Geochemical contrast between the Sanbagawa psammitic schists (Oboke unit) and the Cretaceous Shimanto sandstones in Shikoku, Southwest Japan and its geologic significance
Geochemical contrast between the Sanbagawa psammitic schists (Oboke unit) and the Cretaceous Shimanto sandstones in Shikoku, Southwest Japan and its geologic significance
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日本西南部四国三波川砂岩片岩（大步危单元）与白垩系四万十砂岩的地球化学对比及其地质意义
DOI：
10.1046/j.1440-1738.1999.00248.x
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发表时间：
1999
期刊：
影响因子：
1.5
通讯作者：
T. Matsuura
中科院分区：
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作者：
K. Kiminami;Asami Hamasaki;T. Matsuura
摘要对四国地区白垩系石曼托超群砂岩和奥博克组沙质片岩进行了系统的地球化学研究，以厘清奥博克组沙质片岩原岩的沉积时代。地球化学资料，连同年代和地质资料，得出以下结论：(i)推断奥博克沙质片岩的变质作用相当于四国东部坎帕期海沟沉积的石曼托增生杂岩Hiwasa组的砂岩。（ii）原岩在沉积后2000万年达到最大变质条件。(3)海沟区大量粗粒碎屑沉积物的堆积引起了俯冲带沉积物的刮离和底沉，分别形成了Hiwasa组和Oboke组。
Abstract A systematic geochemical study of sandstones from the Cretaceous Shimanto Supergroup and psammitic schists from the Oboke unit in Shikoku has been carried out in order to clarify the depositional age of the protoliths of the Oboke psammitic schists. The geochemical data, together with chronological and geologic data, led to the following conclusions. (i) It is inferred that Oboke psammitic schists are metamorphically equivalent to sandstones in the Hiwasa Formation of the Shimanto accretionary complex, deposited in a trench area during the Campanian, in eastern Shikoku. (ii) The protolith attained to maximum metamorphic conditions within 20 million years after the deposition. (iii) The accumulation of a large amount of coarse‐grained clastic sediments in the trench area induced offscraping and underplating of the sediments in the subduction zone, forming the Hiwasa Formation and Oboke unit, respectively.
Hara, I.、Shiota, T.、Hide, K.、Okamoto, K.、Takeda, K.、Hayasaka, Y. 和 Sakurai, Y.：“三波川带的推覆结构”。
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Roser, B.P.：“砂岩地球化学、来源和构造环境：2-粒度对 Al2O3/SiO2-碱度指数图的影响，以及在新西兰再生和中级变质地体中的应用”地球科学。
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