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Geoscientific research on the geological cross section down to upper mantle in the arc-trench system with backarc basin

弧后盆地弧沟体系下至上地幔的地质剖面地球科学研究

基本信息

批准号：
14340147
负责人：
ISHII Teruaki
金额：
$ 10.3万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

This research program is based on the geological and geophysical expedition for ocean floor basic geosciences using huge scientific Research Vessels(R/V).First year : Experimental equipments in laboratory and observational systems for cruise were prepared. On 27-28 February 2003, we held symposium on "Geology, petrology, geophysics and geotectonic on Philippine sea" as corporative symposium, Ocean Research Institute(ORI), University of Tokyo(UT). Presented papers were published in book(196 pages).Second year : Geological and geophysical survey were operated on ocean floor geosciences to investigate trench-arc-backarc system in southern and eastern Philippine sea using R/V Hakuho-maru(3987ton), ORI, UT, during 18days, November 2003. Geological and petrological analyzes on dredged rocks including mantle peridotite, gabbro, basalt, and etc, from southern Mariana trench inner-wall suggest that petrological MOHO-discontinuity and thrust were locating along the wall. Ocean Bottom Seismometer … More (OBS) observation indicate that main edifice of Haha-jima seamount, Ogasawara forearc is composed by serpentinized peridotites.Third year : Geological and geophysical survey was also performed on Haha-jima seamount using R/V Tansei-maru(610ton), ORI, UT, during 13 days, November 2004. Petrological analyzes on dredged rocks showed that ophiolite sequences were confirmed at summit area. Geological samples and geophysical data obtained from above mentioned two main research area were analyzed, compiled and organized.Systematic sampling on constituting igneous rocks to establish geological cross section in both huge steep escarpment and Haha-jima seamount have been done and those samples were precisely analyzed by geological and petrological methods. Geophysical observations were also performed in these area. These geological and geophysical data were combined together so effectively that more accurate geological cross section than previous one including upper mantle can be proposed, then tectonics and petrological evolution in Philippine Sea can be solved. We had additional seminar on "Comparative studies on mantle structure and magma genesis between Philippine sea bedrocks and northeastern Japanese arc" on 7-8 March 2005, (Book coming soon). Less

这项研究计划是基于使用大型科学考察船(R/V)进行的海底基础地球科学的地质和地球物理考察。第一年：准备了实验室实验设备和巡航观测系统。2003年2月27-28日，我们在东京大学海洋研究所(ORI)联合举办了“菲律宾海地质学、岩石学、地球物理学与大地构造”研讨会。第二年：2003年11月，利用俄勒冈州ORI的R/V Hakuho-Maru(3987吨)，对海底地球科学进行了地质和地球物理调查，以调查菲律宾南部和东部的海沟-弧后系统。对南马里亚纳海沟内壁的地幔橄榄岩、辉长岩、玄武岩等疏浚岩石的地质和岩石学分析表明，沿壁存在岩石的莫霍面和逆冲。…海底地震仪更多的(OBS)观测表明，小川前哈哈-吉马海山的主要建筑是由蛇纹化的橄榄岩组成的。第三年：2004年11月13天期间，利用美国俄勒冈州ORI的R/V Tansei-Maru(610吨)对哈哈-吉马海山进行了地质和地球物理调查。对疏浚岩石的岩石学分析表明，顶区确认了蛇绿岩序列。对上述两个主要研究区的地质样品和地球物理资料进行了分析、整理和整理，对火成岩的组成进行了系统采样，建立了巨陡崖和哈哈-吉马海山的地质剖面，并对样品进行了地质和岩石学的精确分析。在这些地区还进行了地球物理观测。将这些地质和地球物理资料有效地结合在一起，可以提出比以前包括上地幔在内的地质剖面更精确的地质剖面，从而可以解决菲律宾海的构造和岩石演化问题。2005年3月7-8日，我们还举办了“菲律宾海基岩与日本东北弧地幔结构与岩浆成因的比较研究”研讨会(即将出版)。较少