Provincial Bureau of Nonferrous Metaland Geological Exploration, Xining 810001, China
ժҪ�� Zircon U-Pb geochronology and geochemistry of the granodiorites in Xiarihamu Cu-Ni mining area are studied to determine the formation age, genesis and tectonic setting. The results show that the granodiorites formed in the Middle Triassic with weighted average age of 242±1 Ma. The granodiorites comprise of SiO2 of 61.34%-62.54%, Al2O3 of 16.46%-16.87%, MgO of 2.37%-2.66%, (Na2O+K2O) of 5.39%-5.74% with the Na2O/K2O of 1.46-1.88, Mg# of 47.03-48.04, and show metaluminous characteristics with A/CNK of 0.94-0.96, belonging to calc-alkaline I-type granites geochemically. The light and heavy rare earth elements in the rocks are distinctly fractionated and have "right-inclined" distribution patterns with weak negative Eu anomalies (δEu=0.84-0.91). Moreover, these samples show enrichments in LILEs (e.g., Rb, Ba, K and Sr), especially in Sr[(343-452)×10-6], and obvious depletions in HFSEs (e.g., Nb, Ta, Ti and P), indicating geochemical characteristics similar to subduction-related magmatic rocks. According to the regional tectonic evolution, the Xiarihamu granodiorites were emplaced under an Andean-type active continental margin environment in the early Indosinian, possessing a crust-mantle mixing origin.
�ؼ����� Middle Triassic   petrogenesis   tectonic setting   granodiorite   Xiarihamu Ni-Cu mining area  
Zircon U-Pb geochronology, geochemistry and geological significance of Xiarihamu granodiorite in Eastern Kunlun orogenic belt, Qinghai
YANG Baorong, MA Zhongxian, ZHANG Libin, WANG Xiaoyun, YAN Zhengping
Qinghai Provincial Bureau of Nonferrous Metaland Geological Exploration, Xining 810001, China
Abstract: Zircon U-Pb geochronology and geochemistry of the granodiorites in Xiarihamu Cu-Ni mining area are studied to determine the formation age, genesis and tectonic setting. The results show that the granodiorites formed in the Middle Triassic with weighted average age of 242±1 Ma. The granodiorites comprise of SiO2 of 61.34%-62.54%, Al2O3 of 16.46%-16.87%, MgO of 2.37%-2.66%, (Na2O+K2O) of 5.39%-5.74% with the Na2O/K2O of 1.46-1.88, Mg# of 47.03-48.04, and show metaluminous characteristics with A/CNK of 0.94-0.96, belonging to calc-alkaline I-type granites geochemically. The light and heavy rare earth elements in the rocks are distinctly fractionated and have "right-inclined" distribution patterns with weak negative Eu anomalies (δEu=0.84-0.91). Moreover, these samples show enrichments in LILEs (e.g., Rb, Ba, K and Sr), especially in Sr[(343-452)×10-6], and obvious depletions in HFSEs (e.g., Nb, Ta, Ti and P), indicating geochemical characteristics similar to subduction-related magmatic rocks. According to the regional tectonic evolution, the Xiarihamu granodiorites were emplaced under an Andean-type active continental margin environment in the early Indosinian, possessing a crust-mantle mixing origin.
Keywords: Middle Triassic   petrogenesis   tectonic setting   granodiorite   Xiarihamu Ni-Cu mining area  
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DOI: 10.3969/j.issn.1673-9736.2018.04.01
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Supported by Project of Qinghai Bureau of Geological Survey, 2017.

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