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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Impact of the late Cenomanian sea-level rise on the south Tethyan coastal ecosystem in the Middle East (Jordan, Egypt, and Tunisia): A quantitative eco-biostratigraphy approach
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Impact of the late Cenomanian sea-level rise on the south Tethyan coastal ecosystem in the Middle East (Jordan, Egypt, and Tunisia): A quantitative eco-biostratigraphy approach

机译：临曼沿海海平面上游南特索山沿海生态系统的影响（约旦，埃及和突尼斯）：一种定量的生态生物学方法

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摘要

Sea-level rise can cause changes in coastal ecosystems. To understand the link between sea-level rise and the coastal ecosystems during the late Cenomanian of the southern Tethys, five exposed sections from three Middle East countries were quantitatively analyzed. The Unitary Association (UA) method allowed a two-fold increase in the resolution of zones compared to the Oppel method. Five UAs were obtained from analyses of both ammonite and benthic fauna. However, they were grouped into 3 UA Zones (UAZ) to enable basin-wide correlation. These zones were linked to one and half 3rd-order depositional cycles. During the Neolobites vibrayeanus/ Calycoceras guerangeri ammonite zone (95.5-94.4 Ma), high-energy shallow subtidal environments were formed by the transgression that followed the global sequence boundary 'KCe 4'. They were dominated by stationary epifauna and suspension-feeders (mainly oyster bivalves). During highstand, a restricted lagoonal environment prevailed, where oyster bivalves, which have well-known adaptive strategies, were still dominant. No ammonites were recorded in this zone. Upward, the fauna has underwent a major shift, which documents the beginning of a new depositional sequence above a regional sequence boundary 'KCe 5' with a gradual increase of hemipelagic organic-rich sediments and planktic/nektic fauna in addition to infaunal deposit-feeders and mobile benthos, which have lived in a deeper subtidal environment (Vascoceras cauvini/Pseudospidoceras pseudonodosides ammonite zone; 94.4-93.8 Ma). This dramatic change in the character of the macrofauna at the Cenomanian/ Turonian boundary (maximum flooding of KCe 5) can be attributed to the hydrodynamic changes associated with the eustatic sea-level rise. Therefore, the sea-level-based faunal changes can be integrated in sequence stratigraphic analyses. The geographic reproducibility of the UA mirrors the delay of the transgressive onlap in proximal sections, and thus, can be used to define transgressive and maximum flooding surfaces. This ecobiostratigraphic scheme can be implemented in reliable large-scale correlations.
机译：海平面上升会引起沿海生态系统的变化。为了了解特提斯南部赛诺曼晚期海平面上升与海岸生态系统之间的联系，对三个中东国家的五个暴露剖面进行了定量分析。与Oppel方法相比，单一联合（UA）方法使分区分辨率提高了两倍。通过对菊石和底栖动物群的分析，获得了五个UAs。然而，它们被分为3个UA区（UAZ），以实现盆地范围内的对比。这些带与一个半三级沉积旋回有关。在vibrayeanus/Calycoceras-guerangeri菊石带（95.5-94.4 Ma）中，全球层序边界“KCe 4”之后的海侵形成了高能浅潮下环境。它们主要由固定的表面动物群和悬浮饲养者（主要是牡蛎双壳类）组成。在高位期间，受限的泻湖环境占主导地位，牡蛎双壳类仍然占主导地位，它们具有众所周知的适应策略。该区域未记录到菊石。向上，动物群经历了一次重大转变，记录了区域层序边界“KCe 5”上方新沉积层序的开始，除了底栖沉积物馈线和移动底栖动物外，半深海富含有机物沉积物和浮游/浮游动物群逐渐增加，它们生活在更深的潮下环境中（Vascocera cauvini/Pseudospidoceras pseudonodosides ammonite带；94.4-93.8 Ma）。塞诺曼阶/土伦阶边界大型动物群特征的这种显著变化（KCe 5的最大洪水量）可归因于与海平面升降相关的水动力变化。因此，基于海平面的动物群变化可以整合到层序地层分析中。UA的地理再现性反映了近段海侵超覆的延迟，因此可用于定义海侵面和最大洪水面。这种生态-生物地层方案可以在可靠的大规模对比中实施。

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