Influence of pre-salt alignments in post-Aptian magmatism in the Cabo Frio High and its surroundings, Santos and Campos basins, SE Brazil: An example of non-plume-related magmatism

Oreiro, Sérgio Goulart; Cupertino, José; Szatmári, Péter; Filho, Antônio Thomaz

doi:10.1016/j.jsames.2007.08.006

Cited by 56 publications

(32 citation statements)

References 27 publications

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“…These include the Walvis Ridge and the Rio Grande Rise, and volcanism occurs along shear, wrench and extensional deformation structures. Additinal observations in support of this are reported from seismic reflection studies of the Cabo Frio area, part of the Rio Grande Rise immediately offshore Brazil (Oreiro et al, 2005).…”

Section: The Atlantic Oceansupporting

confidence: 54%

The “plate” model for the genesis of melting anomalies

Foulger¹

2007

Special Paper 430: Plates, Plumes and Planetary Processes

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The Plate Tectonic Processes, or "Plate" model for the genesis of melting anomalies ("hot spots") attributes them to shallow-sourced phenomena related to plate tectonics. It postulates that volcanism occurs where the lithosphere is in extension, and that the volume of melt produced is related primarily to the fertility of the source material tapped. This model is supported in general by the observation that most present-day "hot spots" erupt either on or near spreading ridges or in continental rift zones and intraplate regions observed or predicted to be extending. Ocean-island-basalt-like geochemistry is evidence for source fertility at productive melting anomalies. Plate tectonics involves a rich diversity of processes, and as a result the Plate model is in harmony with many characteristics of the global melting-anomaly constellation that have tended to be underemphasized. The melting anomalies that have been classified as "hot spots" and "hot spot tracks" exhibit extreme variability. This suggests that a "one size fits all" model to explain them, such as the classical Plume model, is inappropriate, and that local context is important. Associated vertical motion may comprise precursory-, contemporaneous-or post-emplacement uplift or subsidence. The total volume erupted ranges from trivial in the case of minor seamount chains to ~ 10 8 km 3 for the proposed composite Ontong Java-Manihiki-Hikurangi Plateau. Time progressions along chains may be extremely regular or absent. Several avenues of testing of the hypothesis are underway and are stimulating an unprecedented and healthy degree of critical debate regarding the results. Determining seismologically the physical conditions beneath melting anomalies are challenging because of problems of resolution and interpretation of velocity anomalies in terms of medium properties. Petrological approaches to determining source temperature and composition are controversial and still under development. Modeling the heat budget at large igneous provinces requires knowledge of the volume and timescale of emplacement, which are often unclear. Although ocean-island-basalt-type geochemistry is generally agreed to be derived from recycled near-surface materials, the specifics are not yet agreed. Examples are discussed from the Atlantic and Pacific oceans, which show much commonality. Each ocean hosts a single, currently forming, major tholeiitic province (Iceland and Hawaii). Both of these comprise large igneous provinces that are forming late in the sequences of associated volcanism rather than at their beginnings. Each ocean contains several melting anomalies on or near spreading ridges, both time-progressive and non-time-progressive linear volcanic chains of various lengths, and regions of scattered volcanism several hundred kilometers broad. Many continental large igneous provinces lie on the edges of continents and clearly formed in association with continental breakup. Other volcanism is associated with extension in rift valleys, back-arc regions or above sites of slab-teari...

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Section: The Atlantic Oceansupporting

confidence: 54%

The “plate” model for the genesis of melting anomalies

Foulger¹

2007

Special Paper 430: Plates, Plumes and Planetary Processes

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“…Magmatism continued, albeit likely incrementally, to the late Santonian or later. Our inferred ages of igneous activity broadly coincide with a phase of widespread magmatism across the Santos and Campos basins at ~90-80 Ma [e.g., Oreiro et al, 2008]; a magmatic event at this time is supported by the high percentage of altered basalt fragments within Santonian turbidite reservoirs across the Santos Basin [e.g., Klarner et al, 2008;Mohriak, 2003]. With respect to the salt-related deformation history outlined above, Albian-to-Santonian magmatism implies intrusion occurred synchronous to gravity driven salt tectonics (Fig.…”

Section: Timing Of Igneous Activitymentioning

confidence: 69%

“…A variety of igneous events have been recognised in the Santos Basin, including Early Cretaceous pre-rift and syn-rift magmatism, pre-salt volcanism, and post-salt magmatic activity, which are mainly dated as Santonian and Eocene [e.g., Fornero et al, 2019;Oreiro et al, 2008].…”

Section: Timing Of Igneous Activitymentioning

confidence: 99%

Salt-magma interactions influence intrusion distribution and salt tectonics in the Santos Basin, offshore Brazil

Magee¹,

Pichel²,

Madden-Nadeau³

et al. 2022

Preprint

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“…The same technique was successfully used by Oreiro et al (2008) when studying the Upper Cretaceous and Paleogene magmatism at the border between Campos and Santos Basins.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the geometry of diabase sills of the Serra Geral magmatism, by 2D seismic interpretation, in Guareí region, São Paulo, Paraná basin, Brazil

Costa¹,

Santos²,

Bergamaschi³

et al. 2016

Braz. J. Geol.

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ABSTRACT:The Paraná Basin holds in its stratigraphic record a thick layer of volcanic rocks related to the opening of the Gondwana Supercontinent, which occurred during the Eocretaceous. Based on the interpretation of three two-dimensional (2D) seismic lines in the region of Guareí, East-Central São Paulo state, in the Southeast of Brazil, the subsurface geometries of these volcanic rocks were identified. Since the original seismic resolution quality was low, alternative techniques were utilized to improve the seismic imaging, such as isolating maximum and minimum amplitude values by manipulating the color scale, and using the root mean square (RMS) attribute and the Amplitude Volume technique (tecVA), which emphasize the seismic signature of igneous rocks in relation to sedimentary layers. The use of such techniques allowed the identification of different geometries of diabase sills and showed a relationship between these intrusive and organic matter maturation of the source rock. KEYWORDS:Geometry of sills; Serra Geral magmatism; Amplitude analysis. RESUMO: A Bacia do Paraná possui em seu registro estratigráfico uma espessa camada de rochas vulcânicas relacionadas à abertura do Supercontinente Gondwana, ocorrida durante o Eocretáceo. Por meio da interpretação de três linhas sísmicas em duas dimensões (2D), localizadas na região de Guareí

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Influence of pre-salt alignments in post-Aptian magmatism in the Cabo Frio High and its surroundings, Santos and Campos basins, SE Brazil: An example of non-plume-related magmatism

Cited by 56 publications

References 27 publications

The “plate” model for the genesis of melting anomalies

The “plate” model for the genesis of melting anomalies

Salt-magma interactions influence intrusion distribution and salt tectonics in the Santos Basin, offshore Brazil

Analysis of the geometry of diabase sills of the Serra Geral magmatism, by 2D seismic interpretation, in Guareí region, São Paulo, Paraná basin, Brazil

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