Fractional crystallization of garnet in alkali basalts at >1.8 GPa and implications for geochemical diversity of Large Igneous Provinces

Malcolm Hole; Jessica Pugsley; David Jolley; John Millett

doi:10.1016/j.lithos.2023.107397

Fractional crystallization of garnet in alkali basalts at >1.8 GPa and implications for geochemical diversity of Large Igneous Provinces

Malcolm Hole, Jessica Pugsley, David Jolley, John Millett

Geology and Geophysics

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Abstract

A suite of lavas from northwest Mull, British Palaeocene Igneous Province, exhibit major and trace element characteristics that are best explained by very high pressure (>1.8 GPa) crystallization of an assemblage comprising aluminous clinopyroxene (Al-Cpx) plus garnet. The resulting series of consanguineous magmas are mildly Si-undersaturated. The trace element effects of this crystallizing assemblage are manifested in increasing light rare earth element (LREE) enrichment and heavy REE (HREE) depletion with decreasing whole-rock MgO, a predictable consequence of the bulk distribution coefficient (D) of this assemblage being > > 1 for HREE but

Original language	English
Article number	107397
Journal	Lithos
Volume	460-461
Early online date	19 Oct 2023
DOIs	https://doi.org/10.1016/j.lithos.2023.107397
Publication status	Published - 1 Dec 2023

Bibliographical note

Acknowledgements
We thank Jussi Heinonen and an anonymous reviewer for a constructive and thoughtful criticism. We thank James Westland for pointing us at useful and interesting localities on the Isle of Mull. This study was part funded by a University of Aberdeen Elphinstone Scholarship to JHP.

Keywords

Garnet fractionation
Petrology
Pressure
Mull
Basalt
Petrogenesis

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Available online 19 October 2023 0024-4937/© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
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Data From Fractional crystallization of garnet in alkali basalts at >1.8 GPa and implications for geochemical diversity of Large Igneous Provinces
Hole, M. (Creator), Pugsley, J. (Creator), Jolley, D. (Creator) & Millett, J. (Creator), University of Aberdeen, Sept 2023
DOI: 10.1016/j.lithos.2023.107397, https://ars.els-cdn.com/content/image/1-s2.0-S002449372300381X-mmc1.xlsx
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Cite this

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title = "Fractional crystallization of garnet in alkali basalts at >1.8 GPa and implications for geochemical diversity of Large Igneous Provinces",

abstract = "A suite of lavas from northwest Mull, British Palaeocene Igneous Province, exhibit major and trace element characteristics that are best explained by very high pressure (>1.8 GPa) crystallization of an assemblage comprising aluminous clinopyroxene (Al-Cpx) plus garnet. The resulting series of consanguineous magmas are mildly Si-undersaturated. The trace element effects of this crystallizing assemblage are manifested in increasing light rare earth element (LREE) enrichment and heavy REE (HREE) depletion with decreasing whole-rock MgO, a predictable consequence of the bulk distribution coefficient (D) of this assemblage being > > 1 for HREE but ",

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AU - Hole, Malcolm

AU - Pugsley, Jessica

AU - Jolley, David

AU - Millett, John

N1 - Acknowledgements We thank Jussi Heinonen and an anonymous reviewer for a constructive and thoughtful criticism. We thank James Westland for pointing us at useful and interesting localities on the Isle of Mull. This study was part funded by a University of Aberdeen Elphinstone Scholarship to JHP.

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N2 - A suite of lavas from northwest Mull, British Palaeocene Igneous Province, exhibit major and trace element characteristics that are best explained by very high pressure (>1.8 GPa) crystallization of an assemblage comprising aluminous clinopyroxene (Al-Cpx) plus garnet. The resulting series of consanguineous magmas are mildly Si-undersaturated. The trace element effects of this crystallizing assemblage are manifested in increasing light rare earth element (LREE) enrichment and heavy REE (HREE) depletion with decreasing whole-rock MgO, a predictable consequence of the bulk distribution coefficient (D) of this assemblage being > > 1 for HREE but

AB - A suite of lavas from northwest Mull, British Palaeocene Igneous Province, exhibit major and trace element characteristics that are best explained by very high pressure (>1.8 GPa) crystallization of an assemblage comprising aluminous clinopyroxene (Al-Cpx) plus garnet. The resulting series of consanguineous magmas are mildly Si-undersaturated. The trace element effects of this crystallizing assemblage are manifested in increasing light rare earth element (LREE) enrichment and heavy REE (HREE) depletion with decreasing whole-rock MgO, a predictable consequence of the bulk distribution coefficient (D) of this assemblage being > > 1 for HREE but

KW - Garnet fractionation

KW - Petrology

KW - Pressure

KW - Mull

KW - Basalt

KW - Petrogenesis

U2 - 10.1016/j.lithos.2023.107397

DO - 10.1016/j.lithos.2023.107397

M3 - Article

SN - 0024-4937

VL - 460-461

JO - Lithos

JF - Lithos

M1 - 107397

ER -

Fractional crystallization of garnet in alkali basalts at >1.8 GPa and implications for geochemical diversity of Large Igneous Provinces

Abstract

Bibliographical note

Keywords

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Data From Fractional crystallization of garnet in alkali basalts at >1.8 GPa and implications for geochemical diversity of Large Igneous Provinces

Cite this

Fractional crystallization of garnet in alkali basalts at >1.8 GPa and implications for geochemical diversity of Large Igneous Provinces