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首页> 外文期刊>Journal of Asian earth sciences >Provenance of a Permian accretionary complex (Nishiki Group) of the Akiyoshi Belt in Southwest Japan and Paleogeographic implications
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Provenance of a Permian accretionary complex (Nishiki Group) of the Akiyoshi Belt in Southwest Japan and Paleogeographic implications

机译：日本西南部秋吉带二叠纪增生复合体（锦集团）的起源及其古地理意义

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摘要

The Akiyoshi Belt in the Inner Zone of Southwest Japan is made up of a Permian accretionary complex, the main component of which is the Late Permian Nishiki Group that mainly consists of sandstone, mudstone, felsic tuff and a minor amount of chert and conglomerate. We employ multiple methods, which includes sandstone petrography, detrital garnet composition and detrital zircon U-Pb dating to investigate the likely sources of these terrigenous deposits and to reconstruct the paleogeographic link between the proto-Japan and the East Asian continent. The highly immature Late Permian sandstones are interpreted to derive from multi-type source rocks that include felsic igneous rocks, basalts, sedimentary rocks and low to medium-grade metamorphic rocks in proximal locations. The detrital zircon U-Pb results show that all samples contain a dominant Early to Late Permian zircon population (294-254 Ma) and these zircons are interpreted to be derived from an active volcanic arc, which was most likely caused by subduction of the Paleo-Pacific plate beneath the South China Block. We found that spessartine-rich almandine garnets and almandine garnets dominated assemblages in the lower unit changed to grossular-andradite garnets dominated assemblage in the upper unit, which was caused by a progressive uplifting and denudation of the Permian volcanic arc.
机译：日本西南部内陆地区的秋吉带由二叠纪增生复合体组成，其主要成分是二叠纪后期锦锦群，主要由砂岩，泥岩，长岩凝灰岩和少量的of石和砾岩组成。我们采用多种方法，包括砂岩岩相学，碎屑石榴石成分和碎屑锆石U-Pb测年，以调查这些陆源矿床的可能来源，并重建日本古迹与东亚大陆之间的古地理联系。高度不成熟的晚二叠世砂岩被解释为来源于多种类型的烃源岩，包括长石质火成岩，玄武岩，沉积岩和近端中低等变质岩。碎屑锆石的U-Pb结果表明，所有样品均包含占主导地位的早二叠世至晚二叠纪锆石种群（294-254 Ma），这些锆石被解释为源自活跃的火山弧，这很可能是由古俯冲引起的-华南区块下的太平洋板块。我们发现，在下部单元中，富含塞巴司汀的金刚烷石榴石和铝金刚烷石榴石占主导地位的组合，而在上部单元中的组合由刚玉-榴辉石石榴石主导，这是由二叠纪火山弧的逐渐抬升和剥蚀引起的。

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