Research on the origin of ore-forming fluid at Qiaogashan gold deposit

Citation
W. Zhai et al., Research on the origin of ore-forming fluid at Qiaogashan gold deposit, ACTA PETR S, 16(4), 2000, pp. 531-534
Citations number
12
Language
CHINESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
ACTA PETROLOGICA SINICA
ISSN journal
1000-0569 → ACNP
Volume
16
Issue
4
Year of publication
2000
Pages
531 - 534
Database
ISI
SICI code
1000-0569(200011)16:4<531:ROTOOO>2.0.ZU;2-Z
Abstract
The analysis of gas compositions of fluid inclusions in quartz veins, which were formed in metallogenesis of brittle-ductile shear metamorphism, and s uffered from different grade shearing, shows that from mylonitized quartz v ein --> primary mylonite quartz vein --> quartz vein mylonite, the total co ntents of gas compositions, the contents of main component H2O and CO2 decr ease, and the fluid inclusions in minerals of sheared rocks may be one of t he main source of ore-forming fluid of gold deposit in ductile shear zone. The quartz veins formed in two main metallogenetic stages have similar char acteristics of hydrogen and oxygen isotope, delta O-18(H2O) = 5.25 parts pe r thousand similar to 8.64 parts per thousand, deltaD(H2O) = - 70.9 parts p er thousand similar to - 42.0 parts per thousand. Ore-forming fluids in she ar zone were homogenized by shear metamorphism, and the range of hydrogen a nd oxygen isotope change of ore-forming fluid is small.