Diagenetic sequences and porosity in the arkosic and lithic Verrucano Lombardo and Val Gardena sandstones in N Italy are controlled dominantly by framework mineralogy and tectonic history. These stratigraphically equivalent Permian sandstones were deposited in various non-marine environments during an early stage of rifting at the base of the Alpidic cycle: they consist dominantly of quartz, feldspars and acidic to intermediate volcanic rock fragments. Source terrains consist of underlying Permian volcanic and terrigenous rocks of the pre-Permian crystalline basement. Three distinct diagenetic provinces have been differentiated, based on 1) the presence and nature of carbonate cement and/or replacement; 2) the presence of quartz cement; 3) the presence of kaolinization of detrital K-feldspar; and 4) the degree of recrystallization of the detrital clay matrix
Diagenetic provinces of the Verrucano Lombardo and Val Gardena sandstones (Permian), southern Alps, Italy / K. P., Helmold; Fontana, Daniela; R. G., Loucks. - In: RENDICONTI DELLA SOCIETÀ ITALIANA DI MINERALOGIA E PETROLOGIA. - ISSN 0037-8828. - STAMPA. - 38:(1982), pp. 1361-1386.
Diagenetic provinces of the Verrucano Lombardo and Val Gardena sandstones (Permian), southern Alps, Italy.
FONTANA, Daniela;
1982
Abstract
Diagenetic sequences and porosity in the arkosic and lithic Verrucano Lombardo and Val Gardena sandstones in N Italy are controlled dominantly by framework mineralogy and tectonic history. These stratigraphically equivalent Permian sandstones were deposited in various non-marine environments during an early stage of rifting at the base of the Alpidic cycle: they consist dominantly of quartz, feldspars and acidic to intermediate volcanic rock fragments. Source terrains consist of underlying Permian volcanic and terrigenous rocks of the pre-Permian crystalline basement. Three distinct diagenetic provinces have been differentiated, based on 1) the presence and nature of carbonate cement and/or replacement; 2) the presence of quartz cement; 3) the presence of kaolinization of detrital K-feldspar; and 4) the degree of recrystallization of the detrital clay matrix
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