Research On Metallization Of Xiaotongjiabuzi Gold Deposit In Eastern Liaoning Province

Xiaotongjiabuzi gold deposit located in the middle of the Paleoproterozoic Liaodong rift, which is occurred in the carbonatite of Dashiqiao Formation and the schist of Gaixian Formation, is a big gold deposit in the Qingchengzi ore concerntration area. This deposit could date from the sedimentary stage at initial stage of rifting, and then it underwent regional metamorphism and magmation, and metallogenic material eventually precipitated in favorable tectonic position.The deposit is controlled by stratum?lithology and structure. The lithologic switched interface of Dashiqiao Formation and Gaixian Formation is the favorable metallogenic position, and the interbedded peel faults and fold slippage parts provide space for the occurrence of the ore bodies. Magmation are strong in this area. Magmation provide the conditions for activation of metallogenic material, and magmas also provide some ore-forming fluid and metallogenic material.On the base of analysis of the regional metallogenic background, the characteristics of the deposit geological feature are summarized. Through discussing the minerogenetic conditions from the aspects of the stratum?structure?magmatite?ore-forming fluid and metallogenic material, the metallization is discussed and the metallogenic model is put forward.Based on the trace element research in Xiaotongjiabuzi gold deposit, the enrichment and loss of trace element in the ore body and in the magmatite are basically identical, so in the process of ore forming, it is influenced by magmation and segmental metallogenic material come from the magmatite.Based on the rare earth element research in Xiaotongjiabuzi gold deposit, the distribution patterns of the rare earth element in the ore body and in the magmatite are basically identical, this shows the close relationship between gold metallization and stratum. The Indosinian-Yanshanian magmation superpose and rebuilt the gold deposit.Based on the fluid inclusion reaearch, early ore-forming fluid is mainly sedimentary-metamorphic fluid, and in the later period magmatic fluid and meteoric water take part in the metallization, so the ore-forming fluid is composited. The ore-forming temperature is 100?300?.According to the studies of geology-geochemistry in the deposit, the area experience the process of sedimentation?regional metamorphism?magmatic fluid superposition and rebuilt. In this gold deposit, gold metallization is mainly sedimentary-metamorphic effect, and is also influenced by late magmatic hydrothermal.