| 塔里木南缘煌斑岩的时代及其地质意义 |
| |
| 引用本文： | 郭坤一,张传林,赵宇,董永观,王爱国.塔里木南缘煌斑岩的时代及其地质意义[J].地质科学,2003,38(4):532-534,518. |
| |
| 作者姓名： | 郭坤一 张传林 赵宇 董永观 王爱国 |
| |
| 作者单位： | 国土资源部南京地质矿产研究所 南京 210016 |
| |
| 基金项目： | 中国地质调查局“西昆仑地区综合找矿预测”项目 (K 1 3 3 3 )部分成果 |
| |
| 摘 要： | 在塔里木南缘皮山县境内发现东西向煌斑岩带,它们呈脉状产出,围岩为前寒武纪绢云绿泥石英片岩、变质粉砂岩及石炭纪玄武岩、结晶灰岩等。岩石地球化学特征与典型地区的钾镁煌斑岩相似。从煌斑岩中挑选的金云母经ArAr测年,获得理想的坪年龄为217.65±0.39Ma,40Ar/36Ar39Ar/36Ar等时线年龄为217.27±1.38Ma,与坪年龄一致。这一年龄值代表了煌斑岩的形成时代,与阿尔金断裂形成时代基本一致,它代表了塔里木南缘在这一时期重要的走滑事件。煌斑岩带的发现,对塔里木南缘的金刚石找矿勘查具有重要意义。
|
| 关 键 词： | 40Ar-39Ar年龄 煌斑岩 塔里木南缘 |
| 文章编号： | 0563-5020(2003)04-0532-03 |
| 收稿时间： | 2002-01-28 |
| 修稿时间： | 2002-01-28; |
40Ar-39Ar DATING OF LAMPROITE ALONG SOUTH MARGIN OF THE TARIM PLATFORM AND ITS GEOLOGIC SIGNIFICANCE |
| |
| Guo Kunyi,Zhang Chuanlin,Zhao Yu,Dong Yongguan,Wang Aiguo.40Ar-39Ar DATING OF LAMPROITE ALONG SOUTH MARGIN OF THE TARIM PLATFORM AND ITS GEOLOGIC SIGNIFICANCE[J].Chinese Journal of Geology,2003,38(4):532-534,518. |
| |
| Authors: | Guo Kunyi Zhang Chuanlin Zhao Yu Dong Yongguan Wang Aiguo |
| |
| Institution: | Nanjing Institute of Geology and Mineral Resources, Ministry of Land and Resources, Nanjing 210016 |
| |
| Abstract: | A lamproite belt was found along south margin of the Tarim platform. The lamproite outcroped as dyke occurring in the Precambrian schists and the Carboniferous limestone and basalt. The phlogopite from the lamproite yielded a plateau age of 217.65±0.39 Ma and 40Ar/36Ar-39Ar/36Ar isochron age of 217.27±1.38 Ma. The both represented forming age of the Altyn fault (220～240 Ma ago), namely, an important strike slipping event related to collision between the Qiangtang Block and west Kunlun. The discovery of the lamproite belt might be helpful to exploration of diamond deposits in the southern margin of Tarim. |
| |
| Keywords: | Ar 39 Ar plateau age of 217 Ma Lamproite South margin of the Tarim platform |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地质科学》浏览原始摘要信息 |
| 点击此处可从《地质科学》下载免费的PDF全文 |
|
