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Deformation of the area occurred during the Late Cretaceous to Paleogene, with the basins dominated by folding and intense water-rock interaction (see Fitz-Díaz et al., 2011b, for details); while the platforms were thrust dominated and showed much less fluid-rock interaction (Aranda-Gómez et al., 2000; Fitz-Díaz et al., 2012).Deformation in the central Sierra Madre Oriental was dated (Fitz-Díaz et al., 2014) using the Ar/Ar illite dating technique; that study targeted fold and thrust dating in the region.It is ∼100–250 km wide, thinning to the southeast and dominated by Cretaceous carbonates (Fitz-Díaz et al., 2011a; Guzmán and de Cserna, 1963).The study area spans four Cretaceous paleogeographical areas: the Zimapán and Tampico-Misantla Basins and the Valles–San Luis Potosi and El Doctor Platforms.This remagnetization is only present where there is also evidence of clay diagenesis. Illitization associated with flexural folding of carbonate-shale successions in the study area (central Sierra Madre Oriental, Mexico) was examined (Fitz-Díaz and van der Pluijm, 2013; Fitz-Díaz et al., (2014).This hypothesis was further supported by Katz et al. Scanning electron microscopy, X-ray diffraction, stable isotope, and geochronological analyses of samples from several folds showed that illite grew along shear-related horizons during folding.We use cookies and other technologies to customize your experience, perform analytics and deliver personalized advertising on our sites, apps and newsletters and across the Internet based on your interests.By clicking “I agree” below, you consent to the use by us and our third-party partners of cookies and data gathered from your use of our platforms.

The growth of magnetite into a stable single-domain structure allows a remanent magnetization to be acquired, resulting in a chemically remagnetized unit (Hirt et al., 1993; Mc Cabe et al., 1989). (1998) presented evidence of a strong or detectable chemical remagnetization in the limestone-marl sequences of their study area, the Vocontian Trough (southeastern France). The occurrence of illite is associated with chemically remagnetized rocks in these studies, and the presence of smectite is associated with primary magnetizations or comparatively weaker chemical remagnetizations. Illitization from smectite or illite precursors is common in naturally deformed rocks (e.g., Vrolijk and van der Pluijm, 1999), offering the potential for radiometric dating of deformation (van der Pluijm et al., 2001).Cored samples were cut to 2.2 cm length with a dual bladed saw at the University of Michigan.Broken samples were glued back together with alumina cement and all specimens were labeled with Velvet underglaze nonmagnetic temperature-resistant paint.The studied clay samples in central Mexico were collected along the same Aptian–Albian shale horizon and in all cases these samples provided well-defined Ar-Ar illite ages that were younger than deposition.This is in good agreement with textural observation showing only one generation of authigenic illite in these rocks (Fitz-Díaz et al., 2014).

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