Dating synfolding remagnetization: Approach and field application (central Sierra Madre Oriental, Mexico)
Por:
Nemkin S.R., Fitz-Diaz E., van der Pluijm B., Van der Voo R.
Publicada:
1 oct 2015
Resumen:
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. 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. By combining 40Ar/39Ar deformation ages with new paleomagnetic results, we present a quantitative method for absolute dating of synfolding remagnetization. We find that the history of the central Sierra Madre Oriental involved two separate remagnetization events in our study area; synfolding remanence acquisition ca. 77 Ma (Late Cretaceous) in the Zimapán Basin and a younger synfolding remagnetization event ca. 44 Ma (mid-Eocene) in the Tampico-Misantla Basin. 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. © 2015 Geological Society of America.
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
Department of Earth and Environmental Sciences, University of Michigan, 2534 C.C. Little Building, 1100 North University Avenue, Ann Arbor, MI 48109, United States
All Open Access; Bronze
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