1887
Volume 22 Number 6
  • E-ISSN: 1365-2117

Abstract

ABSTRACT

In order to evaluate the relationship between thrust loading and sedimentary facies evolution, we analyse the progradation of fluvial coarse‐grained deposits in the retroarc foreland basin system of the northern Andes of Colombia. We compare the observed sedimentary facies distribution with the calculated one‐dimensional (1D) Eocene to Quaternary sediment‐accumulation rates in the Medina wedge‐top basin and with a three‐dimensional (3D) sedimentary budget based on the interpretation of ∼1800 km of industry‐style seismic reflection profiles and borehole data. Age constraints are derived from a new chronostratigraphic framework based on extensive fossil palynological assemblages. The sedimentological data from the Medina Basin reveal rapid accumulation of fluvial and lacustrine sediments at rates of up to ∼500 m my−1 during the Miocene. Provenance data based on gravel petrography and paleocurrents reveal that these Miocene fluvial systems were sourced from Upper Cretaceous and Paleocene sedimentary units exposed to the west in the Eastern Cordillera. Peak sediment‐accumulation rates in the upper Carbonera Formation and the Guayabo Group occur during episodes of coarse‐grained facies progradation in the early and late Miocene proximal foredeep. We interpret this positive correlation between sediment accumulation and gravel deposition as the direct consequence of thrust activity along the Servitá–Lengupá faults. This contrasts with one class of models relating gravel progradation in more distal portions of foreland basin systems to episodes of tectonic quiescence.

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2010-02-02
2024-04-25
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Input parameters for decompaction of the Cenozoic Strata of the Medina Basin. Description and interpretation of Lithofacies (after Miall, 1996; Einsele, 2000). Velocity models for seven boreholes in the Medina and Llanos basins. Locations of wells are shown in Fig. 1a. Models are based on check‐short surveys measuring the seismic travel‐time from the surface to known depths. Since velocity gradient decreases eastward toward the Llanos basin, we used an average values for each block of the Guacaramo thrust. See text for further explanation.Please note: Wiley‐Blackwell are not responsible for the content or functionality of any supporting materials supplied by the authors. Any queries (other than missing material) should be directed to the corresponding author for the article.

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  • Article Type: Research Article

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