摘要
羌塘处于青藏高原腹地,在大地构造上以龙木错—双湖缝合带(羌塘中央隆起带)为界划分为羌南和羌北两个地块。羌塘中部的蛇绿混杂岩、高压变质岩以及弧岩浆岩等方面的大量前期研究表明,龙木错—双湖古特提斯洋至少从寒武纪打开、持续或阶段性演化到三叠纪,使得羌南和羌北在古生代期间分属于冈瓦纳与劳亚大陆体系。在综述前人研究基础上,系统总结了羌塘中央隆起带古生界的物质组成、时空分布特征以及地层的划分与对比情况。通过梳理研究发现,羌南和羌北的古生界沉积记录相对完整和连续,但研究程度仍明显偏低,南、北羌塘古生代盆地充填与演化研究明显不足,有关龙木错—双湖古特提斯洋及两侧大陆边缘的演化历史并不清楚,羌塘盆地结构与构造属性与羌塘油气远景评价等基础地质工作亟须开展。开展羌塘古生界研究,不仅能有效揭示古特提斯洋的演化历史,对重塑古特提斯洋-陆构造格局具有重要约束意义,同时,对认识羌塘盆地基底性质与结构、进行羌塘油气资源调查等具有重要的实践指导意义。
The Qiangtang region,situated in the hinterland of the Qinghai-Xizang Plateau,is tectonically divided into the South Qiangtang and North Qiangtang Terranes by the Longmu Co-Shuanghu Suture Zone(Central Qiangtang Uplift Zone).Previous studies,based on extensive investigations of ophiolitic mélanges,high-pressure metamorphic rocks,and arc magmatic rocks,have demonstrated that the Paleo-Tethys Ocean in the Longmu Co-Shuanghu area opened at least during the Cambrian and evolved continuously or episodically until the Triassic.This tectonic evolution resulted in the separation of South and North Qiangtang into the Gondwana and Laurasia continental systems,respectively,during the Paleozoic.Building upon a synthesis of prior research,this research systematically summarizes the material composition,spatiotemporal distribution characteristics,and stratigraphic division and correlation of the Paleozoic sequences in the Central Qiangtang Uplift Zone.The review reveals that the Paleozoic sedimentary records in both South and North Qiangtang are relatively complete and continuous.However,the current level of research remains notably insufficient.Critical gaps persist in understanding the Paleozoic basin fill,evolutionary processes,and the tectonic history of the Longmu Co-Shuanghu Paleo-Tethys Ocean and its associated continental margins.Fundamental geological investigations-such as clarifying the basin architecture,tectonic attributes,and petroleum potential evaluation of the Qiangtang Basin are urgently required.This research contends that advancing research on the Qiangtang Paleozoic sequences will not only elucidate the evolutionary history of the Paleo-Tethys Ocean,but also provide critical constraints for reconstructing the ocean-continent tectonic framework of the Paleo-Tethyan regime.Furthermore,it holds significant practical implications for deciphering the basement properties and architecture of the Qiangtang Basin and guiding future hydrocarbon exploration in the region.
作者
解超明
史哲
段梦龙
陈红灿
徐铭蔚
白希泰
张家俊
XIE Chaoming;SHI Zhe;DUAN Menglong;CHEN Hongcan;XU Mingwei;BAI Xitai;ZHANG Jiajun(College of Earth Science,Jilin University,Changchun 130061,China;Research Center for Tibetan Plateau,Jilin University,Changchun 130061,China;Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Land and Resources of China,Changchun 130061,China;Xi’an Center,China Geological Survey〔Geosciences Innovation Center of Northwest China〕,Xi’an 710119,China)
出处
《西北大学学报(自然科学版)》
北大核心
2025年第3期501-522,共22页
Journal of Northwest University(Natural Science Edition)
基金
国家自然科学基金(41872231,42172226)。
关键词
青藏高原
羌塘
古生代
地层划分与对比
构造演化
the Qinghai-Xizang Plateau
the Qiangtang Basin
paleozoic
stratigraphic correlation
tectonic evolution
