Water-in-zircon: a discriminant between S- and I-type granitoid

Author(s)
Mo, Jing
Xia, Xiao-Ping
Li, Peng-Fei
Spencer, Christopher J
Lai, Chun-Kit
Xu, Jian
Yang, Qing
Sun, Ming-Dao
Yu, Yang
Milan, Luke
Publication Date
2023-01-02
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.
Citation
Contributions to Mineralogy and Petrology, 178(1), p. 1-13
ISSN
1432-0967
0010-7999
Link
Publisher
Springer
Title
Water-in-zircon: a discriminant between S- and I-type granitoid
Type of document
Journal Article
Entity Type
Publication

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