Yanjiatuan gold deposit is located in the Muping-Rushan metallogenic belt,one of the three major gold mineralization belts in the Jiaodong district.It is the altered rock type and sulfide quartz vein type complex gold deposit,controlled by small scale SN and NNE-trending faults is Queshan rock mass.Through mine-ralogical and electron probe analysis,the ore mineral characteristics and occurrence state of gold minerals in Yanjiatuan gold deposit are studied,and symbiotic assemblage and formation sequence of metal minerls are determined.Gold generally occurs as medium-fine size grains,including mainly intergranular gold and minor inclusion gold.The higher fineness and the enrichment of Bi indicates that gold was formed under the condition of medium depth.On the basis of summarizing regional metallogenic background and geological characteristics of the deposit,the genesis is discussed by analogy with mineralization ages of gold deposit in the area,we concluded that extensive delamination and crust-mantle interaction occurred in the Jiaodong lithosphere in the early Cretaceous,and that large amount of fluid derived from metamorphic dehydration of the subduction slab activated the gold in the Precambrian meta-basement,which migrated along Jinniushan faults.The gold formed the large scale mineralization in the joint of the SN and NNE-trending where the crushing and the porosities are development.
ZHANG Qibin, ZHANG Peng, XU Zhonghua, LIU Xiangdong, ZHANG Liangliang, WANG Bin, WANG Shanshan
. Geological Characteristics and Genesis of Yanjiatuan Gold Deposit in Muping,Shandong Province[J]. Gold Science and Technology, 2018
, 26(3)
: 279
-288
.
DOI: 10.11872/j.issn.1005-2518.2018.03.279
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