内蒙古东部阿荣旗地区晚白垩世孤山镇组的建立

Guangrui SUN,Huanli ZHAO,Yandong HAN,Jiangshui MA,Xuguang LIU,Huanyu SHA,Shiqiang ZHOU,Liling MA

GEOLOGICAL BULLETIN OF CHINA（2005）

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Abstract

通过1:25万阿荣旗幅地质调查,在阿荣旗孤山镇-东亚东镇一带发现一套酸-中酸碱性火山岩石组合,时代为晚白垩世,将其新建岩石地层单位--孤山镇组.孤山镇组主要分布于大杨树盆地南部,由流纹岩、流纹质火山碎屑岩、粗面岩和英安岩组成,上覆地层为嫩江组,下伏地层为甘河组.岩石高碱(Na2O+K2O=7.83%～10.28%),属酸碱性系列.轻稀元素土富集,δEu=0.39～1.07;Nb、Ta基本无亏损,P、Ti强烈亏损,可能形成于陆内断陷盆地活动结束时期.

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Key words

late cretaceous gushanzhen formation,eastern inner mongoliachina,arun qi

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