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Characteristics of Element Migration in the Process of Wall‐Rock Alteration in the Shibangou Gold Deposit, Western Henan
Author(s) -
Junhao WEI,
Jianwei LI,
Yanbin YUAN
Publication year - 1999
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.1755-6724.1999.tb00827.x
Subject(s) - geology , quartz , mineralization (soil science) , geochemistry , trace element , shear zone , mineralogy , wall rock , feldspar , tectonics , paleontology , soil science , soil water
The Shibangou gold deposit in western Henan is associated with irregular quartz veinlets occurring in altered shear zones dissecting a dioritic intrusion. The altered shear zones are characterized by silicification, pyritization, sericilization, chloritization and K‐feldspar alteration. Zoning of altered rocks adjacent to the Au‐bearing quartz veins is obviously exhibited. Fine‐grained sulphides and quartz veinlets of different ages and small‐scale fissures are widely distributed in the central part of the altered zones. Major mineralization types in this gold deposit are Au‐bearing quartz veinlets and altered rocks in the shear zones. Samples were collected from drilling cores according to the alteration zoning and mineralization type and all samples were analyzed for major and trace elements. Mass balance, volume change ( f v =97.3–71.9%) and major element variation sequences are studied in terms of major elements. The changes of mobile components (SiO 2 , K 2 O, Fe 2 O 3 ) and CaO) and immobile component (Al 2 O 3 ) in the wall‐rock alteration are discussed. The gold mineralization is associated with the enrichment of As, Ag, Hg and Pb and depletion of Cu and Zn. The study of compositional variation of altered rocks proves to be a very efficient method for defining the extent of wall‐rock alteration, fluid activity and mineralization and enrichment.