|
|||||
|
|
| 巴尔喀什成矿带Cu-Mo-W矿床的辉钼矿Re-Os同位素年龄测定及其地质意义 | |
| 引用本文： | 陈宣华,屈文俊,韩淑琴,Eleonora Seitmuratov,施炜,杨农,陈正乐,叶宝莹,曾法刚,杜安道,蒋荣宝,王志宏.巴尔喀什成矿带Cu-Mo-W矿床的辉钼矿Re-Os同位素年龄测定及其地质意义[J].地质学报,2010,84(9):1333-1348. |
| 作者姓名： | 陈宣华 屈文俊 韩淑琴 Eleonora Seitmuratov 施炜 杨农 陈正乐 叶宝莹 曾法刚 杜安道 蒋荣宝 王志宏 |
| 作者单位： | 1. 国土资源部新构造运动与地质灾害重点实验室,北京,100081;中国地质科学院地质力学研究所,北京,100081 2. 国家地质实验测试中心,北京,100037 3. 中国地质科学院地质力学研究所,北京,100081 4. Laboratory of Geological Formations, K. Satpaev Institute of Geological Sciences, Almaty, 050010, Kazakhstan 5. 中国地质大学,北京,100083 |
| 基金项目： | 国家科技支撑计划重点项目(编号 2007BAB25B02)资助的成果 |
| 摘 要： | 巴尔喀什成矿带是世界著名的中亚成矿域斑岩型铜钼成矿带,产出许多斑岩型铜钼矿床和一些石英脉-云英岩型钨钼矿床。中亚成矿域可能是一个多核成矿系统,具有以走滑断裂为边界构成的断裂构造体系并受之控制。本文对巴尔喀什成矿带巴尔喀什—阿克沙套地区11件辉钼矿样品进行了Re-Os同位素分析,得到博尔雷大型斑岩型铜(钼)矿床和东科翁腊德、扎涅特、阿克沙套石英脉-云英岩型钨钼矿床的辉钼矿模式年龄(平均值)分别为315.9Ma、298.0Ma、295.0Ma和289.3Ma;其中,东科温腊德、阿克沙套和扎涅特等3个矿床的Re-Os等时线年龄为297.9-+30..949Ma,MSWD值为0.97。辉钼矿Re-Os年龄说明巴尔喀什成矿带Cu-Mo-W成矿作用发生在315.9～289.3Ma期间,Cu-Mo-W矿床的形成可分为两期:一期为斑岩型铜钼矿床,约形成于315.9Ma;另一期为石英脉-云英岩型钨钼矿床,约形成于297.9Ma。根据辉钼矿模式年龄和等时线年龄,推测该地区花岗斑岩和伟晶岩的形成时代与相应的矿床基本同时,均为晚石炭世,属海西期构造岩浆活动的产物。通过与我国境内西、东准噶尔和东天山斑岩铜矿带的对比表明,巴尔喀什成矿带铜钼成矿作用的年龄介于东天山土屋—延东斑岩铜矿与西准噶尔包古图斑岩铜矿之间。分析表明,中亚成矿域大规模斑岩型铜钼成矿作用集中在晚石炭世,属海西晚期构造-岩浆活动的产物。 |
| 关 键 词： | Re-Os同位素年龄 辉钼矿 成矿时代 Cu-Mo-W矿床 巴尔喀什成矿带 哈萨克斯坦 |
| 收稿时间： | 2009/10/8 0:00:00 |
| 修稿时间： | 2009/10/8 0:00:00 |
Re-Os Dating of Molybdenites from Cu-Mo-W Deposits in Balkhash Metallogenic Belt, Kazakhstan and Its Geological Significance |
|
| Chen Xuanhua.Re-Os Dating of Molybdenites from Cu-Mo-W Deposits in Balkhash Metallogenic Belt, Kazakhstan and Its Geological Significance[J].Acta Geologica Sinica,2010,84(9):1333-1348. | |
| Authors: | Chen Xuanhua |
| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences |
| Abstract: | The Balkhash Metallogenic Belt in Kazakhstan, with the output of many porphyritic Cu-Mo deposits and some quartz-vein greisen W-Mo deposits, is a very famous porphyritic Cu-Mo metallogenic belt in Central Asian Metallogenic domain which is represented as a multiple core metallogenic system controlled by the boundary strike-slip fault system. In this paper 11 molybdenite samples from western Balkhash metallogenic belt are selected for Re-Os isotopic dating. The molybdenites from porphyritic Borly Cu-Mo deposit, and East Kounrad, Zhanet and Akshatau quartz-vein greisen W-Mo deposits, give average model Re-Os ages of 315.9 Ma, 298.0 Ma, 295.0 Ma and 289.3 Ma, respectively. Meanwhile, the molybdenites from East Kounrad, Zhanet and Akshatau W-Mo deposits give a Re-Os isochron age of 297.9 Ma, with MSWD of 0.97. Re-Os dating of molybdenites indicates that the Cu-Mo-W metallogenesis in western Balkhash metallogenic belt formed during Late Carboniferous to Early Permian (315.9 Ma~289.3 Ma), while porphyry Cu-Mo deposits formed at ~315.9 Ma, and quartz-vein greisen W-Mo deposits formed at ~297.9 Ma. The Re-Os model and isochron ages suggest that Late Carboniferous porphyry granitoid and pegmatite magmatism during Late Hercynian movement. Comparing to the Juggar-East Tianshan porphyry Cu metallogenic belt in northwestern China, the time of the Cu-Mo metallogenesis in Balkhash metallogenic belt, is between that of Tuwu- Yandong and Baogutu porphyry Cu deposits in East Tianshan and west Junggar. Concluded, the large-scale porphyry Cu-Mo metallogenesis in Central Metallogenic Domain centralized in Late Carboniferous due to Hercynian tectonic-magmatic activities. |
| Keywords: | Re-Os isotopic age molybdenite metallogenic time Cu-Mo-W deposits Balkhash Metallogenic Belt Kazakhstan |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《地质学报》浏览原始摘要信息 | |
| 点击此处可从《地质学报》下载免费的PDF全文 | |