Abstract
Major elements, trace elements and sulfur, oxygen isotopic compositions of the main intrusions were studied in Yueshan area. The fact that intrusions enriched in Th and Sr, and depleted in Rb and Ba in this area, suggests that the original magma roots in alkali basalt magma of upper mantle, with deep characteristics. It can be seen that the diagenesis environments are the island arc and active continental margin areas from the lg τ to lg σ diagram of intrusions. With the increase of SiO2, Fe2O3, MnO and P2O5 decrease, which shows that the magma of Yueshan area endured crystal fractionation of ferromanganese mineral and apatite in early evolution stage. With the further rise and evolution of magma, magma composition of calcium increased, meanwhile enriched in Zr, and depleted in Nb and Ta. This indicates that crustal component is gradually added, the assimilation and contamination occur between magma and crustal material, which includes the magma evolving, from calc-alkaline series to alkaline series. The results show that crystal fractionation, assimilation and contamination are the main evolution law of magma in this area.
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Foundation item: Project(2012zzts010) supported by the Fundamental Research Funds for the Central Universities, China; Project(20091100704) supported by the Special Funds for Scientific Research of Land and Natural Resources, China
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Liu, Zf., Shao, Yj., Zhang, Jd. et al. Magma source and evolution law in Yueshan ore field, Anhui Province, China. J. Cent. South Univ. 21, 1491–1498 (2014). https://doi.org/10.1007/s11771-014-2089-y
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DOI: https://doi.org/10.1007/s11771-014-2089-y