scholarly journals Fault Control on a Thermal Anomaly: Conceptual and Numerical Modeling of a Low‐Temperature Geothermal System in the Southern Alps Foreland Basin (NE Italy)

2020 ◽  
Vol 125 (5) ◽  
Author(s):  
Marco Pola ◽  
Mauro Cacace ◽  
Paolo Fabbri ◽  
Leonardo Piccinini ◽  
Dario Zampieri ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Low Temperature ◽  
Foreland Basin ◽  
Thermal Anomaly ◽  
Southern Alps ◽  
Geothermal System ◽  
Ne Italy

Numerical modeling to well-head protection area delineation, an example in Veneto Region (NE Italy)

2015 ◽  
Vol 35 ◽  
pp. 232-235 ◽  
Author(s):  
Leonardo Piccinini ◽  
Paolo Fabbri ◽  
Marco Pola ◽  
Enrico Marcolongo ◽  
Alessia Rosignoli
Keyword(s):  
Numerical Modeling ◽  
Veneto Region ◽  
Ne Italy ◽  
Head Protection ◽  
Protection Area

Diachronous exhumation of the Carpathians from low-temperature thermochronology

2021 ◽  
Author(s):  
Marion Roger ◽  
Peter van der Beek ◽  
Arjan de Leeuw ◽  
Laurent Husson
Keyword(s):  
Low Temperature ◽  
Foreland Basin ◽  
The Black Sea ◽  
Oblique Collision ◽  
The Carpathians ◽  
Sediment Routing ◽  
Source To Sink ◽  
Zircon Fission Track ◽  
Eastern Carpathians ◽  
Exhumation Rates

<p>The Carpathians fold-and-thrust belt results from oblique collision of ALCAPA and Tisza-Dacia plates with the eastern European margin. It formed during the Oligocene and Miocene, propagating laterally from NW to SE as clearly demonstrated by balanced-cross sections (Nakapelyukh et al., 2017; Castellucio et al., 2016; Merten et al., 2010). The coeval development of the foreland basin (Roure et al., 1993) is revealed by an axial transport system that prograded from NW to SE, ultimately supplying sediments to the Black Sea (de Leeuw et al., 2020). However, lacking a regional synthesis and integration of thermochronology data, lateral propagation of exhumation in the orogen has not been demonstrated yet.</p><p> We reconstruct the exhumation history of the entire Carpathians from the Oligocene onwards and link it with the development of the Carpathians foreland basin (CFB) using a source-to-sink approach. We compiled more than 500 apatite and zircon fission-track and (U-Th)/He ages from the literature. This comprehensive database was separated by region (Western, Eastern, and South-Eastern Carpathians) and by tectonic domain (as defined in Schmid et al., 2008). This partitioning allows for the inversion of large datasets, reflects the tectonic complexity of the belt, and avoids spurious spatial correlations (Schildgen et al., 2018). The thermochronology data was inverted using Pecube (Braun et al., 2012) to constrain exhumation rates in a Bayesian approach. We thus obtain estimates of exhumation rates through time along the belt (with their uncertainty) and convert these into bulk  sediment fluxes over time, permitting tracking of sediment routing from the eroding belt to the CFB. Ultimately, these data will be used to unravel deeper geodynamics, including the possible effects of slab detachment on the evolution of the belt and its foreland basin.</p><p> </p><p>Key words: Low-temperature thermochronology, Carpathians, exhumation, source to sink, Pecube inversions.</p>

Low-temperature thermochronology and vitrinite reflectance data reveal longwavelength uplift in the Alpine foreland basin

2020 ◽  
Author(s):  
Sarah Louis ◽  
Elco Luijendijk ◽  
Christoph von Hagke ◽  
István Dunkl ◽  
Ralf Littke ◽  
...  
Keyword(s):  
Low Temperature ◽  
Large Scale ◽  
Vitrinite Reflectance ◽  
Foreland Basin ◽  
Molasse Basin ◽  
Data Set ◽  
Geodynamic Processes ◽  
Alpine Foreland ◽  
Alpine Foreland Basin ◽  
Reflectance Data

