The Longmu Co-Shuanghu-Jitang plate suture and the northern boundary of Gondwanaland in the Qinghai-Tibet plateau
The Longmu Co-Shuanghu-Jitang plate suture and the northern boundary of Gondwanaland in the Qinghai-Tibet plateau
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作者：
L. Cai
多年来，冈瓦瓦兰北部边界的位置一直是一个讨论的话题。随着青藏高原地质研究的深入，羌塘已成为解决这一问题的重点地区。根据已发表的资料，青藏高原存在三条印支板块缝合带，将其划分为三个构造域。它们是昆仑-秦岭缝合带以北的塔里木-北中国域，昆仑-秦岭与龙目-双湖-集塘缝合带之间的扬子域，以及龙目-双湖-集塘缝合带以南的冈瓦瓦兰域。我们认为西金乌兰-金沙江缝合带是扬子板块内部发育的印支附加缝合带。班公湖怒江缝合带和雅鲁藏布江缝合带发育在冈瓦地区，但都不能被认为是冈瓦地区的北界。讨论了龙目-双湖-集塘缝合带及其与冈瓦华兰和扬子地区地质的关系。在印支缝合带对比研究的基础上，我们认为龙目湖-双湖-集塘缝合带可以确定冈瓦纳兰地区新古生界的北界。
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 considered 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.