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Distribution and formation mechanism of lime mudstone in Upper Triassic in northwestern Sichuan, China

机译：川西北地区上三叠统石灰岩的分布与形成机理

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The lime mudstone in the oolites of the Upper Triassic Maantang formation has not been examined in detail by many geologists though the intraclast-bearing lime mudstone is obviously different from the underlying and overlying gray oolitic layers in northwestern Sichuan Basin, China. This study presents an interpretation of four newly measured stratigraphic sections for investigating the distribution and thickness of the lime mudstone. The distribution of the lime mudstone is discontinuous, and the deposits vary in thickness. The lime mudstone occurs as lentoids or bands of approximately 0.2–2 m in thickness and ranges in length from about 5 m to more than 30 m in length in the outcrops. Similar complexes occur in other places in the world although there are regional and site-specific variances. However, the phenomenon in the Maantang mudstone formation seems most like those of the modern Bahama bank. The lime mudstone of Maantang is assumed to have formed by sequential historic storms of great strength, much as did the similar Bahama deposits.
机译：尽管三叠纪含钙灰泥岩明显不同于中国四川盆地西北部的下伏和上覆灰色橄榄岩层，但许多地质学家并未对上三叠统Maantang地层的橄榄岩中的石灰岩进行详细的研究。这项研究对四个新测量的地层剖面进行了解释，以研究石灰岩的分布和厚度。石灰泥岩的分布不连续，沉积物的厚度也不同。石灰质泥岩以柱状体或带状存在，厚度约为0.2–2 m，在露头的长度范围从5 m到30 m以上。尽管存在区域和特定地点的差异，但在世界其他地方也有类似的复杂事件。但是，Maantang泥岩地层中的现象似乎最像现代巴哈马河岸的现象。假设Maantang的石灰岩是由相继的历史性强风暴形成的，就像类似的Bahama矿床一样。

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