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Geology and Geochemistry of the Bianbianshan Au‐Ag‐Cu‐Pb‐Zn Deposit, Southern Da Hinggan Mountains, Northeastern China
Author(s) -
Qingdong ZENG,
Jianming LIU,
Hongtao LIU
Publication year - 2012
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/j.1755-6724.2012.00691.x
Subject(s) - sericite , geology , pyrite , geochemistry , galena , rhyolite , sphalerite , quartz , molybdenite , epidote , hydrothermal circulation , meteoric water , chlorite , calcite , mineralogy , fluid inclusions , volcanic rock , paleontology , volcano , seismology
The Bianbianshan deposit, the unique gold‐polymetal (Au‐Ag‐Cu‐Pb‐Zn) veined deposit of the polymetal metallogenic belt of the southern segment of Da Hinggan Mountains mineral province, is located at the southern part of the Hercynian fold belt of the south segment of Da Hinggan Mountains mineral province, NE China. Ores at the Bianbianshan deposit occur within Cretaceous andesite and rhyolite in the form of gold‐bearing quartz veins and veinlet groups containing native gold, electrum, pyrite, chalcopyrite, galena and sphalerite. The deposit is hosted by structurally controlled faults associated with intense hydrothermal alteration. The typical alteration assemblage is sericite + chlorite + calcite + quartz, with an inner pyrite – sericite – quartz zone and an outer seicite – chlorite – calcite – epidote zone between orebodies and wall rocks. δ 34 S values of 17 sulfides from ores changing from –1.67 to +0.49‰ with average of –0.49‰, are similar to δ 34 S values of magmatic or igneous sulfide sulfur. 206 Pb/ 204 Pb, 207 Pb/ 204 Pb and 208 Pb/ 204 Pb data of sulfide from ores range within 17.66–17.75, 15.50–15.60, and 37.64–38.00, respectively. These sulfur and lead isotope compositions imply that ore‐forming materials might mainly originate from deep sources. H and O isotope study of quartz from ore‐bearing veins indicate a mixed source of deep‐seated magmatic water and shallower meteoric water. The ore formations resulted from a combination of hydrothermal fluid mixing and a structural setting favoring gold‐polymetal deposition. Fluid mixing was possibly the key factor resulting in Au‐Ag‐Cu‐Pb‐Zn deposition in the deposit. The metallogenesis of the Bianbianshan deposit may have a relationship with the Cretaceous volcanic‐subvolcanic magmatic activity, and formed during the late stage of the crust thinning of North China.