首页> 外文期刊>Estonian Journal of Earth Sciences >Allogenic succession in Late Ordovician reefs from southeast China: a response to the Cathaysian orogeny
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Allogenic succession in Late Ordovician reefs from southeast China: a response to the Cathaysian orogeny

机译:中国东南部奥陶纪晚礁的异相演替:对华夏造山运动的回应

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摘要

Several Late Ordovician (late Katian) reef complexes are known from the border area of Jiangxi and Zhejiang provinces in southeast China. We studied two coral-stromatoporoid reefs exposed in the Xiazhen Formation at Zhuzhai (Yushan, Jiangxi). The reefs have a combined thickness of 7.4 in and are metazoan-dominated with most reef-builders in growth position. Stromatoporoids and tabulate corals constitute the framework of the reefs. Stromatoporoids (mostly Clathrodictyon) dominate the first unit and show a vertical increase in proportion and dominance from the middle part to the top of the unit, whereas tabulate corals (dominated by Catenzpora and Agetolites) are the main reef-builders in the second unit where stromatoporoids are rare. We attribute this change to a greater tolerance of tabulate corals to turbidity, allowing them to thrive in the muddy facies of the upper unit. This facies change is probably related to the increasing terrestrial input from the northwestward expansion of the Cathaysian Land during the late Katian. The Cathaysian orogeny also led to a short-term exposure of the sea floor in the study area, which terminated the reef growth.
机译:在中国东南部的江西和浙江两省的交界处,已知有数个晚奥陶世(加田晚期)珊瑚礁群。我们研究了珠寨(江西玉山)下镇组露出的两个珊瑚-间质孔礁。礁石的总厚度为7.4英寸,是后生的,大部分礁石建造者处于生长位置。基质类和表型珊瑚构成了礁石的框架。基质类类动物(主要是笼形龙)在第一单元中占主导地位,并从单元的中部到顶部显示出比例和优势的垂直增加,而列表珊瑚(由Catenzpora和Agetolites主导)是第二单元中主要的造礁者。基质多孔是罕见的。我们将这种变化归因于列表珊瑚对浊度的更大耐受性,使它们能够在上部单元的泥质相中生长。这种相变可能与凯田晚期凯特西亚大陆向西北扩展的地面输入增加有关。华夏造山运动还导致研究区域的海床短期暴露,从而终止了珊瑚礁的生长。

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