古地理学报2011，Vol.13Issue(2)：161-174,14.
江苏高邮凹陷古近系戴南组一段物源体系和沉积相
Provenance system and sedimentary facies of the Member 1 of Paleogene Dainan Formation in Gaoyou Sag, Jiangsu Province
摘要
Abstract
Clastic component and heavy mineral analyses show that sediments of Huazhuang, northern Fumin and Yong'an areas in the northern slope were all from Zheduo low convex, while those of Lianmengzhuang and Majiazui areas came from the Lingtangqiao low convex, those of the southern steep slope were from Tongyang Uplift, and those of Zhouzhuang area came from eastern provenance during the depositional period of the Member 1 of Paleogene Dainan Formation in the Gaoyou Sag. Mother rocks of the Member 1 of Dainan Formation are mainly medium-low grade metamorphic rocks, while neutral and acid igneous rocks are distributed widely than basic igneous rocks, with little or none plutonite. Cores observation, data of logs and well logging, combined with characteristics of provenance systems in the study area indicate that mainly fan delta, delta, neritic subaqueous fan and lacustrine facies are developed. The northern slope of the sag has a low gradient and sediments from the Zheduo and Lingtangqiao low convexes are deposited on the gentle slope along the subaqueous channels by spotted source type, which formed deltaic facies, and the difference of sediment supply controlled the scale of delta. In the southern steep slope of the sag, with a steep gradient, due to the development of many subaqueous channels near the bank, the sediments derive from multiple sources and different types of mother rocks are deposited in lake after erosion, leading to the formation of subaqueous fan near banks and fan delta deposition on different tectonic positions. In the southwest area of the sag, sediments of the former delta front collapsed and formed collapsing turbidite fan in deeper water in the form of linear type for the altitude difference between delta front and prodelta, resulted from the existence of the Hanliu Fault. In the middle part of the sag or flanks and distal end of sandstone and sand conglomerate deposits, due to the slight effect of tectonic movement and inadequate supply of source rocks, lacustrine facies are developed.关键词
物源体系/沉积相/戴南组/断陷湖盆/高邮凹陷Key words
provenance system/ sedimentary facies/Dainan Formation/ rift lacustrine basin/Gaoyou Sag分类
天文与地球科学引用本文复制引用
周健,林春明,张霞,姚玉来,潘峰,俞昊,陈顺勇,张猛..江苏高邮凹陷古近系戴南组一段物源体系和沉积相[J].古地理学报,2011,13(2):161-174,14.基金项目
"内生金属矿床成矿机制研究国家重点实验室"自主研究基金项目(编号:2009-Ⅱ-11)和教育部高等学校博士学科点专项科研基金项目(编号:20090091110023)共同资助 （编号:2009-Ⅱ-11）
