Mexico dating 2015

Local-scale folds were targeted and 6–10 samples were collected per site using a portable Pomeroy EZ Core Drill.

A Brunton compass and inclinometer were used to determine the azimuth and plunge of the core samples and the orientation of the beds.

The absolute age of folds was determined by clay grain-size separation, illite polytype characterization, and Ar dating of multiple size fractions (Fitz-Díaz and van der Pluijm, 2013; Haines and van der Pluijm, 2008).

Ages of thrusting were determined for the Tolimán Sequences (83.5 ± 1.5 Ma) on the western edge of the study area, the western and eastern Zimapán Basin (82 ± 0.5 Ma and 76.5 ± 1.0 Ma, respectively), and the western and eastern Tampico-Misantla Basin (64 ± 2.0 Ma and 43.5 ± 0.5 Ma, respectively); see Figure 2 for details (Fitz-Díaz et al., 2014).

Carbonates that contain interlayered shales with radiometrically datable authigenic illite present an opportunity to directly determine the age of synfolding paleomagnetic remagnetizations.

By combining radiometric Ar/Ar dating of illitization in folds and thrusts with synfolding remagnetization, an absolute age for synfolding remagnetizations can be determined.

Mexico dating 2015-41Mexico dating 2015-51

77 Ma (Late Cretaceous) in the Zimapán Basin and a younger synfolding remagnetization event ca. The growth of magnetite leading to chemical remagnetization detected in these limestones is interpreted as the result of rock interactions with an Fe-bearing fluid.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.By combining newly determined ages of illitization in folds with new paleomagnetic results in Mexico’s central Sierra Madre Oriental, this study demonstrates the ability to associate a radiometric age with synfolding remagnetizations.Extensive work has shown that many carbonates around the world have been remagnetized (Jackson and Swanson-Hysell, 2012; Mc Cabe and Elmore, 1989; Van der Voo and Torsvik, 2012), highlighting the potentially wide-scale application of this approach.

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