Reconstruction of the fluid flow history during Laramide foreland fold and thrust belt development in eastern Mexico: cathodoluminescence and delta O-18-delta C-13 isotope trends of calcite-cemented fractures
Journal of geochemical exploration vol:78-9 pages:163-167
The Cordoba Platform in eastern Mexico has been studied to reveal the deformation and fluid flow history of the Laramide fore and fold and thrust belt (FFTB) and to define the controlling parameters on hydrocarbon reservoir development. Cathodoluminescence (CL) and stable isotope analyses of calcite-cemented strata and fractures point out different episodes of fluid flow that have been coupled to the deformation agenda. This study reveals an early burial phase with host-rock-buffered fluids and overpressures resulting in hydraulic fractures that relate to foreland flexuring with additionally local karst development. Layer-parallel shortening is accompanied by expulsion of formation waters that are no longer host-rock-buffered. Subsequent folding and thrusting led to opening of vertical features and finally to the influx of meteoric fluids and telogenetic karst development in the outcropping part of the FFTB. In the tectonic front, thrust emplacement was associated with intensive fracturing and subsequent oil migration, (C) 2003 Published by Elsevier Science B.V.