古地理学报2016，Vol.18Issue(2)：173-183,11.DOI:10.7605/gdlxb.2016.02.013
渤海湾盆地南堡凹陷南部古近系沙河街组一段古水体特征
Palaeo-water characteristics of the Member 1 of Paleogene Shahejie Formation in southern Nanpu sag,Bohai Bay Basin
摘要
Abstract
The palaeo-water characteristics of the Paleogene Shahejie Formation in Nanpu sag of Bo-hai Bay Basin was poorly studied.Taking the Member 1 of Shahejie Formation in southern Nanpu sag as an example,we studied the palaeosalinity and palaeo-water depth by many means.Based on special algae fos-sils and chemical element ratios including Sr /Ba and Rb /K,the palaeosalinity was interpreted as brackish water to semi-saline water.The palaeoclimate was humid with fluctuation by analyzing Sr /Cu ratio and sporopollen fossils.The relative palaeo-water depth was reconstructed according to the change of Mn /Fe ra-tio,kerogen types,algae fossils and Tulotomoides.By synthetic analysis with the authigenic clay miner-als,sedimentary structure and sedimentary facies, the palaeo-water depth interval was calculated by weighted average method.The results show that it was shallow water sedimentary environment with the quantitative palaeo-water depth ranging from 4m to 15m during the depositional period of the top of mid-dle submember of Member 1 of Shahejie Formation in Nanpu sag.During the depositional period of lower submember of Member 1 of Shahejie Formation,the palaeo-water depth changed from 4 m to 30 m.It is in-dicated that the palaeosalinity and palaeo-water depth depended relatively on the palaeoclimate and ancient terrain background.关键词
古盐度/古气候/古水深/古近系/渤海湾盆地Key words
palaeosalinity/palaeoclimate/palaeo-water depth/Paleogene/Bohai Bay Basin分类
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杜庆祥,郭少斌,沈晓丽,曹中宏,张晓龙,李媛姝..渤海湾盆地南堡凹陷南部古近系沙河街组一段古水体特征[J].古地理学报,2016,18(2):173-183,11.基金项目
国家油气重大专项（编号2011ZX05006－006）、国家自然科学基金项目（批准号41502064）和山东科技大学人才引进科研启动基金课题（编号2014RCJJ012）联合资助。［Co-funded by the National Major Program of Oil and Gas （Grant No．2011ZX05006－006），the National Natural Science Foundation of China （Grant No．41502064）and the Scientific Research Foundation of Shandong University of Science and Technology （Grant No．2014RCJJ012）］ （）
