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The Geologic Histroy of the IOCG Deposits in Southwestern China
Author(s) -
SONG Hao,
NI Shijun,
ZHANG Chengjiang,
XU Zhengqi,
SONG Shiwei
Publication year - 2014
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 - 10.1111/1755-6724.12372_15
Subject(s) - china , geography , chinese academy of sciences , library science , archaeology , computer science
There are a large number of copper-iron deposits, which are characterized by large scale and associated with polymetallic mineralization, in the precambrian stratigraphic units in southwestern Yangtze Block. Research on Lala, Dahongshan deposits have an important theoretical significance and practical value, for their large scale-typical ore deposits and association with Au-Ag-CoMo-REE-U polymetallic mineralization, which define a major IOCG metallogenic province (Greentree, 2007; Zhao et al., 2011; Song, 2014). Based on research of these typical deposits, such as the Lala in Huili, Dahongshan in Xinping, Yinachang in Wuding, Chehe in Yuanjiang, etc., this work has studied the continental geodynamics, the age of magmatic rocks and metallogenic epoch, the coupling relationship between polymetallic elements, the source of ore-forming fluid and the coupling relationship between magma evolution and polymetallic mineralization. With systematical study on the fluid inclusions, the stable and rare gas isotopes and the geochemistry of the trace and rare earth elements, the source of metals and ore-forming fluid are identified on basis of the study on the geological features of these deposits. The relationships between the marine volcanism, the magmatism, the late hydrothermal superimposition and polymetallic mineralization have been discussed. The mineralization mechanism and the metallogenic regularities of the IOCG deposits in this area were revealed. The metallogenic model of these deposits and their regional metallogeny mainly about the metallogenetic space-time evolution in southwestern margin of Yangtze Block have been established, and the metallogenic series were outlined eventually.