Tears, windows, and signature of transform margins on slabs. Images of the Cocos plate fragmentation beneath the Tehuantepec isthmus (Mexico) using Enhanced Seismic Models

Calò, Marco

doi:10.1016/j.epsl.2021.116788

Cited by 19 publications

(20 citation statements)

References 42 publications

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“…The LTVF lies in a very different context. The occurrence of the active San Martín Tuxtla polygenetic volcano within the monogenetic field suggests the existence of one or several large magma bodies underneath, which is supported by the gravity data (Espindola et al 2016) and recent seismic data (Castellanos et al 2018;Calò 2021). These probably act as magma reservoirs from which the dikes feeding the monogenetic vents radiate, following vertical strikeslip faults created by crustal stresses.…”

Section: Magma Source Geometrymentioning

confidence: 65%

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Monogenetic volcanism in subduction settings: comparative statistical study of the Sierra Chichinautzin and Los Tuxtlas Volcanic Fields in Mexico

et al. 2023

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Monogenetic fields present significant diversity, yet this diversity has not been fully quantified, and its origin remains elusive. We studied two large subduction-related fields in Mexico, the Sierra Chichinautzin and Los Tuxtlas, that have distinct crustal stress regime and structures, magma compositions, vent types, and climatic conditions. Using recently available 5-m resolution topographical data, we located all the eruptive centers, studied their spatial distribution and analyzed scoria cone shapes in detail, calculating morphometric parameters for the best preserved. We then applied a set of statistical tools to analyze and compare the patterns of vent distribution, vent alignment, and diversity in cone shapes in these two fields. We observe that, despite their distinct setting, the two fields are similar in terms of vent distribution and cone morphology, which shows that this type of data cannot be used alone to infer the tectonic, magmatic, and climatic context of monogenetic fields. It also confirms previous results that the diversity in cone shapes (slope, height-to-diameter ratio) reflects processes that are common to all cones (e.g., ballistic emplacement followed by scoria avalanching on slopes), and hence do not vary significantly (at field-scale) with external parameters. Differences in the crustal stress regime had no apparent impact on vent distribution as the dikes followed active faults, irrespective of their motion. Climatic differences did not affect the shape variety of the studied cones probably because of their young ages (< 50,000 years old) and their location in a vegetated environment. The fields nevertheless differ in size and vent density, as well as scoria cone shape complexity and volume, which can be attributed to differences in the geometry of the magma source for its impact on the closeness of the dikes feeding the activity. Differences in the relative proportion of small cones in both fields are likely due to factors impacting eruptive style such as magma-water interaction, magma composition, and/or fissure lengths.

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Section: Magma Source Geometrymentioning

confidence: 65%

“…1). Although there have been debates, most data support that both fields are related to the subduction of the Cocos plate, albeit with differences in the geometry of the slab and in the crustal stress field and associated structures (e.g., Pardo and Suárez 1995;Pérez-Campos et al 2008;Ferrari et al 2012;Calò 2021).…”

Section: Introductionmentioning

confidence: 99%

Monogenetic volcanism in subduction settings: comparative statistical study of the Sierra Chichinautzin and Los Tuxtlas Volcanic Fields in Mexico

et al. 2023

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“…The country is situated on the North American tectonic plate, however, the complex interaction pattern with other several plates significantly affect its tectonic setting (ORTEGA-GUTIÉRREZ; GÓMEZ-TUENA, 2018). Thus, the Pacific Plate slides along the North American Plate (NAP) in NW direction while the Cocos plate subducts under NAP (CALÒ, 2021). The NAP experiences the oblique collision and underthrusting with the Caribbean Plate (RODRÍGUEZ-ZURRUNERO et al, 2019;LEMENKOVA, 2020a;SPIKINGS et al, 2015).…”

Section: Geologic Setting Of Mexicomentioning

confidence: 99%

Análise qualitativa de anomalias geofísicas e sismicidade no México: um mapeamento integrado por GMT

Lemenkova

2022

Bol. Geogr.

