Komatiites constrain molybdenum isotope composition of the Earth's mantle

Greber, Nicolas D.; Puchtel, I. S.; Nägler, Thomas F.; Mezger, Klaus

doi:10.1016/j.epsl.2015.03.051

Cited by 88 publications

(62 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, Greber et al . ) involve significant amounts of effort and durations in excess of 24 hrs. The present method significantly reduces the time required for the isolation of Mo from matrix elements.…”

Section: Discussionmentioning

confidence: 99%

“…, Greber et al . ) likely largely due to the capability of our method to process larger sample sizes, which allows the samples to be analysed at larger ion intensities. Processing larger sample sizes may also mitigate problems related to the potentially heterogeneous distribution of Mo within the rock sample although this critically depends on the length‐scale of sample heterogeneity.…”

Section: Discussionmentioning

confidence: 99%

“…Methods previously described for the chemical isolation of Mo from geological matrices (Mar echal et al 1999, Barling et al 2001, Archer and Vance 2004, Pearce et al 2009, Burkhardt et al 2014, Voegelin et al 2014, Greber et al 2015 involve significant amounts of effort and durations in excess of 24 hrs. The present method significantly reduces the time required for the isolation of Mo from matrix elements.…”

Section: Recovery Of Mo After Chemical Separation and Time Consumptionmentioning

confidence: 99%

“…Thus, only small isotopic perturbations are expected for oceanic mantle-derived rocks containing such a recycled component. In fact, the total variation in 98 Mo/ 95 Mo of magmatic rocks from various tectonic settings analysed so far is less than 1‰ (Siebert et al 2003, Pearce et al 2009, Burkhardt et al 2014, Voegelin et al 2014, Freymuth et al 2015, Greber et al 2015, Yang et al 2015. To resolve and understand such subtle isotopic variations, high-precision Mo isotope data for magmatic rocks are required.…”

mentioning

confidence: 99%

“…The lack of a more efficient and convenient chemical separation technique therefore remains one of the main obstacles in undertaking a comprehensive study of Mo mantle isotope systematics. In fact, there are few Mo isotope data available for magmatic rocks (Siebert et al 2003, Pearce et al 2009, Burkhardt et al 2014, Voegelin et al 2014, Greber et al 2015, Yang et al 2015. This is also expressed in a lack of Mo isotope data for well-characterised magmatic geological reference materials.…”

mentioning

confidence: 99%

See 4 more Smart Citations

High-Precision Mass-Dependent Molybdenum Isotope Variations in Magmatic Rocks Determined by Double-Spike MC-ICP-MS

Willbold

Hibbert

Lai

et al. 2015

Geostand Geoanal Res

View full text Add to dashboard Cite

Small mass‐dependent variations of molybdenum isotope ratios in oceanic and island arc rocks are expected as a result of recycling altered oceanic crust and sediments into the mantle at convergent plate margins over geological timescales. However, the determination of molybdenum isotope data precise and accurate enough to identify these subtle isotopic differences remains challenging. Large sample sizes – in excess of 200 mg – need to be chemically processed to isolate enough molybdenum in order to allow sufficiently high‐precision isotope analyses using double‐spike MC‐ICP‐MS techniques. Established methods are either unable to process such large amounts of silicate material or require several distinct chemical processing steps, making the analyses very time‐consuming. Here, we present a new and efficient single‐pass chromatographic exchange technique for the chemical isolation of molybdenum from silicate and metal matrices. To test our new method, we analysed USGS reference materials BHVO‐2 and BIR‐1. Our new data are consistent with those derived from more involved and time‐consuming methods for these two reference materials previously published. We also provide the first molybdenum isotope data for USGS reference materials AGV‐2, the GSJ reference material JB‐2 as well as metal NIST SRM 361.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Recovery Of Mo After Chemical Separation and Time Consumptionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

High-Precision Mass-Dependent Molybdenum Isotope Variations in Magmatic Rocks Determined by Double-Spike MC-ICP-MS

Willbold

Hibbert

Lai

et al. 2015

Geostand Geoanal Res

View full text Add to dashboard Cite

show abstract

The Molybdenum Isotope System as a Tracer of Slab Input in Subduction Zones: An Example From Martinique, Lesser Antilles Arc

Gaschnig

Reinhard

Planavsky

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Molybdenum isotopes are fractionated by Earth‐surface processes and may provide a tracer for the recycling of crustal material into the mantle. Here, we examined the Mo isotope composition of arc lavas from Martinique in the Lesser Antilles arc, along with Cretaceous and Cenozoic Deep Sea Drilling Project sediments representing potential sedimentary inputs into the subduction zone. Mo stable isotope composition (defined as δ98Mo in ‰ deviation from the NIST 3134 standard) in lavas older than ∼7 million years (Ma) exhibits a narrow range similar to and slightly higher than MORB, whereas those younger than ∼7 Ma show a much greater range and extend to unusually low δ98Mo values. Sediments from DSDP Leg 78A, Site 543 have uniformly low δ98Mo values whereas Leg 14, Site 144 contains both sediments with isotopically light Mo and Mo‐enriched black shales with isotopically heavy Mo. When coupled with published radiogenic isotope data, Mo isotope systematics of the lavas can be explained through binary mixing between a MORB‐like end‐member and different sedimentary compositions identified in the DSDP cores. The lavas older than ∼7 Ma were influenced by incorporation of isotopically heavy black shales into the mantle wedge. The younger lavas are the product of mixing isotopically light sedimentary material into the mantle wedge. The change in Mo isotope composition of the lavas at ∼7 Ma is interpreted to reflect the removal of the Cretaceous black shale component due to the arrival of younger ocean crust where the age‐equivalent Cretaceous sediments were deposited in shallower oxic waters. Isotopic fractionation of Mo during its removal from the slab is not required to explain the observed systematics in this system.

show abstract

Isotope Fractionation Processes of Selected Elements

Hoefs¹

2021

Springer Textbooks in Earth Sciences, Geography and Environment

View full text Add to dashboard Cite

Komatiites constrain molybdenum isotope composition of the Earth's mantle

Cited by 88 publications

References 40 publications

High-Precision Mass-Dependent Molybdenum Isotope Variations in Magmatic Rocks Determined by Double-Spike MC-ICP-MS

High-Precision Mass-Dependent Molybdenum Isotope Variations in Magmatic Rocks Determined by Double-Spike MC-ICP-MS

The Molybdenum Isotope System as a Tracer of Slab Input in Subduction Zones: An Example From Martinique, Lesser Antilles Arc

Isotope Fractionation Processes of Selected Elements

Contact Info

Product

Resources

About