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西藏比如盆地竟柱山组沉积-火山岩形成环境及构造意义
引用本文:和钟铧,杨德明,王天武,黄应聪. 西藏比如盆地竟柱山组沉积-火山岩形成环境及构造意义[J]. 沉积与特提斯地质, 2006, 26(1): 8-12
作者姓名:和钟铧  杨德明  王天武  黄应聪
作者单位:吉林大学,地球科学学院,吉林,长春,130026
基金项目:中国地质调查局“1∶25万门巴区幅地质调查项目(H46002002)”
摘    要:上白垩统竟柱山组为一套冲积扇-扇三角洲沉积体系的粗碎屑岩,间夹由英安岩、安山岩、石英粗安岩和流纹岩组成的中酸性火山岩。火山岩呈层状、似层状产出,与碎屑岩均呈整合接触关系。地球化学特征表明,竟柱山组火山岩形成于岛弧构造环境,是挤压背景下地壳增厚熔融的产物。竟柱山组沉积-火山岩的形成环境揭示了比如盆地的性质在晚白垩世已由弧后盆地转换为前陆盆地。

关 键 词:上白垩统  竟柱山组  沉积-火山岩  比如盆地  西藏
文章编号:1009-3850(2006)01-0008-05
收稿时间:2006-01-16
修稿时间:2006-01-16

Tectonic setting and significance of the sedimentary-volcanic rocks from the Jingzhushan Formation in the Biru Basin,Xizang
HE Zhong-hu,YANG De-ming,WANG Tian-wu,HUANG Ying-cong. Tectonic setting and significance of the sedimentary-volcanic rocks from the Jingzhushan Formation in the Biru Basin,Xizang[J]. Sedimentary Geology and Tethyan Geology, 2006, 26(1): 8-12
Authors:HE Zhong-hu  YANG De-ming  WANG Tian-wu  HUANG Ying-cong
Affiliation:Faculty of Earth Sciences, Jilin University, Changchun 130026, Jilin , China
Abstract:The Upper Cretaceous Jingzhushan Formation in the Biru Basin,Xizang consists of a succession of coarse-grained clastic rocks in the alluvial fan-fan delta depositional system,intercalated with intermediate-acidic volcanic rocks including dacite,andesite,quartz trachyandesite and rhyolite.These volcanic rocks occur as stratified or stratoid beds,and are in conformable contact with the clastic rocks.The geochemical signatures show that the volcanic rocks in the Jingzhushan Formation were formed in the island-arc environment as crustal thickening-melting products in a compressional tectonic setting.The Biru Basin developed into a foreland basin during the Late Cretaceous.
Keywords:Upper Cretaceous  Jingzhushan Formation  sedimentaryvolcanic rocks  Biru Basin  Xizang
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