机构地区： 中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室
出 处： 《矿床地质》 2012年第2期255-270,共16页
摘 要： 河北省青龙满族自治县四拨子-六拨子钼铜矿位于燕辽成矿带东部,是近年来发现的中型钼铜矿床。矿化多沿层面、裂隙充填、交代,呈脉状赋存于大红峪组的石英砂岩、长石石英砂岩及白云岩夹层和高于庄组的白云岩内,地质特征表明成矿主要与硅化关系密切。文章对矿区6个侵入岩进行了锆石LA-ICP-MS U-Pb年代学研究,结果表明,矿区存在4期岩浆侵入活动：第一期为晚三叠世（211~206 Ma）,形成六柱坪和三拨子西沟细粒似斑状二长花岗岩;第二期为早侏罗世早期（196~190 Ma）,形成老商家和五拨子花岗斑岩;第三期为早侏罗世晚期（177Ma）,形成达子沟细粒似斑状二长花岗岩;第四期为晚侏罗世早期（160 Ma）,形成七拨子粗中粒二长花岗岩。矿区辉钼矿的Re-Os加权平均年龄为（194±1）Ma,成矿时代为早侏罗世,与花岗斑岩形成时代一致（196~190 Ma）,表明钼铜成矿可能与花岗斑岩岩浆期后热液活动有关。 Located in eastern Yanliao metallogenic belt,the Siboozi-Liubozi molybdenum-copper deposit in Qinglong County is a newly-discovered medium-sized molybdenum-copper deposit.Mineralization mainly appears in metasomatic and filling forms along bedded planes and fractures,and occurs as veins in quartz sandstone,feldspar-quartz sandstone,and dolomite intercalations in Dahongyu Formation and dolomite in Gaoyuzhuang Formation.Geological features indicate that molybdenite is closely related to silicification.Zircon LA-ICP-MS U-Pb dating of six intrusive rocks of the ore deposit was studied in this paper,and the result suggests that there exsited four stages of magmatic intrusion in the ore deposit： the first stage is the late Triassic（211~206 Ma）,in which fine-grained porphyraceous monzogranite formed in Liuzhuping and Xigou of Sanbozi;the second stage is the earliest Jurassic（196~190 Ma）,in which granite-porphyry formed in Laoshangjia and Wubozi;the third stage is the late early Jurassic（177 Ma）,in which fine-grained porphyraceous monzogranite was produced in Dazigou;the fourth stage is the early late Jurassic（160 Ma）,in which coarse-medium-grained monzogranite came into being in Qibozi.Re-Os weighted mean age of molybdenite from the ore eposit is（194±1） Ma,which is in accord with the age of the granite-porphyry（196~190 Ma）,suggesting that the metallogenic epoch is early Jurassic and that Mo-Cu metallogenesis is probably related to late granite-porphyry magmatic-hydrothermal activity.
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