投稿时间：2015-04-21
修订日期：2015-12-07
网络发布日期：2016-02-24
中文摘要:土屋和延东铜矿床位于东天山大南湖-头苏泉岛弧带南部,是中 亚成矿带的 重要组成部分。文章根据脉次穿插关系、蚀变矿物组合及矿物共生关系,将土屋和延东铜矿 床均划分为斑岩成矿期、叠加改造期和表生期 3个期次。土屋铜矿床的铜矿化形成于斑岩成矿期和叠加改造期,而延东铜矿床 的铜矿化主要形成于叠加改造期；土屋和延东铜矿床伴生的钼矿化主要形成于叠加改造期。 因此,笔者认为前人获得的辉钼矿Re-Os年龄(3262～3227 Ma)代表叠加改造期的 成矿年龄,该 期矿化与石英钠长斑岩((3236±25) Ma)的侵入相关,而斑岩成矿期的矿化与斜长 花岗斑岩(339～332 Ma)相关,成矿年龄为3412～3339 Ma。叠加改造期的 存在,使得斑岩成矿期的蚀变分带可能受到了叠加和破坏。
Abstract:The Tuwu and Yandong copper deposits, located in the southern segment of the Dananhu-Tousuquan island arc belt, are important parts of the Central Asian Met allogenic Belt. According to the crosscutting relationships and mineral assembla ges, the mineralization in both Tuwu and Yandong copper deposits can be divided into three periods: the porphyritic-mineralization period, the overlapped-minera lization period and the supergene period. The porphyritic-mineralization period and the overlapped-mineralization period are the metallogenic periods of copper in the Tuwu copper deposit, while the overlapped-mineralization period is the mo st important copper metallogenic period in the Yandong copper deposit. In additi on, the associated molybdenite mineralization was mainly existent in the overlap ped-mineralization period in Tuwu and Yandong. Therefore, the molybdenite Re-Os ages (3262～3227 Ma) obtained in previous studies should represent the age of the overlapped-mineralization period in the Tuwu and Yandong copper deposits, and t he porphyritic-mineralization, with the age of 3412～3339 Ma, is the result of the ore-bearing plagiogranite porphyry (339～332 Ma). The emplacement of quartz a lbite porphyry ((3236 ± 25) Ma) is thought to have caused the overlapped-mi ne ralization which destroyed and modified the previous porphyritic-mineralization.
文章编号：
中图分类号：P618.41
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基金项目:本文受到国家重点基础研究计划“973”项目“新疆北部古弧盆体系成矿机理(批准号: 2014CB440802)”资助
引用文本：
王云峰,陈华勇,肖兵,韩金生,杨俊.2016.新疆东天山地区土屋和延东铜矿床斑岩叠加改造成矿作用[J].矿床地质,35(1):51~68WANG YunFeng,CHEN HuaYong,XIAO Bing,HAN JinSheng,YANG JunTao.2016.Porphyritic-overlapped mineralization of Tuwu and Yandong copper deposits in Eastern Tianshan Mountains, Xinjiang[J].Mineral Deposits35(1):51~68
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