苏丹卡萨拉东部萨赫勒古环境全新世地貌与土壤沉积档案

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
S. Costanzo, A. Zerboni, A. Manzo
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引用次数: 0

摘要

过去几十年来,对北非考古关键地区过去气候、自然景观和环境的研究一直备受关注。对于其中一些地区来说,人类与环境的关系,作为人与自然之间的双向相互作用,一直是一个长期存在的研究问题;然而,对于其他领域来说,环境记录仍然是一个未经探索的档案。在这里,我们介绍了案例研究,讨论苏丹卡萨拉地区萨赫勒地带最东部的考古环境遗址。其中,在目前以花岗岩类岩石露头为特征的景观中,发现了包裹该地区气候历史的土壤沉积特征,花岗岩露头点缀着一片由旱生植物和薄短草占据的巨大砾石足平原。通过实地调查、理化实验室分析、微观形态分析和辐射测年,我们调查了第四纪记录的最上部,以了解全新世晚期的考古记录。已确定的主要特征包括较低平地中埋藏的等腐殖土层,这是全新世早期至中期形成的更潮湿的依赖水的草原环境的遗留物,以及后来在露头侵蚀山麓附近与崩坡砾石混合的增生性多尘风积沉积物,气候恶化的证据,干旱和侵蚀驱动的超季节性。研究结果具有重要意义,有助于更全面地了解该地区过去的人类经济,也有助于重建非洲表面过程的动态及其对全球气候变化的反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Holocene geomorphological and pedosedimentary archives of eastern Sahelian paleoenvironments (Kassala, Sudan)
Studies upon past climates, natural landscapes, and environments of archaeologically pivotal regions of northern Africa have been of paramount interest in the past decades. For some of those regions, the human-environmental nexus, intended as the biunivocal mutual agency between people and nature, has been a long-standing research question; yet, for other areas, the environmental record is a still unexplored archive. Here we present case studies discussing archaeo-environmental sites from the easternmost stretches of the Sahelian belt, in the Kassala region of Sudan. Therein, in a landscape that is currently characterized by granitoid rocky outcrops dotting a vast gravelly pediplain colonized by xerophytes and thin ephemeral grass, pedosedimentary features that encase the climatic history of the region are found. By means of field survey, physico-chemical laboratory analyses, micromorphological analyses, and radiometric dating, we investigated the uppermost portion of the Quaternary record to contextualize the Late-Holocene archaeological record. The main identified features include buried isohumic soil horizons in lower flat grounds, which are legacy of water-reliant prairie environments formed in the wetter Early to Middle Holocene, and later accretional dusty aeolian deposits intermingled with colluvial gravels close to the outcrops’ eroded foothills, testimony of a climatic deterioration towards aridity and erosion driven by hyper seasonality. Results are of great importance as a contribution to a more holistic understanding of past human economies of the region, as well as being a newly added tile to the reconstruction of surface processes dynamics over Africa and their response to global climate changes.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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