Crustal variations and terrane boundaries in southern Mexico as imaged by magnetotelluric transfer functions

Jording, A.; Ferrari, Luca; Arzate, Jorge; Jödicke, H.

doi:10.1016/s0040-1951(00)00166-9

Cited by 24 publications

(23 citation statements)

References 26 publications

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“…Magnetotelluric data acquired along a transect from the Pacific coast thorough the C-MVB and to the north [222] showed a low-resistivity zone beneath the C-MVB, which may well be consistent with the continental rift setting proposed in the present work.…”

Section: Magnetotellluricssupporting

confidence: 90%

Continental Rift Setting for the Central Part of the Mexican Volcanic Belt: A Statistical Approach

Verma¹

2009

TOGEOJ

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I prepared compilations of geochemical data from the central part of the Mexican Volcanic Belt (C-MVB), the Central American Volcanic Arc (CAVA) from Guatemala to northwestern Costa Rica, the continental arc of the Andes in South America, other mostly island arcs, extensional and continental break-up regions, and continental rifts. Using quantitative statistical methods, the origin of the C-MVB is constrained as a continental rift. Specifically, this continental rift setting for the C-MVB is inferred from conventional bivariate discrimination diagrams, new natural logarithmtransformed correct statistics-based discriminant function diagrams, quantitative Nb/Nb* parameter, and 99% confidence limits of the mean for the ratios of slab-or continental crust-sensitive and mantle-sensitive parameters. The subductionrelated models based on qualitative interpretations most commonly proposed for the Mexican Volcanic Belt in the literature are not supported from these robust quantitative constraints. All geological, structural, geochemical, isotopic (Sr, Nd, Pb, Os, and Be), and geophysical data are in fact consistent with this statistics-based conclusion of the continental rift setting and exclude involvement of the subducted slab from the genesis of the C-MVB magmas.

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Section: Magnetotellluricssupporting

confidence: 90%

Continental Rift Setting for the Central Part of the Mexican Volcanic Belt: A Statistical Approach

Verma¹

2009

TOGEOJ

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“…Magneto-telluric data acquired along the transect from the Pacific coast through the C-MVB and to the north (Jording et al, 2000) showed a low-resistivity zone beneath the C-MVB, which was interpreted by the authors as due to subduction fluids. The magneto-telluric data may well be consistent with the continental rift or extensional setting for the MVB proposed by Márquez et al (1999cMárquez et al ( , 2001, Sheth et al (2000), and Verma (2002Verma ( , 2004Verma ( , 2009.…”

Section: Magneto-telluric Evidencementioning

confidence: 75%

Present state of knowledge and new geochemical constraints on the central part of the Mexican Volcanic Belt and comparison with the Central American Volcanic Arc in terms of near and far trench magmas

Verma¹

2015

Turkish J Earth Sci

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A brief critical review is presented of the geological, geophysical, geochemical, and plate tectonic evidence for the origin and evolution of the central part of the Mexican Volcanic Belt (C-MVB). Databases were constructed for the C-MVB from new and published data as well as for the Central American Volcanic Arc (CAVA), other continental and island arcs, continental rifts or extensional areas, and collision zones. Conventional procedures as well as statistical techniques of multidimensional tectonic discrimination diagrams and significance tests were used to interpret the data. A subdivision of the databases for the C-MVB and CAVA into near the trench or front-arc and far from the trench or backarc magmas helped to demonstrate the lack of slab input for the C-MVB and the presence of a classic arc-trench system for the CAVA. The use of software IgRoCS, DODESSYS, UDASYS, TecD, and TecDIA provided the following conclusions: 1) basic magmas in the C-MVB that originated in the mantle without the involvement of the subducted slab represent a continental rift setting; 2) C-MVB acid and intermediate magmas that originated, respectively, from the crust and mixed mantle-crustal sources do not show a clear influence of the present subducted slab and represent the tectonic setting of the older crustal and mixed mantle-crustal source rocks; and 3) all rocks in the CAVA were derived from the involvement of the subducted slab and represent a classical continental arc system related to the subduction of the Cocos plate beneath the Caribbean plate, whereas CAVA back-arc rocks originated mainly in the mantle, probably with much less involvement of the subducted slab. Reinterpretation of the Sr, Nd, Pb, and Hf isotopic data supports these inferences. I propose a new tectono-petrogenetic model based on the continuation of the extensional tectonics related to the triple rift system in the western part of the MVB.

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“…Supporting this result, the regional MT study of JÖ DICKE (2006) did not detect an expected large electric contrast across the Oaxaca Fault at crustal depths along a transect passing south Oaxaca city. By analyzing the electrical impedance along a regional transect, JORDING et al (2000) concluded that the major structural change at depth in this region is b Figure 6 a Bottom Resistivity image and correlated seismicity associated to diverse tectonic processes across the SW-NE profile. Bending of the plate at the subduction front and dewatering reactions above the oceanic slab (B and C) define the main seismicity swarms observed.…”

Section: The Oaxaca-juarez Contact Zonementioning

confidence: 99%

Low Angle Contact Between the Oaxaca and Juárez Terranes Deduced From Magnetotelluric Data

Arzate-Flores

Molina-Garza

Corbo-Camargo

et al. 2016

Pure Appl. Geophys.

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We present the electrical resistivity model along a profile perpendicular to the Middle America trench in southern Mexico that reveals previously unrecognized tectonic features at upper to mid-crustal depths. Our results support the hypotheses that the upper crust of the Oaxaca terrane is a residual *20 km thick crust composed by an *10 km thick faulted crustal upper layer and an *10 km thick hydrated and/or mineralized layer. Oaxaca basement overthrust the younger Juárez (or Cuicateco) terrane. The electrical resistivity model supports the interpretation of a slab subducting at a low angle below Oaxaca. Uplift in the Oaxaca region appears to be related to fault reactivation induced by low angle subduction. In the Juárez terrane, isostatic forces may contribute to uplift because it is largely uncompensated. In the Sierra Madre del Sur, closer to the coast, uplift is facilitated by slabdehydration driven buoyancy. Both gravity and resistivity models are consistent with a thinned upper crust in the northeast end of the profile.

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Crustal variations and terrane boundaries in southern Mexico as imaged by magnetotelluric transfer functions

Cited by 24 publications

References 26 publications

Continental Rift Setting for the Central Part of the Mexican Volcanic Belt: A Statistical Approach

Continental Rift Setting for the Central Part of the Mexican Volcanic Belt: A Statistical Approach

Present state of knowledge and new geochemical constraints on the central part of the Mexican Volcanic Belt and comparison with the Central American Volcanic Arc in terms of near and far trench magmas

Low Angle Contact Between the Oaxaca and Juárez Terranes Deduced From Magnetotelluric Data

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