Laffitteina from the Maastrichtian-Thanetian shallow marine carbonates of the Aures Basin (Northeastern Algeria): microfacies and stratigraphic distribution

IF 0.5 4区地球科学 Q4 GEOLOGY Boletin De La Sociedad Geologica Mexicana Pub Date : 2023-04-15 DOI:10.18268/bsgm2023v75n1a071022

Sana Benmansour

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Abstract

The Maastrichtian-Thanetian Ncham Member of the Aurès Basin in northeastern Algeria contains variably lenticular microfossils, which are defined as Laffitteina genera. It is a large benthic foraminifera, studied from three stratigraphic sections. The systematic study of Laffitteina led identification of nine species, four of which, Laffitteina marsicana, L. aff. mengaudi, L. monodi and L. erki were recorded for the first time in the study area. Various species of Laffitteina were used as index fossils to recognize the K/Pg transition in the Aurès Basin. The last occurrence of L. oztuerki marks the end of the Maastrichtian, which was found in association with Omphalocyclus macroporus (Lamarck) in the upper Maastrichtian. The first occurrence of L. erki marks the Thanetian age, while the Danian and Selandian deposits are missing in the field after a general emersion in the early Paleocene, despite the absence of a visible non unconformity. It could therefore be proposed that the K/Pg transition may occurs in the last 10 m of the Ncham Member. Concerning the paleoenvironment, Laffitteina is considered as a resistant foraminifera and thrives in meso- to eutrophic environments (lagoon). Microfacies data from the Upper Cretaceous-Lower Paleogene limestones of the Aurès Basin suggests a carbonate platform with shallowing-up sequential organization, mainly controlled by fluctuations in sea-level.

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阿尔及利亚东北部Aures盆地马斯特里赫特-塔尼提浅海碳酸盐岩中的Laffitteina:微相与地层分布

阿尔及利亚东北部Aurès盆地的马斯特里赫特阶Thanetian-Ncham段包含各种透镜状微体化石，这些微体化石被定义为Laffintteina属。它是一种大型底栖有孔虫，从三个地层剖面进行了研究。通过对Laffintteina的系统研究，鉴定出9个物种，其中4个为Laffintteinamarsicana、L.aff。在研究区内首次记录到蒙古乳杆菌、单胞乳杆菌和erki乳杆菌。Laffintteina的各种物种被用作识别Aurès盆地K/Pg过渡的索引化石。oztuerki L.oztuerki的最后一次出现标志着马斯特里赫特阶的结束，该阶与上马斯特里赫特期的大孔虫（Lamarck）有关。L.erki的首次出现标志着Thanetian时代，而在古新世早期普遍出现后，尽管没有可见的不整合面，但该地区的Danian和Selandian矿床却不见了。因此，可以提出K/Pg转变可能发生在Ncham段的最后10m。就古环境而言，Laffintteina被认为是一种具有抗性的有孔虫，在中-富营养化环境（泻湖）中繁殖。Aurès盆地上白垩纪-下古近系石灰岩的微相数据表明，碳酸盐岩平台具有变浅的序列组织，主要受海平面波动控制。

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来源期刊

Boletin De La Sociedad Geologica Mexicana GEOLOGY-

CiteScore

1.40

自引率

12.50%

发文量

审稿时长

50 weeks

期刊介绍： The Boletín de la Sociedad Geológica Mexicana is a completely free-access electronic journal published semi-annually that publishes papers and technical notes with its main objective to contribute to an understanding of the geology of Mexico, of its neighbor areas, and of geologically similar areas anywhere on Earth’s crust. Geology has no boundaries so we may publish papers on any area of knowledge that is interesting to our readers. We also favor the publication of papers on relatively unfamiliar subjects and objectives in mainstream journals, e.g., papers devoted to new methodologies or their improvement, and areas of knowledge that in the past had relatively little attention paid them in Mexican journals, such as urban geology, water management, environmental geology, and ore deposits, among others. Mexico is a land of volcanos, earthquakes, vast resources in minerals and petroleum, and a shortage of water. Consequently, these topics should certainly be of major interest to our readers, our Society, and society in general. Furthermore, the Boletín has been published since 1904; that makes it one of the oldest scientific journals currently active in Mexico and, most notably, its entire contents, from the first issue on, are available online.