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Three—Phase Uplift of the Qinghai—Tibet Plateau Druing the Cenozoic Period:Igneous Petrology Constraints

《中国地球化学学报:英文版》2000年 第2期 | 赖绍聪   DpeartmentofGeology NorthwestUniversity Xian710069 China
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摘 要:In northern Qinghai-Tibet Plateau there are developed Cenozoic volcanic rocks.They constitute a trachybaslt-shoshonite-latite-trachydacite assemblage.According to the forming ages,three Cenozoic volcanic rock lithozones can be distinguished in the northern part of the plateau.Cenozoic volcanic rocks and muscovite/wto-mica granites forming the three belts in pairs represent the northern and southern margins of the plateau in different peroids,In fact,tpe tectoinc setting of the northern part of the Qinghai-Tibet plateau in different periods,In fact,the tectonic setting of the northern part of the Qinghai-Tibet Plateau is significantly different from that of the southern part-Himalayas.The southern part has experienced subduction and continent-continent collsion.There are developed the Cenozoic S-type granites(muscovite/two-mica granites)there.But the northern part is characterized by Cenozoic basaltic magmatism which obviously somes from the upper mantle,Slight doming of the upper mantle is recognized underneath the northern part of the plateau,which is the result of resistance of the Tarim plate to the north direction-sense movement of the TIbertan plate.And at the same time,the uplift machanism shows that the formation of the Qinghai-Tibet plateau involved three oprogenic stages(35-23Ma,23-10Ma and <2 Ma) of uplift in the vertical direction and extension in the horizontal direction with the Gangdise-Qiangtan orogenic belt as its core.
【分 类】【天文学、地球科学】 > 地质学 > 岩石学 > 岩石分类 > 岩浆岩(火成岩)【天文学、地球科学】 > 地质学 > 构造地质学 > 构造运动 > 褶皱运动、造山运动
【关键词】 火成岩 浩山带 抬升作用 青海-西藏平原 新生代
【出 处】 《中国地球化学学报:英文版》2000年 第2期 152-160页 共9页
【收 录】 中文科技期刊数据库

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