内蒙古绥和查干地区多金属矿床流体包裹体研究

Study on Fluid Inclusions in Polymetallic Deposit in Suihechagan Area of Inner Mongolia

摘要:

内蒙古绥和查干铜铅锌多金属矿床是典型的热液矿床，处于大兴安岭成矿带南段、内蒙古二连东乌旗铁铜钼多金属成矿远景区。该文对矿床中流体包裹体进行研究，结果发现，矿床划分为2个成矿期次：早阶段属中高温（320~380℃）；晚阶段属中低温（140~160℃）。包裹体的捕获温度也存在2个高峰期，矿床属于中—高温热液矿床。盐度也存在2个高峰范围，第一个高峰范围在0~4%之间；第二个高峰范围在5%~9.6%之间。流体压力范围介于22.6~101.4MPa，均值为59.9MPa，成矿的平均深度为当时地表以下1.95km，属中深成矿床，成矿流体具有中—高温至中—低盐度性质。2个成矿期次和矿区的2次构造运动相对应，矿体定位受断裂构造控制，属于典型的断控脉状矿床。

Abstract:

CuPbZn polymetallic deposit in Suihechagan area of Inner Mongolia is a typical hydrothermal deposit. It locates in the southen section of Daxing'anling metallogenic belt, and ErlianWudongqi FeCuMo multimetal metallogenic prospect areas in Inner Mongolia. Through study on fluid inclusions in this deposit, it is found that this deposit can be divided into two metallogenic stages: early stage is in mediumhigh temperature phase (320~380℃) and the late stage is in low temperature phase(140~160℃). The trapping temperature of inclusion also has two peaks, and the deposit belongs to mediumhigh temperature hydrothermal type. Two peak values also exist in salinity: the first peak scope is 0%~4% and the second peak is 5%~9.6%. Fluid pressure value is 22.6~101.4MPa, and the average value is 59.9MPa. The average depth of oreforming is 1.95km below the surface at that time, so this deposit belongs to medium-deep type deposit. The Metallogenic fluid is mediumhigh temperature type, medium voltage, low salinity on the whole. Two metallogenic stages are corresponding with two tectonic movements. Ore bodies are controlled by fractural structures and belong to typical fault control vein deposit.