Geological characteristics and genesis of Linglong Gold Deposit in Jiaodong
Linglong Gold Deposit,located in the northwestern part of the Jiaodong large-scale gold province in the eastern North China Craton,is one of the world's typical quartz vein-type gold deposits,with total gold resources exceed-ing 1000 t.However,there has been ongoing debate regarding its genesis.By systematically summarizing the geological characteristics,geochronology,characteristics of ore-forming fluids,and isotope data of Linglong Gold Deposit,this study thoroughly discusses its geological characteristics and genesis.The formation age of Linglong Gold Deposit is con-centrated 120-125 Ma.The ore-forming fluids are generally medium-to-low-temperature,low-salinity,and low-density hydrothermal fluids,primarily derived from magmatic fluids with a minor contribution from meteoric water.C-H-O-S-Pb isotopes indicate that the ore-forming fluids of Linglong Gold Deposit mainly originated from mantle-derived magmatic fluids,with some contribution from crustal fluids.During the Early Cretaceous,lithospheric delamination and thinning in the eastern North China Craton triggered asthenospheric upwelling,leading to continuous underplating of the lithospheric mantle,which partially melted to form mafic dyke magma.As the mafic dyke magma ascended to the shallow crust,rapid decreases in temperature and pressure caused degassing and fluid formation,which precipitated along secondary faults to form the gold deposit,exhibiting the typical characteristics of Jiaodong-type gold deposits.
Jiaodong-typeLinglong Gold Depositquartz vein-type gold depositore-forming fluidsdeposit gene-sismineralization age
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