Early tholeiitic and calc-alkaline arc magmatism of middle to Late Eocene Age in the southern Ogasawara (Bonin) forearc

Satoru Haraguchi; Teruaki Ishii; Jun-Ichi Kimura

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Early tholeiitic and calc-alkaline arc magmatism of middle to Late Eocene Age in the southern Ogasawara (Bonin) forearc

机译：小gas原（Bonin）前臂中新世中期至晚期的早孕和钙碱性弧岩浆作用

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Analysis of middle and upper Eocene rocks from the IBM forearc, including the Ogasawara and Mariana Islands, help illuminate early arc volcanism of the proto-IBM arc. Dredged volcanic rocks from the forearc are two-pyroxene basalt to andesite, and may be divided into two groups, tholeiite and calc-alkaline, on the basis of mineralogy, petrography, and bulk chemistry. Tholeiites are characterized by high HFSE contents, high crystallization temperatures, and low water contents. In contrast, the calc-alkaline rocks are characterized by low HFSE contents, low crystallization temperatures, and higher water contents. These characteristics indicate that magma genesis for the two series differed. The tholeiites resulted from high degrees of partial melting of slightly depleted mantle under anhydrous conditions, whereas the calc-alkaline rocks were generated by low degrees of melting of depleted mantle under hydrous conditions. We believe that differences in mantle depletion arose from compositional layering and fluid zonations caused by MORB volcanism and slab dehydration, respectively.

机译：对来自IBM前臂的中新世和上新世岩石的分析，包括小gas原和马里亚纳群岛，有助于阐明原IBM弧的早期弧火山作用。从前臂挖出的火山岩是到安山岩的两种辉石玄武岩，根据矿物学，岩相学和本体化学，可以将其分为钙铁矿和钙长石两类。菱铁矿的特征在于高HFSE含量，高结晶温度和低水含量。相反，钙碱性岩石的特征是HFSE含量低，结晶温度低和水含量高。这些特征表明，这两个系列的岩浆成因不同。绿泥石是由于在无水条件下略微耗尽的地幔的高度部分熔融而引起的，而钙碱性岩石是由在含水条件下低度的幔子的较低熔融程度而产生的。我们认为，地幔耗竭的差异分别是由MORB火山作用和板坯脱水引起的成分分层和流体分区引起的。

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《Contributions to Mineralogy and Petrology》 |2008年第5期|共26页
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Satoru Haraguchi; Teruaki Ishii; Jun-Ichi Kimura;
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1. Early tholeiitic and calc-alkaline arc magmatism of middle to Late Eocene Age in the southern Ogasawara (Bonin) forearc [J] . Satoru Haraguchi, Teruaki Ishii, Jun-Ichi Kimura Contributions to Mineralogy and Petrology . 2008,第5期

机译：小gas原（Bonin）前臂中新世中期至晚期的早孕和钙碱性弧岩浆作用
2. Early tholeiitic and calc-alkaline arc magmatism of middle to Late Eocene Age in the southern Ogasawara (Bonin) forearc [J] . Satoru Haraguchi, Teruaki Ishii, Jun-Ichi Kimura Contributions to Mineralogy and Petrology . 2008,第5期

机译：小gas原南部（波宁）前中新世晚期至晚期钙化和钙碱性弧岩浆作用
3. Early tholeiitic and calc-alkaline arc magmatism of middle to Late Eocene Age in the southern Ogasawara (Bonin) forearc [J] . Satoru Haraguchi, Teruaki Ishii, Jun-Ichi Kimura Contributions to Mineralogy and Petrology . 2008,第2期

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Early tholeiitic and calc-alkaline arc magmatism of middle to Late Eocene Age in the southern Ogasawara (Bonin) forearc

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