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| 龙木错—双湖—吉塘板块缝合带与青藏高原冈瓦纳北界 | |
| 引用本文： | 李才,黄小鹏,翟庆国,朱同兴,于远山,王根厚,曾庆高.龙木错—双湖—吉塘板块缝合带与青藏高原冈瓦纳北界[J].地学前缘,2006,13(4):136-147. |
| 作者姓名： | 李才 黄小鹏 翟庆国 朱同兴 于远山 王根厚 曾庆高 |
| 作者单位： | 1. 吉林大学,地球科学学院,吉林,长春,130061 2. 吉林大学,地球科学学院,吉林,长春,130061;中国地质科学院,地质研究所,北京,100037 3. 成都地质矿产研究所,四川,成都,610082 4. 中国地质大学(北京),北京,100083 5. 西藏自治区地质调查院,西藏,拉萨,850000 |
| 基金项目： | 中国地质调查局科研项目 |
| 摘 要： | 青藏高原上冈瓦纳北界的讨论由来已久,随着基础地质研究程度的提高,羌塘地区成为解决冈瓦纳北界问题的关键地区。根据对缝合带的研究,青藏高原发育三条大规模的印支期缝合带,并将青藏高原分为三大板块:昆仑—秦岭缝合带以北为塔里木—华北板块,昆仑—秦岭缝合带与龙木错—双湖—吉塘缝合带之间为扬子板块,龙木错—双湖—吉塘缝合带以南为冈瓦纳板块。西金乌兰—金沙江缝合带是发育在扬子板块内部的印支期缝合带,班公湖—怒江和印度河—雅鲁藏布江缝合带是发育在冈瓦纳大陆框架下新特提斯阶段的缝合带,构不成冈瓦纳北界。文中简要介绍龙木错—双湖—吉塘缝合带的基本事实,着重阐述该缝合带对冈瓦纳板块和扬子板块的基底、沉积盖层与生物地理、沉积建造和构造运动等方面的制约。在青藏高原印支期主要板块缝合带的对比研究基础上,笔者认为龙木错—双湖—吉塘缝合带作为青藏高原上冈瓦纳大陆的北界是符合客观实际的。 |
| 关 键 词： | 青藏高原 羌塘 龙木错—双湖—吉塘 板块缝合带 冈瓦纳大陆北界 |
| 文章编号： | 1005-2321（2006）04-0136-12 |
| 收稿时间： | 2005-12-28 |
| 修稿时间： | 2006-05-15 |
The Longmu Co-Shuanghu-Jitang plate suture and the northern boundary of Gondwanaland in the Qinghai-Tibet plateau |
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| LI Cai,HUANG Xiao-peng,ZHAI Qing-guo,ZHU Tong-xing,YU Yuan-shan,WANG Gen-hou,ZENG Qing-gao.The Longmu Co-Shuanghu-Jitang plate suture and the northern boundary of Gondwanaland in the Qinghai-Tibet plateau[J].Earth Science Frontiers,2006,13(4):136-147. | |
| Authors: | LI Cai HUANG Xiao-peng ZHAI Qing-guo ZHU Tong-xing YU Yuan-shan WANG Gen-hou ZENG Qing-gao |
| Institution: | 1, College of Earth Science, J ilin University, Changchun 130061 ,China 2. Institute of Geology, Chinese Academy of Geological Sciences ,Beijing 100037, China 3. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China 4. China University of Geosciences , Beijing 100083, China 5. Institute of Geology Survey of Tibet Autonomous Region, Lhasa 850000, China |
| Abstract: | The location of the northern boundary of Gondwanaland has been a topic of discussion for many years. As geologic research on Qinghai-Tibet plateau has progressed, Qiangtang has become the key area for resolving this problem. According to published data, there are three Indosinian plate sutures in the plateau, which divide it into three structural domains. They are the Tarim-North China domain north of the Kunlun- Qinling suture, the Yangtze domain between the Kunlun-Qinling and Longmu Co-Shuanghu-Jitang sutures, and the Gondwanaland domain south of the Longmu Co-Shuanghu-Jitang suture. We consider the Xijinwulan- Jinshajiang suture as an additional Indosinian suture which developed within the Yangtze plate. The Bangong Co-Nujiang and Yarlung Zangbo sutures developed within the Gondwanaland domain, but neither can be con- sidered to define the northern boundary of Gondwanaland. We disscuss the Longmu Co-Shuanghu-Jitang suture and its relationships to the geology of the Gondwanaland and Yantze domains. Based on our comparative study of the Indosinian sutures, we consider the Longmu Co-Shuanghu-Jitang suture to define the Neopaleozoic northern boundary of Gondwanaland. |
| Keywords: | Qinghai-Tibet plateaus Qiangtang Longmu Co-Shuanghu-Jitang Indosinian sutures northern boundary of Gondwanaland |
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