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  In Situ Oxygen Isotope Determination in Serpentine Minerals by Ion Microprobe: Reference Materials and Applications to Ultrahigh-Pressure Serpentinites

Scicchitano, M. R., Rubatto, D., Hermann, J., Shen, T., Padrón-Navarta, J. A., Williams, I. S., Zheng, Y.-F. (2018): In Situ Oxygen Isotope Determination in Serpentine Minerals by Ion Microprobe: Reference Materials and Applications to Ultrahigh-Pressure Serpentinites. - Geostandards and Geoanalytical Research, 42, 4, 459-479.
https://doi.org/10.1111/ggr.12232

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 Urheber:
Scicchitano, Maria Rosa1, Autor              
Rubatto, Daniela2, Autor
Hermann, Jörg2, Autor
Shen, Tingting2, Autor
Padrón-Navarta, José Alberto2, Autor
Williams, Ian S.2, Autor
Zheng, Yong-Fei2, Autor
Affiliations:
10 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              
2External Organizations, ou_persistent22              

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Schlagwörter: antigorite, chrysotile, lizardite, oxygen isotopes, SHRIMP ion microprobe
 Zusammenfassung: We present the first investigation of in situ oxygen isotopes in serpentine minerals by sensitive high‐resolution ion microprobe (SHRIMP). Chemically homogeneous samples of antigorite (δ18O = 8.30 ± 0.12‰), chrysotile (δ18O = 4.37 ± 0.02‰) and lizardite (δ18O = 5.26 ± 0.20‰) analysed by laser fluorination are identified as potential reference materials. They were analysed by SHRIMP to assess their homogeneity compared with the San Carlos olivine, as well as for potential matrix bias and crystal orientation effects. The reproducibility achieved for all samples was ± 0.30–0.55‰ (95% confidence level). Matrix bias between antigorite/olivine and antigorite/lizardite was up to ~ +3‰ and −1‰, respectively. Crystal orientation effects were identified only in chrysotile, and no matrix bias was observed over the investigated compositional range within each serpentine mineral. The new reference materials were used to measure the oxygen isotope composition of serpentines in an ultrahigh‐pressure metamorphic belt from Tianshan (China). By combining oxygen isotopes and trace element microanalyses, several stages of serpentinisation were recognised: (a) seafloor alteration, (b) recycling of internal metamorphic fluids during isothermal decompression and (c) shallow interaction with meteoric water during exhumation. No interaction with fluids derived from the surrounding metapelites during subduction was identified.

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Sprache(n): eng - Englisch
 Datum: 2018-06-042018-07-092018
 Publikationsstatus: Final veröffentlicht
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 Inhaltsverzeichnis: -
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 Identifikatoren: DOI: 10.1111/ggr.12232
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Titel: Geostandards and Geoanalytical Research
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 42 (4) Artikelnummer: - Start- / Endseite: 459 - 479 Identifikator: Publisher: Wiley