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首页> 外文期刊>Bulletin of Canadian Petroleum Geology >Origin and evolution of lower Paleozoic reefs in the Pechora Urals, Russia
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Origin and evolution of lower Paleozoic reefs in the Pechora Urals, Russia

机译：俄罗斯伯朝拉乌拉尔下古生代珊瑚礁的起源和演化

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摘要

The Middle Ordovician to Lower Devonian (Caradoc-Lower Emsian) carbonates are the oldest and most widely preserved shallow water carbonate strata of the Pechora Urals. Several episodes of reef growth are evident within these strata. The rather well-preserved buildups in shelf, shelf-margin and slope settings provide important insights into the intrinsic and extrinsic processes that affected reef growth along the lower Paleozoic, northeastern European Platform passive margin. Massive corals, branching bryozoans, crinoids and red algae formed bioherms on a carbonate ramp. Hemispherical and laminar stromatolites formed on bioclastic substrates in backreef and lagoonal environments. Small biostromes and bioherms were constructed by ramose corals, stromatoporoids, calcified microbes, crinoids, and diverse shelly metazoa in various shelf-to-basin carbonate settings. Encrusting cyanoacteria and calcified microbes formed microbial boundstone and stromatolites in both isolated and barrier reefs. Microbes, calcareous algae, ramose corals, problematic hydroids and stromatoporoids were the primary builders of the barrier reefs. These organisms are associated with high-diversity assemblages of brachiopods and bivalves. The lower Paleozoic European Platform was overall progradational and features an evolution from a ramp-to-rimmed platform. Initially, reefs on this platform were constructed by a low diversity community, but through the lower Paleozoic, reef builder diversity and reef community complexity increased.
机译：中奥陶世至下泥盆世（Caradoc-Lower Emsian）碳酸盐岩是伯朝拉乌拉尔最古老、保存最广泛的浅水碳酸盐岩地层。在这些地层中，珊瑚礁的几次生长是显而易见的。在大陆架、大陆架边缘和斜坡环境中保存相当完好的堆积物为影响下古生代东北欧平台被动边缘珊瑚礁生长的内在和外在过程提供了重要的见解。巨大的珊瑚、分枝的苔藓虫、海藻和红藻在碳酸盐斜坡上形成了生物群落。半球形和层状叠层石形成于后礁和泻湖环境中的生物碎屑基质上。小型生物群落和生物群落是由拉莫斯珊瑚、叠层孔菌、钙化微生物、类海龟和各种贝壳后生动物在各种陆架到盆地的碳酸盐环境中构建的。结壳的蓝藻和钙化微生物在孤立礁和堡礁中形成了微生物界石和叠层石。微生物、钙质藻类、拉莫斯珊瑚、有问题的水螅和叠层孔菌是堡礁的主要建造者。这些生物与腕足类和双壳类的高多样性组合有关。下古生代欧洲地台总体上是渐变的，其特点是从斜坡到边缘地台的演变。最初，该平台上的珊瑚礁是由低多样性群落构建的，但通过下古生代，珊瑚礁建造者的多样性和珊瑚礁群落复杂性增加。

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  • 来源
    《Bulletin of Canadian Petroleum Geology》 |1999年第2期|85-103|共19页
  • 作者

    A. I. Antoshkina;

  • 作者单位

    Institute of Geology, Komi Science Centre Uralian Division of the Russian Academy of Sciences Syktyvkar, 167610, 54 Pervomayskaya St, Russia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 地质学;石油、天然气工业;
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