Magnetic Anomalies on the Argentine Continental Shelf

Ghidella, Marta E.; Paterlini, C. Marcelo; Kovacs, L. C.; Rodriguez, G. A.

doi:10.3997/2214-4609-pdb.313.87

Cited by 10 publications

(11 citation statements)

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“…1) extends south of the Colorado River outlet into the Atlantic Ocean, and its offshore continuation along the Colorado fracture zone, as a prolongation of the Huincul High. This definition is based on the conclusions of Ghidella et al . (1995), Ramos (1999), Ramos, Riccardi & Rolleri (2004), Franke et al .…”

Section: The Argentine and The Patagonian Continental Marginsmentioning

confidence: 99%

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Geological aspects and evolution of the Patagonian continental margin

Cavallotto¹,

Violante²,

Hernández-Molina³

2011

Biological Journal of the Linnean Society

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The Patagonian continental margin records some of the tectonic, sedimentary, climatic, and oceanographic events that participated in the evolution of the Patagonian and south-western Atlantic regions. Those records are essential for fully understanding the geology and biodiversity of Patagonia. Regional geotectonic and morphosedimentary features are characterized by different types of continental margins (passive, transcurrent, and transpressive). In each of them the constituent features (shelf, slope, and rise) acquire particular morphological and sedimentary configurations. Characteristics of the sedimentary sequences and the limiting discontinuities document the different evolutive stages of the margin and intervening major processes. The regional tectonic, palaeoclimatic, and palaeoceanographic events that occurred after the break-up of Gondwana until the Quaternary, which conditioned the morphosedimentary characteristics, are analysed and described here. It is concluded that the region evolved in three major stages, according to the predominance of different factors: (1) a stage dominated by endogene factors, which occurred in Mesozoic times, when the major processes at work were plate tectonics and oceanic opening; (2) a transitional stage, which occurred in the lower Tertiary, when the proto-Atlantic Ocean evolved towards an open sea, and climatic and oceanographic factors became at least as important as tectonic factors; and (3) a stage dominated by exogene factors, which occurred in post-Oligocene times, when the Atlantic Ocean was definitively installed and the circulation of oceanic currents influenced the characteristics of the sedimentary environmentsthis stage ended in the Quaternary when glacioeustatic fluctuations imprinted the present morphosedimentary configuration. Continental Patagónico guarda gran parte de los registros de eventos tectónicos, sedimentarios, climáticos y oceanográficos que participaron en la evolución de la región Patagónica y del Atlántico Suroccidental. Su conocimiento es esencial para comprender cabalmente la geología y biodiversidad de Patagonia. Los rasgos geotectónicos y morfosedimentarios regionales se caracterizan por diferentes tipos de márgenes continentales (pasivo, transcurrente y transpresivo), en cada uno los cuales sus elementos constituyentes, la plataforma, el talud y la emersión, adquieren configuraciones morfológicas y sedimentarias particulares. Las características de las secuencias estratigráficas y sus discontinuidades documentan las distintas etapas de evolución del margen y los procesos mayores intervinientes. Se analizan y describen los eventos tectónicos, palaeoclimáticos y palaeoceanográficos de extensión regional que caracterizaron a la región desde la apertura de Gondwana hasta el Cuaternario y condicionaron sus aspectos morfosedimentarios. Se concluye que la región evolucionó en tres etapas mayores de acuerdo al predominio de diferentes factores: 1) etapa dominada por factores endógenos, ocurrida en tiempos Mesozoicos, cuando los procesos mayores ...

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Section: The Argentine and The Patagonian Continental Marginsmentioning

confidence: 99%

“…3). The Colorado transference zone, identified by magnetic (Ghidella et al ., 1995) and seismic (Franke et al ., 2007) data, is considered to be the northern limit of the ‘Patagonian shelf domain’ (Max et al ., 1999; Ramos et al ., 2004).…”

Section: Types Of Margins In the Acmmentioning

confidence: 99%

Geological aspects and evolution of the Patagonian continental margin

Cavallotto¹,

Violante²,

Hernández-Molina³

2011

Biological Journal of the Linnean Society

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“…A major magnetic boundary, the Colorado Discontinuity, was interpreted by Ghidella et al (1995) to characterize the transition from a zone of relative magnetic quiescence and low values to the SW of the Colorado transfer system to a zone of high values dominated by a pattern of short‐wavelength anomalies to the NE of the fracture zone (Fig. 2d).…”

Section: Margin Settingmentioning

confidence: 99%

Crustal-scale architecture and segmentation of the Argentine margin and its conjugate off South Africa

