Teshima pyroclastics: Onset of characteristic Setouchi magmatism induced by slab melting at 14.8 Ma

Teshima pyroclastics: Onset of characteristic Setouchi magmatism induced by slab melting at 14.8 Ma
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丰岛火山碎屑岩:由 14.8 Ma 板片熔化引起的典型濑户内岩浆活动的开始

DOI:
10.1111/iar.12378
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发表时间:
2020
期刊:
影响因子:
1.5
通讯作者:
Tatsumi Yoshiyuki
Tatsumi Yoshiyuki
中科院分区:
地球科学4区
文献类型:
--
作者:
Nakaoka Reina;Kado Soko;Hasegawa Shuichi;Suzuki‐Kamata Keiko;Ishizuka Osamu;Sekimoto Shun;Kawabata Hiroshi;Tatsumi Yoshiyuki

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介绍了日本西南部铁岛火山碎屑和上覆熔岩的Ar - Ar年龄、岩石学和地球化学特征。虽然以前的地质和年龄资料表明,特岛火山碎屑是在日本海弧后盆地打开约15 Ma时,与日本西南弧银条向南迁移有关的濑户内火山岩熔岩流形成之前的岩浆活动bbbb30年的产物,但目前的结果表明,在14.6-14.8 Ma期间,由板块熔融和随后的熔融-地幔反应引起的濑户内火山活动序列同时产生了火山碎屑和熔岩。这个年龄是迄今为止报道的年龄中最老的,可能代表了典型的濑户内岩浆活动开始的时间,紧接在包括日本西南弧条旋转在内的大构造事件之后,因此是大构造事件的结果。
Ar‐Ar ages, and petrographical and geochemical characteristics of pyroclastics and an overlying lava from Teshima Island, southwest Japan are presented. Although previous geological and age data suggested Teshima pyroclastics were products of magmatism > 3 my prior to lava flows of Setouchi volcanic rocks generated in association with southward migration of the southwest Japan arc sliver during opening of the Sea of Japan backarc basin at ~ 15 Ma, the present results led to the conclusion that a sequence of Setouchi volcanism, induced by slab melting and subsequent melt‐mantle reactions, produced both pyroclastics and lava at 14.6–14.8 Ma. This age is oldest among those reported so far and may represent the timing of onset of characteristic Setouchi magmatism immediately posterior to and hence as a result of the mega‐tectonic event including rotation of the southwest Japan arc sliver.
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