Re-Os and40Ar/39Ar dating of the Shujiadian copper deposit in Tongling, China: Implications for regional metallogenesis
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摘要:
舒家店铜矿床是长江中下游成矿带中新发现的斑岩型铜矿床, 位于铜陵断隆区与繁昌断凹区(盆地) 的过渡部位, 矿床成矿时代确定对该矿床成因研究及区域成矿规律的认识具有重要意义。在详细野外地质工作的基础上, 选择与黄铜矿密切共生的辉钼矿和热液蚀变矿物黑云母为对象, 分别利用Re-Os和40Ar-39Ar阶段加热同位素定年方法, 得到舒家店铜矿床辉钼矿Re-Os模式年龄和黑云母40Ar-39Ar坪年龄分别为140.6±2.0Ma和142.8±1.1Ma, 分别代表了舒家店铜矿床的矿化年龄和钾硅酸盐化蚀变年龄。并通过与铜陵断隆区和繁昌断凹区成岩作用和成矿时代的对比, 表明舒家店铜矿床属于铜陵断隆区中生代岩浆热液活动的产物。
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关键词:
- Re-Os, 40Ar/39Ar /
- 舒家店铜矿床 /
- 斑岩型铜矿床 /
- 铜陵断隆区
Abstract:The Shujiadian copper deposit, located between the Tongling fault uplift and the Fanchang fault basin in the Middle and Lower Yangtze River, is a newly discovered porphyry copper deposit. To determine the mineralization age and the geological characteristics of Shujiadian copper deposit are very important for the study of deposit genesis and regional metallogenic regularities. On the basis of geological and petrographic studies, we have conducted molybdenite Re-Os and biotite 40Ar-39Ar dating to precisely constrain the timing of mineralization in the deposit. The results show that copper mineralization and hydrothermal biotite alteration occurred at 140.6±2.0Ma and 142.8±1.1Ma. A synthesis of diagenesis and existing geochronological data indicates that the Shujiadian deposit formed as a result of the Early Cretaceous giant metallogenic event within the Tongling fault uplift.
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图 1
铜陵-繁昌地区地质略图(a, 据常印佛等, 1991修改) 和舒家店矿区地质略图(b, 据华东冶金地质勘查研究院, 2011①修改)
Figure 1.
Geological map of Tongling-Fangchang area showing major Cu-Au deposits (a, modified after Chang et al., 1991) and geological map of the Shujiadian deposit (b)
图 2
舒家店铜矿床主要的矿石类型和蚀变类型
Figure 2.
The main ore types and alteration types of Shujiadian copper deposit
图 3
舒家店铜矿床矿石中Q-Mo-Cp-Py脉(a) 和蚀变岩中Bi脉显微照片(b)
Figure 3.
Micrograph of Q-Mo-Cp-Py vein in ore (a) and Bi vein of altered pyroxene diorite (b) of Shujiadian copper deposit
图 4
舒家店铜矿床黑云母40Ar/39Ar坪年龄(a) 和等时线年龄(b) 图解
Figure 4.
The40Ar/39Ar spectrum age diagram (a) and isochronal age diagram (b) of biotite in the Shujiadian copper deposit
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