摘要
通过对总长2 705m两条剖面的实测、40块薄片鉴定、419个砾石统计及其粒度分析,确定了辽西地区北票盆地中侏罗统海房沟组砾岩的沉积特征及成因。研究表明:辽西北票盆地海房沟组主要岩性为一套冲积扇相的复成分砾岩,并夹一套喷溢相下部亚相安山质角砾熔岩和另一套爆发相空落亚相安山质角砾凝灰岩、热碎屑流亚相安山质角砾凝灰熔岩;海房沟组沉积物源来自研究区SSW向的太古宇变质岩及结晶基底和下侏罗统兴隆沟组火山岩的全面快速隆升剥蚀。结合构造背景,通过对北票组与海房沟组界线的研究和岩性岩相的鉴定,确定海房沟组冲积扇相的复成分砾岩是燕山运动二期挤压伸展构造运动的重要产物,两套中酸性火山岩的出现是两次火山喷发的重要标识。
The sedimentary characteristics and genesis of the Middle Jurassic conglomerates in Haifanggou Formation were determined by measuring the 2 705 mlong two sections,identifying 40 micro-sections,and analyzing 419 gravel statistical particle size in Beipiao basin in western Liaoning.The main lithology of Haifanggou Formation in the northwest Liaoning is a set of compound conglomerate which is an alluvial fan facies including two series of intermediate-acid volcanic rocks,namely the lower effusive facies,air-fall and pyro-clastic flow deposit of explosive facies.The source of Haifanggou Formation is from the SSW area,where the Archaean metamorphic rock,crystalline basement and the volcanic rocks of Xinglonggou Formation in the Lower Jurassic were generally rapidly uplift and denuded.Based on the study of the tectonic setting of the area,the boundary between Beipiao Formation and Haifanggou Formation and the sedimentary characteristics of Haifanggou Formation,the multicomponent conglomerate is an important product of the tectonic movement of compression and extension in the second phase of Yanshanian movement,and the two series of intermediate-acid volcanic rocks are the important indicators of volcanic eruption.
作者
赵佳琦
高有峰
刘海波
王清斌
张艳
王璞珺
Zhao Jiaqi;Gao Youfeng;Liu Haibo;Wang Qingbin;Zhang Yan;Wang Pujun(College of Earth Sciences , Jilin University , Changchun 130061 ,China;Key Laboratory for Evolution of Life and Environment in Northeast Asia (Jilin University ),Ministry of Education , Changchun 130026 China;Research Center of Paleontology and Stratigraphy , Jilin University , Changchun 130026 , China;Tianjin Branch of CNOOC China Ltd., Tianjin 300459,China)
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2019年第3期650-661,共12页
Journal of Jilin University：Earth Science Edition
基金
中海石油(中国)有限公司天津分公司攻关项目(CCL2018TJXSWST0084)
国家重点研发计划项目(2017YFC0601405)~~
关键词
海房沟组
岩相
砾石统计
沉积特征
物源
古流向
燕山运动
北票盆地
Haifanggou Formation
lithofacies
gravel statistics
sedimentary characteristics
provenance
paleo-current
Yanshanian movement
Beipiao basin
