Volatile composition of microinclusions in diamonds from the Panda kimberlite, Canada: Implications for chemical and isotopic heterogeneity in the mantle

Burgess, R.; Cartigny, Pierre; Harrison, D.; Hobson, Emily; Harris, Jeff W.

doi:10.1016/j.gca.2008.12.025

Cited by 42 publications

(36 citation statements)

References 53 publications

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“…Constraining halogen fractionation during metamorphic fluid-rock interactions is important for utilising Br/Cl and I/Cl as fluid tracers in a variety of crustal and/or mantle environments (e.g. Kendrick et al, 2006a;Burgess et al, 2009). In addition, scapolite can contain significant quantities of potassium (64 wt%; Teertstra and Sherriff, 1997), but is virtually untested as an 40 Ar/ 39 Ar chronometer of metamorphic processes (cf.…”

Section: Introductionmentioning

confidence: 99%

New constraints on the release of noble gases during in vacuo crushing and application to scapolite Br–Cl–I and 40Ar/39Ar age determinations

Kendrick

Phillips

2009

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 99%

New constraints on the release of noble gases during in vacuo crushing and application to scapolite Br–Cl–I and 40Ar/39Ar age determinations

Kendrick

Phillips

2009

Geochimica et Cosmochimica Acta

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“…However, because the Re‐Os system is relatively robust against subsequent processing in the mantle (e.g., Walker et al, ), the Re depletion model ages might not be reset during the metasomatic events, in which the MORB‐like halogens may be introduced. A common MORB‐like end‐member has been found in diamonds from Africa and Siberia and as a component in Canadian diamonds showing a large range of fractionated halogen ratios (Burgess et al, , ; Johnson et al, ). The eruption ages of host kimberlites of the diamonds are up to about 380 Ma (Burgess et al, , ; Johnson et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…A common MORB‐like end‐member has been found in diamonds from Africa and Siberia and as a component in Canadian diamonds showing a large range of fractionated halogen ratios (Burgess et al, , ; Johnson et al, ). The eruption ages of host kimberlites of the diamonds are up to about 380 Ma (Burgess et al, , ; Johnson et al, ). The slightly higher I/Cl ratios of African diamonds relative to the modern MORB value (Burgess et al, ; Johnson et al, ) may indicate that the mantle I/Cl value was higher in the past, although equally it may reflect a relatively minor level of mantle heterogeneity.…”

Section: Discussionmentioning

confidence: 99%

“…As samples from the subcontinental lithospheric mantle (SCLM), diamonds exhibit a wide range of Br/Cl and I/Cl ratios. However, Siberian diamonds have MORB‐like halogen ratios and a MORB‐like end‐member is also present in diamonds from Canadian and African kimberlite sources, suggesting this component is widespread globally in the SCLM (Burgess et al, , ; Johnson et al, ). However, the mechanisms responsible for reducing the I/Cl value of subducted fluid(s) to the MORB value and the magnitude of I recycling into the asthenospheric mantle are not well understood.…”

Section: Introductionmentioning

confidence: 99%

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Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Kobayashi

