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首页> 外文期刊>Facies >Carnian (Triassic) aridization on the Levant margin: Evidence from the M1 member, Mohilla Formation, Makhtesh Ramon, south Israel
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Carnian (Triassic) aridization on the Levant margin: Evidence from the M1 member, Mohilla Formation, Makhtesh Ramon, south Israel

机译：黎凡特边缘的Carnian（三叠纪）干旱化：来自M1成员，以色列南部Makhtesh Ramon Mohilla组的证据

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摘要

The Carnian Pluvial Event was followed by extreme aridity around the Mediterranean region, but the relationship between these climatic modes and the evaporite deposits of the north Arabian margin has not been established. The Mohilla Formation in Israel was deposited on the rifted Levant margin of the Neotethyan seaway during the Carnian (Late Triassic). The lowermost member, M1 (carbonate, shale, minor evaporite), records sea-level and climate change of the transition from open-marine deposits to the thick evaporite of the overlying M2 member. Field, petrographic and cathodoluminescence investigation of the M1 member exposed at Makhtesh Ramon, southern Israel, enabled tracking of changing paleoenvironments. The M1 member can be subdivided into six sea-level controlled sedimentary cycles, each terminating in subaerial exposure. Open-marine, lagoonal, and supratidal belts are represented, but environments become increasingly restricted upwards. Three of the exposure horizons are marked by well-developed early diagenetic features, including dissolution porosity and meteoric cements. These changing facies belts and the superposed diagenetic modes formed under an oscillating climate regime of three relatively humid episodes dominated by deposition of carbonate, alternating with evaporitic sediments indicating aridity. Deposition of the M1 member can be correlated with the transition in the western Tethys from the Carnian pluvial episode to aridity. This transition in the Levant region is characterized by an oscillatory climate that culminated in a thick evaporite unit from the extreme arid phase. The oscillations may be attributed to shifting global climate belts, overprinted by monsoonal strengthening and weakening, in the equatorial belt.
机译：卡尼纪雨水事件之后是地中海地区周围的极端干旱，但尚未确定这些气候模式与阿拉伯北部边缘蒸发岩沉积之间的关系。以色列的Mohilla组沉积于Carnian（晚期三叠纪）时期新裂谷海道裂陷的黎凡特边缘。最下部的成员M1（碳酸盐，页岩，少量蒸发岩）记录了海平面和气候变化，该变化是从上层海洋沉积物到上覆M2成员的浓厚蒸发岩的转变。对暴露于以色列南部Makhtesh Ramon的M1成员进行的野外，岩相和阴极发光研究使人们能够跟踪变化的古环境。 M1成员可细分为六个海平面控制的沉积循环，每个循环都终止于地下暴露。代表了海洋带，泻湖带和滨上带，但环境变得越来越受限制。三个接触层的特征是发育良好的早期成岩特征，包括溶蚀孔隙度和陨石胶结物。这些变化的相带和成岩成岩模式是在三个相对湿润的振荡气候下形成的，主要由碳酸盐的沉积和蒸发的沉积物交替组成，这表明干旱。 M1成员的沉积可能与特提斯西部从Carnian雨季到干旱的转变有关。黎凡特地区的这一转变的特点是振荡气候，最终导致极端干旱相形成了厚厚的蒸发岩单元。振荡可能归因于全球气候带的变化，赤道带的季风性增强和减弱盖过了印记。

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