Zobrazeno 1 - 10
of 17
pro vyhledávání: '"R. B. Georg"'
Publikováno v:
Biogeosciences, Vol 8, Iss 1, Pp 89-112 (2011)
Silicon (Si) released as H4SiO4 by weathering of Si-containing solid phases is partly recycled through vegetation before its land-to-rivers transfer. By accumulating in terrestrial plants to a similar extent as some major macronutrients (0.1–10% Si
Externí odkaz:
https://doaj.org/article/1ad3e1b249b242f1b5406a9895103b0f
Autor:
Helen M. Williams, Sophie Opfergelt, Christopher Siebert, R. B. Georg, R.A Guicharnaud, Sigurdur R. Gislason, Alison Halliday, Jean-Thomas Cornélis, Kevin W. Burton
Publikováno v:
Geochimica et Cosmochimica Acta, 2017, Vol.217, pp.273-291 [Peer Reviewed Journal]
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::306ebcc6dff693502db7a98f2e350de0
http://dro.dur.ac.uk/22963/
http://dro.dur.ac.uk/22963/
Autor:
Christopher Siebert, Sigurdur R. Gislason, Sophie Opfergelt, Alex N. Halliday, R. B. Georg, Kevin W. Burton, Bergur Sigfússon, A.J. West, R. Guicharnaud
Publikováno v:
Geochimica et Cosmochimica Acta. 125:110-130
Understanding the biogeochemical cycle of magnesium (Mg) is not only crucial for terrestrial ecology, as this element is a key nutrient for plants, but also for quantifying chemical weathering fluxes of Mg and associated atmospheric CO2 consumption,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed27e1d917d2676de02837ae9897b58c
https://doi.org/10.1016/j.gca.2013.09.036
https://doi.org/10.1016/j.gca.2013.09.036
Publikováno v:
Earth and Planetary Science Letters. 367:28-38
The marine osmium (Os) isotope composition shows some significant variability during the past 250,000 yr, which also correlates with climate sensitive proxies, e.g. oxygen isotopes. This correlation led to the assumption that the marine Os may in par
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::231b09676cd7943cf7aff1df6f655c94
https://doi.org/10.1016/j.epsl.2013.02.018
https://doi.org/10.1016/j.epsl.2013.02.018
Autor:
Alex N. Halliday, Alex R. Baker, R. B. Georg, G. F. de Souza, Sarah M. Aciego, Jörg Rickli, Martin Frank
Publikováno v:
Geochimica et Cosmochimica Acta, 74 . pp. 540-557.
We present hafnium (Hf) and neodymium (Nd) isotopic compositions and concentrations in surface waters of the eastern Atlantic Ocean between the coast of Spain and South-Africa. These data are complemented by Hf and Nd isotopic and concentration data,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ea16cbaa57a8249fd49bd493b8460b3
https://doi.org/10.1016/j.gca.2009.10.006
https://doi.org/10.1016/j.gca.2009.10.006
Thirty-five mafic and ultramafic rocks have been analysed for their silicon isotopic composition to very high precision with the aim of providing a robust average value for the silicate earth. This is of importance to studies using the difference bet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44d652abb1cea9d9a02baad6393b95b8
https://ora.ox.ac.uk/objects/uuid:dc4b3024-8ffa-489e-b3b5-63e9ebf8b21d
https://ora.ox.ac.uk/objects/uuid:dc4b3024-8ffa-489e-b3b5-63e9ebf8b21d
Techniques for the purification of Si for the determination of its natural stable isotopic composition have in the past been based on the requirements for gas-source mass-spectrometry, rather than MC-ICPMS. For high precision analyses by MC-ICPMS it
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0701724d16405f0b27c161e1343cf6f7
https://ora.ox.ac.uk/objects/uuid:7172ff91-d306-4007-857c-9f641eaf05bd
https://ora.ox.ac.uk/objects/uuid:7172ff91-d306-4007-857c-9f641eaf05bd
The silicon (Si) isotope compositions of 42 meteorite and terrestrial samples have been determined using MC-ICPMS with the aim of resolving the current debate over their compositions and the implications for core formation. No systematic δ30Si diffe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8547a2d57e9bf277959b8faa2f35dcd5
https://doi.org/10.1016/j.gca.2011.03.044
https://doi.org/10.1016/j.gca.2011.03.044
Autor:
Sophie Opfergelt, Alex N. Halliday, R. B. Georg, Y.M. Cabidoche, Kevin W. Burton, Bruno Delvaux
Publikováno v:
Earth and Planetary Science Letters
Earth and Planetary Science Letters, Elsevier, 2012, pp.176-185. ⟨10.1016/j.epsl.2012.06.010⟩
Earth and Planetary Science Letters, Elsevier, 2012, pp.176-185. ⟨10.1016/j.epsl.2012.06.010⟩
Supplementary data associated with this article can be found in the online version at http://dx.doi.org/10.1016/j.epsl.2012.06.010; International audience; Magnesium (Mg) stable isotopes are increasingly used as a weathering proxy in soils and rivers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e554f1d93f34a1291b1424e2c1830ed
https://ora.ox.ac.uk/objects/uuid:855a8170-6ecd-4f70-8cbb-755262931feb
https://ora.ox.ac.uk/objects/uuid:855a8170-6ecd-4f70-8cbb-755262931feb
We present some of the first analyses of the stable isotopic composition of dissolved silicon (Si) in groundwater. The groundwater samples were from the Navajo Sandstone aquifer at Black Mesa, Arizona, USA, and the Si isotope composition of detrital
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15421095a056574e91951c629d95725b
https://ora.ox.ac.uk/objects/uuid:8ad05a10-e2ca-42c4-be93-9887cb61eeb1
https://ora.ox.ac.uk/objects/uuid:8ad05a10-e2ca-42c4-be93-9887cb61eeb1