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首页> 外文期刊>Facies >Cambrian to Lower Ordovician reefs on the Yangtze Platform, South China Block, and their controlling factors
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Cambrian to Lower Ordovician reefs on the Yangtze Platform, South China Block, and their controlling factors

机译：华南地块扬子台地寒武纪至下奥陶统珊瑚礁及其控制因素

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摘要

The Yangtze Platform, South China Block, maintained an epicontinental sea in the Cambrian and Ordovician with oldlands surrounding its northern and western margins and a southeastern slope belt. Many Cambrian to Lower Ordovician reef complexes are known from the Yangtze Platform for which an updated spatiotemporal framework is provided, their biotic composition and architecture is presented, and the reef development is discussed in a global context. The biotic structures of reef units on the Yangtze Platform largely match the evolutionary pattern in terms of composition and architecture. Microbes and calcareous algae are key components in all reefs but metazoan reef-builders are better suited to identifying macroevolutionary patterns. Large-scale dolomitization in Cambrian Series 4 on the one hand prevents recognition of metazoan reefs and on the other hand may indicate hypersaline environments, which prevented metazoan reef growth and only permitted small-scale stromatolites in a few regions. Ordovician metazoans appear to have played substantial roles in reef-building earlier on the Yangtze Platform than elsewhere. Specifically bryozoan and Calathium-lithistid sponge reefs diversified during the Early Ordovician. Climate and eustatic sea-level changes and their related impact on water energy, turbidity, and salinity determined the growth and demise of reefs. The morphology and arrangement of reefs were controlled by the topography of the sea floor.
机译：扬子平台（华南地块）在寒武纪和奥陶纪保持了陆上大陆海，其北部和西部边缘环绕着旧地，并形成了东南斜坡带。扬子平台已知许多寒武纪至下奥陶纪的珊瑚礁复合体，为此提供了一个更新的时空框架，介绍了它们的生物组成和构造，并在全球范围内讨论了珊瑚礁的发展。扬子平台上礁石单元的生物结构在组成和构造上与进化模式基本吻合。微生物和钙质藻类是所有珊瑚礁的关键组成部分，但后生动物的造礁者更适合识别宏观进化模式。寒武纪4系列的大规模白云石化一方面阻止了对后生礁的识别，另一方面可能指示了高盐环境，这阻止了后生礁的生长，仅允许在少数地区使用小型叠层石。在长江平台上，奥陶纪后生动物似乎在珊瑚礁建设中起着重要作用，比其他地方早。特别是早奥陶世时期，苔藓虫和钙质卵石海绵礁多样化。气候和欣喜的海平面变化及其对水能，浊度和盐度的相关影响决定了珊瑚礁的生长和灭绝。珊瑚礁的形态和排列受到海床地形的控制。

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