Geochronology Research and Its Significance for Mo-W Polymetallic Deposit of Dabao Mountain in Northern Guangdong province
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摘要: 本文对大宝山钼钨多金属矿床中不同类型矿石中黄铁矿及石英矿物用Rb-Sr等时线法进行了精细测定,分别获得层纹状矿石中黄铁矿的年龄为168±5Ma(95%可信度),辉钼矿石英脉中石英矿物年龄为164+3Ma(95%可信度)和黄铁矿石英脉中石英矿物年龄为162±4Ma(95%可信度),测定结果表明,大宝山铝钨多金属矿床铜铅锌和钼钨成矿阶段形成的时间在168~162Ma之间。本研究所获得的结果也与前人所获得的层状铜铅锌矿石和脉状矿石中辉钼矿的Re-Os模式年龄为165+1Ma一致。鉴于铜铅锌和钼钨矿床在形成时间和空间上与次英安斑岩和花岗闪长斑岩具有明显的耦合关系,据此表明,其成矿作用主要与区内燕山早期岩浆活动有关。Abstract: Through the precise dating measuring of the pyrite and quartz minerals in different types of Mo-W polymetallic deposits in Dabao mountain, northern Guangdong province with Rb-Sr isochron method, the age of the pyrite in laminated ores is yielded 168±5Ma (95% reliability), the age of quartz minerals in quartz-molybdenite veins is yielded 164±3 Ma (95% reliability), and the age of quartz minerals in pyrite- quartz lodes is yielded 162±4 Ma (95% reliability) respectively. The results showed that the Cu-Pb-Zn ores and the Mo-W minerals of Dabao polymetallic deposit were formed at 168 - 162 Ma. The results also agreed with former studies that the pyrrhotite minerals formation time was between 165±1 Ma by Re-Os dating method. In consideration of the obviously coupled relationships of the formation time and space between the Cu-Pb-Zn and Mo-W minerals and the secondary dacite and granodiorite porphyry, it showed that the min- eralization of the deposit was related to the early magmatic activities of Yanshan movement in these areas.
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