Sumino

Burgess

et al. 2019

Geochem Geophys Geosyst

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We present halogen, noble gas, and major and trace element compositions of mantle xenoliths from intraplate settings (Eifel, Kilbourne Hole, San Carlos, and Hawaii). The xenoliths show a wide range of halogen elemental ratios, which form two arrays centered on the halogen composition of mid-ocean ridge basalts. The samples on the array toward high I/Cl value have relatively low Cl concentration and low ratios of highly incompatible elements relative to heavy rare earth elements, whereas the samples on the array toward low Br/Cl value have higher Cl concentration and trace elements ratios. The detailed mechanisms to account for these signatures are equivocal at present. However, they are most likely to be related to secondary processes of volatile loss during partial melting and secondary phase formation during interaction with melts. The common primary mid-ocean ridge basalt-like halogen ratios in mantle xenoliths from different parts of the globe indicate that the mantle itself must have a relatively uniform composition over a wide scale. The mantle has maintained its halogen composition over billion year timescales without being affected by I-rich halogens being transported into the mantle. Mass balance calculations suggest that, in order to maintain the I/Cl ratio of the convecting mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present-day mantle value. Plain Language Summary Elemental and isotopic compositions of volatile species such ashalogens, noble gases, hydrogen, and carbon can be used to trace the evolution of these species in the Earth. Halogens are important tracers of subduction recycling of surface volatiles into the mantle: however, there is only limited understanding of halogens in the mantle. Here we provide new halogen data of mantle xenoliths from intraplate settings. The mantle xenoliths show a wide range of halogen elemental ratios, which are expected to be related to later processes after the xenoliths formed. A similar primary halogen component is present in the xenoliths sampled from different localities. This suggests that the mantle has the uniform halogen composition over a wide scale. The halogen composition in the convecting mantle is expected to have remained constant over more than 2 billion years, despite subduction of iodine-rich halogens. We used mass balance calculations to gain understanding into evolution rate of I/Cl ratio in the mantle. Calculations suggest that, in order to maintain the I/Cl ratio of the mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present-day mantle value.

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“…Arrows indicate direction of end-member fluid compositions. Diamond data from Johnson et al (2000) and Burgess et al (2002Burgess et al ( , 2009. References for MORB composition are given in Figure 3.…”

Section: The Search For Extinct 36 CLmentioning

confidence: 99%

The other isotopes: research avenues based on ³⁶ Ar, ³⁷ Ar and ³⁸ Ar

Turner

Burgess

2013

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The earliest publications on 40 Ar/ 39 Ar dating recognized the usefulness of 39 Ar/ 37 Ar in providing chemical clues to the species releasing argon during stepped heating, while 37 Ar measurements are required for interference corrections. Aside from these essential roles, 36 Ar, 37 Ar and 38 Ar have other useful applications. The dominance of Ca as the target nucleus for the production of 38 Ar and 36 Ar from spallation by cosmic rays has led to the determination of cosmic ray exposure ages from 38 Ar/ 37 Ar. 38 Ar production from Cl has an important role in the study of ore minerals containing saline fluid inclusions, both in dating and in understanding their genesis. Combining 38 Ar/ 36 Ar ratios with micro-thermometric determinations of salinity provides a way to determine absolute concentrations of noble gases in ore fluids. Absorption of cosmic-ray-produced secondary neutrons by 35 Cl and 37 Cl provides another means to study cosmic ray exposure of meteorites. 36 S excesses in meteoritic sodalite provide evidence of now-extinct 36 Cl in the early Solar System. Surprisingly, there is little or no evidence of excess 36 Ar beyond what can be accounted for by secondary neutron exposure. We have recently devised a method to identify monoisotopic 36 Ar from 36 Cl decay.

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Volatile composition of microinclusions in diamonds from the Panda kimberlite, Canada: Implications for chemical and isotopic heterogeneity in the mantle

Cited by 42 publications

References 53 publications

New constraints on the release of noble gases during in vacuo crushing and application to scapolite Br–Cl–I and 40Ar/39Ar age determinations

New constraints on the release of noble gases during in vacuo crushing and application to scapolite Br–Cl–I and 40Ar/39Ar age determinations

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

The other isotopes: research avenues based on ³⁶ Ar, ³⁷ Ar and ³⁸ Ar

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Volatile composition of microinclusions in diamonds from the Panda kimberlite, Canada: Implications for chemical and isotopic heterogeneity in the mantle

Cited by 42 publications

References 53 publications

New constraints on the release of noble gases during in vacuo crushing and application to scapolite Br–Cl–I and 40Ar/39Ar age determinations

New constraints on the release of noble gases during in vacuo crushing and application to scapolite Br–Cl–I and 40Ar/39Ar age determinations

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

The other isotopes: research avenues based on 36 Ar, 37 Ar and 38 Ar

Contact Info

Product

Resources

About

The other isotopes: research avenues based on ³⁶ Ar, ³⁷ Ar and ³⁸ Ar