古新世—中新世以来青藏高原北缘隆升的特征——来自可可西里盆地的报告  

Characteristics of North of Tibetap Plateau Uplift at Paleocene-Miocene——The Evidence from Ke Kexili Basin

作　　者：蔡雄飞[1] 刘德民[1] 魏启荣[1] 顾延生[1] 袁晏明[1] 李德威[1] 王国灿[1] 罗中杰[1] 

机构地区：[1]中国地质大学地球科学学院,武汉430074

出　　处：《地质学报》2008年第2期194-203,I0003,I0004,共12页Acta Geologica Sinica

基　　金：中国地质调查局1:25万不冻泉幅;库塞湖幅调查项目(编号200313000005)资助的成果

摘　　要：关于青藏高原隆升的时间有45Ma、32Ma、14Ma等见解,一直存在争议。本文以青藏高原腹地最大的红色盆地可可西里为例,从古新世—中新世时期的沉积、生物、火山岩的特征等诸多方面,阐述青藏高原显著开始隆升的时间、表现特点和作用,并认为中新世初期,青藏高原有一次强烈的降温事件;在物质组分上,以钙质粘土、埃达克(Adakitic)火山岩为主;生物上以寒冷、干旱标志的裸子植物为主的植硅体;中新世中期之后青藏高原全面抬升。There have long been controversies with the precise time of the Qinghai-Tibetan Plateau uplifting, and the dating data are 45Ma, 32Ma and 14Ma, respectively. This paper takes the Ke Kexili Basin——he largest red basin in the hinterland of the Qinghai-Tibet Plateau as an example to study the time of the the Qinghai-Tibetan Plateau lifting, its features and effects in terms of sediments, biology and volcanic rocks since the Paleocene-Miocene. Our study indicates that there was a decreasing event in temperature occurring at the plateau in the Paleocene-Miocene. The composition is characterized by calcilutite and adakitic rock; the organism by phytolith composing mainly of gymnosperm. The Qinghai-Tibet Plateau was being lifted since the Middle Miocene.

关 键 词：青藏高原隆升 植硅体 可可西里盆地 古新世—中新世 

分 类 号：P542[天文地球—构造地质学]