Details
| Original language | English |
|---|---|
| Pages (from-to) | 907-929 |
| Number of pages | 23 |
| Journal | Geostandards and Geoanalytical Research |
| Volume | 47 |
| Issue number | 4 |
| Early online date | 9 Jun 2023 |
| Publication status | Published - Dec 2023 |
Abstract
Determination of alkali elements is important to Earth scientists, yet suitable and reliable microanalytical reference materials are lacking. This paper proposes a new albite reference material and evaluates the potential for future K-feldspar reference materials. The proposed Piz Beverin albite reference material from Switzerland yields a homogeneous composition at the centimetre- to micrometre-scale for Si, Al and Na with < 2000 μg g -1 total trace elements (mostly heterogeneously distributed Ca, K and Sr). EPMA and LA-ICP-MS measurements confirm a composition of 99.5(2)% albite component, which is supported further by bulk XRF measurements. A round robin evaluation involving nine independent EPMA laboratories confirms its composition and homogeneity for Si, Al and Na. In addition, a set of five distinct clear K-feldspar samples was evaluated as possible reference materials. The first two crystals of adular and orthoclase yield unacceptable inhomogeneities with > 2% relative local variations of Na, K and Ba contents. The three other investigated sets of K-feldspar crystals are yellow sanidine crystals from Itrongay (Madagascar). Despite distinct compositions, EPMA confirms they are each homogeneous at the centimetre to micrometre scale for Si, Al and K and have no apparent inclusions; further investigation to find larger amounts of these materials is therefore justified.
Keywords
- LA-ICP-MS and XRF analysis, RM evaluation, alkali elements, combined EPMA, feldspar minerals, natural microanalytical reference materials
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Geostandards and Geoanalytical Research, Vol. 47, No. 4, 12.2023, p. 907-929.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - A New Albite Microanalytical Reference Material from Piz Beverin for Na, Al and Si Determination, and the Potential for New K‐Feldspar Reference Materials
AU - Allaz, Julien M.
AU - Guillong, Marcel
AU - Tavazzani, Lorenzo
AU - Spiekermann, Georg
AU - Zehnder, Lydia
AU - Bullock, Emma
AU - DesOrmeau, Joel
AU - Jercinovic, Michael J.
AU - Krause, Joachim
AU - Marxer, Felix
AU - Nachlas, William O.
AU - Spratt, John
N1 - Funding Information: Prof. Peter Brack, Dr. Andrea Galli and Dr. Eric Reusser are warmly thanked for providing these mineral samples, along with their unknown collectors. PhD student Taraneh Roodpeyma is thanked for first identified this promising albite μRM for her research needs at ETH Zürich. PhD student Rebecca Zech is acknowledged for her help with the Selfrag. We are also grateful to one anonymous EPMA laboratory for providing data and to Dr. Robert Downs for uploading the Raman data on RRUFF. We thank editor Dr. Paul Sylvester and two anonymous reviewers for their wise feedback. The hosting institutions of each respective scientific laboratory are thanked for their continuous financial support. JD at UNR gratefully acknowledges support from NSF EAR‐MRI award 2018647. FM acknowledges funding by the DFG project HO1337/47 (part of the Forschungsgruppe FOR 2881 "Diffusion chronometry of magmatic systems"). All authors declare that they have no conflicts of interest. Open access funding provided by Eidgenossische Technische Hochschule Zurich.
PY - 2023/12
Y1 - 2023/12
N2 - Determination of alkali elements is important to Earth scientists, yet suitable and reliable microanalytical reference materials are lacking. This paper proposes a new albite reference material and evaluates the potential for future K-feldspar reference materials. The proposed Piz Beverin albite reference material from Switzerland yields a homogeneous composition at the centimetre- to micrometre-scale for Si, Al and Na with < 2000 μg g -1 total trace elements (mostly heterogeneously distributed Ca, K and Sr). EPMA and LA-ICP-MS measurements confirm a composition of 99.5(2)% albite component, which is supported further by bulk XRF measurements. A round robin evaluation involving nine independent EPMA laboratories confirms its composition and homogeneity for Si, Al and Na. In addition, a set of five distinct clear K-feldspar samples was evaluated as possible reference materials. The first two crystals of adular and orthoclase yield unacceptable inhomogeneities with > 2% relative local variations of Na, K and Ba contents. The three other investigated sets of K-feldspar crystals are yellow sanidine crystals from Itrongay (Madagascar). Despite distinct compositions, EPMA confirms they are each homogeneous at the centimetre to micrometre scale for Si, Al and K and have no apparent inclusions; further investigation to find larger amounts of these materials is therefore justified.
AB - Determination of alkali elements is important to Earth scientists, yet suitable and reliable microanalytical reference materials are lacking. This paper proposes a new albite reference material and evaluates the potential for future K-feldspar reference materials. The proposed Piz Beverin albite reference material from Switzerland yields a homogeneous composition at the centimetre- to micrometre-scale for Si, Al and Na with < 2000 μg g -1 total trace elements (mostly heterogeneously distributed Ca, K and Sr). EPMA and LA-ICP-MS measurements confirm a composition of 99.5(2)% albite component, which is supported further by bulk XRF measurements. A round robin evaluation involving nine independent EPMA laboratories confirms its composition and homogeneity for Si, Al and Na. In addition, a set of five distinct clear K-feldspar samples was evaluated as possible reference materials. The first two crystals of adular and orthoclase yield unacceptable inhomogeneities with > 2% relative local variations of Na, K and Ba contents. The three other investigated sets of K-feldspar crystals are yellow sanidine crystals from Itrongay (Madagascar). Despite distinct compositions, EPMA confirms they are each homogeneous at the centimetre to micrometre scale for Si, Al and K and have no apparent inclusions; further investigation to find larger amounts of these materials is therefore justified.
KW - LA-ICP-MS and XRF analysis
KW - RM evaluation
KW - alkali elements
KW - combined EPMA
KW - feldspar minerals
KW - natural microanalytical reference materials
UR - http://www.scopus.com/inward/record.url?scp=85165301469&partnerID=8YFLogxK
U2 - 10.1111/ggr.12515
DO - 10.1111/ggr.12515
M3 - Article
VL - 47
SP - 907
EP - 929
JO - Geostandards and Geoanalytical Research
JF - Geostandards and Geoanalytical Research
SN - 1639-4488
IS - 4
ER -