Stručni rad

https://doi.org/10.15233/gfz.2017.34.6

Magnetic susceptibility and natural gamma radioactivity as indirect proxies for characterization of sandstones and limestones of the Sabinas basin

José A. Batista Rodríguez ; Escuela Superior de Ingeniería, Universidad Autónoma de Coahuila, Coahuila, México
Joaquín A. Proenza Fernández ; Departament de Cristallografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, Universitat de Barcelona, Barcelona, 08028, Catalonia, Spain
Antonio Rodríguez Vega ; Escuela Superior de Ingeniería, Universidad Autónoma de Coahuila, Coahuila, México
Felipe de Jesus López Saucedo ; Escuela Superior de Ingeniería, Universidad Autónoma de Coahuila, Coahuila, México
Karla I. Cázares Carreón ; Escuela Superior de Ingeniería, Universidad Autónoma de Coahuila, Coahuila, México

Sažetak

An analysis of magnetic susceptibility and natural gamma radioactivity is presented as indirect proxies of the characteristics of sandstones and limestones of the Sabinas basin. These rocks are located in the sedimentary sequence ranging from the Upper Jurassic to the Cretaceous. The magnetic susceptibility indicates changes in the magnetic composition of these rocks and suggests changes in their weathering degree. Ranges of values of magnetic susceptibility in sandstones and limestones allow classifying them into different groups, suggesting variability regarding conditions of origin and evolution. High values of magnetic susceptibility in limestones can be linked to sedimentation in anoxic or reducing environment, as well as with its siliciclastic content. The natural gamma radioactivity expressed in the contents of Th and relationships U/K and Th/U also suggest the degree of weathering of these rocks, mainly in the sandstones. These relations also highlight others characteristics in the sandstones related the probable provenance of sediments, its distance, degree of weathering and transport dynamics. Using the values of U/K ratio in the sandstones, it is possible to suggest the probable quartzfeldspar relationships. These ratio values classified rocks as arkose or quartzarenite, indicating the maturity of the sandstones. According to the U/K ratio values, most of these rocks which show little maturity are called arkose. Using the values of the Th/U ratio, it is possible to suggest the textures of quartzarenites, classifying them as rocks with fabric that is clast-supported or matrix-supported.

Ključne riječi

magnetic susceptibility; natural gamma radioactivity; limestones; sandstones; Sabinas basin

Hrčak ID:

186294

URI

https://hrcak.srce.hr/186294

Datum izdavanja:

30.6.2017.

Podaci na drugim jezicima: hrvatski

Posjeta: 1.571 *