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Dear all,
Does anyone out there who does ICP-MS analyses, have some information on
analyzing REE in fluid inclusions in quartz grains.
Thanks.
Regards, Rune
Rune S. Selbekk Phone job. (+47) 77 64 44 21
Department of Geology Phone private (+47) 77 63 25 57
University of Tromso Fax.(+47) 77 64 56 00
Dramsveien 201
N-9000 Tromso E-mail: runes@ibg.uit.no
Norway
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Check out Geoch. Cosmo. Acta, v.57, 4513-4516
Edwin Roedder
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Please see Ghazi, et al., "Determination of rare earth elements in
fluid inclusions by ICP-MS," Geochimica et Cosmochimica Acta, v. 57,
pp. 4513-4516, 1993, for some tips.
Dave Vanko
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One paper you can check out is:
Banks et al 1994, REE composition of an aqueous magmatic fluid: A fluid
inclusion study from the Capitan Pluton NM USA. Chemical Geology 113 p259-272
It has references to other papers by Banks on the methods used.
Andy Campbell
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Dear Rune, et al.
Further to Ed Roedder's reply, we also looked at ICP-MS analysis of fluid
inclusions, following crush-leach: see Banks et al., Chemical Geology v.113,
259-272.
Our main concern was that adsorbtion onto the fresh quartz surfaces would
be a serious problem. When Simon Bottrell was developing the LaCl3 leach
solution to combat adsorbtion of Ca onto quartz (which IS A MAJOR problem
for crush-leach), part of the logic was that La would saturate the adsorbtion
sites. Well, it certainly seems to work to help Ca-analysis, but much to
our surprise and delight it turned out that adsorbtion of REE from crush-leach
solutions is not such a big problem as we feared. Dave Banks experimented
grinding quartz in standard solutions with a range of HNO3 concentrations,
and spiked with Nb, to suppress adsorbtion, but basically found that although
adsorbtion occurred, especially for the LREE, it was not a big problem -
the acidified leach solutions that Ed Roedder used will probably have done
the job quite adequately, although we spiked with a small amount of Nb to
be sure.
The ICP-MS analysis is not the problem, as always it is getting a pure sample
with a single inclusion population that is the stumbling block.
Bruce Yardley
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