| 柴北缘东段新生代沉积记录的南祁连构造隆升 |
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| 引用本文：钱涛,李王鹏,高万里,何玮东,江万,郭迎春,盛美.2025.柴北缘东段新生代沉积记录的南祁连构造隆升[J].地球学报,46(6):1067-1081. |
| DOI：10.3975/cagsb.2025.101621 |
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| 基金项目:中国地质科学院基本科研业务费项目(编号: DZLXJK202409; JKYZD202409); 中国地质调查局地质调查项目(编号: DD20230900110) |
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| 中文摘要:新生代以来, 柴达木盆地北缘(柴北缘)南祁连山在印度与欧亚大陆持续汇聚作用下发生了构造隆升, 其形成对深入认识陆-陆碰撞产生的远程效应如何影响大陆内部变形具有重要意义。本文通过系统开展南祁连山上干柴沟组—下油砂山组(中中新世)砾岩的沉积学特征、地层序列特征、古水流恢复及碎屑锆石U-Pb年龄组成等工作, 指出上干柴沟组—下油砂山组砾岩为柴北缘东段南祁连山同构造变形的沉积响应且碎屑物质主要剥蚀自祁连山。在新的年代地层框架里, 南祁连山在中中新世发生一次强烈的构造隆升活动, 导致柴达木盆地的变形与改造。 |
| 中文关键词:柴达木盆地 南祁连 新生代 构造隆升 |
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| South Qilian Tectonic Uplift in the Eastern Segment of the Northern Qaidam Basin Recorded by the Cenozoic Sediments |
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| Abstract:Since the Cenozoic, the South Qilian Range to the northern Qaidam Basin has undergone tectonic uplift due to an ongoing convergence between the Indian and Eurasian blocks. This activity provides important insights into the influence of far-field effects of continent-continent collisions on intra-continental deformation. In this study, based on an integration of the sedimentary characteristics of the conglomerate of the Shangganchai-gou–Xiayoushashan Formation (Middle Miocene), stratigraphic architecture, paleocurrent reconstruction, and detrital zircon U-Pb age spectra, we demonstrate that the conglomerate of the Shangganchai-gou–Xiayoushashan Formation represents syn-tectonic sedimentation responding to deformation of the South Qilian Range to the eastern segment of the northern Qaidam Basin, and that detritus is mainly sourced from the Qilianshan Range. Within the new geochronological framework, our findings indicate that during the Middle Miocene, intense tectonic uplift occurred in the South Qilian Range, triggering deformation and structural reorganization of the Qaidam Basin. |
| keywords:Qaidam Basin South Qilian Range Cenozoic tectonic uplift |
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