Major element geochemistry and genesis of Yanshanian mineralized granites in the polymetallic deposit concentration region, southern Hunan
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    Abstract:

    Abstract:There are three types of Yanshanian mineralized granite distributed in Hunan. Major element geochemical analyses show the following:(1) Mineralized granites have a higher ratio of K2O/Na2O and display the features of the high-K, calc-alkaline shoshonite series. (2)The MC-type and early CM-type granites are poor in Si and alkalis (K+Na) and rich in Ca, Mg and Fe with a lower aluminum index (A/KNC) and a lower alkalinity ratio of KN/A, which indicates that those granites have the same characteristics as magnesian and ferruginous, para-aluminous, high-K calc-alkaline rocks, such as I-type granite. The lC-type and late CM-type granites are relatively rich in Si and alkalis and poor in Ca and Mg, belonging to the ferruginous, slightly peraluminous-peraluminous shoshonite series. Their ratios of FeOT/MgO are notably higher than those of I- and M-type granites and their higher FeOT values indicate that these granites are apparently distinguished from highly differentiated I-type granites, but generally, they show the features of S-type granites. (3)The higher percentages of F and Cl in mineralized granites indicate that the magma of Yanshanian mineralized granites evolved toward the peraluminous or peralkaline one. The increase in concentrations of the HFSE in the late-stage magma led to mineralization of multiple metals such as Cu, Pb, Zn and Sb in the early-stage MC- and CM-type granites and large-scale mineralization of Sn, W, Pb, Zn, Nb, Ta and LREE in the late-stage aluminous C-type and CM-type granites. (4)The formation of the mineralized granites is related with crust-mantle magma intermingling. The magma generating the MC-type and early-stage CM-type granites was sourced from magma intermingling, while the magmatic evolution of C-type and late-stage CM-type granites might also involve fractional crystallization.

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WU Guang-ying, XIAO Xu-chang, XIAO Qing-hui, WANG Tao, YAN Quan-ren, CHEN Hui-ming, MA Tie-qiu, BO Dao-yuan. Major element geochemistry and genesis of Yanshanian mineralized granites in the polymetallic deposit concentration region, southern Hunan[J]. Geology in China, 2008, 35(2): 217-231(in Chinese with English abstract).

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  • Online: April 02,2013
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