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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Volcanic Soil Formation In Calabria (southern Italy): The Cecita Lake Geosol In The Late Quaternary Geomorphological Evolution Of The Sila Uplands
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Volcanic Soil Formation In Calabria (southern Italy): The Cecita Lake Geosol In The Late Quaternary Geomorphological Evolution Of The Sila Uplands

机译：卡拉布里亚（意大利南部）的火山土壤形成：西拉山地第四纪晚期地貌演化中的塞奇塔湖地溶胶

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This paper focuses on the main morphological, physical, chemical and mineralogical features of an andic-like soil, widely outcropping in the Sila upland plateau of Calabria (southern Italy), and its potential role in tephrostratigraphy. A multidisciplinary and multiscale approach allowed identification of this soil as a "masked" distal archive of volcanic products, developed on granite rocks and sediments with a coeval pyroclastic input during pedogenesis. The study demonstrates that the contribution of volcanic parent materials can be successfully hypothesized and assessed even in the absence, limited extent or poor preservation of primary eruptive products. The soil has an Andisol-like appearance, despite laboratory data that do not match the entire suite of diagnostic criteria for the Andisol taxonomic order. Geomorphological, stratigraphic and pedologic results, coupled with tephrostratigraphic and radiometric data, concur to suggest a Late Pleistocene(?) to Holocene age of the Andisol-like soil. In particular, the rhyolitic chemical composition of small-sized glass fragments (identified by SEM-EDS analyses) indicates soil genesis contributed by volcanic ash, probably sourced from Aeolian Arc explosive activity spanning the last 30 ka. Accordingly, the evidence of limited relict clay illuviation and the specific type of pedogenesis allowing the development of andic properties (in turn related to the neoformation of clay minerals from the weathering of volcanic glass) are consistent with a climatic shift from a seasonally-contrasted to a constantly humid pedoenvironment This change can be ascribed to the Lateglacial(?) or Early-Middle Holocene to Late Holocene transition. Calibrated AMS ~(14)C dates performed on charcoal fragments sampled from three representative soil profiles, provide Late Holocene ages (3136 ± 19, 343+16 and 92 ± 24 yr BP), in accord with archaeological finds. On the basis of the consistent stratigraphic position, lateral continuity and wide extent the soil can be considered a good pedostratigraphic marker in the Sila highlands and is informally defined as the "Cecita Lake geosol". It supplies valuable time constraints for the underlying (occasionally overlying) deposits and/or soils. Moreover, it allows regional-scale morphostratigraphic correlations and detailed reconstruction of Late Pleistocene-Holocene geomorphic events in Calabria, a very suitable region for distal tephra deposition in the central Mediterranean peri-volcanic area. The effects of high-energy volcanic eruptions are interfingered with or superimposed by other geomorphic processes and climatic or anthropogenic signals.
机译：本文着重研究在卡拉布里亚（意大利南部）的西拉高地高原广泛露头的似安迪奇状土壤的主要形态，物理，化学和矿物学特征，及其在断层地层学中的潜在作用。一种多学科，多尺度的方法可以将这种土壤鉴定为火山产品的“隐蔽”远期档案，在成岩作用期间在花岗岩岩石和沉积物上形成，并伴有同期的火山碎屑作用。这项研究表明，即使在没有初级火山爆发产物，程度有限或保存不良的情况下，也可以成功地假设和评估火山母体物质的贡献。尽管实验室数据与Andisol分类标准的整套诊断标准不符，但土壤仍具有Andisol样的外观。地貌，地层学和岩石学的结果，再加上地层，地层学和放射学数据，都表明安第索尔样土壤的晚更新世（？）至全新世时代。特别是，小尺寸玻璃碎片的流变化学成分（通过SEM-EDS分析确定）表明，土壤成因是由火山灰贡献的，可能来自过去30 ka的风弧爆发活动。因此，有限的遗迹粘土激发作用和成岩作用的特定类型的证据，可以开发出安迪奇特性（进而与火山玻璃风化引起的粘土矿物的新形成有关），与气候从季节性变化到持续潮湿的土壤环境这种变化可归因于晚新世（？）或中新世早期到新世晚期。对从三个代表性土壤剖面采样的木炭碎片进行校准的AMS〜（14）C日期，根据考古发现提供了晚全新世年龄（3136±19、343 + 16和92±24年BP）。在一致的地层位置，横向连续性和广泛范围的基础上，土壤可被视为西拉高地的良好地层学标记，并被非正式地定义为“ Cecita Lake geosol”。它为潜在的（有时是上覆的）沉积物和/或土壤提供了宝贵的时间限制。此外，它还允许区域尺度的地层学相关性以及卡拉布里亚晚更新世-全新世地貌事件的详细重建，卡拉布里亚是地中海中部火山区远端特发拉沉积的一个非常合适的区域。高能火山喷发的影响与其他地貌过程和气候或人为信号相互干扰或叠加。

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