回归波浪主导海岸线转变为潮汐主导河口的相结构和古地理演化:沙特阿拉伯Jauf组早泥盆世Subbat段

IF 2 4区 地球科学 Q1 GEOLOGY
H. Algheryafi, C. Viseras, Camilo A. Polo, K. Al-Ramadan
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引用次数: 1

摘要

阿拉伯板块北部的古生代序列是在多次海退和海侵事件中沉积的。Jauf组早泥盆世Subbat段包括古生代序列的几个较小规模的层段,这些层段是根据露头和地下数据的大规模观测进行解释的。本研究利用基于过程的沉积学,研究相堆叠、砂体的横向连续性和遗迹相,以解释一个开放的海浪主导的强迫回归系统,随后是海侵海岸线。本研究综合了四个露头和两个浅层岩芯中总共417米的泥盆纪地层。该数据集记录了一个三阶层序,该层序是在Subbat段沉积期间,通过两个碳酸盐单元之间的大量板内硅化碎屑流入而形成的。本研究说明了以滨面砂体和下苏巴特段侵蚀性三角洲前缘为特征的下降阶段系统域的演化。这些沉积物覆盖在海蚀退积面(RSME)上,延伸数百公里,并在Subbat段上部过渡为整体海侵。本研究共解释了七个相组合(FA):i)近海,ii)波浪主导的三角洲,iii)海岸面到近海的过渡,iv)河道,v)决口扇,vi)古土壤,以及vii)河口相组合。在Subbat段的下部,波浪主导的三角洲和海岸面至近海过渡FA覆盖在近海FA的海洋陆架地层上,并形成RSME。对冲积河道和决口扇FA进行了解释。就强度和多样性而言,从Nereites Ichnophase到Skolithos Ichnopphase,痕迹化石的独特组合在理解整体水深和沉积环境方面发挥着重要作用。独特的陆生原岩化石存在于片状体中,被解释为在主要河流洪水事件中形成的广泛决口扇的一部分。本研究利用遗迹学、沉积学和层序地层学提供了一种独特的综合方法,以更好地了解强迫回归层序的时空相分布,并完善早泥盆世时期阿拉伯北部的古地理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Facies architecture and paleogeography evolution of regressive wave-dominated shorelines transitioning into tide-dominated estuaries: Early Devonian Subbat Member, Jauf Formation, Saudi Arabia
The Paleozoic succession on the northern Arabian Plate was deposited during several regressive and transgressive events. The Early Devonian Subbat Member of the Jauf Formation comprises several smaller-scale intervals of the Paleozoic succession that were interpreted based on large-scale observations from outcrop and subsurface data. This study utilizes process-based sedimentology and investigates facies stacking, lateral continuity of sand bodies, and ichnofacies to interpret an open marine wave-dominated forced regressive system, that is followed by transgressive shorelines. This study integrates a total of 417 meters of the Devonian stratigraphy from four outcrops and two shallow cores. This dataset records a third-order sequence which developed through an extensive intra-plate siliciclastic influx in between two carbonate units during the deposition of the Subbat Member. This study illustrates the evolution of a falling-stage systems tract that is characterized by shoreface sand bodies and an erosional-based delta front in the lower Subbat Member. These sediments overlie a regressive surface of marine erosion (RSME), extending for hundreds of kilometers and transitioning to an overall transgression in the upper parts of the Subbat Member. This study interprets a total of seven facies associations (FAs): i) offshore, ii) wave-dominated delta, iii) shoreface to offshore transition, iv) fluvial channels, v) crevasse splays, vi) paleosol, and vii) estuarine facies associations. In the lower part of the Subbat Member, the wave-dominated delta and shoreface to offshore transitional FAs overlie the marine shelf strata of the offshore FA and develop a RSME. Fluvial channels and crevasse splays FAs are interpreted. Unique assemblages of trace fossils, in terms of intensity and diversity, ranging from the Nereites Ichnofacies to Skolithos Ichnofacies, play a major role in the understanding of the overall water depth and depositional setting. Distinctive terrestrial Prototaxites fossils are present in sheet-like bodies and are interpreted as part of extensive crevasse splays that formed during major river flooding events. This study provides a unique integrated approach using ichnology, sedimentology, and sequence stratigraphy to better understand the spatial and temporal facies distribution of a forced regressive sequence and refine the paleogeography of northern Arabia during Early Devonian time.
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来源期刊
CiteScore
3.80
自引率
5.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is broad and international in scope and welcomes contributions that further the fundamental understanding of sedimentary processes, the origin of sedimentary deposits, the workings of sedimentary systems, and the records of earth history contained within sedimentary rocks.
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