Microbiostratigraphy, microfacies analysis and lateral basin evolution of Lower Cretaceous deposits in the south of Kerman region, SE Iran

IF 0.5 4区地球科学 Q4 GEOLOGY

Boletin De La Sociedad Geologica Mexicana Pub Date : 2022-07-30 DOI:10.18268/bsgm2022v74n2a240322

M. Hassani

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Abstract

Detailed microbiostratigraphy and basin evolution of the Lower Cretaceous deposits in the Rayen area, south of Kerman Region, SE Iran are investigated for the first time in two sections. The section no. 1 is 324.6m in thickness and comprises five lithostratigraphic units. The section no. 2 is 218 m in thickness and includes three lithostratigraphic units. The identified fauna and flora include 41 benthic foraminifera and 11 calcareous algae species. The identified assemblage indicates that the marine strata in both sections were deposited during the Barremian to Albian. The microfacies analyses carried out on 22 carbonate and 2 clastic microfacies indicate that the deposits in the section no. 1 were deposited on a homoclinal carbonate ramp, whereas in the section no. 2 they were deposited on a rimmed carbonate shelf. Generally, the Cretaceous deposit in the two studied sections represent different sedimentary models and fossil content indicating different basin evolution histories. The paleogeographic setting of the studied area on the south eastern margin of the Central-East Iranian Microcontinent and the active tectonic history during the Mesozoic suggest that the syndepositional tectonism influenced the basement’s morphology and resulted in changes in the fossil diversity and sedimentary nature of adjacent sedimentary basins.

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伊朗东南部Kerman地区南部下白垩统沉积微生物地层学、微相分析及盆地侧向演化

首次对伊朗东南部Kerman地区南部Rayen地区下白垩统沉积进行了详细的微生物地层学和盆地演化研究。节号。1层厚度为324.6m，由5个岩性地层单元组成。节号。2层厚度218 m，包括3个岩性地层单元。已查明的动植物区系包括41种底栖有孔虫和11种钙质藻类。经鉴定的组合表明，这两个剖面的海相地层均沉积于巴雷米期至阿尔比良期。对22个碳酸盐岩微相和2个碎屑岩微相进行了微相分析。第1段沉积于同斜碳酸盐斜坡上，第2段沉积于同斜碳酸盐斜坡上。它们沉积在一个边缘碳酸盐陆架上。总的来说，两个研究剖面的白垩系沉积代表了不同的沉积模式和化石含量，表明了不同的盆地演化历史。研究区位于伊朗中东部微大陆东南缘的古地理背景和中生代活跃的构造历史表明，同沉积构造作用影响了基底的形态，导致了邻近沉积盆地化石多样性和沉积性质的变化。

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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.