Lithium isotopic composition of Central American volcanic arc lavas: implications for modification of subarc mantle by slab-derived fluids: correction

Chan, Lui-Heung; Leeman, William P.; You, Chen–Feng

doi:10.1016/s0009-2541(01)00298-4

Cited by 145 publications

(109 citation statements)

References 14 publications

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“…The lithium concentration and isotopic composition of the continental crust, as well as river waters, are well documented by various authors (17,(19)(20)(21)(22)(23)(24)(25)(26). In addition, Li concentration and isotopic composition of potential building blocks of the continental crust, namely, basaltic arc lavas (28)(29)(30)(31)(32) and Archean tonalites, trondhjemites, and granodiorites (TTG, 17, 33) are known. Collectively, these studies demonstrate that the δ 7 Li of present-day bulk continental crust is 2-3‰ lower than that of its potential building blocks (i.e., mantle-derived basalts), which likely reflects the influence of chemical weathering on the bulk crust composition (17,24).…”

Section: Lithium Isotopesmentioning

confidence: 91%

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Constraints on continental crustal mass loss via chemical weathering using lithium and its isotopes

Liu

Rudnick

2011

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

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Chemical weathering, as well as physical erosion, changes the composition and shapes the surface of the continental crust. However, the amount of continental material that has been lost over Earth’s history due to chemical weathering is poorly constrained. Using a mass balance model for lithium inputs and outputs from the continental crust, we find that the mass of continental crust that has been lost due to chemical weathering is at least 15% of the original mass of the juvenile continental crust, and may be as high as 60%, with a best estimate of approximately 45%. Our results suggest that chemical weathering and subsequent subduction of soluble elements have major impacts on both the mass and the compositional evolution of the continental crust.

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Section: Lithium Isotopesmentioning

confidence: 91%

“…The lithium concentration and isotopic composition in JCC are compiled from literature data for arc basalts (SiO 2 ¼ 45 ∼ 55% wt.) (28)(29)(30)(31)(32)34) and the GEOROC database (35). Overall, 552 Li concentrations and 75 δ 7 Li values are available, worldwide.…”

Section: Mass Balance Modelmentioning

confidence: 99%

Constraints on continental crustal mass loss via chemical weathering using lithium and its isotopes

Liu

Rudnick

2011

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

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“…The Li isotopic compositions of volcanic rocks from convergent plate boundaries differ from those of divergent boundaries (Moriguti and Nakamura, 1998a;Tomascak et al, 2000Tomascak et al, , 2002Chan et al, 2002b): the δ 7 Li values of many arc lavas range between those of fresh N-MORB glasses (ca. +3‰, and those of the subducted components (δ 7 Li < +14‰, Chan et al, 1992Chan et al, , 2002aChan and Kastner, 2000) such as altered oceanic crust and marine sediments.…”

Section: Origin Of the Himu Source LI Isotopic Fractionation During Dmentioning

confidence: 99%

“…Zack et al (2003) documented for the first time that distinct reservoirs with an isotopically light Li signature (δ 7 Li << ±0‰) exist in the Earth (Fig. 1, e.g., Chan and Edmond, 1988;Chan et al, 1992Chan et al, , 1994Chan et al, , 1999Chan et al, , 2002bYou and Chan, 1996;Huh et al, 1998Huh et al, , 2001Moriguti and Nakamura, 1998a, b;Zhang et al, 1998;Tomascak et al, 1999aTomascak et al, , 2000Tomascak et al, , 2002Chan and Kastner, 2000;James and Palmer, 2000;.…”

Section: Introductionmentioning

confidence: 99%

“…During low-temperature alteration at the seafloor, the δ 7 Li values of altered mid-ocean ridge basalts (MORBs) tend to increase with the degree of alteration, but those of (Chan et al, 1992;Moriguti and Nakamura, 1998a), arc lavas (Moriguti and Nakamura, 1998a;Tomascak et al, 2000Tomascak et al, , 2002Chan et al, 2002b), oceanic sediments (Chan et al, 1994;Zhang et al, 1998;Chan et al, 1999;Chan and Kastner, 2000), river water (Huh et al, 1998(Huh et al, , 2001, seawater (Chan and Edmond, 1988;You and Chan, 1996;Moriguti and Nakamura, 1998b;Tomascak et al, 1999a;James and Palmer, 2000;Pistiner and Henderson, 2003), mantle-derived xenolith (clinopyroxene data) (Nishio et al, 2004), eclogite (whole-rock data) (Zack et al, 2003). The data for the altered oceanic crust consist of those of low-temperature altered basalts (Chan et al, 1992(Chan et al, , 2002b, high-temperature altered basalts (Chan et al, 2002b), and serpentinized abyssal peridotite (whole-rock data) (Decitre et al, 2002). Available OIB data are limited to the Hawaiian lava data (Tomascak et al, 1999b;James and Palmer, 2000;Chan and Frey, 2003;Pistiner and Henderson, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Lithium, strontium, and neodymium isotopic compositions of oceanic island basalts in the Polynesian region: constraints on a Polynesian HIMU origin

