The Campanian Ignimbrite eruption (39 ka) is the most powerful caldera-forming event 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.
Facies variation in the Campanian Ignimbrite / Scarpati, Claudio; Sparice, Domenico; Annamaria, Perrotta. - In: RENDICONTI ONLINE DELLA SOCIETÀ GEOLOGICA ITALIANA. - ISSN 2035-8008. - 33:(2015), pp. 83-87. [10.3301/ROL:2015.20]
Facies variation in the Campanian Ignimbrite
SCARPATI, CLAUDIO;SPARICE, DOMENICO;
2015
Abstract
The Campanian Ignimbrite eruption (39 ka) is the most powerful caldera-forming event 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.
