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| Titel |
Geometry of the inverted Cretaceous Chañarcillo Basin based on 2-D gravity and field data – an approach to the structure of the western Central Andes of northern Chile |
| VerfasserIn |
F. Martinez, A. Maksymowicz, H. Ochoa, D. Díaz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 4 ; Nr. 6, no. 4 (2015-12-03), S.1259-1276 |
| Datensatznummer |
250115527
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| Publikation (Nr.) |
 copernicus.org/se-6-1259-2015.pdf |
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| Zusammenfassung |
| This paper discusses an integrated approach that provides new ideas about the
structural geometry of the NNE-striking, Cretaceous Chañarcillo Basin
located along the eastern Coastal Cordillera in the western Central Andes of
northern Chile (27–28° S). The results obtained from the
integration of two transverse (E–W) gravity profiles with previous geological
information show that the architecture of this basin is defined by a large
NNE–SSE-trending and east-vergent anticline ("Tierra Amarilla
Anticlinorium"), which is related to the positive reactivation of a former
Cretaceous normal fault (Elisa de Bordos Master Fault). Moreover,
intercalations of high and low gravity anomalies and steep gravity gradients
reveal a set of buried, west-tilted half-grabens associated with a synthetic
normal fault pattern. These results, together with the uplift and folding
style of the Cretaceous synextensional deposits recognized within the basin,
suggest that its structure could be explained by an inverted fault system
linked to the shortening of pre-existing Cretaceous normal fault systems.
Ages of the synorogenic deposits exposed unconformably over the frontal limb
of the Tierra Amarilla Anticlinorium confirm a Late Cretaceous age for the
Andean deformation and tectonic inversion of the basin. |
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