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Metamorphic Rock‐hosted Disseminated Gold Deposits—A Case Study of the Xiaotongjiapuzi Gold Deposit of Eastern Liaoning
Author(s) -
Guoping LIU,
Yongfu AI,
Kezhu FENG,
Zhimin ZHANG
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.tb00852.x
Subject(s) - metamorphic rock , geology , sericite , geochemistry , greenschist , pyrite , arsenopyrite , terrane , metamorphic facies , protolith , quartz , mineralization (soil science) , mineralogy , facies , geomorphology , copper , chemistry , paleontology , chalcopyrite , organic chemistry , structural basin , tectonics , soil water , soil science
The Xiaotongjiapuzi gold deposit occurs in a Palaeoproterozoic rift accretionary terrane in eastern Liaoning and is hosted by a carbonate formation of the Dashiqiao Formation, Liaohe Group. The metamorphic grade of the host rock is low amphibolite‐high greenschist facies. Gold, which is mainly invisible, is distributed in pyrite and arsenopyrite. The grains of Au‐bearing sulphide minerals are fine, ranging from 0.0 n to 1 mm. The wall‐rock alterations are characterized by low‐temperature silification, hydro‐sericitization, sericitization and carbonatization. The homogenization temperatures of the fluid inclusions in quartz closely associated with gold mineralization range from 140 to 240°C. The metallogenic age represented by the Ar‐Ar isotopic age of sericite is 167 Ma. Comparisons and studies show that the Xiaotongjiapuzi gold deposit can be classified as the submicron‐sized disseminated deposit (analogous to the Carlin‐type) hosted in metamorphic rocks.