冲绳海槽末次冰期以来黑潮流游移在沉积硅藻中的记录  

SEDIMENTARY DIATOM RECORDS ON EXCURSION OF KUROSHIO CURRENT IN OKINAWA TROUGH SINCE LAST GLACIATION

作　　者：蓝东兆[1] 陈承惠[1] 李超[2] 

机构地区：[1]国家海洋局第三海洋研究所,福建厦门361005 [2]厦门大学海洋系/亚热带海洋研究所,福建厦门361005

出　　处：《古生物学报》2003年第3期466-472,共7页Acta Palaeontologica Sinica

基　　金：国家自然科学基金 (No .499760 19)资助课题

摘　　要：文中描述冲绳海槽中段 2个柱样沉积物中优势硅藻种相对含量 ,热带远洋种相对含量和硅藻组合的分布特征 ;讨论地层的划分和对比、冲绳海槽末次冰期鼎盛期的古黑潮流、全新世黑潮流游移等科学问题。结果表明 ,冲绳海槽末次冰期鼎盛期的古黑潮流在现今 10 0 0m等深线之间流过 ,当时的黑潮流宽度应小于 5 0km ;16ka—11kaB .P .随着海面上升 ,黑潮流越过西侧 10 0 0m等深线 ,向东海陆架偏移 ;全新世黑潮流分别在大约 7ka—8kaB .P .1ka— 4kaB .P .出现过两次黑潮流宽度变窄。In the paper,the distributive characteristics are described on the relative content of dominant diatom species, the relative content of tropical pelagic species and the diatom assemblages in two sedimentary cores in the central section of Okinawa Trough; and then some scientific problems are discussed on the stratigraphic subdivision and correlation, the ancient Kuroshio Current in Last Glaciation maximum and the excursion of Kuroshio Current during Holocene Epoch in Okinawa Trough. The results show that the ancient Kuroshio Current runs through Okinawa Trough between the present 1 000m isobaths with a width of the Current of less than 50km at the maximum of Last Glaciation. Following the sea level rising during 16 ka—11ka B.P., the Kuroshio Current passes through the 1 000m isobaths of the west side and excurses toward the continental shelf of the East China Sea. The Kuroshio Current in Holocene shows two excursions of narrower width and weaker strength in about 7 ka—8 ka B.P. and 1ka—4 ka B.P..

关 键 词：冲绳海槽 末次冰期 黑潮流游移 沉积硅藻 

分 类 号：Q914.82[天文地球—古生物学与地层学] Q914.6[生物学—古生物学]