权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study of World Ocean Floor by Drilling & Down hole Measurement

通过钻探研究世界海底

基本信息

批准号：
04044045
负责人：
TAIRA Asahiko
金额：
$ 15.36万
依托单位：
Ocean Research Institute, Univ. of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04044045/
关键词：
mantle plume oceanic crust plate tectonics sea level change ice age greenhouse earth ocean drilling tomography スーパープリューム地球環境変動気候温暖化海進海底地殻海洋磁気異常潜水船

项目摘要

The research conducted this year includes the tectonics, sedimentation, petrology and paleoenvironments of the Atlantic Ocean. The mechanism of the breakup the Pangea and the birth of the Atlantic Ocean has been the one of the major objectives of the earth sciences. This program investigated the Greenland offshore penetrated an entire section of so-called seaward dipping reflector and found that the breakup was accompanied by dome uplift, emplacement of enormous basaltic magma which followed by rapid subsidence. This sequence of event suggests that the continental breakup and greenhouse earth was associated with mantle plume. This finding is a major break through in the earth science.The program also made a major contribution in the field of paleooceanography. The deep seas drilling in the area of northern Atlantic showed that the initial development of the polar ice sheet started about 7.5 Ma and massive development about 2.5 Ma. The high frequency cold-warm signals with duration of several thousand years were detected as a change in sea surface temperature concordant with the results of the Greenland ice core data. This produced a truly new insight into the climatic behavior and previous view of ice age climatic picture have to be reconsidered with new perspectives.Samples and data brought from the drilling vessel have been analyzed in cooperation with partner countries' scientist. Continuos discussion has been carried in the various committees and panels for the evaluation of results, science planning and future direction. An important meeting was held in Kyoto for the future planning of ocean drilling. An consensus was reached ; need for deep drilling and strong program of borehole observatory for earth interior tomography. The future direction of ocean drilling should emphasize these two points.

今年进行的研究包括大西洋的构造、沉积、岩石学和古环境。盘古大陆解体和大西洋诞生的机制一直是地球科学的主要目标之一。该计划调查了格陵兰近海贯穿整个所谓的向海倾斜反射层的整个剖面，发现解体伴随着穹隆隆起，大量玄武岩岩浆侵位，随后迅速下沉。这一系列事件表明，大陆裂解和温室地球与地幔热柱有关。这一发现是地球科学的重大突破。该计划也在古海洋学领域做出了重大贡献。北大西洋海域的深海钻探表明，极地冰盖的初始发育约为7.5 Ma，大规模发育约为2.5 Ma。探测到的持续数千年的高频冷暖信号是海表面温度的变化，与格陵兰冰芯数据的结果一致。这对气候行为产生了真正的新认识，以前对冰河时代气候图景的看法必须以新的视角重新考虑。钻井船带来的样本和数据已与伙伴国的科学家合作进行了分析。各委员会和小组就成果评价、科学规划和未来方向进行了持续的讨论。在京都举行了一次重要会议，以规划未来的大洋钻探。达成共识：需要深部钻探和强大的地球内部层析成像钻孔观测站方案。未来大洋钻探的方向应该强调这两点。