The role of trapped fluids during the development and deformation of a carbonate/shale intra-wedge tectonic mélange (Mt. Massico, Southern Apennines, Italy)

Smeraglia, Luca; Aldega, Luca; Bernasconi, Stefano M.; Billi, Andrea; Boschi, Chiara; Caracausi, Antonio; Carminati, Eugenio; Franchini, Stefania; Rizzo, Andrea Luca; Rossetti, Federico; Vignaroli, Gianluca

doi:10.1016/j.jsg.2020.104086

Cited by 15 publications

(6 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent studies from the Apennines based on meso/microstructural and geochemical results on similar deformation zones, fault rocks, and mineralizations have also documented that thrust-related deformation zones (especially in marl-rich successions) dominated by S-C fabrics and distributed deformation represent lowpermeability barriers (Curzi et al, 2020a(Curzi et al, , 2021Smeraglia et al, 2020). In the broader study area as well as in the central-northern Apennines, thrust-related structures like those described here are commonly reported and extensively documented (Coli and Sani, 1990;Calamita et al, 1991Calamita et al, , 2012Vannucchi et al, 2003;Tesei et al, 2014;Lena et al, 2015;Pace et al, 2015Pace et al, , 2022bCurzi et al, 2020aCurzi et al, , 2021Satolli et al, 2020).…”

Section: Implications On the Permeability Structure Of Fault Zonessupporting

confidence: 68%

Architecture and permeability structure of the Sibillini Mts. Thrust and influence upon recent, extension-related seismicity in the central Apennines (Italy) through fault-valve behavior

et al. 2023

View full text Add to dashboard Cite

The central Apennines are a fold-thrust belt currently affected by post-orogenic extensional seismicity. To constrain the influence that the inherited thrust-related structures exert on the present seismic behavior of the belt, we provide the high-resolution structural and hydraulic characterization of one of the most external exposed thrust fault systems of the central Apennines, the Sibillini Mts. Thrust Front (STF). We integrate structural mapping, multiscale structural analysis, and in situ air permeability on the brittle structural facies of the thrust zone. We also performed K-Ar dating of selected fault rocks to better constrain structural inheritance. The STF is defined by a complex, ∼300-m-thick deformation zone involving Meso-Cenozoic marl and limestone that results from the accommodation of both seismic and aseismic slip during shortening. Permeability measurements indicate that the low permeability (10−2 ÷ 10−3 D) of the marly rich host rock diminishes within the thrust zone, where the principal slip surfaces and associated S-C structures represent efficient hydraulic barriers (permeability down to ∼3 × 10−10 D) to sub-vertical fluid flow. Field data and K-Ar dating indicate that the STF began its evolution ca. 7 Ma (early Messinian). We suggest that the studied thrust zone may represent a barrier for the upward migration of deep fluids at the hypocentral depth of present-day extensional earthquakes. We also speculate on the influence that similar deformation zones may have at depth on the overall regional seismotectonic pattern by causing transient fluid overpressures and, possibly, triggering cyclic extensional earthquakes on normal faults prone to slip while crosscutting the earlier thrust zones (as per a classic fault valve behavior). This mechanism may have controlled the origin of the 2016−2017 central Apennines devastating earthquakes.

show abstract

Section: Implications On the Permeability Structure Of Fault Zonessupporting

confidence: 68%

Architecture and permeability structure of the Sibillini Mts. Thrust and influence upon recent, extension-related seismicity in the central Apennines (Italy) through fault-valve behavior

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Further, it must be noted that the presented conceptual model concerning the geogas uprising along active faults for central-southern Italy is greatly supported by many recent bibliographic references [116,117,[127][128][129][130][131][132]. Moreover, in the shallow aquifer, the violent piping also produced occasional gravel throwing outside the ground level, as attested by the coeval sources, and the enlargement of the gas-induced sinkhole.…”

Section: Discussion: the Earthquake-induced Gas Eruption Hypothesismentioning

confidence: 61%

Seismic Soil Characterization to Estimate Site Effects Induced by Near-Fault Earthquakes: The Case Study of Pizzoli (Central Italy) during the Mw 6.7 2 February 1703, Earthquake

et al. 2021

View full text Add to dashboard Cite

Many of the urban settlements in Central Italy are placed nearby active faults and, consequently, the ground motion evaluation and seismic site effects under near-fault earthquakes are noteworthy issues to be investigated. This paper presents the results of site investigations, the seismic site characterization, and the local seismic response for assessing the effects induced by the Mw 6.7 2 February 1703, near-fault earthquake at the Madonna delle Fornaci site (Pizzoli, Central Italy) in which notable ground failure phenomena were observed, as witnessed by several coeval sources. Even though recent papers described these phenomena, the geological characteristics of the site and the failure mechanism have never been assessed through in-situ investigations and numerical modeling. Within a project concerning the assessment of soil liquefaction potential and co-seismic ground failure, deep and shallow continuous core drilling, geophysical investigations and in-hole tests have been carried out. Subsequently, the geotechnical model has been defined and the numerical quantification of the different hypotheses of failure mechanisms has been evaluated. Analyses showed that liquefaction did not occur, and the excess pore water pressure induced by the shaking was not the source of the ground failure. Therefore, it was hypothesized that the sinkhole was likely caused by earthquake-induced gas eruption.

show abstract

“…A variable contamination by atmosphere-derived fluids is highlighted by the 4 He/ 20 Ne values, with the lowest fraction of contamination found in gases from Spilamberto and Cavone. The Rc/Ra values vary in a narrow range (0.014-0.040 Ra, Table 6) typical of crustal fluids, without evident contributions of mantle-derived helium, as recorded in natural gas emissions of the central-northern Apennines (e. g., Sciarra et al, 2019;Smeraglia et al, 2020). The 40 Ar/ 36 Ar ratio may give further clues on the contribution by atmospheric fluids and radiogenic 40 Ar.…”

Section: Noble Gasesmentioning

confidence: 95%

Sources and migration pathways of methane and light hydrocarbons in the subsurface of the Southern Po River Basin (Northern Italy)

Ricci

Cremonini

Severi

et al. 2023

Marine and Petroleum Geology

Self Cite

View full text Add to dashboard Cite

The role of trapped fluids during the development and deformation of a carbonate/shale intra-wedge tectonic mélange (Mt. Massico, Southern Apennines, Italy)

Cited by 15 publications

References 76 publications

Architecture and permeability structure of the Sibillini Mts. Thrust and influence upon recent, extension-related seismicity in the central Apennines (Italy) through fault-valve behavior

Architecture and permeability structure of the Sibillini Mts. Thrust and influence upon recent, extension-related seismicity in the central Apennines (Italy) through fault-valve behavior

Seismic Soil Characterization to Estimate Site Effects Induced by Near-Fault Earthquakes: The Case Study of Pizzoli (Central Italy) during the Mw 6.7 2 February 1703, Earthquake

Sources and migration pathways of methane and light hydrocarbons in the subsurface of the Southern Po River Basin (Northern Italy)

Contact Info

Product

Resources

About