| 辽西上白垩统大兴庄组地层层序及时代 |
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| 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. |
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| 作者姓名： | 邴志波 刘文海 黄志安 张福生 |
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| 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 |
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| 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。 |
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| 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。
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| 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年1月10日 |
Stratigraphic sequence and age of the Upper Cretaceous Daxingzhuang Formation in western Liaoning province |
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| BING Zhibo,LIU Wenhai,HUANG Zhian,ZHANG Fusheng.Stratigraphic sequence and age of the Upper Cretaceous Daxingzhuang Formation in western Liaoning province[J].Geologcal Bulletin OF China,2003,22(5):351-355. |
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| Authors: | BING Zhibo LIU Wenhai HUANG Zhian ZHANG Fusheng |
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| 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. |
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| Keywords: | western Liaoning Upper Cretaceous Daxingzhuang Formation |
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