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• W2980366178 endingPage "103174" @default.
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• W2980366178 abstract "The effects of volatile concentrations and oxidation state of magma on the Mo mineralization potential have been explored through petrographic studies and in situ electron probe micro-analyzer (EPMA) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) of apatites from coeval economically Mo- mineralized granite porphyry and quartz diorite, and sub-economically mineralized granite porphyry at Luanchuan orecluster. The occurrence of abundant K-feldspar xenocrysts, possibly entrained from granitic magma, in quartz diorite implying a magma mingling process. Studied apatites are fluorapatites or fluor-hydroxyapatites with decreasing OH concentrations from economically mineralized quartz diorite (0.30–0.49 apfu) through mineralized granite porphyry (0.14–0.41 apfu) to sub-economically mineralized granite porphyry (0.01–0.11 apfu). Chondrite-normalized REE patterns of all the apatites are characterized by LREE enrichment relative to MREE and HREE, and negative Eu anomaly, similar to their host magmas, indicating a melt composition control. Strontium concentration of studied apatites are probably controlled by the crystallization of plagioclase or alkali feldspar. Mineralized quartz diorite formed at a relatively reduced environment compared to other rocks, but mineralized granite porphyry and sub-economically mineralized granite porphyry formed at a similar oxidation state, based on the SO3, Eu, Ce, and Mn content variation of apatites. The OH-contents of apatites, combined with published log (H2O/HF) ratios of melt in equilibrated with biotites, reflect that economically mineralized intrusions have higher water contents than the sub-economically mineralized intrusions. In a porphyry Mo system, a high magma water content is probably a key parameter controlling Mo mineralization. Mafic magma may supply water (and heat) to ore-forming granitic magmas, enhancing their Mo mineralization potential." @default.
• W2980366178 created "2019-10-25" @default.
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• W2980366178 date "2019-12-01" @default.
• W2980366178 modified "2023-10-04" @default.
• W2980366178 title "In situ major and trace element compositions of apatites from Luanchuan orecluster: Implications for porphyry Mo mineralization" @default.
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• W2980366178 doi "https://doi.org/10.1016/j.oregeorev.2019.103174" @default.
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