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Abstract:

Doubly vergent contractional structures are common features in many regions of the Central Andes. They represent the first-order structural style observed in the inverted Mesozoic basins located along the flat-slab subduction segment of northern Chile. Here, we present a comparative analyses based on geological data previously published and a series of analogue models that were applied to understand the geometry and kinematics of doubly vergent structures related to tectonic inversion, similar to those exposed along the Chanarcillo and Lautaro basins located in northern Chile at 28°S. Our experiments consisted of orthogonal shortening of sand–microbead mixture models located over two pre-existing antithetic master normal faults separated by a structural high to reproduce their tectonic inversion. During the tests, we evaluated the influence of the distance between the master normal faults and synorogenic sedimentation on the final configuration of the doubly vergent structures. The results showed that: a) the tectonic inversion of antithetic normal faults separated by structural highs geometrically reproduce the doubly vergent structures confined to the edge of the Chañarcillo and Lautaro basins. This pre-shortening initial configuration is required to create doubly vergent systems composed of opposite-dipping inverted faults; b) the initial separation distance between the antithetic normal faults strongly influenced the final configuration of the doubly vergent structures during their tectonic inversion. Narrow separations can produce more complex tectonic scenarios; c) the synorogenic sedimentation between the inverted faults can modify the final geometry of the doubly vergent inverted structures, since it allows the shortening to be preferentially accumulated by inversion anticlines. Finally we conclude that although these results can be comparable with the main structures present in the Mesozoic inverted basins of northern Chile, some geological features associated with thin-skinned deformation between the inverted faults remain speculative, because this situation could be more complex and we recommend taking our findings only as a first geological approximation. © 2017 Elsevier Ltd

Registro:

Documento: Artículo
Título:The doubly vergent inverted structures in the Mesozoic basins of northern Chile (28°S): A comparative analysis from field data and analogue modeling
Autor:Martínez, F.; Cristallini, E.
Filiación:Departamento de Geología, Universidad Católica del Norte, Angamos, Antofagasta 0610, Chile
Laboratorio de Modelado Geológico (LaMoGe), Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
Palabras clave:Doubly vergent structures; Inversion anticlines; Northern Chile; Structural highs; analog model; anticline; comparative study; deformation; inversion tectonics; Mesozoic; normal fault; Chile
Año:2017
Volumen:77
Página de inicio:327
Página de fin:340
DOI: http://dx.doi.org/10.1016/j.jsames.2017.02.002
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v77_n_p327_Martinez

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Citas:

---------- APA ----------
Martínez, F. & Cristallini, E. (2017) . The doubly vergent inverted structures in the Mesozoic basins of northern Chile (28°S): A comparative analysis from field data and analogue modeling. Journal of South American Earth Sciences, 77, 327-340.
http://dx.doi.org/10.1016/j.jsames.2017.02.002
---------- CHICAGO ----------
Martínez, F., Cristallini, E. "The doubly vergent inverted structures in the Mesozoic basins of northern Chile (28°S): A comparative analysis from field data and analogue modeling" . Journal of South American Earth Sciences 77 (2017) : 327-340.
http://dx.doi.org/10.1016/j.jsames.2017.02.002
---------- MLA ----------
Martínez, F., Cristallini, E. "The doubly vergent inverted structures in the Mesozoic basins of northern Chile (28°S): A comparative analysis from field data and analogue modeling" . Journal of South American Earth Sciences, vol. 77, 2017, pp. 327-340.
http://dx.doi.org/10.1016/j.jsames.2017.02.002
---------- VANCOUVER ----------
Martínez, F., Cristallini, E. The doubly vergent inverted structures in the Mesozoic basins of northern Chile (28°S): A comparative analysis from field data and analogue modeling. J. South Am. Earth Sci. 2017;77:327-340.
http://dx.doi.org/10.1016/j.jsames.2017.02.002