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首页> 外文期刊>Journal of Asian earth sciences >Middle-Late Devonian radiolarians from Klaeng District, Rayong Province, southeastern Thailand: Geotectonic significance of the Rayong area as a continental margin of the Sibumasu Block
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Middle-Late Devonian radiolarians from Klaeng District, Rayong Province, southeastern Thailand: Geotectonic significance of the Rayong area as a continental margin of the Sibumasu Block

机译：来自泰国东南部罗勇府Klaeng区的中晚期泥盆纪放射虫：罗勇地区作为Sibumasu块大陆边缘的大地构造意义

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摘要

A fine clastics-siliceous succession exposed at Laem Krabang Phet, approximately 20 km southwest of Klaeng, Rayong area, southeastern Thailand was examined based on lithology, radiolarian biostratigraphy, and geological correlation. In the study section, thinly bedded chert layers are intercalated with black carbonaceous shale, light-colored tuffaceous shale, brown glassy tuff, and quartz-rich sandstone layers. A horizon of the chert in the section yielded poorly preserved radiolarians, however, several forms including Palaeoscenidium cladophorum Deflandre, Stigmosphaerostylus cf. pusilla (Hinde), and Entactiniidae gen. et spp. indet. were identified. This fauna is probably referable to the Middle-Late Devonian. The study section had been assigned to various stratigraphic units, such as Silurian-Devonian or Carboniferous-Permian, due to a poor fossil occurrence. However, the occurrence of the Devonian radiolarians in this study provides concrete evidence for the sedimentary age of the succession, and supports assignment to the Silurian-Devonian. Although the study succession exposed at Laem Krabang Phet is coeval with the Devonian part of the Fang chert, northern Thailand, the lithological assemblage is dissimilar, and the post-Devonian radiolarian chert is absent. These lithological, chronological, and stratigraphic results indicate that the depositional environment of the study section was close to the continental margin, such as a continental slope or rise. (C) 2014 Elsevier Ltd. All rights reserved.
机译：根据岩性，放射虫生物地层学和地质相关性，研究了在泰国东南部罗勇地区Klaeng西南约20公里处的Laem Krabang Phet露出的细碎屑-硅质演替。在研究部分中，薄层的石层插有黑色碳质页岩，浅色凝灰质页岩，棕色玻璃凝灰岩和富含石英的砂岩层。该断面中的the石层位保存不善的放射虫，但是有几种形式，包括古生的阴叶蕨类植物，Stigmosphaerostyluscf。 pusilla（Hinde）和Entactiniidae gen。等。 indet。被确定。该动物群可能是泥盆纪晚期。由于化石的不良发生，研究部分已分配给各种地层单位，例如志留系-泥盆系或石炭-二叠系。但是，本研究中泥盆纪放射虫的出现为该演替的沉积年龄提供了具体证据，并支持了志留纪-德文统的划分。尽管在Laem Krabang Phet上进行的研究演替与泰国北部方格菱格的泥盆纪时期相近，但岩性组合却不相同，并且后德文尼亚的放射l石也不存在。这些岩性，时间和地层结果表明，研究剖面的沉积环境接近大陆边缘，例如大陆倾斜或上升。 （C）2014 Elsevier Ltd.保留所有权利。

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