<p>Foreland basin sediments mirror the history of an orogeny. Deformation and geodynamic processes in low spatial extend (e.g. dozens of km) can be quantified using kinematic restoration. Processes happening deep underneath an orogen show a large spatial manifestation that is difficult to quantify in time and space. Marine units at surface outcrops show 900 m of net uplift since deposition in undeformed parts of the alpine foreland basin. Existing low-temperature thermochronology data from the Swiss part of the Molasse Basin show a thermal overprint that indicates exhumation of more than 1.5 km. We quantify the wavelength of deep seated processes of the Alpine orogen by generating and analyzing a holistic dataset of the entire alpine foreland basin. In addition to compiling existing data from the western part of the basin we have generated a new apatite (U-Th)/He and vitrinite reflectance data set from the central and eastern part of the basin. The new apatite (U-Th)/He ages in the German part of the basin show exhumation below or close to the detection limit (~1.5 km). Within the folded and thrusted Molasse, exhumation is localized along thrusts and the thermochronological data indicates thrusting between 10 to 20 Ma. Vitrinite reflectance data reveals a trend of exhumation increasing from East to West. Parts of the central German Molasse basin have been exhumed as well. Thus, on the large scale we can see longwave exhumation patterns in the western part of the basin that affect both the deformed and undeformed parts of the basin which cannot only be related to Jura thrusting.</p>

PALEOSEISMOLOGICAL INVESTIGATIONS AT THE FRONT OF THE EASTERN SOUTHERN ALPS (NE Italy)

2020 ◽  
Author(s):  
Giulia Patricelli ◽  
Maria Eliana Poli ◽  
Giovanni Paiero ◽  
Giovanni Monegato ◽  
Francesco Marinoni ◽  
...  
Keyword(s):  
Damage Zone ◽  
Southern Alps ◽  
Alluvial Fan ◽  
The South ◽  
Active Deformation ◽  
The North ◽  
Ne Italy ◽  
Structural Framework ◽  
Accademia Dei Lincei ◽  
The Village

<p>In the framework of the III level Seismic Microzonation of the Pieve del Grappa municipality (Treviso, NE Italy), three paleoseismological trenches were dug, in order to investigate activity and capacity of the Crespano del Grappa backthrust.</p><p>The study area is located in the Veneto foothills, where the Plio-Quaternary external front of the Eastern Southern Alps (Castellarin and Cantelli, 2000) presently propagates with a 2-3 mm/y velocity towards the south (Serpelloni et al., 2016). The external front is composed of a series of arcuated WSW-ENE striking, S verging structures (Galadini et al, 2005). Moreover, the area is characterized by a medium-to-low seismicity with only one M>6 earthquake during the last millennium: the 1695 Asolo event, Mw 6.45 (Rovida et al., 2016).</p><p>Regarding the structural framework, the study area is located between the Bassano-Vittorio Veneto Thrust to the north and the Bassano-Cornuda Thrust to the south. The investigated tectonic structure, i.e. the Bassano-Cornuda backthrust, is a N-verging E-W striking reverse structure. Moving from east to the west, it widely crops out near the Castelcucco village, causing a hundred meters displacement in the Miocene Molasse (Braga, 1970). In particular in Crespano village the thrust is responsible of an about 10 m vertical throw in the Quaternary alluvial conglomerates of Lastego river (Parinetto, 1987). Because of the urbanization, the paleoseismological trenches were realized at the eastern (Col Canil) and western (San Vito) borders of the village. In the former case, the trench cut through thick colluvial deposits that probably buried an abandoned valley. Differently, the second and the third trenches affected wide coalescent LGM alluvial fans, which border the southern slope of Mt. Grappa.</p><p>The results testify an intense Pleistocene-Holocene deformation of the Crespano del Grappa backthrust. Particularly, active deformation evidence deals with:</p><ul><li>back-tilting of the Holocene colluvial units;</li> <li>pronounced polyphasic liquefaction episodes, locally completely altering the sedimentary structures of colluvial units;</li> <li>a wide damage zone in the proximity of the morphological scarp and associated with the peak of the induced polarization. This observation testifies that the Crespano del Grappa backthrust reached the surface and displaced topography in the past, probably at the occurrence of one or more events which generated the paleoliquefaction effects;</li> <li>the 3-4 m displacement of the LGM alluvial fan deposits.</li> </ul><p>Concerning the age of the deformation, the dating of the involved units suggests a post LGM activation, probably recent-to-historical.</p><p> </p><p>REFERENCES</p><p>Braga GP, 1970. Rendiconti Fisici dell’Accademia dei Lincei, serie 8, 48(4): 451-455.</p><p>Castellarin A. and Cantelli L., 2000. Journal of Geodynamics. DOI: 10.1016/S0264-3707(99)00036-8.</p><p>Galadini et al., 2005. Geophysical Journal International. DOI: 10.1111/j.1365-246X.2005.02571.x.</p><p>Parinetto A., 1987. Aspetti morfotettonici del versante meridionale del Grappa e delle colline antistanti. Unpublished degree thesis. University of Padova, Italy.</p><p>Rovida et al., 2016. DOI: http://doi.org/10.6092/INGV.IT-CPTI15.</p><p>Serpelloni et al., 2016. Tectonophysics, https://doi.org/10.1016/j.tecto.2016.09.026.</p>

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