Iron isotope tracing of mantle heterogeneity within the source regions of oceanic basalts

Williams, Helen M.; Bizimis, Michael

doi:10.1016/j.epsl.2014.07.033

Cited by 150 publications

(143 citation statements)

References 95 publications

Supporting

Mentioning

124

Contrasting

Order By: Relevance

“…The mean Fe isotope compositions of these standards are: d 57 Fe = 0.07 ± 0.04‰ (2SD, n = 4) for BIR-1, and À0.84 ± 0.02‰ for Nod-P1 (2SD, n = 7). These data are in excellent agreement with those reported previously (Weyer et al, 2005;Millet et al, 2012;Williams and Bizimis, 2014).…”

Section: Iron and Silicon Stable Isotope Measurementssupporting

confidence: 83%

“…Errors are reported as the 2 standard deviations of replicate analyses. Mass dependence, long-term reproducibility and accuracy were evaluated by analysis of an in-house FeCl salt standard (d 57 Fe = À1.05 ± 0.07‰, 2SD, n = 67) previously analysed in other studies (Williams et al, 2014). The international rock standards BIR-1 (Icelandic basalt) and Nod-P1 (Pacific ferromanganese nodule) were analysed over the course of this study.…”

Section: Iron and Silicon Stable Isotope Measurementsmentioning

confidence: 99%

“…Dissolution, Fe purification and isotope analyses were undertaken using established procedures (Williams and Bizimis, 2014). Briefly, bulk soil samples and the vegetation sample were first digested in aqua regia (3:1 HCl:HNO 3 ) and following a reflux and evaporation cycle, were subsequently treated with concentrated HF:HNO 3 (10:1) in order to dissolve any detrital material.…”

Section: Iron and Silicon Stable Isotope Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Iron and silicon isotope behaviour accompanying weathering in Icelandic soils, and the implications for iron export from peatlands

Opfergelt

Williams

Cornélis

et al. 2017

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Incipient warming of peatlands at high latitudes is expected to modify soil drainage and hence the redox conditions, which has implications for Fe export from soils. This study uses Fe isotopes to assess the processes controlling Fe export in a range of Icelandic soils including peat soils derived from the same parent basalt, where Fe isotope variations principally reflect differences in weathering and drainage. In poorly weathered, well-drained soils (non-peat soils), the limited Fe isotope fractionation in soil solutions relative to the bulk soil (D 57 Fe solution-soil = À0.11 ± 0.12‰) is attributed to proton-promoted mineral dissolution. In the more weathered poorly drained soils (peat soils), the soil solutions are usually lighter than the bulk soil (D 57 Fe solution-soil = À0.41 ± 0.32‰), which indicates that Fe has been mobilised by reductive mineral dissolution and/or ligand-controlled dissolution. The results highlight the presence of Fe-organic complexes in solution in anoxic conditions. An additional constraint on soil weathering is provided by Si isotopes. The Si isotope composition of the soil solutions relative to the soil (D 30 Si solution-soil = 0.92 ± 0.26‰) generally reflects the incorporation of light Si isotopes in secondary aluminosilicates. Under anoxic conditions in peat soils, the largest Si isotope fractionation in soil solutions relative to the bulk soil is observed (D 30 Si solution-soil = 1.63 ± 0.40‰) and attributed to the cumulative contribution of secondary clay minerals and amorphous silica precipitation. Si supersaturation in solution with respect to amorphous silica is reached upon freezing when Al availability to form aluminosilicates is limited by the affinity of Al for metal-organic complexes. Therefore, the precipitation of amorphous silica in peat soils indirectly supports the formation of metal-organic complexes in poorly drained soils. These observations highlight that in a scenario of decreasing soil drainage with warming high latitude peatlands, Fe export from soils as Fe-organic complexes will increase, which in turn has implications for Fe transport in rivers, and ultimately the delivery of Fe to the oceans.

show abstract

Section: Iron and Silicon Stable Isotope Measurementssupporting

confidence: 83%

Section: Iron and Silicon Stable Isotope Measurementsmentioning

confidence: 99%

Section: Iron and Silicon Stable Isotope Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Iron and silicon isotope behaviour accompanying weathering in Icelandic soils, and the implications for iron export from peatlands

Opfergelt

Williams

Cornélis

et al. 2017

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

show abstract

“…In this contribution, we present first systematic investigations of radiogenic Hf and stable Fe isotope values for these three geostandards in order to assess their suitability as SRM, and to provide a first assessment of variations in isotope composition in these rock powders. Both, Hf and Fe isotope analyses in bulk rock powders have become a common application in high-temperature geoscientific research individually [8][9][10][11] or in tandem [12,13] with a notable, rapid increase in Chinese research facilities.…”

Section: Introductionmentioning

confidence: 99%

Assessment of hafnium and iron isotope compositions of Chinese national igneous rock standard materials GSR-1 (granite), GSR-2 (andesite), and GSR-3 (basalt)

Cheng

Nebel

Sossi

et al. 2015

International Journal of Mass Spectrometry

View full text Add to dashboard Cite

“…Some of the Fe isotope variation may be due to small (0.15 to 0.2 ‰) but significant fractionation that occurs between pyroxene and olivine due to differences in bonding environment (Williams and Bizimis, 2014). Williams and Bizimis found that iron in garnet pyroxenites from Hawaii is on average isotopically heavy (d 57 Fe IRMM-14 = +0.10 to +0.27 ‰) compared to depleted peridotites (-0.34 to +0.14 ‰), primitive mantle (~+0.14 ‰), and MORB (~+0.16 ‰).…”

Section: Evidence From Unconventional Stable Isotopesmentioning

confidence: 99%

Probing the Earth’s Deep Interior Through Geochemistry

White¹

2015

Geochem. Persp.

View full text Add to dashboard Cite

Iron isotope tracing of mantle heterogeneity within the source regions of oceanic basalts

Cited by 150 publications

References 95 publications

Iron and silicon isotope behaviour accompanying weathering in Icelandic soils, and the implications for iron export from peatlands

Iron and silicon isotope behaviour accompanying weathering in Icelandic soils, and the implications for iron export from peatlands

Assessment of hafnium and iron isotope compositions of Chinese national igneous rock standard materials GSR-1 (granite), GSR-2 (andesite), and GSR-3 (basalt)

Probing the Earth’s Deep Interior Through Geochemistry

Contact Info

Product

Resources

About