摘要
内蒙古乌努格吐山斑岩铜钼矿床是我国东北地区大型铜钼矿床之一,其矿石中5件辉钼矿Re/Os同位素模式年龄介于(166.1±2.0)～(176.4±2.8)Ma之间,^(187)Re^(187)Os等时线年龄为178±10Ma(1σ误差,MSWD=3.3),代表流体成矿年龄。斑岩流体成矿系统发育在183±6Ma左右。在区域构造演化框架中,乌努格吐山斑岩铜钼矿床形成于陆陆碰撞过程的减压增温体制,而非与B型俯冲有关的岩浆弧环境。
The Wunugetu Shan porphyry Cu/Mo deposit, Inner Mongolia, is one of the largest Cu/Mo deposits in Northeast China. The Re/Os isotopic model ages of five molybdenite samples range from 166.1 +/- 2.0 to 176. 4 +/- 2.8Ma, and yield an isochron age of 178 +/- 10Ma (I sigma, MSWD = 3. 3), which is interpreted to be the hydrothermal metallogenic age of the deposit. The metallogenic porphyry-fluid system developed around 183 +/- 6Ma. In the regional tectonic evolution, the Wunugetu Shan porphyry Cu/Mo deposit was formed under a decompression-geothermal increasing regime during continental collision, instead of a magmatic arc related to B-type subduction.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第11期2881-2888,共8页
Acta Petrologica Sinica
基金
国家973项目2006CB403500号
自然科学基金项目(编号40425006
40352003和49972035)的资助。
关键词
铼锇等时线年龄
大陆碰撞
鸟努格吐山斑岩铜钼矿床
内蒙古
Re/Os isochron age
continental collision
wunugetu shan porphyry Cu/Mo deposit
inner Mongolia
