Isotopic hyperbolas constrain sources and processes under the Lesser Antilles arc

Labanieh, S.; Chauvel, Catherine; Germa, A.; Quidelleur, Xavier; Lewin, É.

doi:10.1016/j.epsl.2010.07.018

Cited by 73 publications

(123 citation statements)

References 66 publications

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“…However, the analyzed lava samples are all fresh [loss on ignition (LOI) < 2% with one exception; Table S2], and most erupted above sea level (4,5). A previous Li isotopic study on the same suite of samples has shown that only the three samples that erupted as submarine lava have high δ 7 Li due to interaction with isotopically heavy seawater (8).…”

Section: Significancementioning

confidence: 99%

“…1). Geochemical and Sr, Nd, Pb, Hf, and Li isotopic studies suggest that the Lesser Antilles arc lavas incorporated a variable but to some extent significant amount of subducted sediments (4)(5)(6)(7)(8). However, the exact mechanism by which the sediment was incorporated into the lavas is still highly debated and involves various processes such as crustal contamination, subarc mantle metasomatism by fluids released from the slab, or melts derived by partial melting of the subducted sediments (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17).…”

mentioning

confidence: 99%

“…The lava samples are from the Martinique Island and cover most of the chemical and isotopic variations in the Lesser Antilles arc (4,5) (Fig. 1).…”

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confidence: 99%

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Magnesium isotope geochemistry in arc volcanism

Teng

Chauvel

2016

Proc. Natl. Acad. Sci. U.S.A.

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Incorporation of subducted slab in arc volcanism plays an important role in producing the geochemical and isotopic variations in arc lavas. The mechanism and process by which the slab materials are incorporated, however, are still uncertain. Here, we report, to our knowledge, the first set of Mg isotopic data for a suite of arc lava samples from Martinique Island in the Lesser Antilles arc, which displays one of the most extreme geochemical and isotopic ranges, although the origin of this variability is still highly debated. We find the δ 26 Mg of the Martinique Island lavas varies from −0.25 to −0.10, in contrast to the narrow range that characterizes the mantle (−0.25 ± 0.04, 2 SD). These high δ 26 Mg values suggest the incorporation of isotopically heavy Mg from the subducted slab. The large contrast in MgO content between peridotite, basalt, and sediment makes direct mixing between sediment and peridotite, or assimilation by arc crust sediment, unlikely to be the main mechanism to modify Mg isotopes. Instead, the heavy Mg isotopic signature of the Martinique arc lavas requires that the overall composition of the mantle wedge is buffered and modified by the preferential addition of heavy Mg isotopes from fluids released from the altered subducted slab during fluid−mantle interaction. This, in turn, suggests transfer of a large amount of fluidmobile elements from the subducting slab to the mantle wedge and makes Mg isotopes an excellent tracer of deep fluid migration. magnesium isotopes | arc magmatism | mantle wedge | Lesser Antilles arc | Martinique Island

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Section: Significancementioning

confidence: 99%

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confidence: 99%

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Magnesium isotope geochemistry in arc volcanism

Teng

Chauvel

2016

Proc. Natl. Acad. Sci. U.S.A.

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“…Although debate continues about the exact mechanism of incompatible element enrichment (Nichols et al, 1994;Tollstrup and Gill, 2005), it seems that subducted sediments likely play a significant role because they typically have much higher concentrations of most incompatible elements than the subarc mantle (Plank and Langmuir, 1998). Indeed, numerous studies have already demonstrated the chemical and isotopic imprints of subducted sediment in arc magmas (Karig et al, 1981;White and Patchett, 1984;Hawkesworth et al, 1993;Rea and Ruff, 1996); studies from the Banda and Lesser Antilles arc (Vroon et al, 1995;Carpentier et al, 2009;Labanieh et al, 2010), the Sunda arc in Indonesia (Handley et al, 2007(Handley et al, , 2014, and the Luzon arc lavas (Marini et al, 2005) being good examples.…”

Section: Introductionmentioning

confidence: 99%

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Guo

et al. 2016

Lithos

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“…5.23) shows tight clusters for all the volcano groups. Aqueous fluids will transport Ba, whereas Th is largely mobilized through sediment melting (Labanieh et al 2010;Plank 2005;Johnson and Plank 1999). The La/Sm value is influenced by the degree of partial melting of the mantle, fractional crystallization in the magma chamber, crustal assimilation, and by the quantity of added components from the subducted slab/sediment.…”

Section: Discussionmentioning

confidence: 99%

Copahue Volcano and Its Regional Magmatic Setting

Varekamp

Zareski

Camfield

et al. 2015

Active Volcanoes of the World

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Copahue volcano (Province of Neuquen, Argentina) has produced lavas and strombolian deposits over several 100,000s of years, building a rounded volcano with a 3 km elevation. The products are mainly basaltic andesites, with the 2000-2012 eruptive products the most mafic. The geochemistry of Copahue products is compared with those of the main Andes arc (Llaima, Callaqui, Tolhuaca), the older Caviahue volcano directly east of Copahue, and the back arc volcanics of the Loncopue graben. The Caviahue rocks resemble the main Andes arc suite, whereas the Copahue rocks are characterized by lower Fe and Ti contents and higher incompatible element concentrations. The rocks have negative Nb-Ta anomalies, modest enrichments in radiogenic Sr and Pb isotope ratios and slightly depleted Nd isotope ratios. The combined trace element and isotopic data indicate that Copahue magmas formed in a relatively dry mantle environment, with melting of a subducted sediment residue. The back arc basalts show a wide variation in isotopic composition, have similar water contents as the Copahue magmas and show evidence for a subducted sedimentary component in their source regions. The low 206 Pb/ 204 Pb of some backarc lava flows suggests the presence of a second endmember with an EM1 flavor in its source. The overall magma genesis is explained within the context of a subducted slab with sediment that gradually looses water, water-mobile elements, and then switches to sediment melt extracts deeper down in the subduction zone. With the change in element extraction mechanism with depth comes a depletion and fractionation of the subducted

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Isotopic hyperbolas constrain sources and processes under the Lesser Antilles arc

Cited by 73 publications

References 66 publications

Magnesium isotope geochemistry in arc volcanism

Magnesium isotope geochemistry in arc volcanism

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Copahue Volcano and Its Regional Magmatic Setting

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