摘要
拉屋矿床位于西藏自治区当雄县境内,大地构造位置处于冈底斯成矿区申扎-旁多铜、银、铅、锌、金成矿带,为大型矽卡岩型铜铅多金属矿床。在系统研究拉屋矿床地质地球化学特征的基础上,以矿石的磁黄铁矿为对象,测定Re-Os同位素年龄,获得等时线年龄数据为(309±31)Ma,187Os/188Os的初始值为0.51±0.12,γOs值为306.90～880.29,Re/Os为20.46～80.46。上述结果,结合矿区野外地质特征和稳定同位素特征,证明拉屋矿床主要形成于晚石炭世来故期,其成矿物质来源于地幔,并在喷流过程中与地壳海底卤水汇合,遭受了壳源物质的混染,形成喷流成因矽卡岩型矿床。
The Lawu ore deposit is located in Damxung County of Tibet and within the Shenzha-Pangduo Cu-Ag-Pb-Zn-Au ore-forming belt in the Gangdise metallogenic district. A ^187Re-^187Os isochron of 309±31 Ma was obtained for samples of pyrrhotite from the Lawu district,with the initial value being ^187Os/^188Os, γOs values and Re/Os ratios being 0.51 ±0.12, 306.90±880.29 and 20.46-80.46, respectively. In combination with the field geological and stable isotopic features, the Lawu ore deposit is considered to have been formed in Late Carboniferous Laigu period, and the ore-forming materials were probably derived from the mantle and severely contaminated by the crust, thus forming a sedex skarn ore deposit.
出处
《地质通报》
CAS
CSCD
北大核心
2011年第8期1283-1293,共11页
Geological Bulletin of China
基金
国家"973"计划项目<青藏高原南部大陆聚合与成矿作用>之课题三<青藏高原南部增生造山成矿系统发育机制>(编号:2011CB403103)
国家科技支撑课题<西藏班公湖岛弧带铜
金
富铁矿评价与综合找矿技术方法示范研究>(编号:2006BAB01A05)之专题<区域成矿模型与典型矿床成因模型研究>
中国地质调查局青藏专项<西藏班公湖-怒江成矿带找矿远景区评价>(编号:1212010818097)
