埃及沙漠东北部上白垩世大型动物古群落及微相分析

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Saeed FAREED, Yasser SALAMA, Abdelaziz MAHMOUD
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引用次数: 0

摘要

埃及东北部沙漠Galala高原南部Wadi Umm-Khayshar的上白垩统序列由高度多样化的动物群组成,从底部到顶部可划分为Galala(中晚期Cenomanian)、Maghra El Hadida(晚期Cenomanian -晚Turonian)、Matulla (coniian - santonian)和Sudr (Campanian-Maastrichtian)组。研究剖面记录了5个鹦鹉螺生物带:Neolobites vibrayeanus、Vascoceras cauvini(晚Cenomanian)、Vascoceras proprium、Choffaticeras segne和Coilopoceras requienianum (Turonian)。在详细研究和微相分析的基础上,解释了上白垩统演替的古环境,反映了从潮间带到深潮下的同斜斜坡台地沉积。通过对大型动物组合和沉积相的详细研究,对研究剖面的古生态学进行了解释。对1029个大型底栖动物标本进行定量分析(q模式聚类分析,使用Raup-Crick配对类群方法),包括45种软体动物和棘类动物,得到了5个大型动物群落(A-E),这些群落被描述和解释为群落的残余。20种235个头足类标本代表了神经元素;热图聚类分析显示了这些标本在上塞诺曼—turonian阶段的分布。环境参数(基质浓度、沉积速率、水能、地表水生产力和氧气有效性)控制了所研究的大型动物的分布。这5个群落可分为低胁迫群落(A、B、C和D)和高胁迫群落(E)两大类。低胁迫群落来自两种不同的生境:(1)高能量、坚固的底栖,以趾上双壳类动物、大型趾上腹足类动物和常规棘足类动物为主;(2)以水生双壳类和棘皮类为主的低能软底生境。高应激关联仅由两个物种主导,记录于回归阶段的高能量浅滩环境。对Wadi Umm-Khayshar剖面大型底栖动物和头足类动物的详细研究,对该剖面的Cenomanian-Turonian演替提供了良好的古生态学认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Macrofaunal Paleocommunities and Microfacies Analysis from the Upper Cretaceous in North Eastern Desert of Egypt

The Upper Cretaceous successions of Wadi Umm-Khayshar, southern Galala Plateau, North Eastern Desert, Egypt, are composed of highly diversified faunas and subdivided from base to top into the Galala (Middle–Late Cenomanian), Maghra El Hadida (Latest Cenomanian–Late Turonian), Matulla (Coniacian–Santonian), and Sudr (Campanian–Maastrichtian) formations. Five ammonite biozones are recorded in the studied section: Neolobites vibrayeanus, Vascoceras cauvini (late Cenomanian), Vascoceras proprium, Choffaticeras segne, and Coilopoceras requienianum (Turonian) zones. The paleoenvironments of the Upper Cretaceous succession are interpreted based on detailed study and microfacies analysis that reflect a deposition in a homoclinal ramp platform ranging from intertidal to deep subtidal. The paleoecology of the Cenomanian–Turonian succession in the studied section is explained based on a detailed study of macrofaunal associations and sedimentary facies. Quantitative analysis (Q-mode cluster analysis, using the Raup–Crick Paired group method) of 1029 macrobenthic specimens, including 45 species of mollusks and echinoids yielded five macrofaunal associations (A–E) that are described and interpreted as remnants of communities. The nektonic elements are represented by 235 cephalopod specimens of 20 species; heatmap cluster analyses show the distribution of these specimens during the Upper Cenomanian–Turonian stages. Environmental parameters (substrate consistency, rate of sedimentation, water energy, surface-water productivity, and oxygen availability) controlled the distribution of the studied macrofauna. The five associations are divided into two major groups: low-stress associations (A, B, C, and D), and a high-stress association (E). The low stress associations are recorded from two different habitats: (1) a high-energy, firm substrate habitat, dominated by epifaunal bivalves, large epifaunal gastropods and a regular echinoid; (2) a low-energy, soft substrate habitat dominated by infaunal bivalves and echinoids. The high stress association is dominated by only two species and recorded from a high-energy shoal environment during a regression phase. A detailed study of macrobenthos and cephalopods provides a good paleoecological understanding of Cenomanian–Turonian succession in the Wadi Umm–Khayshar section.

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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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