西天山哈勒尕提铁铜多金属矿床成岩成矿时代:锆石U-Pb和辉钼矿Re-Os同位素年代学  

Intrusive and Mineralization Ages of the Halegati Fe-Cu Polymetallic Deposit in the West Tianshan:Evidence from Zircon U-Pb and Molybdenite Re-Os Geochronology

作　　者：顾雪祥[1,2] 章永梅[1,2] 周超[1] 刘瑞萍[1] 章幼惠 王新利[1] 彭义伟[1] 董连慧[4] 涂其军[4] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083 [3]中国冶金地质总局中南地质勘查院,武汉430081 [4]新疆地质矿产勘查开发局,乌鲁木齐830000

出　　处：《矿物岩石地球化学通报》2014年第5期614-623,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(U1303292);国家科技支撑计划项目(2011BAB06B02-02)

摘　　要：哈勒尕提铁铜多金属矿床是新疆西天山北缘博罗科努多金属成矿带上的一个典型矽卡岩矿床,其成岩成矿时代此前尚无确切的年代学资料。作者通过对与成矿相关的二长花岗岩和花岗闪长岩中锆石的LA-ICP-MS U-Pb同位素测定,获得其加权平均年龄分别为(376.4±3.2)Ma和(365.6±3.5)Ma,表明其侵入时代为晚泥盆世,代表了晚古生代北天山洋向南部伊犁板块俯冲消减背景下的岩浆作用产物。矽卡岩矿石中辉钼矿Re-Os等时线年龄为(368.9±3.1)Ma,加权平均年龄为(366±2)Ma,与成岩时代在误差范围内一致。哈勒尕提矿床与同一成矿带上的艾木斯呆依"可克萨拉铁铜矿床、莱历斯高尔-3571铜钼矿床等一起,构成了一个与晚泥盆世—早石炭世中酸性侵入岩有关的矽卡岩-斑岩型铁铜钼多金属成矿系统。The Halegati Fe-Cu polymetallic deposit is a typical skarn deposit located in the Boluokenu mineralization belt in the northern West Tianshan,Xinjiang Province.It occurs at the contact zone between the Dawabulake inter mediate acidic intrusive rocks and Upper Ordovician carbonate rocks.The timing of host rock intrusion and mineralization remians unknown up to now.LA-ICP-MS U-Pb dating on zircons in monzogranite and granodiorite from the ore related intrusive body by this study gave weighted average ages of 376.4±3.2 Ma and 365.6±3.5 Ma,respectively,indicating its intrusion happened in the Late Devonian during the southward subduction of the North Tianshan ocean under the Yili plate.Re Os dating on molybdenite from the skarn ore yeilded an isochron age of 368.9±3.1 Ma and a weighted average age of 366±2.0 Ma that are concordant with the intrusive ages of the host igneous rocks within the measurement uncertainties.The Halegati and the other deposits in the Boluokenu belt such as Aimusidaiyi-Kekesala Fe-Cu and Lailisigaoer 3571 Cu-Mo deposits constitute a skarn-porphyry Fe-Cu-Mo polymetallic mineralization system associated with the Late Devonian to Early Carboniferous intrusions.

关 键 词：U-Pb年龄 RE-OS年龄 矽卡岩型铁铜多金属矿床 哈勒尕提 西天山 

分 类 号：P597.3[天文地球—地球化学] P618.2[天文地球—地质学]