Ichnofabrics of Eocene oil shales from central Jordan and their use for paleoenvironmental reconstructions

Geoarabia Pub Date : 2014-01-01 DOI:10.2113/geoarabia190185
M. Hussein, Mohammad Alqudah, O. Podlaha, S. V. D. Boorn, S. Kolonic, Jörg Mutterlose
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引用次数: 23

Abstract

The study of trace fossils is widely used in facies interpretation. It provides a crucial tool for reconstructing depositional paleoenvironments when used in combination with other sedimentological and paleontological proxies. Here we present the first detailed study of Eocene trace fossils from Jordan. Two sections of Early to Middle Eocene age, with a total thickness of 478.7 m, from central Jordan were cored and investigated. The results of individually occurring (isolated) or co-occurring (combined) ichnofabrics and bioturbation levels, in combination with results from biostratigraphic and geochemical studies, were used for stratigraphic and paleoenvironmental reconstructions. The bioturbation index (BI) was used to classify the burrowing density versus the preservation of the original sedimentary structures. The two cores show highly variable grades of bioturbation with BI ranging from 0 to 6. Four ichnogenera were identified: Thalassinoides, Chondrites, Teichichnus and Zoophycos. Both the ichnofabrics and the variations of the BI suggest a shallow, highly dynamic depositional system with rapid changes of water depth and degree of bottom-water oxygenation.
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约旦中部始新世油页岩技术组构及其在古环境重建中的应用
微量化石的研究在相解释中有着广泛的应用。它与其他沉积学和古生物学指标相结合,为重建沉积古环境提供了重要的工具。在这里,我们提出了约旦始新世痕迹化石的第一个详细研究。对约旦中部早始新世至中始新世两段总厚度为478.7 m的岩心进行了研究。单独发生的(孤立的)或共同发生的(联合的)技术结构和生物扰动水平的结果,结合生物地层学和地球化学研究的结果,用于地层和古环境重建。利用生物扰动指数(BI)对挖掘密度与原始沉积结构的保存情况进行分类。两个岩心显示出高度可变的生物扰动等级,BI在0到6之间。鉴定出4个鱼属:Thalassinoides、Chondrites、Teichichnus和Zoophycos。无论是地层结构还是BI的变化,都表明该沉积体系是一个浅层、高度动态的沉积体系,其水深和底水氧合程度变化迅速。
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来源期刊
Geoarabia
Geoarabia 地学-地球科学综合
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>12 weeks
期刊介绍: Cessation. Published from 1996 to 2015, GeoArabia, The Journal of the Middle Eastern Geosciences was a quarterly journal covering the petroleum geosciences in the Middle East. The journal covers subjects such as: - sedimentology - tectonics - geophysics - petroleum reservoir characterization
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