Reconstructing mid-holocene palaeoenvironmental dynamic in the middle atlas (Morocco) inferred from non‑marine molluscs succession of the Aït said ou Idder tufa sequence

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Quentin Wackenheim, N. Limondin‑Lozouet, L. Boudad, J. Berger
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引用次数: 3

Abstract

The Mediterranean area is particularly sensitive to environmental changes. In Morocco, research undertaken over the past ten years has shown that continental sedimentary archives are useful to document Holocene environmental and climatic variability. However, palaeoenvironmental reconstruction using non-marine molluscs is in an early stage of research. This paper aims to present a new chronostratigraphical and malacological analysis from a Middle-Holocene and Upper Pleistocene tufa sequence in the Middle Atlas (Ait-Said-ou-Idder). Results highlight that the lower part of the sequence is dated from the Upper Pleistocene which corresponds to a fluvio-paludal model of deposition. Radiocarbon dates assign the upper part of the sequence to the Middle Holocene. During the Pleistocene phase, the environment is a reed swamp that turns to permanent body water. During the Middle Holocene, three main environmental phases have been identified. Between 6600 and 6100 cal BP, a mesophilic environment is characterised by open and dry areas with some paludal zone. Between 6100 and 5600 cal BP, a durable marshland developed. Between 5600 and 4600 cal BP, the paludal zone tended to disappear while an open and sclerophyllous environment developed. The malacological study provides important elements to the construction of a Holocene malacological framework in Morocco initiated at Blirh (Upper Moulouya). Both records identify a drastic switch to environmental aridification at the end of the Middle Holocene. By recording at the same time local evolution and regional trends and events, Ait Said ou Idder results provide material to understand environmental variability in north-eastern Morocco.
重建中部地图集(摩洛哥)中全新世中期的古环境动态,该地图集是根据Aït said-ou-Idder tufa序列的非海洋软体动物序列推断的
地中海地区对环境变化特别敏感。在摩洛哥,过去十年的研究表明,大陆沉积档案有助于记录全新世的环境和气候变化。然而,利用非海洋软体动物重建古环境的研究尚处于早期阶段。本文旨在对中阿特拉斯(Ait-Said-ou-Idder)中中新统和上更新世凝灰岩序列进行新的年代地层和软化学分析。结果表明,该序列的下部年代为上更新世,对应于河流-沼泽沉积模式。放射性碳年代将该序列的上部归属于全新世中期。在更新世时期,环境是一片芦苇沼泽,变成了永久性的水体。在全新世中期,已经确定了三个主要的环境阶段。在6600至6100卡BP之间,中温环境的特点是开阔干燥的地区,有一些沼泽地带。在6100至5600卡BP之间,开发出了一片耐用的沼泽地。在5600至4600卡BP之间,沼泽地带趋于消失,同时形成了开放的硬叶环境。软化学研究为在布利尔(上穆卢亚)开始的摩洛哥全新世软化学框架的构建提供了重要元素。这两项记录都表明,在全新世中期结束时,环境干旱化发生了剧烈转变。Ait Said ou Idder的研究结果同时记录了当地的演变以及区域趋势和事件,为了解摩洛哥东北部的环境变化提供了材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Quaternaire
Quaternaire 地学-地球科学综合
CiteScore
1.70
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: La revue Quaternaire créée dès 1964 par l"AFEQ sous le nom de Bulletin de l"AFEQ est devenue Quaternaire en 1990. Ce journal scientifique paraît au rythme de quatre numéros par an. La revue publie des numéros d"auteurs (par ordre d"arrivée des manuscrits après acceptation) ou des numéros thématiques sur proposition ou invitation par le comité de rédaction. Les articles (en langue française, anglaise ou allemande) traitant de tous les aspects du Quaternaire sont acceptés. La revue est publiée avec le concours du Centre National de la Recherche Scientifique.
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