Open AccessStructural features of the Middle Tirso Valley (Central Sardinia - Italy) from geoelectrical and gravity data
Author(s) -
T. Andriani,
Roberto Balia,
M. Loddo,
G. Pecorini,
A. Tramacere
Publication year - 2009
Publication title -
annals of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 60
eISSN - 2037-416X
pISSN - 1593-5213
DOI - 10.4401/ag-3564
Subject(s) - geology , bouguer anomaly , horst , basement , seismology , fault (geology) , sedimentary rock , paleozoic , tectonics , gravity anomaly , geothermal gradient , volcano , paleontology , civil engineering , oil field , engineering
The Middle Tirso Valley is located in Central Sardinia and lies between two structural highs, the Marghine-Goceano chain and the Barbagia Paleozoic horst. The geological structures of the area, potentially interesting for its geothermal resources, are rather complex and dominated by two regional faults the Marghine fault and the Nuoro fault which affect the Palaeozoic basement and the Tertiary volcano-sedimentary deposits. Combined modelling of gravity and geoelectrical data defines the shape and extent of this Tertiary basin. The Bouguer anomaly is mainly characterized by a three-dimensional gravity low which has been named «Bolotana-Sedilo gravity low», corresponding to a structure generated by collapses attributable to transcurrent and extensional tectonic events. The down faulted zone is filled with a Tertiary low density volcano-sedimentary sequence extending southwards and overlain by Pliocene-Quaternary basalts. Another regional structure named «Tirso Fault» is propose