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Carnian reefal blocks in the Slovenian Basin, eastern Southern Alps

机译：南阿尔卑斯山东部斯洛文尼亚盆地的卡尔尼礁

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摘要

The Carnian Amphiclina beds of the eastern Southern Alps mostly consist of shale and sandstone deposited in the deep-marine Slovenian Basin, which was located near the western margin of the Meliata Ocean. In the vicinity of Cerkno (Slovenia), blocks of massive or crudely bedded limestone crop out within a succession of clastic rocks that are several hundred meters thick. Sponge-microbialite boundstone and coral pillarstone are the predominant facies within these blocks. Oncoid floatstone-rudstone and moderately sorted peloid packstone form crudely layered parts of the blocks, whereas intraclast-cortoid packstone and poorly sorted peloid packstone occur locally in cross-stratified thin beds, truncated at block margins. Detailed mapping further shows that limestone blocks form units at discrete stratigraphic levels within shale and that these units are variable in thickness. Whereas the largest blocks mostly lie concordant to the bedding, smaller blocks are poorly sorted and randomly oriented. All of this evidence suggests that the limestone blocks are olistoliths, derived from an outer platform margin and/or uppermost slope.
机译：南阿尔卑斯山东部的Carnian Amphiclina床主要由沉积在Meliata海洋西缘附近的深海斯洛文尼亚盆地的页岩和砂岩组成。在塞尔科诺（斯洛文尼亚）附近，块状或粗质层状石灰岩块在一系列几百米厚的碎屑岩中生出。海绵-微辉石界石和珊瑚柱石是这些区块中的主要相。瘤状浮石—灰质石和适度分类的鹅卵石堆积石形成了块体的粗层部分，而碎屑岩皮质类堆积石和分类不良的鹅卵石堆积石局部出现在交叉分层的薄层中，在块体边缘被截断。详细的映射进一步显示，石灰岩块在页岩内形成离散地层的单元，并且这些单元的厚度是可变的。尽管最大的砖块大多与铺垫相一致，但是较小的砖块排序较差且方向随机。所有这些证据表明，石灰岩块体是橄榄石，来自外部平台边缘和/或最上层的斜坡。

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