Newly-formed illite preserves fluid sources during folding of shale and limestone rocks; an example from the Mexican Fold-Thrust Belt

We combine structural, fluid-inclusion microthermometry, illite-crystallinity, X-Ray Diffraction (XRD) and O and H stable isotope analyses of authigenic illite to determine the source of local fluids interacting with rock during folding in anchizonal shales of the Mexican Fold-Thrust Belt (MFTB). A...

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Bibliographic Details
Published in:Earth and planetary science letters 2014-04, Vol.391, p.263-273
Main Authors: Fitz-Díaz, Elisa, Camprubí, Antoni, Cienfuegos-Alvarado, Edith, Morales-Puente, Pedro, Schleicher, Anja M., van der Pluijm, Ben
Format: Article
Language:English
Subjects:
Calcite
Clay minerals
Fluid dynamics
Fluid flow
fluid inclusions
Fluids
folds
Illite
Rocks
Shale
stable isotopes
Veins
water
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Summary:We combine structural, fluid-inclusion microthermometry, illite-crystallinity, X-Ray Diffraction (XRD) and O and H stable isotope analyses of authigenic illite to determine the source of local fluids interacting with rock during folding in anchizonal shales of the Mexican Fold-Thrust Belt (MFTB). A well-exposed train of mesoscopic, asymmetrical folds in a sequence of Cretaceous limestones interbedded with shale was targeted for this study. We test the hypothesis that syn-folding vein minerals and clay minerals were formed from the same fluids by comparing the δ2H composition of inclusion fluids in calcite and quartz from veins, and from illite concentrates from sheared shale layers, and the sources of that fluid. Five clay size-fractions (
ISSN:0012-821X
1385-013X
DOI:10.1016/j.epsl.2013.12.025