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Helium, Argon, and Xenon Isotopic Compositions of Ore‐forming Fluids in Jinding‐Baiyangping Polymetallic Deposits, Yunnan, Southwest China
Author(s) -
Chunji XUE,
Denghong WANG,
Yuchuan CHEN,
Jianmin YANG,
Weiguang YANG
Publication year - 2000
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.1755-6724.2000.tb00016.x
Subject(s) - mantle (geology) , xenon , helium , geochemistry , geology , crust , fluid inclusions , argon , isotopes of helium , chemistry , hydrothermal circulation , paleontology , organic chemistry
The Jinding superlarge lead and zinc deposit has attracted the attention of geologists of the world and its metallogenesis has long been in dispute. This paper takes the Jinding deposit and the Baiyangping Cu‐Ag‐Co deposit which was recently found at about 30 km north of Jinding as one ore belt, and, based on researches on the helium, argon, and xenon isotopic compositions of primary inclusions in ore‐forming solutions of the main stage, the authors have found that the 3 He/ 4 He ratio of the ore‐forming fluid is 2.7×10 −6 (varying from 0.19 to 1.97 Ra), the 4 He/ 40 Ar ratio (0.24–3.12) is close to the mantle characteristic ratio, and the xenon isotopic composition and evolution show characters of the mantle xenon. The above results reveal the characteristics of mantle source and crust‐mantle fluid mixing (mantle helium reaching 32%) and the metallogenic contributions of the deep processes in the Jinding‐Baiyangping ore belt.