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LI Ruojian, CHEN Yuanrong, GU Ruiqi, LI Jiacai, JIANG Xin, NONG Yuejin, WANG Zhanyu, YAN Xiang. Geochemical characteristics and metallogenic potential of Maoershan granite and its adjacent basement strata in Guangxi[J]. GEOLOGY IN CHINA, 2020, 47(2): 528-537. DOI: 10.12029/gc20200218
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Through studying the geochemical characteristics and metallogenic potential of Maoershan granite and its adjacent basement strata, it is found that the granite is characterized by high silicon (SiO2=67.61%-8.316%), rich potassium (K2O=3.75%-6.28%) and iron (FeOT=1.85%-5.38%), depleted sodium (Na2O=0.08%-3.06%), poor magnesium (MgO=0.14%-1.28%), peraluminous nature (the average of A/CNK being 1.49), relatively high total amounts of rare earth elements, and enriched light rare earth elements, with Eu negative anomaly (δEu=0.15-0.46), suggesting that it was formed in the post-orogenic tectonic environment and belonged to strongly peraluminous S-type granite. At the same time, the results show that the element assemblages and hydrocarbon composition of Maoershan granite and its adjacent basement strata had inherited relationship. The granite was mainly derived from the partial melting of the basement strata. W, Sn and Bi had good metallogenic potential. All these data show that the basement strata in this area not only provided a material basis for large-scale magmatic activities but also provided a source of ore-forming materials for further differentiation of granite pulp to form tungsten-tin polymetallic deposits.
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