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The Late Palaeozoic glaciation subsurface record, Chaco Basin (Bolivia)

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Résumé

Late Palaeozoic glaciation is the longest of the Phanerozoic era. It is recorded in numerous Gondwanian basins, some having a high petroleum potential like the Chaco Basin. In this basin, the quality of the available seismic, well and outcrop data permits to characterise the Late Palaeozoic glacial record. Palaeovalleys >500 m deep and ~7 km wide have here been analysed. Focusing on the glaciogenic Carboniferous deposits, the seismic data with well-ties and their outcrop analogues provide new sedimentological insights. The palaeovalley infill is imaged as a chaotic seismic facies overlain by an aggrading-prograding prism, interpreted as tillites covered by a fluvio-deltaic system respectively. Tillites form both under the ice and during rapid ice recession whereas fluvio-deltaic systems can only originate from a stable ice margin and last until the ice sheets withdraw inland. These two depositional modes are repeated several times generating the progressive burial of the Carboniferous palaeovalleys. This succession of erosions and fills records major glacial stages containing a series of glacial and interglacial phases from the Late Devonian to the Early Permian. Depicting the Late Palaeozoic glacial history of the Chaco Basin seems crucial for the localisation of potential good reservoirs.
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Dates et versions

hal-00518389 , version 1 (17-09-2010)

Identifiants

  • HAL Id : hal-00518389 , version 1

Citer

François Bache, Julien Moreau, Jean-Loup Rubino, Christian Gorini, Brigitte van Vliet-Lanoë. The Late Palaeozoic glaciation subsurface record, Chaco Basin (Bolivia). 2010. ⟨hal-00518389⟩
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