Mexico dating 2015

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.

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).

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

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.See our Privacy Policy and Third Party Partners to learn more about the use of data and your rights. Growth of magnetite has been variably linked to fluid-bearing events or clay diagenesis, and the development of a chemical remagnetization as a result of such events.The ability to successfully date mesoscopic folds made this an ideal area to test the feasibility of absolute dating of synfolding remagnetizations.Twenty-eight sites from the Barremian–Cenomanian Tamaulipas Formation were sampled in the central Sierra Madre Oriental (Mexican fold-thrust belt) (Fig. The Tamaulipas Formation is the focus of this study because of the accessibility and large-scale areal extent of this unit.

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