Editorial: Crystal Archives of Magmatic Processes

Ubide, Teresa; Neave, David A.; Petrelli, Maurizio; Longpré, Marc‐Antoine

doi:10.3389/feart.2021.749100

Cited by 13 publications

(8 citation statements)

References 61 publications

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“…(1988; Figure S20 in Supporting Information S1), except for three Fe‐ and Mg‐enriched MORB‐type outliers. Polyhedral phenocrysts from the MORB‐type dykes generally show strong sector zoning, suggesting crystallization under a thermal gradient, at low degrees of undercooling (e.g., Mollo & Hammer, 2017; Ubide, Mollo, et al., 2019; Ubide, Caulfield, et al., 2019; Ubide et al., 2021; and references therein); simple core‐rim zoning was not identified in any of the crystals investigated. Relative to prism sectors, hourglass sectors are Mg‐ and Si‐enriched (average of 11% and 4% enrichment in MORB‐type dykes, and 4% and 9% enrichment in Ribeira‐type dykes, respectively) and Ti‐, Fe‐, and Al‐depleted (64%, 70%, and 8% depletion in MORB‐type dykes, and 60%, 67%, and 5% depletion in Ribeira‐type dykes, respectively).…”

Section: Resultsmentioning

confidence: 95%

Tracking the Transition From a Gondwana LIP to the South Atlantic Ocean With Geochronological and Geochemical Indicators

et al. 2023

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The timing and mechanisms controlling the transition from large igneous provinces (LIPs) into oceanic crust during supercontinent breakup are poorly constrained. In the case of Pangea rifting and opening of the South Atlantic, the oldest seafloor magnetic anomalies usually postdate flood basalt extrusion by ∼20-30 Ma; however, geochronological evidence shows that minor mid-ocean ridge basalt (MORB)-like intrusions were almost coeval with late-stage flood basalt volcanism (e.g., Jagoutz et al., 2007;Jourdan et al., 2007). Little is known about the role and significance of this early MORB-like intrusive magmatism during rifting, and whether it marks a stepwise transition from a LIP into a passive margin, or whether it represents isolated asthenospheric upwellings still controlled by the LIP system.

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Section: Resultsmentioning

confidence: 95%

Tracking the Transition From a Gondwana LIP to the South Atlantic Ocean With Geochronological and Geochemical Indicators

et al. 2023

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“…Details of pre-eruptive magma storage, transport, and evolution are essential to reconstruct transcrustal magma plumbing systems, to reveal the histories of eruptions, and to monitor potential volcanic activities (Ganne et al 2018;Ubide et al 2019a;Magee et al 2021;Pontesilli et al 2021;Ubide et al, 2021). Previous studies have demonstrated that a basaltic magmatic system usually consists of multiple, interconnected, vertically distributed magma storage layers and reservoirs within the upper mantle and the crust, which feed small (ephemeral) magma reservoirs at shallowcrustal levels.…”

Section: Introductionmentioning

confidence: 99%

“…As one of the main components in basaltic rocks, crystals (olivine, pyroxene or plagioclase) with various origins typically record crucial information for multistep magma transport, recharge and storage within the Earth's mantle and crust (Zhang et al 2007; Ubide et al 2019aUbide et al , 2019bUbide et al , 2021Masotta et al 2020). The crystals carried by the volcanic eruptions hold clues of melt compositions and magmatic conditions, thereby providing windows into processes that are physically inaccessible yet control volcanic behavior and the evolution of magmatic systems (Ubide et al 2021;Edmonds et al 2019). Specifically, these crystal populations may be classified as orthocrysts, antecrysts, xenocrysts, or peritectic phases (Miller et al 2007;Jerram and Martin 2008;Bach et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Multiple magmatic processes revealed by distinct clinopyroxene populations in the magma plumbing system: A case study from a Miocene volcano in West Qinling, Central China

