The expression of the MIS 12 glacial stage in Southeastern Europe and its impact over the Middle Pleistocene hominins in Megalopolis Basin (Greece)

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
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Abstract

Southern Europe is hypothesized to have acted as a glacial refugium for hominin populations during the Pleistocene. Of particular importance is South-East Europe, which most likely played a dual role, both as refugium and dispersal corridor, especially during the Middle Pleistocene glaciations, when drastic climatic conditions led to major sea level drops in the Aegean. However, little is known about the palaeoenvironmental conditions at the time of hominin presence in this region, making these hypotheses difficult to test. Here we analyze biomarker data and leaf wax stable isotopic compositions of the MIS 12 Lower Palaeolithic site Marathousa 1 (Megalopolis Basin, Greece) to assess the climatic conditions accompanying the time of hominin presence in the area. Our data indicate a major cooling affecting the north Mediterranean/Aegean domain during this time interval, with lowest temperatures recorded between ∼440–432 ka. The glacial peak is associated with changes in vegetation (i.e., from more forested to more open landscape), reduction of humidity and water availability (i.e., moisture depletion, increased evaporation). Hominins are present at the Marathousa 1 location at the end of this interval (434–432 ka), confirming that the Megalopolis Basin served as a refugium for hunter-gatherer groups during periods of harsh climatic conditions. Additionally, the progressive cooling is associated with an important sedimentary hiatus between ∼465–440 ka reflected in all circum-Mediterranean records (both marine and continental), indicating a regional impact of the MIS 12 glaciation over surface processes.

东南欧 MIS 12 冰期的表现及其对希腊 Megalopolis 盆地中更新世人类的影响
南欧被假定为更新世期间类人种群的冰川避难所。特别重要的是东南欧,它很可能扮演了双重角色,既是避难所,又是扩散走廊,尤其是在中更新世冰川时期,当时剧烈的气候条件导致爱琴海海平面大幅下降。然而,人们对该地区出现人类时的古环境条件知之甚少,因此这些假设很难得到验证。在这里,我们分析了MIS 12下旧石器时代遗址Marathousa 1(希腊梅加洛波利斯盆地)的生物标志物数据和叶蜡稳定同位素组成,以评估该地区出现人类时的气候条件。我们的数据表明,在这一时期,北地中海/爱琴海地区出现了大降温,最低气温记录在 440-432 ka 之间。冰川高峰期与植被变化(即从更多的森林景观到更开阔的景观)、湿度降低和水供应减少(即水分耗竭、蒸发增加)有关。在这一时期的末期(434-432 ka),马拉图萨 1 号地点出现了类人猿,这证明在气候条件恶劣的时期,大城盆地是狩猎采集群体的避难所。此外,逐渐变冷与所有环地中海记录(海洋和大陆记录)中反映的 465-440 ka 之间的重要沉积间断有关,表明 MIS 12 冰川作用对地表过程产生了区域性影响。
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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