Quaternary paleosols and sediments on the Balearic Islands as indicators of climate changes
Quaternary paleosols and sediments on the Balearic Islands as indicators of climate changes
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巴利阿里群岛第四纪古土壤和沉积物作为气候变化的指标
DOI：
10.1016/j.catena.2013.06.022
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发表时间：
2014
期刊：
影响因子：
6.2
通讯作者：
Günster
中科院分区：
文献类型：
--
作者：
Wagner;Eckmeier;Skowronek;Günster
古土壤和沉积物是重建古气候的合适对象。为了获得西地中海地区较高的气候地层学分辨率，研究了马略卡岛两个冲积扇悬崖剖面的古土壤和沉积层地质档案，其土壤地层学覆盖了晚上新世、更新世和全新世。对这些位点进行了颜色、CaCO3、δ13C和δ18O同位素和微观形貌分析。El Toro（西南马略卡岛）的层序包括44个部分多成因的古土壤和沉积层，其中红色主要出现在上新世晚期和早更新世，但也有部分出现在更年轻的时期。Colonia de Sant Pere （NE Mallorca）的Eemian - w<s:1> rmian序列由黄红色的海滩砂沉积和细红色沉积物组成，而其上覆的全新世棕质黄土在温和的气候条件下经历了较短的干燥期，成土强度下降。除了铁风化和赤铁矿形成过程外，土壤变红还需要在明显交替的湿度条件下频繁的二次气候振荡的多生作用。因此，目前的地中海气候不足以使土壤变红。微形态研究强调了古土壤和沉积物的多成因发育，表明富碳酸盐沉积物与主要脱钙化、褐化和部分再钙化的古土壤交替存在。收缩膨胀裂缝反映了早更新世的季节性地中海气候条件。总的来说，晚上新世和早更新世的成土作用最为强烈，地中海相对湿润的条件增强了成土作用，但随后逐渐减弱。沉积物在相对干燥和部分凉爽的气候条件下发育，植被覆盖减少，甚至没有植被覆盖，增强了地表侵蚀。因此，巴利阿里群岛上的古土壤和沉积物反映了晚上新世以来西地中海地区明显的气候周期性。
Paleosols and sediments are suitable objects for reconstructing paleoclimate. To obtain a high climatostratigraphic resolution in the Western Mediterranean, we investigated geoarchives with paleosols and sediment layers in cliff profiles of two alluvial fans on Mallorca, their pedostratigraphy covered the Late Pliocene, Pleistocene and Holocene. The sites were analysed in terms of colour, CaCO3, δ13C and δ18O isotopes, and micromorphology.The sequence of El Toro (SW Mallorca) comprises 44 partly polygenetic paleosols and sediment layers, where redness is mostly pronounced in Late Pliocene and Early Pleistocene layers, but also partly in younger periods. The Eemian to Würmian sequence of Colonia de Sant Pere (NE Mallorca) consists of yellowish–red beach sand deposits and fine red sediments, while the overlying brunified Holocene soil on loess follows shorter dry periods under moderate climate conditions with a declined pedogenetic intensity. Apart from iron weathering and hematite formation processes, soil reddening also requires polygenesis with frequent secondary climatic oscillations under distinctly alternating moisture conditions. Consequently, the current Mediterranean climate alone is not sufficient for soil reddening.Polygenetic development of the respective paleosols and sediments was underlined by micromorphological studies, showing an alternation of carbonate-rich sediments with predominantly decalcified, brunified and partly recalcified paleosols. Shrink–swell cracks reflect seasonal Mediterranean climate conditions already during the Early Pleistocene.Altogether, pedogenesis was most intense during the Late Pliocene and Early Pleistocene as enhanced by comparatively humid Mediterranean conditions, but then gradually decelerated. The sediments developed under comparatively drier and partly cooler climate conditions with a reduced open or even absent vegetation cover enhancing surface erosion. Paleosols and sediments on the Balearic Islands thus reflect a pronounced climatic cyclicity in the Western Mediterranean since the Late Pliocene.
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影响因子：
2.7
作者：
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通讯作者：
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影响因子：
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DOI：
10.3285/eg.21.1.07
发表时间：
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期刊：
EG Quaternary Science Journal
影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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作者：
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