西藏措勤地区的中新世布嘎寺组  

Miocene Bugasi Formation: a new lithostratic unit in Coqen area, Tibet, China

作　　者：石和[1] 马润则[1] 刘登忠[1] 陶晓风[1] 胡新伟[1] 

机构地区：[1]成都理工大学地球科学学院,成都610059

出　　处：《成都理工大学学报（自然科学版）》2005年第2期173-176,共4页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国地质调查局资助项目(20001300009171)

摘　　要：分布于西藏措勤县城北西江若拉一带的富钾火山岩曾被划属达多群,地层时代属古新世至始新世。作者测制了这套火山岩地层的剖面,获得的同位素年龄为15.8 Ma和15.9 Ma,属中新世。这一发现填补了冈底斯山北部中新世富钾质岩浆活动的空白,为进一步研究青藏高原形成和演化提供了重要资料。根据岩性组合、地层时代及区域地层对比,将这一套中新世的富钾火山岩地层命名为布嘎寺组。The potassium-rich volcanic rock distributed over Jiangruola in Coqen area, Tibet, was originally assigned to the Daduo Group and the age was Paleocene-Eocene during the regional geological surveys of the (1∶1 000 000) Xigaze sheet. During the regional geological surveys of the (1∶250 000) Coqen sheet, a section of the potassium-rich volcanic rock was measured and the isotopic ages of (15.8) Ma and (15.9) Ma were obtained. Its age is Miocene. This discovery provides the occurrence of the Miocene potassium-rich magmatic activity in the northern part of the Qandise belt and provides important data for the further study of the formation and evolution of the Qinghai-Tibet Plateau. Based on the volcanic rock association, the age and the regional stratigraphical correlation, the potassium-rich volcanic rock of Miocene distributed over Jiangruola is named as Bugasi Formation.

关 键 词：措勘 富钾火山岩 区域地质调查 中新世 布嘎寺组 

分 类 号：P534.621[天文地球—古生物学与地层学]