金沙江-红河成矿带北衙金多金属矿床成岩成矿时代研究
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摘要
北衙金多金属矿床位于云南省鹤庆县境内,是三江地区金沙江-红河富碱斑岩成矿带中最大的金矿(323t),共生和伴生的铜等金属也达到大型-特大型规模。斑岩侵入体在矿区广泛分布,是控制矿床形成的关键因素。通过总结前人对锆石U-Pb年龄和辉钼矿Re-Os的年龄研究,认为:该矿床富碱斑岩侵入时间为36.9~34.0 Ma,Cu-Mo-Au矿化时间为36.9~34.7 Ma,二者均集中在37~34 Ma,斑岩成岩作用与矿化作用几乎同时发生;矿床所在的金沙江-红河富碱斑岩成矿带斑岩侵入年龄、Cu-Mo-Au矿化年龄自北西至南东整体变小,其北段的成岩、成矿年龄分别为43.8~36.9 Ma和41.6~35.8 Ma,中南段则为37.1~34Ma和36.9~33.9Ma,主要处于青藏高原造山带的晚碰撞时期;其年龄差异可能是受金沙江-红河走滑断裂带自北西至南东依次减弱的影响及攀西裂谷期的继承性断裂制约。
The Beiyagold-polymetallic deposit is located in Heqing county,western Yunnan province.It is the biggest gold deposit in the Jinshajiang-Red River alkali-rich porphyry metallogenic belt within the Sanjiang region,with significant amounts of copper and other metals,whose reserves already reach largescale or super large-scale.The magmatic intrusions are widely distributed and genetically related to the mineralization in the deposit.Based on the predecessors'research of Zircon U-Pb age and Molybdenite Re-Os age,we deem that the ages of magmatic intrusions and mineralization are respectively 36.9~34.0 Ma and36.9~34.7 Ma,which both concentrate in 37~34 Ma and are almost at the same time.The ages of magmatic intrusions and mineralization in the Jinshajiang-Red River alkali-rich metallogenic belt,generally become younger from NW to SE.In the northern segment of the belt,the ages of magmatic intrusions and mineralization are respectively 43.8~36.9 Ma and 41.6~35.8 Ma.However,in the central-southernsegment,they are respectively 37.1~34 Ma and 36.9~33.9 Ma.It shows that the magmatic rock-forming and mineralization events happened in late-collisional transformation setting of Tibetan collisional orogenic belt.The different ages between the two segments are possible related to the weakening of the Jinshajiang-Red River strike-slip fault zones from NW to SE and the constraint from the inherited faults of Panxi rift period.
The Beiyagold-polymetallic deposit is located in Heqing county,western Yunnan province.It is the biggest gold deposit in the Jinshajiang-Red River alkali-rich porphyry metallogenic belt within the Sanjiang region,with significant amounts of copper and other metals,whose reserves already reach largescale or super large-scale.The magmatic intrusions are widely distributed and genetically related to the mineralization in the deposit.Based on the predecessors'research of Zircon U-Pb age and Molybdenite Re-Os age,we deem that the ages of magmatic intrusions and mineralization are respectively 36.9~34.0 Ma and36.9~34.7 Ma,which both concentrate in 37~34 Ma and are almost at the same time.The ages of magmatic intrusions and mineralization in the Jinshajiang-Red River alkali-rich metallogenic belt,generally become younger from NW to SE.In the northern segment of the belt,the ages of magmatic intrusions and mineralization are respectively 43.8~36.9 Ma and 41.6~35.8 Ma.However,in the central-southernsegment,they are respectively 37.1~34 Ma and 36.9~33.9 Ma.It shows that the magmatic rock-forming and mineralization events happened in late-collisional transformation setting of Tibetan collisional orogenic belt.The different ages between the two segments are possible related to the weakening of the Jinshajiang-Red River strike-slip fault zones from NW to SE and the constraint from the inherited faults of Panxi rift period.
引文
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