Blaich¹,

Faleide²,

Tsikalas³

et al. 2009

Geophysical Journal International

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S U M M A R YIntegration of regional seismic reflection and refraction profiles and potential field data across the Argentine margin and its conjugate off South Africa, complemented by crustal-scale gravity modelling, is used to reveal and illustrate the whole-crust architecture, onshore-offshore crustal structure correlations, the character of the continent-ocean boundary/transition and the relationship of crustal structure to regional variation of potential field anomalies. The study reveals, within these two provinces, distinct along-margin structural and magmatic changes that are spatially related to a number of conjugate transfer systems governing the margin segmentation and evolution, clearly implying structural inheritance. In particular, the Colorado transfer system on the Argentina margin, marks a distinct along-margin boundary in the distribution and volume of breakup-related magmatism. Similarly, the Hope transfer system on the conjugate South Africa margin also marks a distinct along-margin transition from a zone of relative magnetic quiescence to a zone of prominent magnetic anomalies. Furthermore, the study indicates that the 'G-magnetic anomaly' along the South Africa margin probably defines the eastern limit of the continent-ocean transition (COT) rather than a discrete continentocean boundary (COB). Potential field plate reconstructions of the South Atlantic suggest conjugate margin asymmetry, characterized by a rather broad Argentine margin conjugate to a narrow South Africa margin. In detail, the Argentine margin is characterized by a sharp and relatively constant COT, whereas the COT along the conjugate South Africa margin is considerably wider. An along-strike tectonomagmatic asymmetry variation is also observed and is expressed by the northward increase in width of the COT on the South African margin. The study clearly shows that integration of regional seismic reflection and refraction profiles, potential field data and gravity modelling provide a powerful resource for testing and validating alternative seismic profile structural interpretations and plate tectonic reconstructions, as well as geodynamic models for lithospheric breakup and early drift.

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“…El estudio de la litosfera en el MCA, en cuanto a su geometría y estructuras tectónicas, ha sido el objetivo de diferentes trabajos, entre los que podemos citar los estudios sísmicos que aportan zonas estructurales regionales (Hinz et al, 1999), segmentación del margen (Franke et al, 2007), profundidad del basamento y espesores sedimentarios (Figuras 3 y 4) (Pizarro et al, 2016;Pizarro, 2020), límite de las cortezas continental-oceánica (Arecco et al, 2016a(Arecco et al, , 2016b(Arecco et al, , 2018(Arecco et al, y 2023Arecco, 2018), profundidad de la discontinuidad corteza-manto superior (Figura 5) (Pizarro et al, 2012;Arecco et al, 2016b;Pizarro, 2020), interpretaciones de anomalías magnéticas en el margen argentino (Ghidella et al, 1995(Ghidella et al, y 2017Arecco et al, 2018), profundidad del punto de Curie (Figura 6) y flujo térmico (Pizarro et al, 2020;Pizarro, 2020).…”

Section: Antecedentesunclassified

Estudio litosférico del Margen Continental Argentino: comportamiento isostático y derivaciones tectónicas

Pizarro,

Ruiz,

Arecco

et al. 2023

revmexcg

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El presente trabajo es un estudio de la litosfera continental y oceánica en el Margen Continental Argentino. Estas investigaciones están basadas en datos geofísicos existentes en la zona correspondiente a la plataforma, talud, emersión y llanura abisal de Argentina, comprendida entre los 50° a 66° de longitud oeste y 36° a 50° de latitud sur. El mismo consiste en la obtención de un modelo de compensación isostática de la zona y su correlación con modelos existentes. Con el doble objetivo de evaluar el comportamiento isostático de la región y buscar mecanismos que permitan explicar su desarrollo, se consideran modelos de compensación local (mecanismo de Airy) y compensación regional (mecanismo Flexural). Siendo correlacionados con los modelos de a) Profundidad del Basamento y Espesores Sedimentarios, b) Profundidad de la Discontinuidad corteza-manto superior y c) Profundidad del Punto de Curie (CPD, Curie Point Depth), para analizar el estado isostático de la zona de cuencas offshore, adelgazamiento cortical y niveles astenosféricos, entre otras cosas. El análisis comparativo de estos elementos permite determinar el grado de compensación isostática de esta zona, la geometría de las cuencas offshore en su relación con el adelgazamiento cortical y ascenso astenosférico, ubicar los sectores donde el manto superior estaría magnetizado, modelar la asimetría lístrica de la cuenca del Colorado, determinar por primera vez los límites y geometría de los altos estructurales de Belén y San Javier y discutir las causas que dan origen a la gran profundidad del basamento en la Cuenca Argentina, entre otras como zonas de sepentinización y la zona de falla de transformación de Belén. De la misma manera se abren interrogantes que requieren nuevos análisis y estudios, como los relacionados al CPD en las cuencas de Valdés, sectorizar la zona modelada para buscar un mejor ajuste de densidades, profundizar las causas de la gran batimetría de la Cuenca Argentina, entre otros.

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Magnetic Anomalies on the Argentine Continental Shelf

Cited by 10 publications

References 0 publications

Geological aspects and evolution of the Patagonian continental margin

Geological aspects and evolution of the Patagonian continental margin

Crustal-scale architecture and segmentation of the Argentine margin and its conjugate off South Africa

Estudio litosférico del Margen Continental Argentino: comportamiento isostático y derivaciones tectónicas

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