The role of sub-continental mantle as both “sink” and “source” in deep Earth volatile cycles

Gibson, S. A.; Rooks, Eve; Day, Jason; Petrone, Chiara Maria; Leat, P. T.

doi:10.1016/j.gca.2020.02.018

Cited by 24 publications

(9 citation statements)

References 122 publications

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“…Regarding melt generation, the conclusion based on a large number of studies analyzing extensive geochemical data sets for major CFBs, seismic imaging, plate reconstruction models, and geodynamic models is that CFB melts are derived from three potential sources: partial melting of hot mantle plume heads (e.g., Gibson, 2002; Jennings et al., 2019, and references therein; Lassiter & DePaolo, 1997; Mahoney, 1988; Richards et al., 1989; G. Sen & Chandrasekharam, 2011; Sobolev et al., 2011; R. White & McKenzie, 1995), melting of the overlying metasomatized lithospheric mantle material due to the plume thermal anomaly (Arndt & Christensen, 1992; Black & Gibson, 2019; Gibson et al., 2020, and references therein; Lightfoot & Hawkesworth, 1988; Lightfoot et al., 1993; J. S. Marsh, 1987; Mckenzie & Bickle, 1988; Natali et al., 2017; Turner & Hawkesworth, 1995), and other crustal‐asthenospheric melting processes (e.g., Arndt, 1989; Kempton & Harmon, 1992; Lassiter & DePaolo, 1997; J. S. Marsh, 1989; Sheth, 2005). Of these, the plume head model is by far the most widely accepted.…”

Section: Proposed Models For Cfb Magmatic Architecturementioning

confidence: 99%

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

2021

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Section: Proposed Models For Cfb Magmatic Architecturementioning

confidence: 99%

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

2021

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“…The frequent presence of mantle composition sulphides, as well as carbonatitic and hydrous assemblages in the Seiland Igneous Province lower crustal ultramafic intrusions also support the presence of a significant volatile flux into the system throughout the CFB eruptive episode (Larsen et al., 2018). Additionally, the metasomatized mantle lithosphere may also contribute significant C to the parental melt reaching the crustal system (e.g., Black & Gibson, 2019; Gibson et al., 2020). Based on these results, we assume a higher mantle volatile composition than Black and Manga (2017) with a conservative value of 750 ppm CO 2 , and 0.23 wt % H 2 O.…”

Section: Magmatic System Modelmentioning

confidence: 99%

The Magmatic Architecture of Continental Flood Basalts: 2. A New Conceptual Model

Mittal

Richards

2021

JGR Solid Earth

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Continental flood basalts intruded and erupted millions of km3 of magma over ∼1–5 Ma. Previous work proposed the presence of large (>105 $ > {\mathrm{10}}^{5}$–106 km3) crustal magma reservoirs to feed these eruptions. However, in Paper I, we illustrated that this model is inconsistent with observations, by combining eruptive rate constraints with geochemical and geophysical observations from the Deccan Traps and other Continental flood basalt provinces (CFBs). Here, we use a new mechanical magma reservoir model to calculate the variation of eruptive fluxes (km3/year) and volumes for different magmatic architectures. We find that a single magma reservoir cannot explain the eruptive rate and duration constraints for CFBs. Using a 1D thermal model and characteristic timescales for magma reservoirs, we conclude that CFB eruptions were likely fed by a number of interconnected small‐medium (∼102–103 km3) magma reservoirs. It is unlikely that each individual magma reservoir participated in every eruption, thus permitting the occasional formation of large xenocrysts (e.g., megacrystic plagioclase). This magmatic architecture permits (a) large volume eruptive episodes with 10–100s of years duration, and (b) relatively short time‐periods separating eruptive episodes (1000s of years) since multiple mechanisms can trigger eruptions (via magma recharge or volatile exsolution, as opposed to long term (105–106 year) accumulation of buoyancy overpressure), and (c) lack of large upper‐crustal intrusive bodies in various geophysical datasets. Our new proposed magmatic architecture has significant implications for the tempo of CFB volatile release (CO2 and SO2), potentially helping explain the pre‐K‐Pg warming associated with Deccan Traps.

