Response of the Neogene Sedimentary Paleocurrent and Provenance Distribution to Uplift of the Northeastern Qinghai-Tibetan Plateau
详细信息
- 责任者：Yang Yongfeng (Key Laboratory of Biological and Environmental Geology ; China University of Geosciences ; Wuhan 430074 ; China) ; Zhang Kexin
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(6)
- 关键词：古水流 ; paleocurrents ; 物源分析 ; provenance analysis ; 盆地演化 ; basin evolution ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.797-813
- 图表：illus., 1 table, 46 refs.
- 分类号：0803
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Based on paleocurrent and provenance analysis of Neogene sedimentary basins in the Northeastern Qinghai-Tibetan Plateau , sedimentary evolution responsing to tectonic uplift can be divided into four processes : ① During Early Miocene ( 23～19.5 Ma ): paleocurrent and provenance analysis of the Ayakkum , Qaidam , Delingha and Jiuquan Basin show that the East Kunlun and Altyn area had uplifted into land.The evidence from the Xunhua , Guide and Linxia Basin indicate that the Western Qinling and Lajishan area was also main uplift area.At the same time , thermochronological data of the Altyn area contrasts well with sedimentary record.Overall , the terrain was not outstanding.② During early Middle Miocene ( 17.5～15 Ma ), the sedimentary basins expanded , the Xorkol Basin appeared , and data from these basins reflect the mountain ridge , including the Eastern Kunlun , Altyn , Qilian , Western Qinling and Lijishan , uplifted significantly.Regional differential uplift caused expansion of these basins.③ In Late Miocene ( 10～7 Ma ), the granularity and sedimentary rate of these basins increased abruptly , indicated a rapid uplift of the surrounding mountains , consistent with thermochronological evidence of the Altyn , Qilian and Western Qinling.However , paleocurrent and provenance data of the Guide , Xunhua and Linxia Basin show a sensible multi-source , and paleocurrent in the Xigou area turned to NWW , inferring uplift of the Jishishan Mountain.④ During Pliocene ( since 5.3 Ma onwards ), paleocurrent directions in the research area remained unchanged , but granularity and sedimentary rate continued to increase , The uplift of Altyn and Qilian Mountain accelerated rapidly.Paleocurrent of the northern Guide Basin was SSW , indicating the Lajishan Mountain was regional source area.Overall , the terrain differences strengthened in this area , and the sedimentary basins shrank and withered away gradually.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |