Details
| Original language | English |
|---|---|
| Pages (from-to) | 883-892 |
| Number of pages | 10 |
| Journal | European journal of mineralogy |
| Volume | 15 |
| Issue number | 5 |
| Publication status | Published - 17 Nov 2003 |
Abstract
Synchrotron radiation X-ray fluorescence microanalysis (μ-SRXRF) was applied to products of experimental geochemistry to determine (1) trace element diffusivities in andesite melts and (2) trace element partitioning behaviour between garnet and melt. To achieve sufficient spatial resolution, non-focusing and focusing glass capillaries reduced the incoming synchrotron beam down to sizes of 20 and 2.7 μm, respectively. (1) Diffusion couples of trace element-doped and undoped andesite melts were prepared in internally heated pressure vessels. A special sample setup allowed the pencil-shaped synchrotron beam to irradiate volume elements showing identical diffusion behaviour. Eighteen trace elements were measured simultaneously and quickly, resulting in diffusion profiles well suited for evaluating diffusion coefficients. (2) Garnet and andesitic melt were synthesized and equilibrated in a piston cylinder apparatus. The garnets were exceptionally large due to specially designed dehydration-melting experiments with monazite as a trace element source. Coexisting garnets and melt were analyzed with μ-SRXRF, and new distribution coefficients for Sr (0.126), Y (5.27), Zr (0.533), La (0.014), Ce (0.020), Nd (0.245), Sm (1.21), Eu (1.18), Gd (5.29), Yb (52.5), and Lu (76) were determined. However, the general use of μ-SRXRF for experimental partitioning studies is limited due to the relatively poor spatial resolution caused by the penetrating character of the synchrotron beam and due to limited count rates at high energies.
Keywords
- Element partitioning, Garnet, In-situ method, Synchrotron X-ray fluorescence analysis, Trace element diffusion
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: European journal of mineralogy, Vol. 15, No. 5, 17.11.2003, p. 883-892.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Trace element diffusion and element partitioning between garnet and andesite melt using synchrotron X-ray fluorescence microanalysis (μ-SRXRF)
AU - Koepke, Jürgen
AU - Falkenberg, Gerald
AU - Rickers, Karen
AU - Diedrich, Otto
PY - 2003/11/17
Y1 - 2003/11/17
N2 - Synchrotron radiation X-ray fluorescence microanalysis (μ-SRXRF) was applied to products of experimental geochemistry to determine (1) trace element diffusivities in andesite melts and (2) trace element partitioning behaviour between garnet and melt. To achieve sufficient spatial resolution, non-focusing and focusing glass capillaries reduced the incoming synchrotron beam down to sizes of 20 and 2.7 μm, respectively. (1) Diffusion couples of trace element-doped and undoped andesite melts were prepared in internally heated pressure vessels. A special sample setup allowed the pencil-shaped synchrotron beam to irradiate volume elements showing identical diffusion behaviour. Eighteen trace elements were measured simultaneously and quickly, resulting in diffusion profiles well suited for evaluating diffusion coefficients. (2) Garnet and andesitic melt were synthesized and equilibrated in a piston cylinder apparatus. The garnets were exceptionally large due to specially designed dehydration-melting experiments with monazite as a trace element source. Coexisting garnets and melt were analyzed with μ-SRXRF, and new distribution coefficients for Sr (0.126), Y (5.27), Zr (0.533), La (0.014), Ce (0.020), Nd (0.245), Sm (1.21), Eu (1.18), Gd (5.29), Yb (52.5), and Lu (76) were determined. However, the general use of μ-SRXRF for experimental partitioning studies is limited due to the relatively poor spatial resolution caused by the penetrating character of the synchrotron beam and due to limited count rates at high energies.
AB - Synchrotron radiation X-ray fluorescence microanalysis (μ-SRXRF) was applied to products of experimental geochemistry to determine (1) trace element diffusivities in andesite melts and (2) trace element partitioning behaviour between garnet and melt. To achieve sufficient spatial resolution, non-focusing and focusing glass capillaries reduced the incoming synchrotron beam down to sizes of 20 and 2.7 μm, respectively. (1) Diffusion couples of trace element-doped and undoped andesite melts were prepared in internally heated pressure vessels. A special sample setup allowed the pencil-shaped synchrotron beam to irradiate volume elements showing identical diffusion behaviour. Eighteen trace elements were measured simultaneously and quickly, resulting in diffusion profiles well suited for evaluating diffusion coefficients. (2) Garnet and andesitic melt were synthesized and equilibrated in a piston cylinder apparatus. The garnets were exceptionally large due to specially designed dehydration-melting experiments with monazite as a trace element source. Coexisting garnets and melt were analyzed with μ-SRXRF, and new distribution coefficients for Sr (0.126), Y (5.27), Zr (0.533), La (0.014), Ce (0.020), Nd (0.245), Sm (1.21), Eu (1.18), Gd (5.29), Yb (52.5), and Lu (76) were determined. However, the general use of μ-SRXRF for experimental partitioning studies is limited due to the relatively poor spatial resolution caused by the penetrating character of the synchrotron beam and due to limited count rates at high energies.
KW - Element partitioning
KW - Garnet
KW - In-situ method
KW - Synchrotron X-ray fluorescence analysis
KW - Trace element diffusion
UR - http://www.scopus.com/inward/record.url?scp=0345099285&partnerID=8YFLogxK
U2 - 10.1127/0935-1221/2003/0015-0883
DO - 10.1127/0935-1221/2003/0015-0883
M3 - Article
AN - SCOPUS:0345099285
VL - 15
SP - 883
EP - 892
JO - European journal of mineralogy
JF - European journal of mineralogy
SN - 0935-1221
IS - 5
ER -