Seafloor Geology of the Basement Serpentinite Body in the Ohmachi Seamount (Izu-Bonin Arc) as Exhumed Parts of a Subduction Zone Within the Philippine Sea
Seafloor Geology of the Basement Serpentinite Body in the Ohmachi Seamount (Izu-Bonin Arc) as Exhumed Parts of a Subduction Zone Within the Philippine Sea
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作为菲律宾海俯冲带发掘部分的大町海山（伊豆-小笠原岛弧）基底蛇纹岩体的海底地质
DOI：
10.1007/978-90-481-8885-7_5
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Ueda;H.;Niida;K.;Usuki;T.;Hirauchi;K.;Meschede;M.;Miura;R.;Ogawa;Y.;Yuasa;M.;Sakamoto;I.;Chiba;T.;Izumino;T.;Kuramoto;Y.;Azuma;T.;Takeshita;T.;Imayama;T.;Miyajima;Y.;Saito;T.
伊豆-小笠原锋锋弧的大町海山是深俯冲带岩石暴露在现代海底的非常罕见的地点之一。潜水和挖泥结果显示，基底蛇纹岩体伴生少量角闪石片岩（收集到6块直径小于20 cm的浮石），并残留有蓝片岩至榴辉岩相矿物，并被始新世至中新世火山和沉积序列覆盖。与马里亚纳弧前著名的蛇纹石泥火山的出现相反，大町海山蛇纹岩体是一个连贯体，主要由上层的块状蛇纹岩和下层的片状蛇纹岩和角闪片岩组成。两种类型的蛇纹岩均主要由叶蛇纹岩 ±橄榄石组成，并经历绿片岩至角闪岩级变质作用。地质结构被古近纪基底截断，蛇纹岩体被解释为代表一组上盘楔形地幔（块状蛇纹岩）和俯冲通道（片状蛇纹岩）的基底杂岩，它捕获了下盘俯冲板片的碎片。该复合体可能是与菲律宾海板块的弧后扩张一起被挖掘出来的。
The Ohmachi Seamount in the Izu-Bonin frontal arc is one of the very rare localities where rocks from a deep subduction zone are exposed on the modern sea floor. Submersible and dredge results revealed that the basement serpentinite body is accompanied by small amounts of amphibole schist (six float stones less than 20 cm in diameter were collected) with relics of the blueschist to eclogite facies minerals, and is covered by volcanic and sedimentary sequences of Eocene to Miocene ages. In contrast to the occurrences of well-known serpentine mud volcanoes in the Mariana forearc, the Ohmachi Seamount serpentinite body is a coherent mass composed dominantly of massive serpentinite in upper horizons and of schistose serpentinite with amphibole schist in lower horizons. Both types of serpentinites consist mainly of antigorite ± olivine, and suffered greenschist to amphibolite grade metamorphism. Geologic structures are truncated by the base of the Paleogene, and the serpentinite body is interpreted as a basement complex representing a set of the hanging-wall wedge mantle (massive serpentinite) and the subduction channel (schistose serpentinite), which trapped pieces from the foot-wall subducted slab. The complex was exhumed probably along with one of the back-arc spreading in the Philippine Sea plate.
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DOI：
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