Fluid inclusions studies of Xiaotongjiabuzi and Linjia gold deposits, Qingchengzi metallogenic belt

摘要

Xiaotongjiabuzi and Linjia gold deposits is located in eastern Liaoning Province, outside of Qingchengzi Pb-Zn ore-field. Gold deposits underwent earlier sedimentation-metamorphism epoch and later hydrothermal alternation epoch. The gold deposits are controlled by intercalated fractured zone of layer 4 and 5 of member 3 in marble of Dashiqiao formation. Host rocks were mainly marble, siliceous rocks, leptynite that were subject to extensive silicification. Paleoproterozoic Lueliang movement (2500-1800 Ma, Jianshan pluton) and Mesozoic Indosinian (250-205 Ma, Xinling pluton) volcanism were widespread in this region. In recent years, there have been discordant opinions pertaining to the source of the ore genesis, i.e. exhalative-sedimentary-type, carlin-type (Liu GP et.al, 2002), epithermal deposit (Wang WQ et.al, 2000), turbidite-type (Chen J, 2000), volcanic sedimentation-regional metamorphism-magmatic hydrothermal superposition deposit (Jiang Y etal, 1999). In this paper, studies on fluid inclusions have been given to explain the ore genesis.