Zhang,

Li,

et al. 2024

American Mineralogist

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The application of whole rock compositions to trace magma evolution or crystal-melt equilibrium may be called into question when foreign crystals are incorporated into host magmas. To address this challenge, establishing the origins (orthocrysts, antecrysts, xenocrysts, etc.) of minerals with variable textures in magmatic plumbing systems is necessary. In this paper, we describe complex oscillatory zoning patterns of clinopyroxenes (Cpx) from the Miocene Majuangou (MJG) alkali basalts from West Qinling. Our detailed petrographic, mineralogical, and geochemical analyses unravel the origins of various Cpx crystals with distinct textural patterns, thereby providing information about magma storage, recharging and/or mixing, and transportation, as well as the reactions between crystals and melt/fluid. Based on textural patterns, Cpx may be divided into four types with normal (Type-1 Cpx), simple oscillatory (Type-2 Cpx), complex oscillatory (Type-3 Cpx), and grains that lack zoning (Type-4 Cpx, suggested to be orthocrysts). Through the textural characterization of Cpx, the comparison between different types of Cpx, and the relationships between Cpx major compositions from different lithologies, we concluded that Type 1, 2 and 3 Cpx cores are antecrysts or xenocrysts with diverse origins: primitive magma (Type-1 Cpx cores), magma mush (Type-2 Cpx cores), and crustal granulite (Type-3 Cpx cores). The zoning patterns and the compositions of these Cpx crystals indicate at least three batches of magmatic activity, i.e., the Batch-1 low-Mg# magma (Mg#: 47.4-53.3), the Batch-2 primitive This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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“…Macrocryst growth conditions are primarily controlled by pre‐eruptive variables including melt composition (X), melt water content (H 2 O), pressure (P; analogous to depth), and temperature (T), parameters which also have a remarkable effect on eruptive dynamics (Cashman & Sparks, 2013) by governing factors such as ascent rate (Cassidy et al., 2018; Gonnermann & Manga, 2007). A hallmark of magmas in a variety of geodynamic settings is that they contain macrocrysts with diverse chemistry and texture at the scale of an individual crystal, within a single sample, and between separate magmas (Cao et al., 2019; Higgins et al., 2021b; Humphreys et al., 2006; Mangler et al., 2020; Musu et al., 2023; Neave et al., 2014; Stock et al., 2020), demonstrating that macrocrysts crystallize under a range of P‐T‐X‐H 2 O conditions in space and time (Ubide et al., 2021). A detailed quantitative study of macrocrysts within and between successive volcanic eruptions is therefore essential to deconvolve the link between pre‐eruptive magma storage conditions, eruptive dynamics, and time.…”

Section: Introductionmentioning

confidence: 99%

Identifying Distinct Pre‐Eruptive Composition‐H₂O‐Time Trends Using Plagioclase

Higgins,

Sheldrake

2024

Geochem Geophys Geosyst

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Macrocrysts (large crystals) in magmas offer a premier record of pre‐eruptive magma storage conditions encoded in their chemistry and texture. Careful study of macrocryst zoning can deconvolve the conditions of crystal growth and the relative time a magma spends in a given physical‐chemical state prior to eruption. Importantly, identifying discrete macrocryst zones requires consideration of both chemistry and texture simultaneously. Here, we employ a novel image segmentation approach to characterize zoning from 2D chemical maps of plagioclase macrocrysts. We apply the method to 15 volcanic eruptions, across three stratigraphic sections, to track statistical differences in crystal zoning through relative time at an arc volcano (Mount Liamuiga, Saint Kitts). Plagioclase from the 15 eruptions are described by 7 unique textural‐chemical zoning populations, which we term “zoning groups,” each of which has a unique An# fingerprint. Two of the studied stratigraphic sections overwhelmingly record low‐An# zoning groups (ZGs), whereas the other section records mostly high‐An# ZGs, suggestive of two distinct storage conditions. Using observations from equilibrium experiments relevant to Saint Kitts bulk magma compositions, we show that differences in melt H2O are the primary drivers of the An# variability. Negative whole rock K2O versus predicted H2O trends are suggestive of ubiquitous H2O‐saturated conditions throughout the middle and upper crust, with a correlation between H2O‐saturated storage pressure (Psat) and eruptive dynamics; magmas stored in the upper‐crust (0.48 ± 0.28–1.08 ± 0.45 kbar) produce larger‐volume, pumice‐rich eruptions compared to magmas stored in the middle crust (3.29 ± 0.87–3.88 ± 1.05 kbar) which generally produce smaller‐volume, centimeter to decimeter‐thick fall deposits.

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Editorial: Crystal Archives of Magmatic Processes

Cited by 13 publications

References 61 publications

Tracking the Transition From a Gondwana LIP to the South Atlantic Ocean With Geochronological and Geochemical Indicators

Tracking the Transition From a Gondwana LIP to the South Atlantic Ocean With Geochronological and Geochemical Indicators

Multiple magmatic processes revealed by distinct clinopyroxene populations in the magma plumbing system: A case study from a Miocene volcano in West Qinling, Central China

Identifying Distinct Pre‐Eruptive Composition‐H₂O‐Time Trends Using Plagioclase

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Editorial: Crystal Archives of Magmatic Processes

Cited by 13 publications

References 61 publications

Tracking the Transition From a Gondwana LIP to the South Atlantic Ocean With Geochronological and Geochemical Indicators

Tracking the Transition From a Gondwana LIP to the South Atlantic Ocean With Geochronological and Geochemical Indicators

Multiple magmatic processes revealed by distinct clinopyroxene populations in the magma plumbing system: A case study from a Miocene volcano in West Qinling, Central China

Identifying Distinct Pre‐Eruptive Composition‐H2O‐Time Trends Using Plagioclase

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Identifying Distinct Pre‐Eruptive Composition‐H₂O‐Time Trends Using Plagioclase