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Water-in-zircon: a discriminant between S- and I-type granitoid.
- Source :
-
Contributions to Mineralogy & Petrology . Jan2023, Vol. 178 Issue 1, p1-13. 13p. - Publication Year :
- 2023
-
Abstract
- Granitic rocks are crucial in revealing continental crust formation and evolution. The classic S- and I-type granitoid classification (based upon metasedimentary vs. metaigneous protolith) is widely adopted, but is not always straightforward when diagnostic minerals (e.g., cordierite for S-type and amphibole for I-type) are absent. In this study, zircon oxygen isotope and water content were measured simultaneously with Secondary Ion Mass Spectrometry (SIMS) on I- and S-type granitoids from various tectonic settings, including the New England Orogens (NEO), the Diancangshan–Ailaoshan and the Himalayan orogens, and the South China Block. Our results indicate the S-type samples are characterized by lower water-in-zircon content (median 14–170 ppm) than the I-type samples (median 449–885 ppm). Also, inherited I-type zircon cores in S-type samples from the NEO have higher water-in-zircon content than the zircon rims, confirming the different water content between the two granitoid types. We propose that water-in-zircon content is a potential tool to distinguish I- and S-type granitoids. Nonetheless, the low water-in-zircon content of S-type granitoids has likely no correlation with high magma water content. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00107999
- Volume :
- 178
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Contributions to Mineralogy & Petrology
- Publication Type :
- Academic Journal
- Accession number :
- 161769231
- Full Text :
- https://doi.org/10.1007/s00410-022-01986-7