| 内蒙古乌兰浩特古元古代变质岩系的发现及其地质意义 |
| |
| 引用本文： | 程招勋,汪岩,钱程,杨晓平,李中会,刘洪伟,肖林.内蒙古乌兰浩特古元古代变质岩系的发现及其地质意义[J].地质通报,2018,37(9):1599-1606. |
| |
| 作者姓名： | 程招勋 汪岩 钱程 杨晓平 李中会 刘洪伟 肖林 |
| |
| 作者单位： | 黑龙江省地质调查研究总院齐齐哈尔分院;中国地质调查局沈阳地质调查中心;黑龙江省齐齐哈尔矿产勘查开发总院 |
| |
| 基金项目： | 中国地质调查局项目《内蒙古1∶5万前公主陵等六幅区域地质调查》（编号：DD20160048-10） |
| |
| 摘 要： | 在乌兰浩特东白音乌苏一带新发现一套斜长角闪片岩、透辉透闪岩、斜长角闪片麻岩的岩石组合,岩石普遍经高绿片岩相-低角闪岩相变质,经受了后期多期构造改造。斜长角闪片岩经原岩恢复为基性火山岩,锆石晶形、阴极发光、背散射图像及高Th/U值等特征显示为岩浆锆石。采用LA-ICP-MS锆石U-Pb测年技术,在变质岩系中获得了1864.1±7.3Ma的同位素年龄,时代归属为古元古代,该年龄为岩浆形成年龄。此年龄限定了该套变质岩系的形成时代,证明乌兰浩特地区可能存在前寒武纪结晶基底。与区域上松嫩地块南部新发现的古元古元代岩浆锆石年龄进行对比发现,松嫩地块西缘可延伸至乌兰浩特一带。
|
| 关 键 词： | 乌兰浩特 古元古代 变质岩系 |
| 收稿时间： | 2018/5/20 0:00:00 |
| 修稿时间： | 2018/6/21 0:00:00 |
The discovery of the Paleoproterozoic metamorphic rocks in Ulanhot, Inner Mongolia, and its geological significance |
| |
| CHENG Zhaoxun,WANG Yan,QIAN Cheng,YANG Xiaoping,LI Zhonghui,LIU Hongwei and XIAO Lin.The discovery of the Paleoproterozoic metamorphic rocks in Ulanhot, Inner Mongolia, and its geological significance[J].Geologcal Bulletin OF China,2018,37(9):1599-1606. |
| |
| Authors: | CHENG Zhaoxun WANG Yan QIAN Cheng YANG Xiaoping LI Zhonghui LIU Hongwei and XIAO Lin |
| |
| Institution: | Qiqihar Branch of Heilongjiang Geological Survey Research Institute, Harbin 150036, Heilongjiang, China,Shenyang Institute of Geology and Mineral Resources, Shenyang 110034, Liaoning, China,Shenyang Institute of Geology and Mineral Resources, Shenyang 110034, Liaoning, China,Shenyang Institute of Geology and Mineral Resources, Shenyang 110034, Liaoning, China,Qiqihar Branch of Heilongjiang Geological Survey Research Institute, Harbin 150036, Heilongjiang, China,General Institute of Mineral Exploration and Development in Qiqihar, Qiqihar 161006, Heilongjiang, China and Qiqihar Branch of Heilongjiang Geological Survey Research Institute, Harbin 150036, Heilongjiang, China |
| |
| Abstract: | A set of amphibolite schist, diopside tremolite schist and amphibolite gneiss supracrustal rock assemblage was newly discov-ered in Dongbaiyinwusu area. The rocks have generally experienced high greenschist facies and low amphibolite facies metamorphism and the multiple tectonic transformation of plagioclase in later stage. The hornblende schist protolith comprised basic volcanic rocks, whose zircon crystal, cathodoluminescence, back scattering image and high Th/U ratio characteristics suggest magmatic zircon. By us-ing zircon U-Pb dating LA-ICP-MS technology, the authors obtained the isotopic age of 1864.1±7.3Ma, suggesting Paleoproterozo-ic and representing magma formation age, which constrains the formation age of supracrustal rocks and proves the existence of Precam-brian crystalline basement in Ulanhot area. A comparison with the Paleoproterozoic magmatic zircon ages of southern Songnen massif shows that the west margin of Songnen massif can extend to the Ulanhot area. |
| |
| Keywords: | Ulanhot Palaeoproterozoic metamorphic series |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
|
