Journal article
Inherited igneous zircons in jadeitite predate high-pressure metamorphism and jadeitite formation in the Jagua Clara serpentinite mélange of the Rio San Juan Complex (Dominican Republic)
Contributions to mineralogy and petrology, Vol.171(5), pp.1-26
05/03/2016
DOI: 10.1007/s00410-016-1256-6
Abstract
This study utilizes zircon SIMS U–Pb dating, REE and trace-element analysis as well as oxygen isotope ratios of zircon to distinguish jadeite-rich rocks that formed by direct crystallization from a hydrous fluid from those that represent products of a metasomatic replacement process. Zircon was separated from a concordant jadeitite layer and its blueschist host, as well as from loose blocks of albite-jadeite rock and jadeitite that were all collected from the Jagua Clara serpentinite-matrix mélange in the northern Dominican Republic. In the concordant jadeitite layer, three groups of zircon domains were distinguished based on both age as well as geochemical and oxygen isotope values: age groups
old
(117.1 ± 0.9 Ma),
intermediate
(three dates: 90.6, 97.3, 106.0 Ma) and
young
(77.6 ± 1.3 Ma). Zircon populations from the blueschist host as well as the other three jadeite-rich samples generally match zircon domains of the
old
age group in age as well as geochemistry and oxygen isotope ratios. Moreover, these
older
zircon populations are indistinguishable from zircon typical of igneous oceanic crust and hence are probably inherited from igneous protoliths of the jadeite-rich rocks. Therefore, the results suggest that all investigated jadeite-rich rocks were formed by a metasomatic replacement process. The
younger
domains might signal actual ages of jadeitite formation, but there is no unequivocal proof for coeval zircon-jadeite growth.
Details
- Title: Subtitle
- Inherited igneous zircons in jadeitite predate high-pressure metamorphism and jadeitite formation in the Jagua Clara serpentinite mélange of the Rio San Juan Complex (Dominican Republic)
- Creators
- Andreas Hertwig - University of Wisconsin–MadisonWilliam C McClelland - University of IowaKouki Kitajima - University of Wisconsin–MadisonHans-Peter Schertl - Ruhr University BochumWalter V Maresch - Ruhr University BochumKlaus Stanek - TU Bergakademie FreibergJohn W Valley - University of Wisconsin–MadisonSergey A Sergeev - St Petersburg University
- Resource Type
- Journal article
- Publication Details
- Contributions to mineralogy and petrology, Vol.171(5), pp.1-26
- Publisher
- Springer Berlin Heidelberg
- DOI
- 10.1007/s00410-016-1256-6
- ISSN
- 0010-7999
- eISSN
- 1432-0967
- Grant note
- EAR 1355590 / Directorate for Geosciences (http://dx.doi.org/10.13039/100000085) SCHE 517/10-1 / Deutsche Forschungsgemeinschaft (http://dx.doi.org/10.13039/501100001659)
- Language
- English
- Date published
- 05/03/2016
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984229170802771
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