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“…The Aldan shield forms part of the global inventory of severely disturbed cratonic lithosphere with reduced depths to the lithosphere–asthenosphere boundary relative to the intact Siberian craton interior (Aulbach, 2018 and references therein). The emplacement of volatiles in such a disturbed lithosphere mightform an important part of Earth's volatile cycles (Gibson et al , 2020). The Chompolo assemblages feature volatile-enriched minerals that are not common in pyropes derived from the inner parts of the Siberian craton (Rezvukhin et al , 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Ionov et al , 2005; Khomich et al , 2015). On a global scale, our data might have implications for metal transfer and ore-forming processes in craton–margin settings affected by subduction (Holwell et al , 2019), and for the role of the continental lithosphere in Earth's volatile cycle (Gibson et al , 2020).…”

Section: Introductionmentioning

confidence: 90%

Cr-pyrope xenocrysts with oxide mineral inclusions from the Chompolo lamprophyres (Aldan shield): Insights into mantle processes beneath the southeastern Siberian craton

Rezvukhin

Николенко²,

Sharygin

et al. 2022

MinMag

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Pyrope xenocrysts (N = 52) with associated inclusions of Ti-and/or Cr-rich oxide minerals from the Aldanskaya dyke and Ogonek diatreme (Chompolo field, southeastern Siberian craton) have been investigated. The majority of xenocrysts are of lherzolitic paragenesis and have concave-upwards (normal) REE N patterns with increase in concentration from LREE to M-HREE (Group 1). Four Ca-rich (5.7-7.4 wt.% CaO) pyropes are extremely low in Ti, Na, Y and have sinusoidal REE N spectra, thus exhibiting distinct geochemical signatures (Group 2). A peculiar xenocryst s165 is the only sample to show harzburgitic derivation, whilst demonstrating normal to weakly sinusoidal REE N pattern and the highest Zr (93 ppm) and Sc (471 ppm). Chromite-magnesiochromite, rutile, Mg-ilmenite, and crichtonite-group minerals comprise a suite of oxide mineral inclusions in the pyrope xenocrysts. These minerals are characteristically enriched in Cr with 0.6-7.2 wt.% Cr 2 O 3 in rutile, 0.7-3.6 wt.% in Mg-ilmenite and 7.1-18.0 wt.% in the crichtonite-group minerals. The LILE-enriched complex titanates of the crichtonite group are high in Al 2 O 3 (0.9-2.2 wt.%), ZrO 2 (1.5-5.4 wt.%) and comprise a trend of compositions from the Ca-Sr-specific varieties to the Ba-dominant species (e.g. lindsleyite). In the studied pyrope xenocrysts the oxides coexist with silicates (clino-and orthopyroxene, olivine), hydrous silicates (talc, phlogopite, amphibole), carbonate (magnesite), sulfides (pentlandite, chalcopyrite, breakdown products of monosulfide and bornite solid solutions), apatite and graphite. P-T estimates imply the inclusion-bearing pyrope xenocrysts to have been derived from low-T peridotite assemblages that resided at ~600-800 °C and a pressure range of ~25-35 kbar in the graphite stability field. The pyrope genesis is linked to the metasomatic enrichment of peridotite protoliths by Ca-Zr-LILE-bearing percolating fluid-melt phases containing significant volatile components. These metasomatic agents are likely volatile-rich melts or supercritical C-O-H-S fluids that were released from a Paleo-subduction slab.

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The role of sub-continental mantle as both “sink” and “source” in deep Earth volatile cycles

Cited by 24 publications

References 122 publications

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

The Magmatic Architecture of Continental Flood Basalts: 2. A New Conceptual Model

Cr-pyrope xenocrysts with oxide mineral inclusions from the Chompolo lamprophyres (Aldan shield): Insights into mantle processes beneath the southeastern Siberian craton

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