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Origin and geodynamic implications of concealed granite in Shadong tungsten deposit, Xinjiang China: zircon U-Pb chronology, geochemistry, and Sr-Nd-Hf isotopeconstraint

Chao Chen1, Xinbiao Lü1,2*,ChunMing Wu1, Xiao Jiang3, Chen Mao2
1.Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China;2. Faculty of Earth Resources, China University of Geosciences, Wuhan430074, China;3.No.6 Geological Survey Team,Bureau of Xinjiang GeologicalExploration, Hami839000, China

Shadong deposit is the first large-scaletungsten deposit found in East Tianshan Orogenic Belt, and the geologic characteristics of the deposit indicate that the deeply concealed granite bodyis genetically related with the mineralization. LA-ICPMS U-Pb age of zircons from the Shadong concealed granite obtained in this research is 239±2.0Ma, belonging to Middle Triassic. The whole rock samples are metaluminousto slightly peraluminous (A/CNK=0.95–1.02) with low contents of SiO2(64.0–68.5wt.%) and low K2O/Na2O ratios(0.73–0.96). The samples reveal enrichmentof K, Rb, Th and depletion of Nb, Ta, P ,Ti and have a negative slope from La to Lu (LaN/YbN=16.29–36.8)with weak negative Eu anomaly(Eu/Eu*= 0.71–0.82).Initial 87Sr/86Sr ratios of whole rock range from 0.70659–0.70775, εNd(t)values range from -1.77 to -2.53 and εHf(t)values of zircon are between 2.54 and 4.90. The lithogeochemistry and Sr-Nd-Hf isotopiccharacteristics revealed that the concealed granite in Shadong tungsten deposit belong to I-type granite, and occurred in anintraplate tectonic setting. The magma mixing during intraplating of mantle derived magma intruding into the crustin Indosinian periodis the major formation mechanism of the granite.Of which, the proportion of mantle derived magma range from58% to 60%, and thecrustalmaterials are mainly the metamorphic basement of Xingxingxia Group of MesoproterozoicChangcheng system, which may provide the main source of ore forming metals of Shadong tungsten deposit.

 

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Keywords:East Tianshan, Shadong tungsten deposit, Crust-mantle interaction,Zircon U-Pb chronology, lithogeochemistry, Sr-Nd-Hf isotope

DOI:
10.1007/s12583-017-0940-4
CLC number:
U469.72
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