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Paleomagnetism and tectonics from the late Pliocene to late Pleistocene in the Xalapa monogenetic volcanic field, Veracruz, Mexico

L. M. Alva-Valdivia, A. Agarwal, B. Garcia-Amador, W. Morales-Barrera, K. K. Agarwal, S. Rodriguez and J. A. Gonzalez-Rangel
Paleomagnetism and tectonics from the late Pliocene to late Pleistocene in the Xalapa monogenetic volcanic field, Veracruz, Mexico
Geological Society of America Bulletin (March 2019) Pre-Issue Publication

Abstract

The Xalapa monogenetic volcanic field, Veracruz, Mexico is located at the eastern end of the Trans-Mexican Volcanic Belt. This study uses specimens from 0.8 ka to 5.96 + or - 0.156 Ma Xalapa lava deposits and from 4.5 + or - 0.028 Ma La Concha ignimbrite. The study identifies the magnetic mineralogy by reflected light microscopy, thermomagnetic curves, and coercivity estimates. It further defines the magnetic domain size distribution by hysteresis plots, Day diagrams, and first-order-reversal-curves. Characteristic remanent directions and virtual geomagnetic poles are also calculated. The characteristic remanent directions are used to establish the magnetostratigraphy and to identify the net rotation experienced, at each site, since the emplacement. The results allow the identification of the rotation domains, and R'-, P-, and Y-shears, active since the past approximately 2.5 m.y. in the region and a better characterization of the displacement along the Rio Actopan fault, active in the Xalapa monogenetic volcanic field.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: Pre-Issue Publication
Title: Paleomagnetism and tectonics from the late Pliocene to late Pleistocene in the Xalapa monogenetic volcanic field, Veracruz, Mexico
Affiliation: Universidad Nacional Autonoma de Mexico, Instituto de Geofisica, Mexico City, Mexico
Published: 20190320
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 43
Accession Number: 2019-029458
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019121
Illustration Description: illus. incl. 1 table, geol. sketch maps
N19°00'00" - N20°00'00", W97°00'00" - W96°00'00"
Secondary Affiliation: University of Lucknow, IND, India
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 2019
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