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首页> 外文期刊>Facies >Microbial-, fusulinid limestones with large gastropods and calcareous algae: an unusual facies from the Early Permian Khao Khad Formation of Central Thailand
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Microbial-, fusulinid limestones with large gastropods and calcareous algae: an unusual facies from the Early Permian Khao Khad Formation of Central Thailand

机译：微生物 - ，富疮性石灰岩，具有大型胃胆碱和钙质藻类：来自泰国中部初二叠汗Khah Khad形成的异常相片

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The Early Permian (Kungurian) Khao Khad Formation of Central Thailand consists mostly of carbonates deposited on the western margin of the Indochina Terrane. This formation has yielded unusual microbial-fusulinid limestones with large gastropods which contribute most to the rock volume. With a height of more than 6 cm, the gastropods are amongst the largest Early Permian gastropods ever reported. Gastropods as major rock formers are rare in the Palaeozoic. This, and other recently reported invertebrate faunas from Thailand show that gastropods may dominate Permian fossil assemblages not only in diversity, but also regarding abundance and in some cases also regarding biomass. Besides gastropods, fusulinids, various calcareous algae, intraclasts and thick microbial-cyanobacterial (GirvanellaandArchaeolithoporella) coatings and reticular microbial patches as well as thick inter- and intragranular radial fibrous cement crusts are present. The gastropods represent at least four species and belong probably to undescribed taxa. The fusulinid genusPseudofusulinaandMisellina (M.)termieriare reported from the Khao Khad Formation for the first time and indicate a Bolorian age. Calcareous algae are dominated by dasycladaceans followed by gymnocodiaceans and solenoporaceans. The studied limestone almost completely lacks metazoan reef builders such as corals and sponges. Likewise, brachiopods and bivalves are absent in the studied samples and echinoderms are very scarce. The carbonate is interpreted as product of shallow water, back-reef lagoonal platform community with a high productivity providing the large gastropods with sufficient food. However, conditions were too eutrophic for sessile filter feeders including metazoan reef builders.
机译：泰国中部的早期二叠纪（Kungurian）Khao Khad形成主要包括沉积在印度吲哚替纳地区的西部边缘的碳酸盐。这种形成产生了不寻常的微生物 - 富疮性石灰石，具有大的胃细胞，对岩石数量贡献。高度超过6厘米，胃食不容是曾在曾有的最大早期二叠系腹具中报道的。腓甲胃肠杆菌在猴年中很少见。此外，最近报道的其他来自泰国的无脊椎动物鳄鱼表明，胃具不仅可以在多样性中占据多元化化石组合，而且还可以在一些关于生物量的情况下占据丰富，也可以占据丰富。除了胃肠杆糖，肥香，各种钙质藻类，颅内腺和厚微生物 - 蓝藻（GirvanellaAndarchakeoporella）涂料以及网状微生物贴片以及厚的间隙和腔内径向纤维状斑块。美食od表示至少四种物种，可能属于未描述的分类群。 Fusulinid Genuspseudofusulinaandmisellina（M.）Termieria在Khao Khad形成首次，表明了鲍尔人的年龄。钙质藻类由Dasycladaceans占主导地位，然后是Gymnocodeans和Solenoporaceans。学习的石灰石几乎完全缺乏珊瑚和海绵等美容礁制造商。同样，在研究的样品中不存在Brachiopods和双抗体，并且棘皮胚层非常稀缺。碳酸盐被解释为浅水的产物，背礁泻湖平台群落具有高生产率，提供具有足够食物的大型胃脂。然而，对于包括美联珊瑚礁制造商的术骨过滤器，条件过于富营养化。

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