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The dynamics of magma mixing in a rising magma batch
Bulletin Of Volcanology, 1989The conditions under which two magmas can become mixed within a rising magma batch are investigated by scaling analyses and fluid-dynamical experiments. The results of scaling analyses show that the fluid behaviours in a squeezed conduit are determined mainly by the dimensionless number
Takehiro Koyaguchi, Stephen Blake
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Journal of Volcanology and Geothermal Research, 1980
Abstract Linear compositional variations of calc-alkaline rocks are difficult to explain in terms of mixing of two genetically unrelated magmas. At least two processes must be involved, a deep-seated one responsible for the long-term variations between suites of rocks erupted in successive episodes and a shallow-level one by which magma columns ...
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Abstract Linear compositional variations of calc-alkaline rocks are difficult to explain in terms of mixing of two genetically unrelated magmas. At least two processes must be involved, a deep-seated one responsible for the long-term variations between suites of rocks erupted in successive episodes and a shallow-level one by which magma columns ...
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Magma mixing due to disruption of a layered magma body
Journal of Volcanology and Geothermal Research, 1989Abstract Pyroclastic eruptions provide a mechanism for the disruption of a compositionally zoned magma body and can result in the formation of homogeneous mixed magmas. The large volume (> 1200 km3) Topopah Spring ash-flow sheet, represents an eruption from a magma body that contained an abrupt compositional interface between a high-silica rhyolite ...
Timothy P. Flood +2 more
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2021
This introductory chapter provides a broad overview of magma mixing processes in the volcanic and plutonic environments. The structural, textural and geochemical evidence for magma mixing is briefly discussed, with the aim to provide a general picture about this fundamental, yet relatively poorly known, natural phenomenon.
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This introductory chapter provides a broad overview of magma mixing processes in the volcanic and plutonic environments. The structural, textural and geochemical evidence for magma mixing is briefly discussed, with the aim to provide a general picture about this fundamental, yet relatively poorly known, natural phenomenon.
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Magma mixing and convective compositional layering within the Vesuvius magma chamber
Bulletin of Volcanology, 1991The pumice-fall deposits of the last two Plinian eruptions of Vesuvius-a.d. 79 “Pompei” and 3700 b.p. “Avellino”-show a marked vertical compositional variation from white phonolite at the base to grey tephritic phonolite at the top. In both Avellino and Pompei sequences a compositional gap separates white from grey pumice.
CIVETTA, LUCIA, Galati R., Santacroce R.
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Convection and mixing in magma chambers
Earth-Science Reviews, 1986Abstract This paper reviews advances made during the last seven years in the application of fluid dynamics to problems of igneous petrology, with emphasis on the laboratory work with which the authors have been particularly involved. Attention is focused on processes in magma chambers which produce diversity in igneous rocks, such as fractional ...
J.S. Turner, I.H. Campbell
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The mixing and mingling of magmas
Endeavour, 1997Abstract Some volcanic eruptions may be triggered by the mixing and mingling of magmas. Envisioned mixing events under volcanoes comprise intertwined physical and chemical processes. Recent advances have unravelled some possible mechanisms.
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EXPERIMENTAL STUDIES OF MAGMA MIXING
International Geology Review, 1993The paper is devoted to experiments on mixing of natural melts of different compositions at 1300-1850° C and 1-12 kbars. Two series of experiments were carried out: one involving gravity-driven convective mixing and one involving diffusive mixing. The results demonstrate the effectiveness of mixing of contrasting magmas in the course of relative motion.
I. N. Bindeman, L. L. Perchuk
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Magma mixing by convective entrainment
Nature, 1996RECENT studies of volcanic eruptions have brought to light a puzzling sequence: the ejection of dense and mixed liquids followed by a larger volume of unmixed, less dense liquid1–4. Although these studies have shown that the mixing is associated with the injection of basaltic liquid into a more silicic magma chamber, a paradox remains.
Don Snyder, Stephen Tait
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Dynamics of magma mixing in partially crystallized magma chambers
2014The Tertiary Austurhorn intrusive complex in SE Iceland represents an exhumed magma chamber that has recorded an extensive history of magma mixing and mingling. The basal part of the intrusion consists predominantly of granophyres that have been intensively and repeatedly intruded by more mafic magma.
Weidendorfer, Daniel +2 more
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