Publication Date:
2024-01-22
Description:
The aseismicNazca Ridge produces localized flat-slab subduction beneath the South American
margin at latitudes 10 to 15 S. The geological evolution and the spatio-temporal pattern of deformation
of the upper plate have been strongly influenced by the presence of the flat slab. In this study, we
investigated the lithospheric thermal structure of this region by elaborating a 2D geothermal model
along a section across the top of the Nazca Ridge, the Peru–Chile trench, the Andean Cordillera, and the
Amazonian Basin, for a total length of 1000 km. For the sake of modelling, the crust of the overriding
plate was subdivided into two parts, i.e., a sedimentary cover (including the entire lithostratigraphic
sequence) and a crystalline basement. Applying an analytical methodology, we calculated geotherms
and isotherms by setting (i) thickness, (ii) density, (iii) heat production, and (iv) thermal conductivity
for each geological unit and considering (v) heat flux at theMoho, (vi) frictional heating produced by
faults, and (vii) plate convergence rate. The resulting model could make a significant advance in our
understanding of how flat slab geometry associated with the Nazca Ridge subduction affects the thermal
structure and hence the tectonic evolution of the region.
Description:
Published
Description:
7697
Description:
OST1 Alla ricerca dei Motori Geodinamici
Description:
JCR Journal
Keywords:
subduction zones
;
slab geometry
;
thermal structure
;
isotherms
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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