Horizontes de fragipan de tipo «ison» formados por permafrost en la Sierra de Guadarrama
DOI:
https://doi.org/10.3989/egeol.88441-2526Keywords:
fragipan, ison, periglacial, permafrostAbstract
A toposecuence of soiIs that incIudes soils with fragipan of ison sort (FitzPatrick, 1974) is studied in the Sierra de Guadarrama. The presence of these soils in the high part of the mountain confirms the permafrost formation in the last glaciation. On the other band, the analitical data and tbe field observations of soils allow us to stablish, hypoteticaIIy, three stages in their evolution: 1) prewürm weathering and pedogenesis; 2) compaction and densification of the soils mass in the area affected by the permafrost; 3) truncation, fosilization and pedogenesis phenomena in the Holocene. About the climate the mean annual temperature in the last cold period must have been between 7,5 ºC and 12,5 ºC lower than now.
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