东北印度洋深海记录基本特征及其对青藏高原隆升的响应  

DEEP SEA SEDIMENTARY RECORDS IN THE NORTHEASTERN INDIAN OCEAN AND THEIR RESPONSE TO THE UPLIFT OF THE QINGHAI-XIZANG PLATEAU

作　　者：方念乔[1] 陈学方[1] 胡超涌[1] 丁旋[1] 张振芳[1] 刘勇勤[1] 

机构地区：[1]中国地质大学海洋地学研究中心,北京100083

出　　处：《第四纪研究》2001年第6期490-499,共10页Quaternary Sciences

基　　金：国家重点基础研究发展规划 (批准号 :G1 9980 4 0 80 0 );国家自然科学基金项目 (批准号 :4 96 72 1 35 )资助

摘　　要：本文在综合东北印度洋域 5支深海钻芯和 7支活塞柱状芯资料的基础上 ,对该区沉积作用及其形成的记录与北部山脉和高原隆升的关系进行讨论。过去有关深海记录对造山带构造活动响应的研究多集中于孟加拉浊积扇 ,而 90°E海岭的远洋沉积记录通过海气相互作用系统作为中介 ,可能包含响应隆升的重大环境信号。初步研究表明 ,远洋记录中的碳酸盐含量、有孔虫的形态结构和若干微量元素特征的剧变期与已知的高原构造阶段存在密切的对应关系 ,其中 ,距今 8Ma、3 .7Ma、0 .8Ma和 0 .1 6Ma所反映的变化尤为突出。On the basis of the data from 5 drilling cores and 7 piston cores collected in the northeast Indian Ocean, the relationship between sedimentation in the oceanic region and uplift of the mountains and plateau to the north of the region is discussed in the paper. The previous research on the response of deep-sea records to orogenesis was essentially made in the Bengal Fan. Because of the sea-air interaction as bridge, in fact, the pelagic records from the 90°E Ridge can include some significant environmental information to answer the uplift. The preliminary study indicates that the times of abrupt changes in the CaCO 3 content, the assemblage of foraminifera and its form and texture and feature of some trace elements in the pelagic records are closely corresponding to the known tectonic phases in the Qinghai-Xizang Plateau. The obvious correspondences are found to occur at the chronological points of 8Ma, 3.7Ma, 0.8Ma, and 0.16Ma.

关 键 词：印度洋 深海沉积作用 远洋沉积记录 青藏高原隆升 碳酸盐 有孔虫 

分 类 号：P542.1[天文地球—构造地质学] P736.21[天文地球—地质学]