From Chile Ridge Subduction To Magma Supply System (CHRISTMASSY) project

从智利山脊俯冲到岩浆供应系统（CHRISTMASSY）项目

基本信息

批准号：
13373004
负责人：
ANMA Ryo
金额：
$ 19.55万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

项目摘要

This research project aims to understand 1)the emplacement mechanism of the Taitao ophiolite located nearby the Chile triple junction to clarify its origin and petrochemical characteristics of source material that caused the arc magmatism, 2)the spatial-temporal evolution of magmatisms that supposedly related to the subduction of the young and hot Chile ridge, and 3)the deep structures underneath the ridge subduction zone through seismic study. The main contributions of this research project are as follows. 1)We collected 5 tons of samples of post-Miocene igneous rocks systematically from Patagonia and established the best library for the rock samples. 2)Emplacement mechanism of the Taitao ophiolite was understood by paleomagnetic means. The plutonic section of the ohiolite must be originated nearby the mid-axis of the Chile reidge, and them obducted to the South American fore-arc. 3)The rocks of the Taitao ophiolite were confirmed to have both N-MORB and E-MORB compositions, and too a … More ccompany simultaneous granite intrusions with arc signatures. The patterns of ocean floor metamorphism along the mid-oceanic ridge section was preliminary estimated. 4)First geological maps were made for Hudson and Lautaro volcanoes, located both end Of the Patagonian volcanic gap. Systematic K-Ar dating was performed too clarify the duration of the volcanic activities. 5)Radiometric ages and petrochemical characteristics were established for adakites from the Austral Volcanic zone, together with those from Cerro Pampa and Puesto Nuevo. New genetic model for adakite were suggested. 6)radiometric ages and petrochemical investigation were done on the rocks of Somuncura, an extra-baxkarc volcanic field. Genetic models for the extra backarc volcanism were suggested. 7)Miocene granites were recognized to distributed in two (or probably three) lines that parallel the Chile trench axis. We preliminary carried petrochemical and geochronological studies. 8)With close collaboration with Dr.Priestley of the Bullard Institute, Cambridge University, we set a seismometer network near the Lat 46S.to understand the deep structures across the Chile ridge subduction zone. 9)Deep structures sere numerically predicted for a ridge subduction zone. Less

该研究项目的目的是了解1）位于智利三重连接附近的塔托蛇蛇绿岩的授权机制，以澄清其来源和元素材料的起源和石化特征，这些材料引起了弧形岩浆主义，2）据称与玛格玛氏症的空间 - 周期性进化，据说与Young Cridge Ridge Ridge unduction and Hot chile ridge和3）的结构相关，以及3）。地震研究。该研究项目的主要贡献如下。 1）我们从巴塔哥尼亚系统地收集了5吨中新世的火成岩样本，并建立了最佳的岩石样品图书馆。 2）塔托蛇绿岩的埋入机制是通过古磁方法理解的。 Ohiolite的Plutonic段必须起源于智利雷奇的中轴附近，并向南美的前王产生。 3）确认Taitao Ophiolite的岩石同时具有N-MORB和E-MORB组成，并且也有……更多的公司同时带有ARC特征的花岗岩侵入。初步估计了海底变质的模式。 4）为哈德逊和劳塔罗火山的第一个地质图制作，这两个火山都位于巴塔哥尼亚火山缝隙的两端。进行系统的K-AR约会也太阐明了火山活动的持续时间。 5）建立了来自澳大利亚火山区的Adakites的辐射年龄和石化特性，以及Cerro Pampa和Puesto Nuevo的辐射化学特性。提出了新的Adakite遗传模型。 6）辐射年龄和石化投资是在Somuncura的岩石上进行的，Somuncura是一个额外的火山场。提出了额外的后卫火山的遗传模型。 7）中新世花岗岩被认为分布在平行于智利沟槽轴的两条（或三个）线中。我们初步携带石化和地质学研究。 8）在与剑桥大学Bullard Institute的Priestley博士密切合作的情况下，我们在LAT 46附近建立了一个地震仪网络，以了解整个智利山脊俯冲带的深层结构。 9）深层结构在数值上预测了脊俯冲带。