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Book Chapter

Three-dimensional reconstruction of the main unconformities of the Colli Albani stratigraphy and deposit volume calculations

By
G. Diano
G. Diano
1
Dipartimento di Scienze Geologiche, Università degli Studi di RomaTre, Largo S. Leonardo Murialdo, 1, 00146, Roma, Italy
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A. Bonamico
A. Bonamico
2
Parco Regionale dell’Appia Antica, Roma, Italy
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G. Giordano
G. Giordano
1
Dipartimento di Scienze Geologiche, Università degli Studi di RomaTre, Largo S. Leonardo Murialdo, 1, 00146, Roma, Italy
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Published:
January 01, 2010

Abstract

The quiescent Colli Albani volcano is composed of overlapping edifices, with each showing changes in volcanic style over the 600-ka history of the volcanic field. The edifices and changes in eruption style through time are indicated in the field by the major unconformities, which have been identified from surface geology and borehole stratigraphies. This reconstruction of the major unconformities allows for three-dimensional geometric reconstruction of the relevant rock packages, computation of the deposit volumes, and evaluation of syn-volcanic tectonic or volcano-tectonic activity. Furthermore, some rock packages, such as the Pisolitic Tuffs, the Tufo Lionato and the Albano maar deposits, are characterized by relatively low permeability, and are therefore essential for modelling of the hydrogeological circulation and flow of volcanic gases. The reconstructions of the isopachs of the three main caldera-forming ignimbrites erupted between 460 and 355 ka have allowed the calculation of their minimum preserved extracaldera volumes at 59 km3 (Pozzolane Rosse), 20 km3 (Pozzolane Nere) and 30 km3 (Villa Senni Fm.) respectively. The total volume of volcanic deposits erupted after the last caldera collapse (<355 ka) is calculated as 34.7 km3. The preserved deposits of the most recent Albano polygenetic maar have been calculated to be 0.9 km3.

The total minimum deposit volume of the Colli Albani volcano is 208.1 km3. This volume does not include the intracaldera ignimbrite volumes which may add some 80 km3 to the total volume.

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Contents

Special Publications of IAVCEI

The Colli Albani Volcano

Geological Society of London
Volume
3
ISBN electronic:
9781862396258
Publication date:
January 01, 2010

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