Vast laminated diatom mat deposits from the west low-latitude Pacific Ocean in the last glacial period  

作　　者：ZHAI Bin LI TieGang CHANG FengMing CAO QiYuan 

机构地区：[1]Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Science Bulletin》2009年第23期4529-4533,共5页

基　　金：Supported by the National Basic Research Program (Grant No. 2007CB815903);National Natural Science Foundation of China (Grant No. 40776031);Pilot Project of the National Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-YW-221)

摘　　要：Diatoms are one of the predominant contributors to global carbon fixation by accounting for over 40% of total oceanic primary production and dominate export production. They play a significant role in marine biogeochemistry cycle. The diatom mat deposits are results of vast diatoms bloom. By analysis of diatom mats in 136°00′―140°00′E,15°00′―21°00′N, Eastern Philippines Sea, we identified the species of the diatoms as giant Ethmodiscus rex (Wallich) Hendey. AMS 14C dating shows that the sediments rich in diatom mats occurred during 16000―28600 a B.P., which means the bloom mainly occurred during the last glacial period, while there are no diatom mat deposits in other layers. Preliminary analysis indicates that Antarctic Intermediate Water (AAIW) expanded northward and brought silicate-rich water into the area, namely, silicon leakage processes caused the bloom of diatoms. In addition, the increase of iron input is one of the main reasons for the diatom bloom.Diatoms are one of the predominant contributors to global carbon fixation by accounting for over 40% of total oceanic primary production and dominate export production. They play a significant role in marine biogeochemistry cycle. The diatom mat deposits are results of vast diatoms bloom. By analysis of diatom mats in 136°00′--140°00′E, 15°00′--21°00′N, Eastern Philippines Sea, we identified the species of the diatoms as giant Ethmodiscus rex （Wallich） Hendey. AMS 14C dating shows that the sediments rich in diatom mats occurred during 16000--28600 a B.P., which means the bloom mainly occurred during the last glacial period, while there are no diatom mat deposits in other layers. Preliminary analysis indicates that Antarctic Intermediate Water （AAIW） expanded northward and brought silicate-rich water into the area, namely, silicon leakage processes caused the bloom of diatoms. In addition, the increase of iron input is one of the main reasons for the diatom bloom.

关 键 词：末次冰期 硅藻 藻垫 存款 太平洋 低纬度 生物地球化学循环 层压 

分 类 号：P532[天文地球—古生物学与地层学] Q949.271[天文地球—地质学]