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首页> 外文期刊>Journal of Asian earth sciences >Reconstructed oceanic plate stratigraphy of the Ino Formation in the Ino district, Kochi prefecture, central Shikoku, Japan
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Reconstructed oceanic plate stratigraphy of the Ino Formation in the Ino district, Kochi prefecture, central Shikoku, Japan

机译：日本四国中部高知县井野地区井野组大洋板块地层重建

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摘要

The Ino Formation, which has been regarded as a member of the Kurosegawa terrane, is distributed in the Ino district, central Shikoku, Japan. It is composed of metamorphosed and unmetamorphosed rocks. Radiolarians in the Late Triassic to Early Jurassic strata are found in the unmetamorphosed components. The Late Triassic radiolarians were collected from chert and siliceous mudstone. The Early Jurassic radiolarians are discriminated from the siliceous mudstone and mudstone samples. Based on chronological data and findings from previous studie, the Oceanic Plate Stratigraphy (OPS) of the unmetamorphosed part of the Ino Formation is reconstructed as follows: Late Carboniferous to Late Triassic (or earliest Jurassic) bedded chert, Late Triassic (late Carnian) to Early Jurassic siliceous mudstone and Early Jurassic mudstone in ascending order. Based on this observation, it is confirmed that the unmetamorphosed part of the Ino Formation is an Early Jurassic accretionary complex. Its origin can be attributed to the Chichibu terrane. The reconstructed OPS of the unmetamorphosed part of the Ino Formation is possibly correlated to the Yusugawa, Sumaizuku and Kamiyoshida units of the Northern Chichibu terrane or the unknown oldest unit of the Southern Chichibu terrane.
机译：井上编队被认为是黑濑川地层的一员，分布在日本四国中部井上地区。它由变质岩和未变质岩组成。在未变质的组分中发现了晚三叠世至早侏罗世地层的放射虫。三叠纪晚期的放射虫是从石和硅质泥岩中收集的。早侏罗世的放射虫与硅质泥岩和泥岩样品有所区别。根据年代学数据和先前研究的发现，对伊诺组未变质部分的大洋板块地层（OPS）进行了以下重建：晚石炭纪至晚三叠世（或侏罗纪最早）层状硅质，石，晚三叠世（晚Carnian）至早侏罗世硅质泥岩和早侏罗世泥岩按升序排列。基于该观察结果，可以确认，井上地层的未变质部分是侏罗纪早期的增生复合体。它的起源可以归因于Chichibu地形。 Ino组未变质部分的重建OPS可能与北秩父地层的Yusugawa，Sumaizuku和Kamiyoshida单元或南部秩父地层的未知最古老单元有关。

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