全新世以来长江口底栖有孔虫组合及古环境演化

蔡庆芳; 王飞飞; 印萍; 刘冬雁; 范代读

doi:10.16562/j.cnki.0256-1492.2016.06.020

全新世以来长江口底栖有孔虫组合及古环境演化

1. 国土资源部海底矿产资源重点实验室, 中国地质调查局广州海洋地质调查局, 广州 510075;
2. 中国地质调查局青岛海洋地质研究所, 青岛 266071;
3. 中国海洋大学海洋地球科学学院, 青岛 266100;
4. 同济大学海洋地质国家重点实验室, 上海 200092

基金项目:

长江口重点海岸带综合地质调查

详细信息

作者简介:
蔡庆芳(1987-)女,工程师,从事微体古生物研究工作,E-mail:cqfrenzhe@126.com

中图分类号: P736.22
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出版历程
- 收稿日期: 2016-06-19
- 修回日期: 2016-10-27

SUBASSEMBLAGES OF BENTHIC FORAMINIFERA AND PALAEOENVIRONMENTAL IMPLICATION IN THE YANGTZE RIVER ESTUARY SINCE HOLOCENE

1. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510075, Guangdong, China;
2. Qingdao Institute of Marine Geology, Qingdao 266071, China;
3. College of Marine Geosciences, Ocean University of China, Qingdao 266100, Shandong, China;
4. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

摘要

摘要: 对长江口YD0903孔的底栖有孔虫组合进行了定量统计分析,结合沉积地层学、AMS¹⁴C测年、沉积物粒度等,重建了全新世以来研究区的沉积环境演化。主要划分为6个环境演化阶段:11 260~10 150 cal. aBP,以Ammonia beccarii vars. 组合为标志的滨岸环境;10 150~7 730 cal. aBP,以Epistominella naraensis-Ammonia beccarii vars.奈良小上口虫-毕克卷转虫变种组合为标志的滨岸-浅海过渡环境;7 730~3 610 cal. aBP,以Epistominella naraensis奈良小上口虫组合为标志的溶解氧偏低的浅海环境;3 610~2 930 cal. aBP,以Quinqueloculina spp. 组合为标志的温度、盐度相对较高的浅海环境;2 930~2 150 cal. aBP,以Bolivina spp.组合为标志的低氧富营养的前三角洲-浅海环境;2 150~220 cal. aBP,以Protelphidium tuberculatum组合为标志的低温的前三角洲-浅海环境。
- 有孔虫 /
- 全新世 /
- 古环境 /
- 长江口
Abstract: According to quantitative statistics interpretation on the foraminiferal assemblages, combined with AMS ¹⁴C dating, grain size and geochemistry data of the YD-0903 borehole collected from the offshore of the Yangtze River estuary, this paper discusses the evolution of Holocene palaeoenvironment of the estuary. 6 stages of sedimentary environmental evolution of the studied area are defined, i.e. 11 260~10 150 cal.aBP, dominated by Ammonia beccarii vars, indicating an estuarine and nearshore environment; 10 150~7 730 cal.aBP, dominated by Epistominella naraensis-Ammonia beccarii vars, indicating an estuarine, nearshore to shallow shelf environment; 7 730~3 610 cal.aBP, dominated by Epistominella naraensis-Florilus spp., indicating a hypoxia shallow shelf environment; 3 610~2 930 cal.aBP, characterized by Quinqueloculina spp., indicating a relatively high temperature and high salinity shallow shelf environment; 2 930~2 150 cal.aBP, characterized by Bolivina spp., indicating a hypoxic and nutrient-rich prodelta to a shallow shelf environment; and 2 150~220 cal.aBP, dominated by Protelphidium tuberculatum, indicating a low temperature prodelta environment.
- foraminifera /
- Holocene /
- Palaeoenvironment /
- Yangtze River Estuary

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