Silicic Magmas in the Izu–Bonin Oceanic Arc and Implications for Crustal Evolution
Silicic Magmas in the Izu–Bonin Oceanic Arc and Implications for Crustal Evolution
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DOI：
10.1093/petrology/egp017
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发表时间：
2008-12
影响因子：
3.9
通讯作者：
Y. Tamura;J. Gill;D. Tollstrup;H. Kawabata;H. Shukuno;Q. Chang;T. Miyazaki;Tsutomu Takahashi;Y. Hirahara;S. Kodaira;O. Ishizuka;Toshihiro Suzuki;Y. Kido;R. Fiske;Y. Tatsumi
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文献类型：
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作者：
Y. Tamura;J. Gill;D. Tollstrup;H. Kawabata;H. Shukuno;Q. Chang;T. Miyazaki;Tsutomu Takahashi;Y. Hirahara;S. Kodaira;O. Ishizuka;Toshihiro Suzuki;Y. Kido;R. Fiske;Y. Tatsumi
伊豆笠宁马里亚纳火山弧（IBM弧）从最早阶段（始新世）至今爆发出丰富的流纹岩。地球化学上，伊豆笠宁弧前部存在三种类型的第四纪流纹岩，它们与火山类型和地壳结构密切相关。火山前缘以玄武岩岛为主，产生少量流纹岩，我们称之为R1。火山前缘的海底破火山口主要喷发流纹岩，我们称之为R2。弧后伸展带的海山、丘陵和枕脊大多是玄武岩，但也含有流纹岩，我们称之为R3。最厚的总地壳和最厚的中间成分中地壳出现在以玄武岩为主的火山下方，而中间成分中地壳往往是薄的海底破火山口下方。 R1 流纹岩可能源自第四纪安山岩，而 R2 和 R3 流纹岩可能源自渐新世。CaO/Al 较高
Abundant rhyolitehaseruptedfromthe Izu^Bonin^Marianavolca-nic arc (IBM arc) from its earliest stage (Eocene) to the present.Geochemically, three types of Quaternary rhyolites exist in the Izu^Bonin arcfront, and theyare closely related tovolcanotypeand crus-tal structure.The dominantly basaltic islands of the volcanic frontproduce small volumes of rhyolites that we call R1.The submarinecalderas of the volcanic front erupt mostly rhyolite that we call R2.Seamounts, knolls, and pillow ridges in thebackarcextensionalzoneare mostly basaltic but also contain rhyolites that we call R3.Thethickest total crust, and the thickest intermediate compositionmiddle crust, occurs below the dominantly basaltic volcanoes,whereas the intermediate composition middle crust tends to be thin-nerbeneaththesubmarinecalderas. R1rhyolitesmaybederivedfromQuaternary andesitic sources whereas R2 and R3 rhyolites may bederivedfromOligoceneones.ThehigherCaO/Al