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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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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004737 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004737_1
Genre: Journal Article

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

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Free keywords: antigorite, chrysotile, lizardite, oxygen isotopes, SHRIMP ion microprobe
 Abstract: 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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Language(s): eng - English
 Dates: 2018-06-042018-07-092018
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1111/ggr.12232
 Degree: -

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Title: Geostandards and Geoanalytical Research
Source Genre: Journal
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Pages: - Volume / Issue: 42 (4) Sequence Number: - Start / End Page: 459 - 479 Identifier: Publisher: Wiley