碎屑岩的物质成分、物质来源与大地构造关系──以宣龙内陆海长城期常州沟─串岭沟组碎屑岩为例  

The Relation of Clastic Materials and Provenance to Tectonics──Aanalyses of Changchengian Changzhougou-Chuanlinggou Formations in Xuanlong In-land Sea

作　　者：聂逢君[1] 

机构地区：[1]华东地质学院地球科学系

出　　处：《华东地质学院学报》1996年第4期363-369,共7页Journal of East China Geological Institute

摘　　要：应用ＷＲＤｉｃｋｉｎｓｏｎ等人对砂岩与物源分析结果，对我国华北地台第一沉积盖层的宣龙内陆海长城系的常州沟组和串岭组的砂岩和石英岩状砂岩进行投点，结果表明，形成砂岩和石英岩状砂岩的主要物源，是内陆海南北两侧的大陆块蚀源区的克拉通源区。通过阴极发光分析，进一步揭示了克拉通古陆火成岩的物源略多于变质岩。重矿物鉴定结果，确定了火成岩主要为花岗岩和花岗闪长岩；变质岩为合石榴石斜长片麻岩和角闪片麻岩等。克拉通岩石经过长期风化，碎屑经过远距离搬运和充分地离解和分解之后，在宣龙内陆海沉积了常州沟、串岭沟组的砂岩和石英岩状砂岩。The application of the analytical results of sandstone and provenance achieved by W. R. Dickinson et al to the first sedimentary cover rocks of Huabei platform the sandstone and quartzinc sandstone of changzhougou and Chuanlinggou formations in Xuanlong in land Sea shows that the main elastic source for the sandstone and quartzitic sandstone came from the Northern and Southern oldlands of Xuanlong In-land Sea. In terms of the cathodoluminescent analysis from the sandstone samples, the source rocks are igneous and metamorphic which provided almost the same materials in quantity. Moreover, based on the idenfification of heavy minerals from sandstones, we can obtain that the igneous source is granite and granodiorite; the metamorphic is garnet plagiogneiss and horblende gneiss ect. Consequently, the rock, on the cratonic oldlands had undergone strong werthering for a long time. The clasts were transported for a long distance over the gentle surface of oldlands. After the sufficient disintegration and decomposition, they reached Xuanlong In land Sea and formed the sandstone and quartzitic sandstone we have observed.

关 键 词：碎屑岩 砂岩 物质成分 物质来源 

分 类 号：P588.21[天文地球—岩石学]