青藏高原北缘的隆升时期——来自阿尔金山和柴达木盆地的证据  

Uplift period of the northern margin of the Qinghai-Tibet Plateau:evidences from the Altyn Mountains and Qaidam Basin

作　　者：袁四化[1] 刘永江[2] 葛肖虹[2] 吴光大[3] 胡勇[3] 郭新转[2] 李伟民[2] 

机构地区：[1]成都地质矿产研究所,四川成都610082 [2]吉林大学地球科学学院,吉林长春130061 [3]中石油青海油田分公司勘探开发研究院,甘肃敦煌736200

出　　处：《岩石矿物学杂志》2008年第5期413-421,共9页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(40572135);国家教委高等学校博士学科点专项科研基金资助项目(20040183055)

摘　　要：根据柴达木盆地西部中新世上、下油砂山组的沉积特征及其地震反射界面的特征,推断阿尔金山的主隆升时期为中晚中新世,山体的隆升导致盆地沉积中心向东迁移。盆地周缘山系的隆升年代学资料也表明,青藏高原北缘在中晚中新世发生了快速抬升,与青藏高原南部的同期区域构造事件一致,表明中晚中新世是青藏高原向北生长的重要时期。阿尔金山此次隆升事件与塔里木板块向柴达木地块楔入有关,整个高原的隆升动力源自印度板块与欧亚大陆拼合后持续向北的俯冲。An analysis of sedimentary characteristics of Shangyoushashan and Xiayoushashan Formations and the features of seismic reflection in western Qaidam Basin suggest that the Altyn Mountains were uplifted during the Mid-Late Miocene, which resulted in an eastward migration of the basin depocenter. Uplifting chronological data from the surrounding mountains also indicate that the uplifting of the northern margin of the Qinghai-Tibet Plateau was coincident with the regional tectonic events of southern Qinghai-Tibet Plateau during the Mid-Late Miocene. It is also demonstrated that the Mid-Late Miocene is an important period for the northward growth of Qinghai-Tibet Plateau. The uplift event of the Altyn Mountains was directly related to the wedging of the Tarim Plate underneath the Qaidam Plate. The plateau uplifting dynamic source was derived from the continuous northward subduction of the India Plate after its collision with the Eurasia continent.

关 键 词：柴达木盆地 阿尔金山 青藏高原北缘 隆升 

分 类 号：P542[天文地球—构造地质学] P534[天文地球—地质学]