Relation between diagenetic evolution and tectonic regimes in thrust-fold belt - The Calcari Grigi Group, Jurassic, Asiago Plateau, Northern Italy

A. Ceriani, R. Di Cuia, A. Scifoni, A. Riva

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Dolomitization and dolomite cements precipitation in Jurassic platform carbonates has been studied from outcrop samples of the Calcari Grigi Group (eastern Southern Alps, northern Italy). In the studied area various types of dolomites can be described at all scales of observation. On outcrops, primary dolomite can be recognised only in some stratigraphic intervals. By contrast, pervasive replacive dolomites are widespread throughout the area, mostly confined in the central and lower part of the sequence. The collected data demonstrate that the massive dolomite replacement was followed by a multiphase precipitation of dolomite and late calcite cements. The replacement occurred during burial, into a passive margin regime, due to compaction driven flow of formational fluids. Conversely, fluid inclusions data crossed with thermal history prove that dolomite and calcite cements precipitated when the study area was involved in collisional tectonics. Fluid inclusions data display a decreasing salinity trend from sea water to freshwater fluids. This observed dilution of fluids can be related to the infiltration of meteoric waters from the emerging Alpine chain. These data proof useful to interpret the diagenetic evolution of the unit as related to the evolution of the hydrogeological system in relation with the tectonic regime of the area.

Original languageBritish English
Title of host publicationSociety of Petroleum Engineers - 70th European Association of Geoscientists and Engineers Conference and Exhibition - Incorporating SPE EUROPEC 2008
Pages15-19
Number of pages5
StatePublished - 2008
Event70th European Association of Geoscientists and Engineers Conference and Exhibition - Incorporating SPE EUROPEC 2008 - Rome, Italy
Duration: 9 Jun 200812 Jun 2008

Publication series

Name70th European Association of Geoscientists and Engineers Conference and Exhibition 2008: Leveraging Technology. Incorporating SPE EUROPEC 2008
Volume1

Conference

Conference70th European Association of Geoscientists and Engineers Conference and Exhibition - Incorporating SPE EUROPEC 2008
Country/TerritoryItaly
CityRome
Period9/06/0812/06/08

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