Processi paleocarsici e geositi:il caso del “libeccio antico” nel distretto marmiferodi Custonaci, Sicilia nord-occidentale

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Abstract

AbstractThe Upper Triassic strata that crops out along the northern slope of Monte Sparagio, in the Custonaci “marble” district innorthwestern Sicily, show an extensive development of dissolution cavities with a very variable shape and dimensions.Several different types of dissolution morphologies can be differentiated from microkarst to giant caverns. The cavitiesare filled up by polychrome silts or calcite cements or, in the larger caverns, by collapse breccias. The matrix betweenthe collapse breccias is a polychrome silt that gives rise to an attractive ornamental stone, quarried in the past with thename of “Libeccio Antico”.The diagenetic processes that have controlled the formation of this complex dissolution network were sea-leveloscillations, either of low-amplitude and high-frequence, or major, tectonically enhanced, sea-level fall.The cut surfaces of several old quarries of an ornamental stone known as “Libeccio Antico” offer the possibility toobserve the high-diverse dissolution features and their relationships with the peritidal host carbonates.In particular some quarries in Contrada Cocuccio allow to observe at a glance either the fossiliferous host rock or themultiscale dissolution features and are worth to be preserved as a multiple geosite.
Lingua originaleItalian
Numero di pagine5
Stato di pubblicazionePublished - 2016

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