东海内陆架泥质沉积记录的全新世快速气候波动  

Holocene abrupt climate fluctuations: Sedimentary record from the inner-shelf mud area of the East China Sea

作　　者：李小艳[1] 翦知湣[2] 石学法[1] 刘升发[1] 曹鹏[1] 乔淑卿[1] 朱志伟[1] 王旭晨[3] 

机构地区：[1]国家海洋局第一海洋研究所、海洋沉积与环境地质国家海洋局重点实验室,青岛266061 [2]同济大学海洋地质国家重点实验室,上海200092 [3]中国海洋大学化学化工学院,青岛266100

出　　处：《科学通报》2015年第4期411-419,共9页Chinese Science Bulletin

基　　金：国家自然科学基金(41006038);国家海洋局第一研究所基本科研业务费专项(GY02-2011G23);海洋公益性行业科研专项(200805063);我国近海海洋综合调查与评价专项(908-ZC-I-05);科技基础性工作专项(2008FY220300)资助

摘　　要：以东海内陆架泥质区中部MZ02孔岩芯沉积物为材料,挑选底栖有孔虫单种Ammonia compressiuscula进行了壳体氧碳稳定同位素和镁钙比值分析,并结合沉积物粒度、磁化率和地球化学等古环境替代指标,讨论了MZ02孔沉积记录所反映的若干气候和海洋环境变化,识别出发生在8.4,7.2和6.2 ka BP的3次千年事件,其中最为显著的是发生在8.4 ka BP的降温事件.本研究揭示的中全新世大暖期内气候波动特征,与相邻陆地的季风记录、热带太平洋的古海洋记录相一致,具有百年尺度的太阳活动周期,其中以200 a周期最为显著,推测太阳活动可能是研究区全新世快速气候变化的主要原因之一.Sediment core MZ02 from the inner-shelf mud area of the East China Sea was studied to address paleoclimate and marine environment change during the Holocene epoch. This core was analyzed for accelerator mass spectrometry （AMS） 14C dating, grain size, magnetic susceptibility, geochemical index （Al/Ti, Ba/Ti）, oxygen isotope, and Mg/Ca ratio of benthic for a minifera. Three significant climate change events were identified, which occurred at 8.4, 7.2 and 6.2 ka BP, respectively. The sediments are characteristic of the period, with coarse grain size and smaller Mg/Ca and δ18O values. The study revealed that the characteristics of abrupt climate fluctuation were consistent with monsoon and paleoceanographic records of the adjacent land and tropical Pacific. There are century solar cycles in the sedimentary record. The 200-year cycle is the most significant, suggesting that solar activity was the major cause of rapid climate change in the research area during the Holocene.

关 键 词：快速气候波动 全新世 东海内陆架 泥质区 古海洋学事件 

分 类 号：P532[天文地球—古生物学与地层学]