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九瑞地区斑岩-矽卡岩型矿床是长江中下游地区Cu-Au-Mo(Fe)多金属成矿带的重要组成部分,宝山铜多金属矿床是江西省实施找矿突破战略以来,在九瑞矿集区界首—大桥背斜核部新发现的首个中型以上斑岩-矽卡岩型铜多金属矿床。本文利用辉钼矿Re-Os同位素定年方法对宝山矿床进行了成矿时代的研究,获得了6件辉钼矿Re-Os同位素模式年龄为(147.2±3.6)Ma~(150.5±2.7)Ma,加权平均年龄为(148±1)Ma,MSWD=1.03。6件样品其等时线年龄为(148.6±2.6)Ma,MSWD=1.9,代表了宝山矿床的成矿时代,与九瑞矿集区其他斑岩-矽卡岩型铜多金属矿床(武山、城门山、湖北丰山洞、鸡笼山、宋家冲、邓家山、通江岭)以及长江中下游地区鄂东南、铜陵矿集区斑岩-矽卡岩铜多金属矿床的形成时代高度一致,它们均为中国东部EW特堤斯构造域向NE古太平洋构造域大转折背景下,软流圈上涌和玄武质岩浆底侵而导致壳幔同熔所引起的燕山期花岗质岩浆岩活动的产物。
The porphyry-skarn deposits in Jiurui area are important components of Cu-Au-Mo (Fe) polymetallic metallogenic belt in the middle and lower reaches of the Yangtze River. Since Baoshan Copper-polymetallic deposit was a breakthrough strategy of prospecting in Jiangxi Province, The first medium-sized porphyry-skarn type copper polymetallic deposit newly discovered in the Jieshou-Jiaoqiao anticline core of Jiu Rui mining area. In this paper, the mineralization age of Baoshan deposit was studied by the Re-Os isotopic dating of molybdenite. The Re-Os isotopic patterns of the six molybdenites were (147.2 ± 3.6) Ma ~ (150.5 ± 2.7) Ma, The weighted average age was (148 ± 1) Ma and MSWD was 1.03.6. The isochron age of the samples was (148.6 ± 2.6) Ma and MSWD was 1.9, representing the mineralization age of Baoshan deposit, Other porphyry-skarn type copper polymetallic deposits (Wushan, Chengmenshan, Hubei Fengshan Cave, Jilongshan, Songjachong, Dengjiashan and Tongjiangling), and porphyry deposits in the southeastern Hubei and Tongling areas in the middle and lower reaches of the Yangtze River - skarn copper polymetallic deposits are highly consistent in age, all of which are the result of upwelling of asthenospheric upwelling and basaltic magma under the background of the great turning of the EW tectonic tectonics in East China to the NE Paleo-Pacific tectonic domain The product of the Yanshanian granitic magmatism caused by the same mantle melting.