Basin Thermal Structure in the Chilean-Pampean Flat Subduction Zone

Collo, Gilda; Ezpeleta, Miguel; Dávila, Federico M.; Giménez, Mario; Soler, Santiago R.; Martina, Federico; Ávila, Pilar; Sánchez, Francisco Sánchez; Calegari, Ricardo; Lovecchio, Juan Pablo; Schiuma, Mario

doi:10.1007/978-3-319-67774-3_21

Cited by 7 publications

(18 citation statements)

References 65 publications

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“…3). We note that the implied present day gradients resulting from all the lower misfit candidates (~13°C/km to 5°C/km) are consistent with low thermal gradients derived from borehole measurements (Collo et al, 2018; 18 °C/Km). Collo et al (2018) highlighted a westward reduction of thermal gradients between 64°W and 68°W attributable to a flat-slab.…”

Section: Results and Discussion A) Misfit Distributionsupporting

confidence: 80%

“…propositions, the present effort represents the first attempt to quantify the influence of the Pampean flat slab subduction in the thermal regime of the AP. Our findings are similar to those seen in deep Vinchina Basin (around 10 km depth), where sediments belonging to the depocenter were not thermally reset during Miocene deformation (Collo et al, 2011(Collo et al, , 2015(Collo et al, , 2018. Such unreset AFT ages (and also U-Th/He ages, see sample JT01) within the AP, a fold-and-thrust belt where the magnitude of erosion is probably >5 km (see Zapata and Allmendinger, 1996;Jordan et al, 2001;Fosdick et al, 2015, Val et al, 2016Nassif et al, 2019), suggest that other heating/cooling mechanisms apart from burial and exhumation may need to be invoked.…”

Section: E) Regional Geodynamic Contextsupporting

confidence: 89%

“…Although a complex thermal structure is inferred for this region (Sánchez et al 2019) and some discrepancies exist regarding the associated thermal regime during the transition from normal to flat subduction (see Collo et al, 2011 andGoddard andCarrapa, 2018), the cooling of the thermal regime by 8 Myrs implied by our models is consistent with the inferred low heat flow in the region based on borehole, seismic, thermochronological and magnetic data (Marot et al, 2014;Collo et al, 2018;Sánchez et al 2019) et al, 1991, Gutscher 2002, Manea and Manea 2011.…”

Section: E) Regional Geodynamic Contextsupporting

confidence: 84%

“…Regarding its thermal state, the AP has been linked to refrigerated thermal regimes, as it sits over the Chilean-Pampean flat slab segment (see Collo et al, 2018). Shifting of the asthenospheric wedge caused by slab flattening is suggested to produce thermal cooling of the upper crust (Gutscher et al, 2000;English et al 2003;Álvarez et al 2014), with evidence of the 'cold state' provided in the Vinchina Basin.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

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Linking thermochronological data to transient geodynamic regimes; new insights from kinematic modeling and Monte Carlo sampling of thermal boundary conditions

Francisco

Gallagher

Ezpeleta

et al. 2021

Journal of South American Earth Sciences

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Section: Results and Discussion A) Misfit Distributionsupporting

confidence: 80%

Section: E) Regional Geodynamic Contextsupporting

confidence: 89%

Section: E) Regional Geodynamic Contextsupporting

confidence: 84%

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

See 2 more Smart Citations

Linking thermochronological data to transient geodynamic regimes; new insights from kinematic modeling and Monte Carlo sampling of thermal boundary conditions

Francisco

Gallagher

Ezpeleta

et al. 2021

Journal of South American Earth Sciences

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“…However, observed trends in the distribution of lithospheric strength are not highly sensitive to variations in these parameters (Text S7 and S8 in Supporting Information S1). With respect to the thermal field, a wide range of observations independent of our study, including seismic tomography (Marot et al, 2014;Wagner et al, 2005) and wellbore temperature and heat flow measurements (Collo et al, 2018;Hamza & Muñoz, 1996), indicate that the lithosphere in the northern foreland is significantly colder than its southern counterpart and the orogen. This also agrees with other modeling studies of the Sierras Pampeanas lithosphere (Ibarra et al, 2021;Meeβen, 2019).…”

Section: Implications Of Modeled Plate Strength For Upper-plate Seism...mentioning

confidence: 65%

Long‐Term Lithospheric Strength and Upper‐Plate Seismicity in the Southern Central Andes, 29°–39°S

Piceda

Scheck‐Wenderoth

Cacace

et al. 2022

Geochem Geophys Geosyst

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We examined the relationship between the mechanical strength of the lithosphere and the distribution of seismicity within the overriding continental plate of the southern Central Andes (SCA, 29°–39°S), where the oceanic Nazca Plate changes its subduction angle between 33°S and 35°S, from subhorizontal in the north (<5°) to steep in the south (∼30°). We computed the long‐term lithospheric strength based on an existing 3D model describing variations in thickness, density, and temperature of the main geological units forming the lithosphere of the SCA and adjacent forearc and foreland regions. The comparison between our results and seismicity within the overriding plate (upper‐plate seismicity) shows that most of the events occur within the modeled brittle domain of the lithosphere. The depth where the deformation mode switches from brittle frictional to thermally activated ductile creep provides a conservative lower bound to the seismogenic zone in the overriding plate of the study area. We also found that the majority of upper‐plate earthquakes occurs within the realm of first‐order contrasts in integrated strength (12.7–13.3 log Pam in the Andean orogen vs. 13.5–13.9 log Pam in the forearc and the foreland). Specific conditions characterize the mechanically strong northern foreland of the Andes, where seismicity is likely explained by the effects of slab steepening.

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New thermocronological data of the Cretaceous-Cenozoic clastic sequences from the VINCHINA basin: Linkage between burial, exhumation and thermal flow variations

Wunderlin

Collo

Parra

et al. 2021

Journal of South American Earth Sciences

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Basin Thermal Structure in the Chilean-Pampean Flat Subduction Zone

Cited by 7 publications

References 65 publications

Linking thermochronological data to transient geodynamic regimes; new insights from kinematic modeling and Monte Carlo sampling of thermal boundary conditions

Linking thermochronological data to transient geodynamic regimes; new insights from kinematic modeling and Monte Carlo sampling of thermal boundary conditions

Long‐Term Lithospheric Strength and Upper‐Plate Seismicity in the Southern Central Andes, 29°–39°S

New thermocronological data of the Cretaceous-Cenozoic clastic sequences from the VINCHINA basin: Linkage between burial, exhumation and thermal flow variations

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