Lithium isotopic composition of submarine basalts: implications for the lithium cycle in the oceans

Chan, Lui-Heung; Edmond, John M.; Thompson, Geoffrey; Gillis, K. M.

doi:10.1016/0012-821x(92)90067-6

Cited by 412 publications

(355 citation statements)

References 27 publications

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“…Lithium addition has not only been suggested for eclogites and other HP rocks, where it seems to be a common feature (Marschall et al, 2007b;Penniston-Dorland et al, 2010;Simons et al, 2010), but also in peridotites in a supra-subduction zone setting (Paquin et al, 2004), indicating a high Li mobility in deep subduction zone environments. (Chan et al, 1992;Marschall et al, 2007b). However, there is no indication of positive correlation between Li concentrations and δ 7 Li in the MORB-type eclogites, suggesting that the Li isotopic signature was acquired due to metasomatic processes during subduction (Fig.…”

Section: Morb-type Eclogites: Internal LI Metasomatism At Hp Conditionsmentioning

confidence: 96%

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A stable (Li, O) and radiogenic (Sr, Nd) isotope perspective on metasomatic processes in a subducting slab

et al. 2011

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Two distinct types of eclogites from the Raspas Complex (Ecuador), which can be distinguished based on petrography and trace element geochemistry, were analyzed for their stable (Li, O) and radiogenic (Sr, Nd) isotope signature to constrain metasomatic changes due to fluid-overprinting in metabasaltic rocks at high-pressure conditions and to identify fluid sources. MORB-type eclogites are characterized by a relative LREE depletion similar to MORB. High-pressure (HP) minerals from this type of eclogite have highly variable oxygen isotope compositions (garnet: +4.1 to +9.

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Section: Morb-type Eclogites: Internal LI Metasomatism At Hp Conditionsmentioning

confidence: 96%

“…Fresh and altered oceanic crust generally has positive δ 7 Li values (e.g. Chan et al, 1992Chan et al, , 2002, and dehydration causes only small changes in Li isotope ratios in subducting crust (Marschall et al, 2007b). A simple Rayleigh distillation model (Fig.…”

Section: Morb-type Eclogites: Internal LI Metasomatism At Hp Conditionsmentioning

confidence: 99%

A stable (Li, O) and radiogenic (Sr, Nd) isotope perspective on metasomatic processes in a subducting slab

et al. 2011

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“…In modern oceans, Li has a residence time of about 1 Myr and the principal input fluxes are continental weathering and hydrothermal activity, which are roughly equivalent (Hathorne & James, 2006;Misra & Froelich, 2012). The main sinks are secondary mineral formation during alteration of the oceanic crust and the incorporation of Li into marine sediments (Chan & Edmond, 1988;Chan et al, 2006;1992;Hathorne & James, 2006;Stoffyn-Egli & MacKenzie, 1984). The isotopic ratio of Li in modern oceans is ~31‰ (Tomascak et al, 1999).…”

Section: Weathering and The Li-isotope Composition Of The Oceansmentioning

confidence: 99%

Lithium-isotope evidence for enhanced silicate weathering during OAE 1a (Early Aptian Selli event)

Lechler

Strandmann

Jenkyns

et al. 2015

Earth and Planetary Science Letters

113

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An abrupt rise in temperature, forced by a massive input of CO 2 into the atmosphere, is commonly invoked as the main trigger for Oceanic Anoxic Events (OAEs). Global warming initiated a cascade of palaeoenvironmental perturbations starting with increased continental weathering and an accelerated hydrological cycle that delivered higher loads of nutrients to coastal areas, stimulating biological productivity.The end-result was widespread anoxia and deposition of black shales: the hallmarks of OAEs. In order to assess the role of weathering as both an OAE initiator and terminator (via CO 2 sequestration) during the Early Aptian OAE 1a (Selli Event, ~120 Ma) the isotopic ratio of lithium isotopes was analysed in three sections of shallowmarine carbonates from the Pacific and Tethyan realm and one basinal pelagic section from the Tethyan domain. Because the isotopic composition of lithium in seawater is largely controlled by continental silicate weathering and high-and lowtemperature alteration of basaltic material, a shift to lighter  7 Li values is expected to characterize OAEs. The studied sections illustrate this phenomenon:  7 Li values decrease to a minimum coincident with the negative carbon-isotope excursion that effectively records the onset of OAE 1a. A second negative  7 Li excursion occurs coeval with the minimum in strontium isotopes after the event. The striking similarity to the strontium-isotope record argues for a common driver. The formation and destruction (weathering) of an oceanic LIP could account for the parallel trend in both isotope systems. The double-spike in lithium isotopes is probably related to a change in weathering congruencies. Such a chemostratigraphy is consistent with the hypothesis that an increase in silicate weathering, in conjunction with organic-carbon burial, led to drawdown of atmospheric CO 2 during the early Aptian OAE 1a.

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“…In addition, it is well known that weathered products of the crust exhibit negative δ 7 Li values when compared to those obtained from mantle-derived magmas. Fresh peridotites and normal mid-ocean ridge basalts (N-MORB) typically fall in a relatively restricted range (δ 7 Li 3.8 ± 1.5 %), relative to the international Li standard, NIST SRM-8545 (Chan et al 1992;Elliott et al 2006;Jeffcoate et al 2007;Magna et al 2006;Seitz et al 2004;Tomascak et al 2008). Highly fractionated δ 7 Li values (−20 to +15 ‰) were measured in Jack Hills zircons by Ushikubo et al (2008); negative values are consistent with extensive weathering during the Hadean and Archean.…”

Section: Introductionmentioning

confidence: 98%

Li zoning in zircon as a potential geospeedometer and peak temperature indicator

Trail

Cherniak

Watson

et al. 2016

Contrib Mineral Petrol

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920 to 650 °C, calculated diffusivities are in agreement with a previously established Arrhenius relationship calibrated on trace-element-poor Mud Tank zircon. Our revised Arrhenius relationship that includes both datasets is:We also observed that synthetic sector-zoned zircon exhibits near-step-function Li concentration profiles across sectors that correlate with changes in the rare earth element (REE) and P concentrations. This allowed us to examine how Li diffusion might couple with REE diffusion in a manner different than that described above. In particular, re-heating these grains revealed significant Li migration, but no detectable migration of the rare earth elements. Thus, unlike most elements in zircon which are not mobile at the micrometer scale under most timetemperature paths in the crust, Li zoning, relaxation of zoning, or lack of zoning altogether could be used to reveal time-temperature information. Discrete ~10 μm concentration zones of Li within zircon may be partially preserved at 700 °C for tens to hundreds of years, and at 450 °C for millions of years. In this regard, Li zoning in zircon holds significant potential as a geospeedometer, and in some instances as a qualitative indicator of the maximum temperature experienced by the zircon.

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Lithium isotopic composition of submarine basalts: implications for the lithium cycle in the oceans

Cited by 412 publications

References 27 publications

A stable (Li, O) and radiogenic (Sr, Nd) isotope perspective on metasomatic processes in a subducting slab

A stable (Li, O) and radiogenic (Sr, Nd) isotope perspective on metasomatic processes in a subducting slab

Lithium-isotope evidence for enhanced silicate weathering during OAE 1a (Early Aptian Selli event)

Li zoning in zircon as a potential geospeedometer and peak temperature indicator

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