期刊
HISTORICAL BIOLOGY
卷 34, 期 10, 页码 2000-2019出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/08912963.2021.1996572
关键词
Alborz; Mobarak formation; ichnofabric; environmental control; Paleotethys margin
This study integrates ichnological and sedimentological data to interpret depositional environments in the carbonate sediments of the Mobarak Formation in northern Iran. Seven ichnofabrics have been identified, each revealing different energy phases and substrate conditions, controlled by subsidence-inducing changes in the accommodation space. The study highlights the sensitivity of ichnological features to paleoenvironmental conditions such as oxygen levels and hydrodynamic energy.
This study integrates ichnological and sedimentological data to interpret depositional environments in the carbonate sediments of the Mobarak Fm. (Lower Carboniferous) in the Alborz Mountains of northern Iran. Seven ichnofabrics including Thalassinoides (Th), Zoophycos-Phycosiphon (Zo-Ph), Skolithos-Thalassinoides (Sk-Th), Zoophycos-Diplocraterion (Zo-Di), Thalassinoides-Rhizocorallium (Th-Rh), Zoophycos-Arenicolites (Zo-Ar) and Chondrites-Phycosiphon (Ch-Ph) have been identified in the studied succession. Th ichnofabric is characterised by the dominance of the deposit-feeding trace fossils, revealing low sedimentation rate and activity of the organisms in a loose substrate. Vertical succession of the Zo-Ph, Sk-Th and Zo-Di ichnofabrics indicates change in the firmness of the substrate. Th-Rh and Zo-Ar ichnofabrics reveal two different energy phases including a lower energy condition with the activity of deposit-feeders and a higher energy phase identified by the activity of suspension-feeders. Ch-Ph ichnofabric is characterised by low diversity and low abundance of trace fossils that were identified in black, limy shale, displaying a long lasting outer ramp setting with low energy, low sedimentation rate, and dysoxic-anoxic conditions of the substrate. Ichnological features of the Mobarak Fm. are controlled by subsidence-inducing changes in the accommodation space of the depositional system dictating variations in paleoenvironmental conditions such as oxygen levels and hydrodynamic energy.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据