Alkalinity of ocean island lavas decoupled from enriched source components: A case study from the EM1-PREMA Tasmantid mantle plume

Ruttor, Saskia; Nebel, Oliver; Nebel-Yacobsen, Yona; Cohen, B. E.; Eggins, Stephen

doi:10.1016/j.gca.2021.09.023

Cited by 6 publications

(3 citation statements)

References 98 publications

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“…(2021) (except for the Tasmantids, which rely on new data from Ruttor et al. (2021)). Panel (a) Eleven oceanic EM hotspots linked to the southern hemisphere mantle via plume conduits have lower 143 Nd/ 144 Nd than any hotspots linked to the northern hemisphere, and the geographic distribution of these 11 hotspots defines the Dupal domain.…”

Section: Methodsmentioning

confidence: 99%

“…(We note that one oceanic hotspot, Vema, has not been geochemically characterized, thus only the 46 oceanic hotspots are geochemically characterized for 143 Nd/ 144 Nd are shown in Figure 2). With the exception of the Tasmantid hotspot, for which new low 143 Nd/ 144 Nd data have been recently presented (Ruttor et al., 2021), the geochemical data in the database is compiled in Jackson et al. (2021), together with sources of the data, and the database is not republished here.…”

Section: Methodsmentioning

confidence: 99%

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Hemispheric Geochemical Dichotomy of the Mantle Is a Legacy of Austral Supercontinent Assembly and Onset of Deep Continental Crust Subduction

Jackson

Macdonald

2022

AGU Advances

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Ocean island basalts (OIB) erupted at hotspots, like Hawaii, reveal the presence of both primordial (Mukhopadhyay & Parai, 2019) domains and the influence of ancient subducted continental and oceanic crust -which generate EM (enriched mantle) and HIMU (high-μ, where μ = 238 U/ 204 Pb) geochemical reservoirs, respectively-in the deep mantle (Hofmann, 1997;White, 2015). Early work demonstrated that the distribution of compositional domains in the mantle is not random (Dupré & Allègre, 1983;Hedge, 1978). Hart (1984) then showed that a suite of hotspots located primarily in the southern hemisphere exhibit enriched mantle (EM) signatures, including anomalously high 87 Sr/ 86 Sr, that are largely absent in northern hemisphere hotspots. Using radiogenic isotopes, he suggested the presence of a large-scale EM reservoir centered in the southern hemispheric mantle beneath the Atlantic, Pacific and Indian oceans that supplies southern hemisphere hotspots. Called the Dupal (Dupré + Allègre) anomaly (Dupré & Allègre, 1983;Hart, 1984), this southern hemispheric feature is the most geographically widespread geochemical domain in

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Hemispheric Geochemical Dichotomy of the Mantle Is a Legacy of Austral Supercontinent Assembly and Onset of Deep Continental Crust Subduction

Jackson

Macdonald

2022

AGU Advances

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“…Hafnium exhibits much greater variation and appears decoupled from Nd-isotopes. 208,207,206 Pb/ 204 Pb isotopes are slightly enriched, overlapping with the nearby Taupo Seamount of the Tasmantids [3] .…”

mentioning

confidence: 92%