A fundamental dispute: A discussion of “On some fundamentals of igneous petrology” by Bruce D. Marsh, Contributions to Mineralogy and Petrology (2013) 166: 665–690

Latypov, Rais; Morse, Tony; Robins, Brian; Wilson, R. E.; Cawthorn, Grant; Tegner, Christian; Holness, Marian B.; Lesher, Charles E.; Barnes, Stephen J.; O’Driscoll, Brian; Veksler, Ilya V.; Higgins, Michael D.; Wilson, A. H.; Namur, Olivier; Chistyakova, Sofya; Naslund, Richard; Thy, P.

doi:10.1007/s00410-015-1108-9

Cited by 32 publications

(2 citation statements)

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“…Yet another dogma to be reassessed is that, with progressive cooling, basal solidification fronts in magma chambers invariably propagate unidirectionally upwards until the chamber is completely solidified 5 , 6 , 8 , 13 , 17 , 18 , 25 , 26 , 34 , 57 , 59 , 62 . This postulate is invalid for the undercut-embayed floor (Figs.…”

Section: Chemical Patterns In Massive Magnetititementioning

confidence: 99%

Magmatic karst reveals dynamics of crystallization and differentiation in basaltic magma chambers

Kruger

Latypov

2021

Sci Rep

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An understanding of magma chamber dynamics relies on answering three important yet highly controversial questions: where, why, and how magma chambers crystallize and differentiate. Here we report on a new natural phenomenon—the undercut-embayed chamber floor in the Bushveld Complex—which allows us to address these questions. The undercut-embayed floor is produced by magmatic karstification (i.e. erosion by dissolution) of the underlying cumulates by replenishing magmas that form basal flows on the chamber floor. This results in a few metres thick three-dimensional framework of spatially interconnected erosional remnants that separate the floor cumulates from the overlying resident melt. The basal flow in this environment is effectively cooled through the floor, inducing heterogeneous nucleation and in situ growth against much of its three-dimensional framework. The solidification front thus propagates in multiple directions from the surfaces of erosional remnants. Fractional crystallization may occur within this environment by convective removal of a compositional boundary layer from in situ growing crystals and is remarkably efficient even in very confined spaces. We propose that the way magma crystallizes and differentiates in the undercut-embayed chamber floor is likely common for the evolution of many basaltic magma chambers.

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Section: Chemical Patterns In Massive Magnetititementioning

confidence: 99%

Magmatic karst reveals dynamics of crystallization and differentiation in basaltic magma chambers

Kruger

Latypov

2021

Sci Rep

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“…The concepts attributed to Marsh have been addressed directly (e.g. Latypov 2009;Latypov et al 2015), and in recent years the discussion has moved specifically to the rocks of the Bushveld Complex, although not so much into the literature in terms of testing models as yet. Assessing the ongoing debate about the validity or relevance of the in situ evolution versus transported phenocrysts concepts to the origins of layered intrusions is beyond the scope of this review, but its application to Bushveld rocks is unavoidable and represents a significant component of the current research discussion.…”

Section: Transported Metals and Slurriesmentioning

confidence: 99%

Igneous Rock Associations 23. The Bushveld Complex, South Africa: New Insights and Paradigms

Prevec

2019

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Crystal settling and convection in the Shiant Isles Main Sill

Holness

Farr

Neufeld

2017

Contrib Mineral Petrol

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clusters of olivine are present at the roof, forming a foreshortened mirror image of the coarsening-upwards component of the floor accumulation. The coarsening-upwards sequence records the growth of olivine crystals while in suspension in a convecting magma, and their aggregation into clusters, followed by settling over a prolonged period (with limited trapping at the roof). As olivine was progressively lost from the convecting magma, crystal accumulation on the (contemporaneous) floor of the PCU was increasingly dominated by plagioclase, most likely forming clusters and aggregates with augite and olivine, both of which form large poikilitic grains in the crinanite. While the PCU is unusual in being underlain by an earlier, still hot, intrusion that would have enhanced any driving force for convection, we conclude from comparison with microstructures in other sills that convection is likely in tabular bodies >100 m thickness.

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A fundamental dispute: A discussion of “On some fundamentals of igneous petrology” by Bruce D. Marsh, Contributions to Mineralogy and Petrology (2013) 166: 665–690

Cited by 32 publications

References 65 publications

Magmatic karst reveals dynamics of crystallization and differentiation in basaltic magma chambers

Magmatic karst reveals dynamics of crystallization and differentiation in basaltic magma chambers

Igneous Rock Associations 23. The Bushveld Complex, South Africa: New Insights and Paradigms

Crystal settling and convection in the Shiant Isles Main Sill

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