| The olivine xenocrysts, characterized by a deep source and produced by thedisruption of the mantle peridotites, occur in the lamprophyre veins (which have closespatial temporal relationship with the gold vein) in the Dongshan ore block (-620m and-670m levels) and in Xishan ore block (-50m level) of the Linglong gold deposit,Jiaodong peninsula. It is widely developed serpentinization and steatitization(serpentinization mainly in the Dongshan ore block and steatitization mainly in theXishan ore block). Computed based on alteration thermodynamics, the alterationtemperature of the Dongshan olivine xenocrysts is above282℃, while the Xishan isbelow243℃. So, according to the temperature data of gold ore-forming fluid inclusion,the alteration temperature ranges of the Dongshan olivine xenocrysts and the Xishan are282～300℃and200～243℃. So the lamprophyre and gold mineralization are geneticrelationshipIn addition, The stomatal and amygdale could be found in Diorite vein in Linglonggold field.The amygdala external "shell", which is formed by biotite gathered inside iscomposed of quartz and calcite filling "benevolence". Microscope "amygdala" can alsomeet there are pyrite and iron oxide, diorite mass magma and ore fluid.Comprehensive ore deposit geological characteristics of the thought, lamprophyre,diorite magma system such as small volume should belong to the fluid in themetallogenic subsystems. That is, due to the ore-forming fluid metal solubility waspositively related with P-T, as rising magma emplacement, the ore-forming metals togather and unloading under certain condition. After unloading of ore-forming metal fluidexists a phase separation process, part of the gas under the effect of phase separationoutwards trying to escape. But, due to magma cools fast, preserved in the form of porefluid escaping paths pore structure, pore bai cooling crystallization of mineral fillingform the amygdala. Through thin section observation "amygdala" contained in pyrite andiron oxide, suggesting vein rock magma contains a lot of ore fluid. Illustrate the darkground can blocking channels, make carry metal ore-forming fluid preserved.Therefore, lamprophyre, diorite vein may cause is closely associated with goldmineralization. |
PDF Full Text Request