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Dados geofísicos de fontes abertas são amplamente usados como suporte de análise integrada em estudos geológicos regionais em áreas sismicamente ativas, como o México. Alta sismicidade com terremotos repetitivos ocorre em áreas das zonas de subducção formadas durante a evolução tectônica e se correlaciona com campos anômalos geofísicos. Este artigo investiga a correspondência entre o cenário geofísico, topográfico e sísmico do México usando o conjunto de ferramentas de script Generic Mapping Tools (GMT) para processamento de dados. A abordagem para mapeamento automatizado usando o GMT e scripts de shell é apresentada como um método cartográfico avançado com o objetivo de obter insights sobre a geologia e a geofísica do México. Os dados foram obtidos de conjuntos de dados de alta resolução de código aberto: GEBCO, EGM-2008, gravidade derivada de satélite, anomalia magnética EMAG2 e banco de dados sísmico IRIS. A correspondência entre os dados geológicos e geofísicos do México foi verificada através da comparação entre os mapas temáticos, distribuição regional de anomalias gravitacionais e localizações de terremotos. Sete novos mapas são realizados em dados geológicos, geofísicos, topográficos e sísmicos. O mapeamento sísmico é apresentado para o período de 2007-2021 demonstrando eventos com magnitude de 1,5 a 7,2. O impacto dos processos tectônicos que formaram a trincheira da América Central e o cinturão vulcânico transmexicano ativo na alta sismicidade regional com terremotos intensos é explorado. O estudo concluiu que o GMT é uma ferramenta eficaz para mapeamento e análise cartográfica de alta qualidade. Os dados IRIS podem ser usados para análises geológicas do México.

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“…It continues subducting at roughly the same angle throughout Central America (Figure 3). Some authors (e.g., Pérez-Campos et al, 2008;Dougherty and Clayton, 2014;Castellanos et al, 2018;Carciumaru et al, 2020;Calò, 2021) proposed a tear, and not a smooth bending transition, from shallow to deep subduction, but so far there is no conclusive evidence supporting either a smooth transition or a tear.…”

Section: The Subducted Cocos Platementioning

confidence: 99%

The triple junction of the North America, Cocos, and Caribbean plates. What we know, what we don’t

Guzmán-Speziale¹

2022

revmexcg

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We present a summary of the tectonic elements of the North America-Caribbean-Cocos triple junction area. In the vicinity of the triple junction, displacement related to the North America-Caribbean plate boundary takes place along the left-lateral Motagua-Polochic fault system, and convergence between the Cocos and the other two plates occurs along the Middle America trench. The trace of the Motagua-Polochic system is lost at its westernmost end and does not reach the convergent boundary. Deformation of the plate boundary in this location is then distributed along a system of reverse faults (the Reverse-faults tectonic province), a system of left-lateral faults (Strike-slip faults province), two or more large NW-SE oriented left-lateral faults (Angostura and Concordia faults), and a left-lateral fault (Tonalá) that might be construed as the continuation of the Polochic fault along the southern border of the Chiapas Massif. Somewhere within this deformation zone, transition in overriding plate between North America and Caribbean takes place, but it is not clear exactly where. It is probably at about longitude 96° W because both the dip and the shape of the subducted Cocos slab change significantly at this longitude.

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Tears, windows, and signature of transform margins on slabs. Images of the Cocos plate fragmentation beneath the Tehuantepec isthmus (Mexico) using Enhanced Seismic Models

Cited by 19 publications

References 42 publications

Monogenetic volcanism in subduction settings: comparative statistical study of the Sierra Chichinautzin and Los Tuxtlas Volcanic Fields in Mexico

Monogenetic volcanism in subduction settings: comparative statistical study of the Sierra Chichinautzin and Los Tuxtlas Volcanic Fields in Mexico

Análise qualitativa de anomalias geofísicas e sismicidade no México: um mapeamento integrado por GMT

The triple junction of the North America, Cocos, and Caribbean plates. What we know, what we don’t

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