Maastrichtian-early Eocene Planktic Foraminiferal Biostratigraphy of the successions in the southeastern Izeh Zone (Zagros Basin, SW Iran)

IF 1.1 4区 地球科学 Q3 GEOLOGY
Masoumeh Sabokro, Mohammad Vahidinia, Mohammad Hossein Adabi, Nasrin Hadavandkhani
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Abstract

The sedimentary sequence, extending from the Maastrichtian to the lower Eocene and exposed in two sections in the easternmost part of the Izeh Zone (Kuh-e-Sefid and Mish anticlines) in the Zagros Basin, has been subjected to a comprehensive analysis of its Planktic foraminiferal assemblage. This time interval encompasses the upper part of the Gurpi Formation and the lower to middle part of the Pabdeh Formation, spanning from the base to the top. The lithology of the Maastrichtian-early Eocene successions comprises calcareous shales, argillaceous limestones, glauconitic and phosphatic limestones, marlstones, purple shales, and cherty argillaceous limestones. A total of 35 genera and 118 species of Planktic foraminifera have been conclusively identified. The identified biozones include the Contusotruncana contusa Interval Zone and the Abathomphalus mayaroensis Interval Zone, indicating an early to late Maastrichtian age for the upper part of the Gurpi Formation. The lower to middle part of the Pabdeh Formation exhibits distinctive biozones, such as Praemurica uncinata (P2), Igorina albeari (subzone P3b), Igorina-Globanomalina pseudomenardii Interval Zone, Globanomalina pseudomenardii (P4), Morozovella velascoensis (P5), Acarinina sibaiyaensis (E1), Globanomalina pseudomenardii-Pseudohastigerina wilcoxensis Interval Zone, Pseudohastigerina wilcoxensis/Morozovella velascoensis (E2), Morozovella marginodentata (E3), Morozovella velascoensis-Morozovella formosa formosa and/or Morozovella lensiformis Interval Zone (subzone P6a), Morozovella formosa (E4), Morozovella aragonensis/Morozovella subbotinae (E5), Acarinina pentacamerata (E6), Acarinina cuneicamerata (subzone E7a), and Turborotalia frontosa (subzone E7b). The boundary between the Pabdeh and Gurpi Formations in the examined sections is demarcated by an unconformity, characterized by a sedimentary hiatus from the early Danian to the early Selandian within biozones P0 to P3a.

Abstract Image

伊泽区东南部(伊朗西南部扎格罗斯盆地)马斯特里赫世-始新世早期沉积有孔虫生物地层学
我们对扎格罗斯盆地伊泽区(Kuh-e-Sefid 和 Mish 反褶)最东端两个断面的沉积序列进行了浮游有孔虫类群的全面分析,该沉积序列从马斯特里赫特期一直延续到下始新世。该时间区间包括 Gurpi 地层的上部和 Pabdeh 地层的中下部,从底部一直延伸到顶部。马斯特里赫特-始新世早期的岩性包括钙质页岩、霰粒灰岩、釉质灰岩和磷质灰岩、泥灰岩、紫色页岩和樱桃质霰粒灰岩。已确定的浮游有孔虫共有 35 属 118 种。已确定的生物区包括 Contusotruncana contusa 间隔区和 Abathomphalus mayaroensis 间隔区,表明古尔皮地层上部的年代为早至晚马斯特里赫特期。Pabdeh 地层的中下部显示出独特的生物区,如 Praemurica uncinata(P2)、Igorina albeari(P3b 亚区)、Igorina-Globanomalina pseudomenardii 区带、Globanomalina pseudomenardii(P4)、Morozovella velascoensis(P5)、Acarinina sibaiyaensis(E1)、Globanomalina pseudomenardi-Pseudohastigerina wilcoxensis 间隔区、Pseudohastigerina wilcoxensis/Morozovella velascoensis(E2)、Morozovella marginodentata(E3)、Morozovella velascoensis-Morozovella formosa formosa 和/或 Morozovella lensiformis 间隔区(P6a 亚区)、Morozovella formosa(E4)、Morozovella aragonensis/Morozovella subbotinae(E5)、Acarinina pentacamerata(E6)、Acarinina cuneicamerata(E7a 亚区)和 Turborotalia frontosa(E7b 亚区)。在所考察的地段中,Pabdeh 地层与 Gurpi 地层之间的边界以不整合为界,其特点是在 P0 至 P3a 生物区内出现了从早旦纪到早塞兰纪的沉积间断。
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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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