High-temperature rapid pyrometamorphism induced by a charcoal pit burning: The case of Ricetto, central Italy

Abstract

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Non-Magmatic Glasses

“…Moreover, the occurrence of ferromagnesian droplets coalescing into a felsic amorphous matrix has been reported also for pyrometamorphic materials (e.g. Capitanio et al 2004).…”

“…Examples of modern creation of pyrometamorphic materials are known from burning of a wide range of fossil fuels, from spontaneous combustion but also other natural or anthropogenic ignition (Kuenzer & Stracher 2012). Combustion in coal mining 'spoil heaps' has resulted in recent pyrometamorphic processes in Russia (Chelyabinsk) (Sokol et al 1998) and Italy (Ricetto) (Capitanio et al 2004;Stoppa et al 2005) (Figure 2). One of the interesting features of the assemblage in Russia is the presence of pure glassy carbon, known as shungite.…”

Cement kiln dust/rice husk ash as a low temperature route for wollastonite processing

“…Akermanite (one member of the melilite group) is a loosely-defined mineral deficient in silica [54]. It crystallizes from silica and alumina poor, alkalirich compositions at 700 °C [55]. Among the elements (Na, K, Ca, Mg), Na is the most important element, if not the sole influence on akermanite crystallization [55].…”

“…It crystallizes from silica and alumina poor, alkalirich compositions at 700 °C [55]. Among the elements (Na, K, Ca, Mg), Na is the most important element, if not the sole influence on akermanite crystallization [55]. According to (Na+K+Mg+Ca/Al+Si) ratio, the specimen A 30 is depleted in silica and alkali-rich while in contrast the specimens A 35 -A 55 are silica-rich and alkali-poor.…”

The Vesuvius and the other volcanoes of Central Italy

“…However, heteromorphism also occurs as in the lamproites (Yoder, 1986) but Sahama (1974) suggested keeping the old names (i.e., katungite, mafurite, ugandite) for each rock, 16 excursion notes carbonatites in Italy. Stoppa & Woolley (1997) reviewed possible occurrences of carbonatites in Italy including also some rocks thought to be pyrometamorphic rocks due to either natural or anthropogenic combustion of marly sedimentary rocks (e.g., Stoppa, 1988;Melluso et al, 2003Melluso et al, , 2005aMelluso et al, , 2005bCapitanio et al 2004;Stoppa et al, 2005), in other cases some of them have been questioned as the result of carbonate syntexis resulting in a dilution of major and trace element contents, but not of CaO (Peccerillo 1998;Peccerillo, 2004Peccerillo, , 2005bWoolley et al, 2005). Unquestioned mantle-derived alvikitic rocks have been documented at Monticchio monogenetic field (e.g., Jones et al, 2000;D'Orazio et al, 2007).…”