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Anatomy, internal heterogeneities, and early fracture network of a Pleistocene carbonate coastal dune (Rejiche Formation, southeastern Tunisia)

机译：更新世的碳酸盐岩沿海沙丘（突尼斯东南部的Rejiche组）的解剖学，内部非均质性和早期断裂网络

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摘要

Although eolian deposits are known to record the dominant winds, secondary conditions such as wind reversals during wintertime can also be observed in the petrographic composition and facies succession. Thus, eolian deposits are used here as a local paleoclimatic proxy. The spatial distribution of the depositional facies, early diagenetic imprints, and early fracture network of a coastal Pleistocene eolian ridge in southeastern Tunisia is described using a small-scale GIS model. Facies analysis indicates that coastal dune systems record seasonal cycles. The fracture density and directions are strongly influenced by the depositional facies type. Laminated facies present a higher fracture density compared to more homogeneous facies and show only one major fracture direction, while the more homogeneous facies display a bimodal distribution. Such a difference between these two groups is explained by the heterogeneous distribution of the early calcite cement within the laminated facies. No tectonic activity or overlying strata have affected the Pleistocene dunes under study. Therefore, the mechanism responsible for the fractures could only be related to the own weight of the eolianite and to its internal or underlying lithologic heterogeneity.
机译：尽管已知风积沉积可记录主要风，但在岩相组成和相序上也可以观察到诸如冬季逆风之类的次要条件。因此，风积物在这里被用作当地的古气候代用物。使用小型GIS模型描述了突尼斯东南部沿海更新世风积脊的沉积相，早期成岩印记和早期断裂网络的空间分布。相分析表明，沿海沙丘系统记录了季节性周期。裂缝的密度和方向受沉积相类型的强烈影响。与更均匀的相相比，层状相具有更高的裂缝密度，并且仅显示一个主要裂缝方向，而更均匀的相则显示出双峰分布。两组之间的这种差异可以通过层状相内部早期方解石水泥的非均质分布来解释。没有构造活动或上覆地层影响正在研究的更新世沙丘。因此，造成裂缝的机理仅与风成岩的自重及其内部或下伏的岩性非均质性有关。

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