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Geological and Tectonic Constraints on the Tianjingshan Gold Deposit in the Jiangnan Block, South Anhui
Author(s) -
YANG Xiaoyong,
DUAN Liuan,
SUN Weidong
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 - 10.1111/1755-6724.12375_71
Subject(s) - crust , geochronology , geochemistry , china , mantle (geology) , geology , tectonics , library science , earth science , seismology , geography , archaeology , computer science
Orogenic gold deposits are the most important type in the world, which are mainly controlled by three key factors (Sun et al., 2013): (1) abundant andesitic rocks (SiO2 of 55–60 wt.%) at depth, which have systematically higher Au contents than other rock types; (2) a pervasive transition from greenschist facies to amphibolite facies metamorphism within a short period, which releases S rich fluids that may scavenge Au from host rocks; and (3) deformation and fracturing under a compressive/ transpressive tectonic regime. Previous studies showed that orogenic Au deposits were usually formedapproximately 50–200 million years after the formationof the corresponding juvenile crust. The crust ages ofthe North China and Yangtze cratons are much older than the associated deposits, which has drawn theattention of economic geologists (Goldfarb et al., 2007; Sun et al., 2013). Moreover, the whole of eastern China has been affected by the change in the direction of Pacific plate motions. This paper focuses on the Xiaohe gold deposit in Jiangnan block, south Anhui by means of geological survey, element analysis and statistical research on geochemical database of sedimentary rocks, magmatic rocks and gold deposits around the deposit. The systematic statistics on both Xiaohe and Jinshan gold deposits nearby on major and trace elements has been made for discussing relationship between gold formation and geologic strata, magma rock and regional structure. We established engineering in this deposit and obtained good ore bodies in the Xiaohe gold deposit which proves that this region is good for prospecting large-scale gold deposit in south Anhui. 2 Regional Geological Background