| 全新世东海内陆架泥质区有孔虫特征及其古环境意义 |
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| 引用本文： | 李小艳,翦知湣,石学法,刘升发.全新世东海内陆架泥质区有孔虫特征及其古环境意义[J].海洋地质与第四纪地质,2012(4):61-71. |
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| 作者姓名： | 李小艳 翦知湣 石学法 刘升发 |
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| 作者单位： | 海洋沉积与环境地质国家海洋局重点实验室;国家海洋局第一海洋研究所;同济大学海洋地质国家重点实验室 |
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| 基金项目： | 国家自然科学基金项目(41006038);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(200805063) |
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| 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AMS14 C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(10.8～10.5cal.kaBP)为滨岸沉积环境;阶段II(10.5～8.3cal.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(8.3～5.2cal.kaBP)为台湾暖流十分靠近的中—内陆架沉积环境;阶段IV(5.2～0cal.kaBP)为沿岸流较强的内陆架沉积环境。暖水种丰度在8.4cal.kaBP出现高值,推测为台湾暖流形成之时。约4.0cal.kaBP以来表生种丰度呈现高值和底栖有孔虫18 O变轻,推测与沿岸流增强密切相关。
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| 关 键 词： | 古海洋环境 有孔虫 全新世 东海内陆架泥质区 |
HOLOCENE FORAMINIFERA FROM THE MUD AREA OF THE INNER SHELF,EAST CHINA SEA AND THEIR PALEOENVIRONMENTAL SIGNIFICANCE |
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| LI Xiaoyan,JIAN Zhimin,SHI Xuefa,LIU Shengfa.HOLOCENE FORAMINIFERA FROM THE MUD AREA OF THE INNER SHELF,EAST CHINA SEA AND THEIR PALEOENVIRONMENTAL SIGNIFICANCE[J].Marine Geology & Quaternary Geology,2012(4):61-71. |
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| Authors: | LI Xiaoyan JIAN Zhimin SHI Xuefa LIU Shengfa |
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| Institution: | 1,2(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) |
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| 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. |
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| Keywords: | East China Sea paleoceanography and paleoenvironment foraminifera Holocene the mud area on the inner shelf |
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