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Bio-mineral needle fiber calcite (NFC) in Tunisian Pleistocene calcretes (topology and crystallization)
Journal of Earth System Science ( IF 1.9 ) Pub Date : 2021-02-05 , DOI: 10.1007/s12040-020-01528-4
Faouzia Tlili , Asma Ayari , Kamel Regaya

Abstract

The microfacies of Pleistocene calcareous crust in Tunisia revealed the presence of diverse aspects of acicular crystallizations in a porous system. These crystallizations are in the shape of branched filaments, mono or polycrystalline rods which are either smooth or serrated (calcite), and serrated edge needle (calcium oxalate). The genesis of these acicular structures seems to be directly or indirectly linked to the organic activity. In fact, the facies are tied to the biological activity or biochemical interactions, which occur between living organisms and the mineral (calcite), triggering a succession of precipitation and dissolution reactions. These reactions, which are characteristic of vadose environments, have actively contributed to the endurance of calcareous crusts due to premature or delayed diagenesis. The acicular calcite, found in the Tunisian Pleistocene calcretes, reflects regional climates that influence the form and mineralogy of needle fiber calcite.

Research Highlights

  • Diverse aspects of acicular crystallizations in the microfacies of Pleistocene calcareous crusts investigated.

  • The needle fiber calcite has different origins, which may be biogenic, physicochemical or organic.

  • The form and mineralogy of the needle fiber calcite are affected by the environment and climate change.

  • The lithogenesis of the crusts is influenced by the redistributions and the organizations of the needle fiber calcite.



中文翻译:

突尼斯更新世cal石中的生物矿物针状纤维方解石(NFC)(拓扑和结晶)

摘要

突尼斯的更新世钙质壳微相揭示了多孔系统中针状结晶的不同方面。这些结晶为分支细丝,光滑或锯齿状(方解石)的单晶或多晶棒以及锯齿状边缘针状(草酸钙)的形状。这些针状结构的起源似乎与有机活性直接或间接相关。实际上,这些相与在活生物体和矿物(方解石)之间发生的生物活性或生化相互作用有关,从而触发了一系列的沉淀和溶解反应。这些反应是渗流环境的特征,由于过早或延迟的成岩作用,对钙质结壳的耐久性起了积极作用。针状方解石

研究重点

  • 研究了更新世钙质结壳微相中针状结晶的不同方面。

  • 针状纤维方解石具有不同的起源,可能是生物成因,物理化学或有机的。

  • 针状纤维方解石的形式和矿物学受到环境和气候变化的影响。

  • 地壳的岩性作用受针状纤维方解石的重新分布和组织的影响。

更新日期:2021-02-05
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