et al. 2005

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To investigate the origin of the HIMU (high-µ) reservoir in the mantle, we measured Li, Sr, and Nd isotopic compositions of several oceanic island basalts (OIBs) from the Polynesian region. We used a recently developed multiple-collector inductively coupled plasma mass spectrometry method that allows precise and accurate Li isotopic determinations. This study presents the first Li isotopic data on HIMU OIBs. Li] L-SVEC standard -1] × 1000) of the Polynesian HIMU OIBs (Mangaia, Tubuai, and Rurutu) range from +5.0‰ to +7.4‰, which are higher than those of fresh normal mid-ocean ridge basalt (N-MORB) glasses (ca. +3‰). The simultaneously measured K/Rb, Ba/Rb, and 87 Sr/ 86 Sr ratios indicate that the analyzed HIMU OIBs are free from significant posteruption alteration. These results suggest that the δ 7 Li value of the Polynesian HIMU source is never lower than those of the N-MORBs.Among the numerous models for the origin of the HIMU source, the most widely accepted model is that it involves subducted (dehydrated) oceanic crust. For this HIMU-origin model, our new Li isotopic results exclude the highly altered portion, that is, the uppermost part of the oceanic crust, because the δ 7 Li value of subducted highly altered MORB should be extremely low (δ 7 Li < fresh MORB). For these reasons, we propose that the Polynesian HIMU source is the relatively less-altered oceanic crust underlying the highly altered crust. Whereas Pb, Sr, and Nd isotopic signatures dominantly indicate the involvement of sediments in a source, the Li isotopic signature is more sensitive to the degree of alteration experienced by the basaltic crust and thus can be used to distinguish what part of the crust was trapped in the OIB magma. It therefore provides information complementary to that provided by the radiogenic isotopes.

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Boron isotope variations in Tonga‐Kermadec‐New Zealand arc lavas: Implications for the origin of subduction components and mantle influences

Leeman

Tonarini

Turner

2017

Geochem Geophys Geosyst

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The Tonga‐Kermadec‐New Zealand volcanic arc is an end‐member of arc systems with fast subduction suggesting that the Tonga sector should have the coolest modern slab thermal structure on Earth. New data for boron concentration and isotopic composition are used to evaluate the contrasting roles of postulated subduction components (sediments and oceanic slab lithologies) in magma genesis. Major observations include: (a) Tonga‐Kermadec volcanic front lavas are enriched in B (as recorded by B/Nb and similar ratios) and most have relatively high δ11B (>+4‰), whereas basaltic lavas from New Zealand have relatively low B/Nb and δ11B (<−3.5‰); (b) both δ11B and B/Nb generally increase northward from New Zealand along with convergence rate and overall slab flux; (c) δ11B and B/Nb decrease toward the back‐arc, as observed elsewhere; and (d) low δ11B is observed in volcanic front samples from Ata, an anomalous sector where the back‐arc Valu Fa Spreading Center impinges on the arc and the Louisville Seamount Chain is presently subducting. Otherwise, volcanic front lavas exhibit positive correlations for both B/Nb and δ11B with other plausible indicators of slab‐derived fluid contributions (e.g., Ba/Nb, U/Th, (230Th/232Th) and 10Be/9Be), and with estimated degree of melting to produce the mafic lavas. Inferred B‐enrichments in the arc magma sources are likely dominated by serpentinite domains deeper within the subducting slab (±altered oceanic crust), and B systematics are consistent with dominant transport by slab‐derived aqueous fluids. Effects of this process are amplified by mantle wedge source depletion due to prior melt extraction.

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Lithium isotopic composition of Central American volcanic arc lavas: implications for modification of subarc mantle by slab-derived fluids: correction

Cited by 145 publications

References 14 publications

Constraints on continental crustal mass loss via chemical weathering using lithium and its isotopes

Constraints on continental crustal mass loss via chemical weathering using lithium and its isotopes

Lithium, strontium, and neodymium isotopic compositions of oceanic island basalts in the Polynesian region: constraints on a Polynesian HIMU origin

Boron isotope variations in Tonga‐Kermadec‐New Zealand arc lavas: Implications for the origin of subduction components and mantle influences

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