Using basin thermal history to evaluate the role of Miocene-Pliocene flat-slab subduction in the southern Central Andes (27 degrees S-30 degrees S)
AffiliationUniv Arizona, Dept Geosci
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CitationStevens Goddard, A. L. and Carrapa, B. (2018), Using basin thermal history to evaluate the role of Miocene–Pliocene flat‐slab subduction in the southern Central Andes (27° S–30° S). Basin Res, 30: 564-585. doi:10.1111/bre.12265
Rights© 2017 The Authors. Basin Research © 2017 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists
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AbstractStudies in both modern and ancient Cordilleran-type orogenic systems suggest that processes associated with flat-slab subduction control the geological and thermal history of the upper plate; however, these effects prove difficult to deconvolve from processes associated with normal subduction in an active orogenic system. We present new geochronological and thermochronological data from four depositional areas in the western Sierras Pampeanas above the Central Andean flat-slab subduction zone between 27 degrees S and 30 degrees S evaluating the spatial and temporal thermal conditions of the Miocene-Pliocene foreland basin. Our results show that a relatively high late Miocene-early Pliocene geothermal gradient of 25-35 degrees C km(-1) was typical of this region. The absence of along-strike geothermal heterogeneities, as would be expected in the case of migrating flat-slab subduction, suggests that either the response of the upper plate to refrigeration may be delayed by several millions of years or that subduction occurred normally throughout this region through the late Miocene. Exhumation of the foreland basin occurred nearly synchronously along strike from 27 to 30 degrees S between ca. 7 Ma and 4 Ma. We propose that coincident flat-slab subduction facilitated this widespread exhumation event. Flexural modelling coupled with geohistory analysis show that dynamic subsidence and/or uplift associated with flat-slab subduction is not required to explain the unique deep and narrow geometry of the foreland basin in the region implying that dynamic processes were a minor component in the creation of accommodation space during Miocene-Pliocene deposition.
Note12 month embargo; published online: 01 September 2017
VersionFinal accepted manuscript
SponsorsNSF GRF, National Geographic Young Explorer's Grant [9744-15]; GSA Graduate Student Research Grant