Petrologic study on the Paleozoic ophiolites and high-P metamorphic rocks in Japan (especially in the Joetsu belt)

日本（特别是上越带）古生代蛇绿岩和高磷变质岩岩石学研究

基本信息

批准号：
14540447
负责人：
ISHIWATARI Akira
金额：
$ 1.79万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
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

Ishiwatari & Tsujimori (2003) synthesized the time-space distribution of ophiolites and high-P metamorphic rocks in Japan and Russian Primorye, and concluded geological continuity between the two areas before the Miocene opening of the Sea of Japan. They further postulated a hypothesis that the Japanese Late Paleozoic ophiolites and high-P metamorphic belts extend to the west to the Chinese Sulu-Dabie collision zone via Yaeyama (western Ryukyu Islands), detouring Korea. Ishiwatari, Sokolov & Vysotskiy (2003) found that ophiolites in Japan and Russian Far East are characterized by common occurrence of highly depleted harzburgite and opx-type cumulate, and postulated that the Mariana-type ophiolite (and blueschist) formation and the Nankai-type accretion of sediments repeated one after another through the Phanerozoic time, resulting in the multiple ophiolite belts. Ichiyama & Ishiwatari (2004) studied the Yakuno ophiolite in the Yakuno Town area, and concluded that this ophiolite formed … More in a back-arc environment, not in an oceanic plateau as postulated by some geologists. Ishiwatari & Ichiyama (2004) compiled geologic and petrologic data about ultramafic lavas and the Alaskan-type intrusive rocks occurring in the accretionary complexes in Japan, Russian Primorye and Sakhalin, and northeastern China, and concluded that these peculiar rocks may have formed by a superplume magmatism of 2,000 km diameter which hit subductien zones in the East Asian margin in the Jurassic time, though some of them represent Permian superplume activity in an oceanic environment. Ichiyama & Ishiwatari (2005) reported a HFSE-rich picrite (meimechite) sills and hyaloclastites intercalated in the Late Permian chert sequence overlying a huge limestone-greenstone body of Mt. Funafuse-yama in the Mine belt, a Jurassic accretionary complex. They find that the magma resembles ultramafic magmas in the Permian Siberian LIP, and postulated a superplume-related, HIMU-source origin. Shimizu & Ishiwatari (in preparation) studied Late Paleozoic high-pressure metamorphic rocks (glaucophane schist and pelitic schist) of the Joetsu belt, and concluded that the belt consisted of a combination of high-P and medium-P metamorphic belts. Less

Ishiwatari＆Tsujimori（2003）综合了日本和俄罗斯Primorye的Ophilites和高P变质岩石的时空分布，并在日本海洋中新世开放之前的两个区域之间结束了地质连续性。他们进一步发布了一个假设，即日本已故的古生代蛇晶和高-P变质带延伸到西部，延伸到中国的Sulu-Dabie碰撞区，通过Yaeyama（Western）Ryukyu群岛），绕着朝鲜绕行。 Ishiwatari, Sokolov & Vysotskiy (2003) found that ophiolites in Japan and Russian Far East are characterized by common occurrence of highly depleted harzburgite and opx-type cumulate, and postulated that the Mariana-type ophiolite (and blueschist) formation and the Nankai-type accretion of sediments repeated one after another through the植物学时间，导致多个蛇绿岩带。 Ichiyama＆Ishiwatari（2004）在Yakuno Town地区研究了Yakuno Ophiolite，并得出结论认为，这种Ophiolite是在后弧环境中形成的，而不是一些地理学家发布的海洋高原。 Ishiwatari＆Ichiyama（2004）编制了有关超镁铁质熔岩和阿拉斯加型侵入性岩石的地质和质学数据侏罗纪时间的东亚边缘区域，尽管其中一些代表了海洋环境中的二叠纪超跨活动活动。 Ichiyama＆Ishiwatari（2005）报道了富含hfse的皮肤（Meimecchite）窗台和透明质层在已故的二叠纪裂缝序列中插入，上面覆盖了一个巨大的石灰石 - 石灰石 - 伊拉多斯石体的巨大的石灰岩 - 富富山（Funafuse-Yama），该物体是侏罗纪属于侏罗纪群中的伊斯兰山，是一个侏罗纪的属于大侏罗纪的复合体综合体。他们发现岩浆在二叠纪西伯利亚嘴唇中类似于超镁质岩浆，并发布了与超级胶合相关的Himu-Source起源。 JOETSU带的Shimizu＆Ishiwatari（准备）研究了晚期古生代高压变质岩石（Glaucophane Schist和Pelitic Schist），并得出结论，该皮带由高P和中型P变质带组成。较少的