| 老挝琅勃拉邦构造带石英闪长岩锆石U-Pb定年:古特提斯洋东向俯冲启示 |
| |
| 引用本文： | 郭林楠,侯林,聂飞,刘书生,徐思维,张启明.老挝琅勃拉邦构造带石英闪长岩锆石U-Pb定年:古特提斯洋东向俯冲启示[J].沉积与特提斯地质,2020,40(1):68-75. |
| |
| 作者姓名： | 郭林楠 侯林 聂飞 刘书生 徐思维 张启明 |
| |
| 作者单位： | 中国地质调查局成都地质调查中心, 四川 成都 610081 |
| |
| 基金项目： | 本研究得到中国地质调查局地质调查项目“东南亚大型锡铜金矿资源基地评价冶（DD2019444）、“老挝、柬埔寨及邻区矿产资源潜力评价冶（DD20160107）的资助。 |
| |
| 摘 要： | 老挝琅勃拉邦构造带位于印支板块西部,是东南亚特提斯域内的重要构造带之一。该地区多期次的岩浆活动记录了多阶段的构造岩浆演化,但与古特提斯洋闭合过程相关的岩浆活动报道相对较少,导致与该过程相关的构造-岩浆-成矿作用关系理解不清。本文在野外地质观察和岩相学研究的基础上,对老挝琅勃拉邦地区石英闪长岩开展了锆石U-Pb LA-ICP-MS定年,分析结果表明,石英闪长岩结晶年龄为260.5±1.8 Ma,表明琅勃拉邦构造带存在中晚二叠世岩浆活动。结合前人研究结果,本文认为该中酸性侵入体很可能是古特提斯洋板片东向俯冲,难河-沙缴弧后盆地关闭过程中岩浆活动的产物,且为琅勃拉邦构造带向南连接至难河-程逸结合带提供了新资料。
|
| 关 键 词： | 锆石U-Pb定年 琅勃拉邦构造带 石英闪长岩 古特提斯洋 |
| 收稿时间： | 2019/10/21 0:00:00 |
| 修稿时间： | 2020/1/2 0:00:00 |
Zircon U-Pb dating of quartz-diorite from Luang Prabang tectonic belt in Laos: Implication for eastward subduction of the Paleo-Tethys Ocean |
| |
| GUO Linnan,HOU Lin,NIE Fei,LIU Shusheng,Xu Siwei,ZHANG Qiming.Zircon U-Pb dating of quartz-diorite from Luang Prabang tectonic belt in Laos: Implication for eastward subduction of the Paleo-Tethys Ocean[J].Sedimentary Geology and Tethyan Geology,2020,40(1):68-75. |
| |
| Authors: | GUO Linnan HOU Lin NIE Fei LIU Shusheng Xu Siwei ZHANG Qiming |
| |
| Institution: | Chengdu Center, China Geological Survey, Chengdu 610081, China |
| |
| Abstract: | The Luang Prabang tectonic belt in Laos is located in the western of Indo-China Plate, and it is one of the important tectonic belts in Southeast Asia-Tethys domain. Multi-stage magmatic activities in this area recorded multi-stage tectonic-magmatic evolutions. However, there are few reports on magmatic activity related to the closure process of Paleo-Tethys Ocean, thus the relationship of tectonic evolution-magmatism-metallogenesis in the process remain controversial. Based on field geological observations and petrographic studies, this article carried out zircon U-Pb LA-ICP-MS dating of quartz diorite in Luang Prabang, Laos. The results show that the crystalline age of the quartz diorite is 260.5±1.8 Ma, indicating a Middle-Late Permian magmatic activity in the Luang Prabang tectonic belt. Combine with previous studies, we believe the medium-acid intrusive rock is likely to be the product of magmatic activity during the eastward subduction of the Paleo-Tethys Ocean-plate and closure of the Nan-Sra Kaeo backarc basin. It also provides new data indicating that the Luang Prabang tectonic zone may link to the Nan-Uttaradit to the south. |
| |
| Keywords: | Zircon U-Pb dating Luang Prabang tectonic zone Quartz diorite Paleo-Tethys Ocean |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《沉积与特提斯地质》浏览原始摘要信息 |
| 点击此处可从《沉积与特提斯地质》下载免费的PDF全文 |
|
