摘要
沉积物中碎屑组分与重矿物的分布受物源区母岩性质、构造抬升与剥蚀作用及古环境等多种因素影响。通过研究渤海湾盆地辽西凹陷沙河街组断陷湖盆内部低凸起带物源区特征,及其对凹陷内部沉积体系的影响,依据砂岩碎屑组分及重矿物聚类分析识别母岩类型、颗粒表面结构分析推测搬运距离、稳定系数分析判定物源方向的研究思路,综合分析研究区内碎屑组分及重矿物数据的统计特征,认为母岩类型主要为岩浆岩和少量变质岩,分别对应于西部燕山隆起主物源、东部辽西低凸起南部隆起区次物源和北部隆起区弱物源。西部物源主要控制辽西凹陷的缓坡区沉积,东部物源的影响范围局限在辽西低凸起的陡坡带,北部物源对区内沉积的影响较弱。
The distribution of detrital composition and heavy minerals in deposits are subjected to the provenance, tectonic uplifting, and palaeoenvironment, etc.. In order to clarify the provenance of the Liaoxi sag in Bohaiwan Basin and the respective influence area in the sag, the research thought of the provenance analysis of heavy minerals is as follows. The cluster analysis determines source rock types; the surface texture of grains analysis determines the transportation distance; and the stability factor determines the transportatio,n direction. According to this thought, the whole heavy minerals data of the study area are processed. A comprehensive analysis of the mathematical statistics results shows that the source rock types of study area are mainly magmatie rock and few metamorphic rock, respectively responding to the west Yanshan Mountain primary provenance, and the south rise area secondary provenance and north rise area slight provenance in the Liaoxi low uplift. The west provenance controls the sedimentation of mild slope in the Liaoxi sag. The east provenance has limited influence area which covers the abrupt slope in the Liaoxi low uplift. The north provenance has slight influence on the sedimentation inside the area.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第2期171-176,共6页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家科技重大专项(2008ZX05023-002-001)
关键词
碎屑组分
重矿物
物源分析
沉积体系
低凸起带
detrital composition heavy mineral provenance analysis sedimentary system low uplift
