Výsledky vyhledávání - "J.M.G. Shelley"

The effect of composition on Cr2+/Cr3+ in silicate melts

Autor: Garry J. Foran, Hugh St. C. O'Neill, Andrew J. Berry, Dean R. Scott, J.M.G. Shelley

Publikováno v: American Mineralogist. 91:1901-1908

Chromium K -edge X-ray absorption near-edge structure (XANES) spectra were recorded at room temperature for 27 CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) glass compositions quenched from melts equilibrated at various oxygen fugacities ( f O 2 ) at 1400 °C. Valu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::09b2f64d8abc39a4a1786dc2caaafb27
https://doi.org/10.2138/am.2006.2097

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Complex speleothem growth processes revealed by trace element mapping and scanning electron microscopy of annual layers

Autor: John Chappell, J.M.G. Shelley, Pauline C. Treble

Publikováno v: Geochimica et Cosmochimica Acta. 69:4855-4863

Closely-spaced transects measured by excimer laser ablation inductively-coupled plasma mass spectrometry (ELA-ICPMS) at 5 and 32 μm spatial resolution are used to generate trace element composition maps (Ba, Sr, Mg, U, Na, P and Al) from MND-S1, a p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8d94203e4351ef7880d418611f6fabcd
https://doi.org/10.1016/j.gca.2005.06.008

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Comparison of high resolution sub-annual records of trace elements in a modern (1911–1992) speleothem with instrumental climate data from southwest Australia

Autor: John Chappell, J.M.G. Shelley, Pauline C. Treble

Publikováno v: Earth and Planetary Science Letters. 216:141-153

High spatial resolution measurements of Mg, P, U, Sr, Ba and Na using 193-nm excimer laser-ablation inductively coupled plasma mass spectrometry has revealed clearly resolvable annual cycles in a modern speleothem from southwestern Australia. The age

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7b15be42711c519f8e8ef4fa766147ca
https://doi.org/10.1016/s0012-821x(03)00504-1

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Partitioning of iron between magnesian silicate perovskite and magnesiowüstite at about 1 Mbar

Autor: J.M.G. Shelley, S. E. Kesson, H. St. C. O'Neill, J. D. Fitz Gerald

Publikováno v: Physics of the Earth and Planetary Interiors. 131:295-310

The disproportionation products of olivine Fo 90 in diamond–anvil cell experiments at about 1 Mbar are magnesian silicate perovskite Mg# ∼94 and a series of magnesiowustites Mg# 85–90, yielding a recommended value of 0.4±0.1 for the distributi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::69322498e6cb75d9d35b8f9885fc4d85
https://doi.org/10.1016/s0031-9201(02)00063-8

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Mineralogy and dynamics of a pyrolite lower mantle

Autor: J.M.G. Shelley, S. E. Kesson, J. D. Fitz Gerald

Publikováno v: Nature. 393:252-255

There is a growing consensus that the Earth's lower mantle possesses a bulk composition broadly similar to that of the upper mantle (known as pyrolite)1,2,3. But little is known about lower-mantle mineralogy and phase chemistry4,5, especially at dept

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5d26ed08851ec1d8a40056794a94e9e6
https://doi.org/10.1038/30466

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Phase relations, structure and crystal chemistry of some aluminous silicate perovskites

Autor: J. D. Fitz Gerald, S. E. Kesson, Raymond Withers, J.M.G. Shelley

Publikováno v: Earth and Planetary Science Letters. 134:187-201

Solid solution of ∼ 25 mole% Al2O3 expands the compositional stability field of Mg,Fe silicate perovskite well beyond the limits encountered in the simple ternary system MgOFeOSiO2. Aluminous perovskites synthesised in laser-heated diamond anvil ce

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8af8c24f0f0cce0ddf5f4a654b05583c
https://doi.org/10.1016/0012-821x(95)00112-p

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Mineral chemistry and density of subducted basaltic crust at lower-mantle pressures

Autor: J.M.G. Shelley, J. D. Fitz Gerald, S. E. Kesson

Publikováno v: Nature. 372:767-769

SUBDUCTED slabs are less dense than the surrounding mantle near the base of the transition zone (~660 km depth) because of the survival of garnet in former basaltic crust: by this depth mantle peridotite has transformed to denser perovskitite1'2. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bd9e0fd7ae3d5aa366f2622d50deae73
https://doi.org/10.1038/372767a0

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Deposition and element fractionation processes during atmospheric pressure laser sampling for analysis by ICP-MS

Autor: Stephen Eggins, Leslie Kinsley, J.M.G. Shelley

Publikováno v: Scopus-Elsevier

We have used an ArF excimer laser coupled to a quadrupole inductively coupled plasma mass spectrometry (ICP-MS) for the measurement of a range of elements during excavation of a deepening ablation pit in a synthetic glass (NIST 612). Analyte behaviou

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1681de01ec159949aac89f46546d4f6
http://www.scopus.com/inward/record.url?eid=2-s2.0-0032070169&partnerID=MN8TOARS

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