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.
出处
《第四纪研究》
CAS
CSCD
北大核心
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
