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辽西上白垩统大兴庄组地层层序及时代
引用本文:邴志波 刘文海 黄志安 张福生. 辽西上白垩统大兴庄组地层层序及时代[J]. 地质通报, 2003, 22(5): 351-355.
作者姓名:邴志波 刘文海 黄志安 张福生
作者单位:[1]中国地质调查局沈阳地质矿产研究所,辽宁沈阳110032 [2]辽宁省地质勘查院,辽宁大连116100
基金项目:中国地质调查局“1∶25万锦州市幅区域地质调查”项目成果。
摘    要:辽宁西部白垩系上统大兴庄组主要分布于锦州、义县地区,在朝阳波罗赤、阜新碱锅等地也有零星出露。除阜新等地区为中基性火山熔岩及火山碎屑岩外,均为中酸性、酸性火山熔岩、熔岩碎屑岩、火山碎屑岩、火山碎屑沉积岩及次火山岩。角度不整合覆于白垩系下统义县组、九佛堂组、沙海组之上,平行不整合覆于白垩系孙家湾组之上,K—Ar同位素年龄值为80.83Ma,属晚白垩世。该期火山活动以爆发—喷溢交替进行为特点,间有次火山岩侵入,活动强度微弱,分布局限。

关 键 词:辽宁西部 上白垩统 大兴庄组
文章编号:1671-2552(2003)05-0351-05
修稿时间:2003-01-10

Stratigraphic sequence and age of the Upper Cretaceous Daxingzhuang Formation in western Liaoning province
BING Zhibo 1,LIU Wenhai 2,HUANG Zhian 2,ZHANG Fusheng 2. Stratigraphic sequence and age of the Upper Cretaceous Daxingzhuang Formation in western Liaoning province[J]. Geological Bulletin of China, 2003, 22(5): 351-355.
Authors:BING Zhibo  LIU Wenhai  HUANG Zhian  ZHANG Fusheng
Abstract:The Upper Cretaceous Daxingzhuang Formation in western Liaoning is mainly distributed in Jinzahou and Yixian and also outcrops sporadically in the Boluochi ,Chaoyang,and Jianguo,Fuxin.Ex-cept in the Fuxin area where it is composed of intermediate-basic lavas and pyroclastic rocks,in other ar-eas it consists of intermediate-acid and acid lavas,lava-clastic rocks,pyroclastic rocks,pyroclastic-sedi-mentary rocks and subvolcanic rocks.It lies unconformably on the Lower Cretaceous Yixian,Jiufutang and Sahai Formations and disconformably on the Cretaceous Sunjiawan Formation.Its K-Ar age is80.83Ma ,indicating a Late Cretaceous age.This phase of volcanism is characterized by alternating explosion and out-pouring.In the late phase subvolcanic rocks were in truded.The activity was weak and the distribution of the subvolcanic rocks is limited.
Keywords:western Liaoning  Upper Cretaceous  Daxingzhuang Formation  
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