| 摘要: |
| 晚新生代温泉沉积盆地,是青藏高原腹地在南北向挤压、东西向伸展的构造背景下,沿南北向边界走滑断层,经边界正断层和内部张剪断层的进一步发展而形成的近南北向单断单剪楔形半地堑活动沉积盆地。它可能代表了晚新生代青藏高原第三期强烈挤压隆升事件,是侧向向东剪切挤出的结果。笔者以盆地充填序列和TL、ESR测年资料为主要依据,推测唐古拉山在300~250ka前后全面进入冰冻圈;而以温泉活动沉积盆地为代表的中更新世晚期(224.0~150.2ka)的冰碛-冰水堆积则对应于青藏高原第三期隆升的断陷盆地发育阶段;中更新世晚期—晚更新世中期(144.0~56ka)为湖相沉积;晚更新世中期至今(35~0ka)对应于高原缓慢隆升与夷平发育阶段。长江溯源在35ka切割通天河盆地,形成通天河;而在16ka侵蚀切穿雁石坪-温泉兵站峡谷,形成布曲河。 |
| 关键词: 晚新生代 活动沉积盆地 温泉盆地 青藏高原 |
| DOI： |
| 附件 |
| 投稿时间：2004-07-06修订日期：2005-01-06 |
| 基金项目:中国地质调查局1:25万温泉兵站幅区域地质调查(I46C003002),国家自然科学基金(403720847),国家自然科学基金(40202022)。 |
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| Sedimentary characteristics in the Wenquan Basin on the northern Qinghai-Xizang Plateau and their geological implications |
| DUAN Zhi-ming, LI Yong, LI Ya-lin, ZHANG Yi, WANG Mou, LI Bing |
| (Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China) |
| Abstract: |
| The Late Cenozoic Wenquan Basin is interpreted as a half graben active sedimentary basin created from the NS-trending compression and EW-trending extension of the hinterland of the Qinghai-Xizang Plateau. The basin has recorded the Late Cenozoic uplifting of the Plateau and lateral shearing and expulsion, and is always controlled by the Tanggulabingzhan boundary fault. The middle Pleistocene (224.0-150.2 ka BP) glacial deposits and glaciofluvial deposits represented by the basin as a fault basin was responded to the third phase of the uplifting of the Plateau. During the late stage of the middle Pleistocene to the early stage of the late Pleistocene (144.0-56 ka BP), the lacustrine deposits were accentuated in the basin. From the middle stage of the late Pleistocene to the present (35-0 ka BP), the Plateau has long been subjected to slow uplifting and peneplanation. |
| Key words: Late Cenozoic active sedimentary basin Wenquan Basin Qinghai-Xizang Plateau |
