Larger benthic and planktonic biostratigraphy and facies of Albian sediments in Coastal Fars Zone (Zagros area, south-west Iran),Geological Journal

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Larger benthic and planktonic biostratigraphy and facies of Albian sediments in Coastal Fars Zone (Zagros area, south-west Iran)
Geological Journal ( IF 1.4 ) Pub Date : 2021-06-28 , DOI: 10.1002/gj.4200
Mojtaba Keshavarzi _{1,

2} , Massih Afghah ₂ , Abdolmajid Asadi ₂ , Mahnaz Parvaneh Nejad Shirazi ₃

Affiliation

A total of 64 samples were collected from the Kazhdumi Formation (Albian) of south Zagros Basin (Coastal Fars Zone) in order to study the biostratigraphy and analyse the lithofacies. Stratigraphic distribution of identified larger benthic and planktonic foraminifers has confirmed the presence of three successive biozones: Mesorbitolina subconcava-Orbitolina discoidea Zone, Favusella washitensis Zone followed by an upper Conicorbitolina conica-Mesorbitolina parva Zone. Generally, orbitolinids are well developed in the Albian succession in the studied section, whereas the stratigraphic distribution of planktonic foraminifers is more restricted, dominating the Favusella washitensis Zone. Nevertheless, microscopic investigation recognizes five microfacies consisting of extraclast-foraminifer packstone, peloid-intraclast Orbitolina wackestone, foraminiferal plankton wackestone, intraclast-Orbitolina grainstone, and coral-rudist wackestone, which indicated a shallow water carbonates palaeoenvironment (intertidal, lagoon, bar) and open marine. The alternation of both planktic and benthic foraminifera through the Kazhdumi Formation confirms a rapid transgression and regression in the studied section during Albian time, which is attributed to Kazerun basement fault behaviour in the mentioned time interval.

中文翻译：

沿海法尔斯区（伊朗西南部扎格罗斯地区）阿尔比沉积物的较大底栖和浮游生物地层学和相

为了研究生物地层和分析岩相，从扎格罗斯盆地南部（法尔斯海岸带）的 Kazhdumi 组（阿尔比安）共采集了 64 个样品。已确定的较大底栖和浮游有孔虫的地层分布证实了三个连续生物区的存在：Mesorbitolina subconcava - Orbitolina discoidea区，Favusella Washitensis区，然后是上部Conicorbitolina conica - Mesorbitolina parva区。总体而言，在研究剖面的阿尔比层序中，眼眶生物发育良好，而浮游有孔虫的地层分布较为受限，以Favusella Washitensis 为主区。尽管如此，显微镜研究还是发现了五种微相，包括碎屑外-有孔虫颗粒岩、球状-内壳 Orbitolina wackestone、有孔虫浮游生物 wackestone、inclast -Orbitolina 颗粒岩和珊瑚-rudist wackestone，这表明浅水碳酸盐古环境（潮间带、泻湖、酒吧）和开放海洋。浮游和底栖有孔虫通过 Kazhdumi 组的交替证实了阿尔布时期研究剖面的快速海侵和回归，这归因于上述时间间隔内的 Kazerun 基底断层行为。

更新日期：2021-09-02

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