Emplacement of shallow dikes and sills beneath a small basaltic volcanic center – The role of pre-existing structure (Paiute Ridge, southern Nevada, USA)

Valentine, Greg A.; Krogh, K.E.

doi:10.1016/j.epsl.2006.04.031

Cited by 170 publications

(142 citation statements)

References 45 publications

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“…Maar-diatremes that were formed by repeated discrete explosions but that preserve evidence for a component of subsidence due to magma withdrawal probably formed above shallow, relatively short-lived (decades?) magma reservoirs (sills), often within the context of a monogenetic episode (e.g., Valentine and Krogh, 2006). MFCI explosions may have occurred during "leaks" from the shallow sills, sending small, bubble-poor batches of magma upward where they were able to interact with groundwater.…”

Section: Perspectives On the Spectrum And Research Gapsmentioning

confidence: 99%

Maars to calderas: end-members on a spectrum of explosive volcanic depressions

et al. 2015

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We discuss maar-diatremes and calderas as end-members on a spectrum of negative volcanic landforms (depressions) produced by explosive eruptions (note-we focus on calderas formed during explosive eruptions, recognizing that some caldera types are not related to such activity). The former are dominated by ejection of material during numerous discrete phreatomagmatic explosions, brecciation, and subsidence of diatreme fill, while the latter are dominated by subsidence over a partly evacuated magma chamber during sustained, magmatic volatile-driven discharge. Many examples share characteristics of both, including landforms that are identified as maars but preserve deposits from non-phreatomagmatic explosive activity, and ambiguous structures that appear to be coalesced maars but that also produced sustained explosive eruptions with likely magma reservoir subsidence. A convergence of research directions on issues related to magma-water interaction and shallow reservoir mechanics is an important avenue toward developing a unified picture of the maar-diatreme-caldera spectrum.

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Section: Perspectives On the Spectrum And Research Gapsmentioning

confidence: 99%

Maars to calderas: end-members on a spectrum of explosive volcanic depressions

et al. 2015

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“…According to Valentine and 408 Krogh (2006), complex sill and dyke systems can be present beneath small volume, alkaline 409 basaltic volcanic centres with variable dyke widths of main / parent dykes (3-9 m) and dyke-410 parallel segments (few decimetres-1.2 m). The observed dyke width in Bondoró-hegy falls in 411 the range of these dyke widths, and it may represent a part of a similar dyke system.…”

mentioning

confidence: 99%

Origin and ascent history of unusually crystal-rich alkaline basaltic magmas from the western Pannonian Basin

et al. 2013

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“…Therefore, it is reasonable to admit that the dykes are actually shallow structures, and were removed by erosion along with the host granitic bodies. As an example, one may refer to the model proposed by Valentine & Krogh (2006) for shallow dykes and sills intruded in pre-existing structures beneath a basaltic volcanic centre. A more detailed and specific geophysical work should be carried out for such an investigation.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of mafic dyke swarm continuity under the Joaquina dune field with ground magnetic survey

et al. 2017

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ABSTRACT:A ground magnetic survey in a Central-East area of the Santa Catarina Island tested the continuity of the Cretaceous mafic dykes beneath the aeolic sediments of the Joaquina plain. Vertical gradient measurements taken in 1880 stations did not detect any magnetic anomaly related to subsurface dykes. Four magnetic profiles located to the north and south of the main area showed the magnetic signature of various dykes some of them already mapped (north profiles), but also some in subsurface (south profiles). These results suggest that the dykes probably were shallow and truncated, and were already eroded along with the crystalline basement.KEYWORDS: Dyke swarm; Santa Catarina Island; Geophysical mapping; Ground surveys; Magnetic methods. RESUMO: Um levantamento magnético terrestre foi realizado numa área do centro-leste da Ilha de Santa Catarina, para verificar a continuidade dos diques em subsuperfície na área das dunas da praia da Joaquina. Medidas de gradiente vertical em 1880 estações não revelaram nenhum sinal relacionado com anomalias magneticas produzidas por diques em subsuperfície. Quatro perfis localizados ao norte e sul da área principal de estudo detectaram a assinatura magnética de vários diques, alguns aflorantes (perfis-norte) mas também alguns em subsuperfície (perfis-sul). Estes resultados sugerem que os diques eram rasos e truncados e foram erodidos juntamente com o embasamento cristalino.

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Emplacement of shallow dikes and sills beneath a small basaltic volcanic center – The role of pre-existing structure (Paiute Ridge, southern Nevada, USA)

Cited by 170 publications

References 45 publications

Maars to calderas: end-members on a spectrum of explosive volcanic depressions

Maars to calderas: end-members on a spectrum of explosive volcanic depressions

Origin and ascent history of unusually crystal-rich alkaline basaltic magmas from the western Pannonian Basin

Evaluation of mafic dyke swarm continuity under the Joaquina dune field with ground magnetic survey

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