Mantle sources and melting processes beneath East Antarctica: geochemical and isotopic (Sr, Nd, Pb, O) characteristics of alkaline and tholeiite basalt from the Earth’s southernmost (87° S) volcanoes

Panter, K. S.; Li, Y.; Smellie, John L.; Blusztajn, Jerzy; Reindel, Jenna; Odegaard, K.; Spicuzza, M.; Hart, Stanley R.

doi:10.1007/s00410-022-01914-9

Cited by 8 publications

(2 citation statements)

References 136 publications

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“…Metasomatic and mineralogical density instabilities in the SCLM can cause bodies of lithospheric material—typically tens of kilometers in thickness (Elkins‐Tanton, 2005, 2007)—to founder and/or “drip” off the base of the lithosphere into the underlying asthenospheric mantle. Melts of foundered lithosphere are expected to have distinct chemical signatures (Kay & Mahlburg Kay, 1993; Panter et al., 2022; Wang & Currie, 2015), the most significant of which is a correlation between degree and depth of melting: as a drip body descends into the underlying asthenosphere, it will heat conductively, devolatilize and potentially melt (Elkins‐Tanton, 2007). An alternative mechanism for melt generation at steep topographic variations along the lithosphere‐asthenosphere boundary is that of edge‐driven convection (Jennings et al., 2023; King & Anderson, 1998; Panter et al., 2018).…”

Section: Discussionmentioning

confidence: 99%

Geochemical Constraints on the Origin of Primitive Potassic Lavas in the Eastern Virunga Volcanic Province

Pitcavage

Furman

Nelson

et al. 2023

Geochem Geophys Geosyst

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The East African Rift System (EARS) is the Earth's largest continental divergent boundary and an excellent natural laboratory for understanding magmatic processes related to crustal rifting. The EARS consists of several major segments: the Main Ethiopian Rift, the Eastern (or Kenya) Rift, the Western Rift, and the Malawi Rift (Figure 1). The Western Rift, which includes the Bufumbira volcanics studied here, is less volcanically produc-Abstract Young mafic lavas from the East African Western Rift record melting of subcontinental lithospheric mantle that was metasomatically modified by multiple tectonic events. We report new isotope data from monogenetic cinder cones near Bufumbira, Uganda, in the Virunga Volcanic Field: 87 Sr/ 86 Sr = 0.7059-0.7079,

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Section: Discussionmentioning

confidence: 99%

Geochemical Constraints on the Origin of Primitive Potassic Lavas in the Eastern Virunga Volcanic Province

Pitcavage

Furman

Nelson

et al. 2023

Geochem Geophys Geosyst

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“…However, some of the previous studies suggested that no more addition of carbonate is necessary for the mantle source of tholeiitic basalts since partial melting of carbonate‐bearing mantle source would produce silica‐undersaturated alkaline magma (e.g., Zhu et al., 2021 and references therein). Moreover, high‐degree partial melting associated with the formation of tholeiitic basalts will dilute the signal of carbonate in the mantle source (Panter et al., 2022). For example, the Zn‐Mg isotopic characteristics of tholeiitic basalts in the Emeishan LIP indicate that there was no addition of carbonate in their mantle source (Tian et al., 2017; Yang et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Wei,

Zhang,

Cheng

et al. 2024

Geochem Geophys Geosyst

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Sedimentary carbonates are known to be carried into the deep mantle by subducted slabs, and studies on mantle‐derived magmas have attempted to trace the recycled carbonate in their mantle source. However, the final depth of storage of recycled carbonate and the role of recycled carbonate in the partial melting of mantle remain controversial. Peralkaline‐carbonatite suites are considered to have been derived from a carbonated mantle source and are windows to evaluate carbon in the mantle. In this study, we report the Zn isotopic compositions of a peralkaline‐carbonatite suite from the Tarim Large Igneous Province (Tarim LIP). The peralkaline‐carbonatite suite has heavier δ66Zn than normal mantle with δ66Zn of 0.34–0.40 ‰ for nephelinite, 0.35–0.47 ‰ for aillikite, 0.51–0.55 ‰ for nepheline syenite, 0.58–0.67 ‰ for calciocarbonatite and 0.38–0.56 ‰ for magnesiocarbonatite. The heavy Zn isotopic compositions of the peralkaline‐carbonatite suite in the Wajilitag complex suggest the incorporation of recycled carbonate‐bearing materials into the deep mantle. We infer that the calciocarbonatite was produced by the initial partial melting of subducted MgSiO3/MgO + C‐bearing carbonated eclogite, whereas the magnesiocarbonatite, aillikite, and nephelinite are considered as reacted melts between carbonated eclogite‐derived melts and peridotite. The heavy Zn isotopic compositions of the nepheline syenite are attributed to fractional crystallization from nephelinite magma in the magma reservoir. Our study highlights the incorporation of carbonated eclogite as an important agent of recycled carbon in the deep mantle and interactions between carbonated eclogite‐derived melts and peridotite lead to the complex lithological heterogeneities in the peralkaline‐carbonatite suite in Tarim LIP.

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Source variations in volatile contents of Bransfield Strait back-arc and Phoenix/West Scotia mid-ocean ridge lavas, northern Antarctic Peninsula

Anderson,

Saal,

Mallick

et al. 2024

Chemical Geology

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Mantle sources and melting processes beneath East Antarctica: geochemical and isotopic (Sr, Nd, Pb, O) characteristics of alkaline and tholeiite basalt from the Earth’s southernmost (87° S) volcanoes

Cited by 8 publications

References 136 publications

Geochemical Constraints on the Origin of Primitive Potassic Lavas in the Eastern Virunga Volcanic Province

Geochemical Constraints on the Origin of Primitive Potassic Lavas in the Eastern Virunga Volcanic Province

Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Source variations in volatile contents of Bransfield Strait back-arc and Phoenix/West Scotia mid-ocean ridge lavas, northern Antarctic Peninsula

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