Mexico dating 2015
The El Doctor Platform is thrusted by the Tolimán Sequences on the western side of the study area (Fig. The highs and lows related to the carbonate basins and platforms were created in the Jurassic with the opening of the Gulf of Mexico, resulting in basin-and-range–type extension (Carrillo-Martinez et al., 2001; Gray et al., 2001).The carbonates were deposited in the Barremian–Cenomanian and the basinal deposits are characterized by deep-water muddy carbonates, whereas the platform rocks are fossiliferous shallow bank deposits (Imlay, 1944; Suter, 1987).
The study area spans four Cretaceous paleogeographical areas: the Zimapán and Tampico-Misantla Basins and the Valles–San Luis Potosi and El Doctor 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.
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.
In this study we examine remagnetized carbonate rocks from the central Sierra Madre Oriental (the Mexican fold-thrust belt) in order to develop a method for dating synfolding remagnetizations.