全新世东海内陆架泥质区有孔虫特征及其古环境意义

李小艳; 翦知湣; 石学法; 刘升发

doi:10.3724/SP.J.1140.2012.04061

全新世东海内陆架泥质区有孔虫特征及其古环境意义

李小艳^1,2,3,
翦知湣³,
石学法^1,2,
刘升发^1,2

1 海洋沉积与环境地质国家海洋局重点实验室, 青岛 266061;
2 国家海洋局第一海洋研究所, 青岛 266061;
3 同济大学海洋地质国家重点实验室, 上海 200092

基金项目:

海洋局一所基本科研业务费专项资金项目(GY02-2011G23)

国家海洋重点公益项目

国家自然科学基金项目(41006038)

详细信息

作者简介:
李小艳(1979-),女,助理研究员,主要从事微体古生物学、古环境方面研究。E-mail:lixiaoyan@fio.org.cn

中图分类号: P736.22
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出版历程
- 收稿日期: 2012-07-09
- 修回日期: 2012-07-19

HOLOCENE FORAMINIFERA FROM THE MUD AREA OF THE INNER SHELF,EAST CHINA SEA AND THEIR PALEOENVIRONMENTAL SIGNIFICANCE

1 Key Lab of Marine Sedimentology and Enviromental Geology, SOA, Qingdao 266061, China;
2 First Institute of Oceanography, SOA, Qingdao 266061, China;
3. Tongji University, Key Lab of Marine Geology, Shanghai 200092, China

摘要

摘要: 东海内陆架泥质区是东海全新世高海平面以来的沉积中心,保存了冰后期海平面上升以来完整的全新世沉积记录,是研究东海古海洋环境变化的良好载体,也是研究全新世古气候、古环境变迁的绝佳材料。选取了位于东海内陆架泥质区中部的MZ02孔长岩心作为研究对象,通过对沉积物中有孔虫进行属种鉴定分析,并结合岩心沉积物的岩性特征和AMS¹⁴C测年数据,主要依据底栖有孔虫组合,恢复了研究区全新世以来的沉积环境演化。研究表明,全新世以来东海内陆架泥质区的沉积环境呈现阶段性演化特征,经历了以下4个阶段的演化:阶段I (10.8~10.5 cal.kaBP)为滨岸沉积环境;阶段Ⅱ (10.5~8.3 cal.kaBP)随海面快速上升沉积环境由内陆架滨岸向中-内陆架过渡;阶段Ⅲ (8.3~5.2 cal.kaBP)为台湾暖流十分靠近的中-内陆架沉积环境;阶段IV (5.2~0 cal.kaBP)为沿岸流较强的内陆架沉积环境。暖水种丰度在8.4 cal.kaBP出现高值,推测为台湾暖流形成之时。约4.0 cal.kaBP以来表生种丰度呈现高值和底栖有孔虫¹⁸O变轻,推测与沿岸流增强密切相关。
- 古海洋环境 /
- 有孔虫 /
- 全新世 /
- 东海内陆架泥质区
Abstract: The mud area on the inner shelf of the East China Sea is one of the depocenters since the high sea-level of the Holocene. Sedimentary records since the post-glacial saved in this area provide excellent materials for studying paleoceanographic and paleoenvironmental changes during the Holocene. The Core of MZ02 was recovered from the middle of the mud area(121.89°E,28.17°N,water depth 32 m,core length 35.3 m), and radiocarbon dating, grain-size and foraminiferal analyses were performed for paleoceanographic and paleoenvironmental reconstruction. Results show that the environmental evolution in the Holocene can be divided into 4 stages:the stage I was the coastal inner shelf during 10.8~10.5 cal. kaBP; the stage Ⅱ was the period of the rapid sea-level rise from coastal shelf to the middle shelf during 10.5~8.3 cal. kaBP; the stage Ⅲ was the inner-middle shelf with the Taiwan Warm Current close to the studied area during 8.3~5.2 cal. kaBP; and the stage IV was the inner shelf under the action of the enhanced coastal current. The abundance of warm-water species increased markedly at 8.4 cal. kaBP, suggesting the invasion of the Taiwan Warm Current since then. The lower δ¹⁸O in benthic foraminifera and higher abundance of epifaunal species are thought to be closely related to the enhancement of the coastal current since~4.0 cal. kaBP.
- East China Sea /
- paleoceanography and paleoenvironment /
- foraminifera /
- Holocene

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