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Geological Characteristics and Molybdenite Re‐Os Isotopic Dating of the Doupo Mo Deposit, Dabie Orogen, Eastern China
Author(s) -
MENG Fang,
YE Huishou,
GAO Yang
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12368_17
Subject(s) - metallogeny , beijing , china , chinese academy of sciences , geology , geochemistry , molybdenite , mineral resource classification , library science , archaeology , geography , sphalerite , quartz , paleontology , computer science , pyrite , fluid inclusions
The Doupo Mo Deposit is adjoined The Lingshan granite which between LingshanLuoshan, Xinyang area, Henan province, and Dawu, Hubei province, in the northern Dabie orogenic belt. The hydrothermal alteration types of wall rocks in the Doupo Mo deposit include silicification, K-felspar alteration, sericitization, and pyritization, etc. and the main ore-forming types are disseminated, veinlet, stockwork and laminated molybdenite mineralizations. The major metallogenic epoch could be devided into 4 stages: K-felspar-quartz stage, quartz-molybdenitestage, quartz-polymetallic sulfidestage, and quartz-carbonate stage. The deposit is of typical porphyry Mo deposit type. Aqueous two-phase inclusions is predominant of the main metallogenic epoch in fluid inclusion. Their homogeneous temperatures of the main metallogenic epoch were concentrated in 170.4~432.1°C, their salinities were concentrated in 0.35~13.5 wt % NaCleq., Their average ore-forming pressures and depths were 21.39MPa and 0.79km respectively. Gas composition of fluid inclusions mostly includes H2O, CO2, N2 and O2 and a small amount of reducing gas like CH4, C2H4, C2H6, C2H2. Cations of liquid composition are dominant with Ca, Na, K, followed by Mg. Anions are mainly consist of SO4, F, Cl, with minor Br. H-O isotope analyses suggest that the source of ore-forming fluid is probably the combination of magmatic water and the meteoric water. The Surfer isotope composition shows that it comes from the mantle. The Pb isotope composition shows that the metallogenic material was mainly derived from the crust with mingling of mantle materials. 2 The Result of Re-Os Isotopic Dating