The Campanian Ignimbrite (39 ka) is the most powerful caldera-forming eruption vented from Campi Flegrei. The pyroclastic density current (PDC) deposits associated to this plinian, high-magnitude event are mainly known as a widespread welded gray trachytic tuff containing inverse-graded scoria clasts. A new study of the lithological facies of the medial-distal CI PDC deposits has highlighted the occurrence of five different lithofacies: massive, stratified, sand-wave, inverse-graded, normal-graded. These lithofacies exhibit three main vertical association: stratified/sand-wave to massive, stratified to inverse/normal-graded, massive to inverse-graded. The facies associations reflect changing in style of deposition from the base of an ???unsteady??? pyroclastic density current.
Variazioni di facies nell'Ignimbrite Campana / Scarpati, Claudio; Sparice, Domenico. - (2014). (Intervento presentato al convegno IV Convegno nazionale Società Geologica Italiana ??? Sezione Giovani: Le Smart Cities si edificano sulla geologia tenutosi a Roma nel 19-21/06/2014).
Variazioni di facies nell'Ignimbrite Campana
SCARPATI, CLAUDIO;SPARICE, DOMENICO
2014
Abstract
The Campanian Ignimbrite (39 ka) is the most powerful caldera-forming eruption vented from Campi Flegrei. The pyroclastic density current (PDC) deposits associated to this plinian, high-magnitude event are mainly known as a widespread welded gray trachytic tuff containing inverse-graded scoria clasts. A new study of the lithological facies of the medial-distal CI PDC deposits has highlighted the occurrence of five different lithofacies: massive, stratified, sand-wave, inverse-graded, normal-graded. These lithofacies exhibit three main vertical association: stratified/sand-wave to massive, stratified to inverse/normal-graded, massive to inverse-graded. The facies associations reflect changing in style of deposition from the base of an ???unsteady??? pyroclastic density current.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.