Chinese science bulletin, 2007-11, Vol.52 (21), p.2995-3001
2007
Volltextzugriff (PDF)
Details
- Autor(en) / Beteiligte
- Titel
- Barite in omphacite-hosted K-feldspar ＋ quartz polycrystalline aggregates from the Sulu eclogites and its implications
- Ist Teil von
- Chinese science bulletin, 2007-11, Vol.52 (21), p.2995-3001
- Ort / Verlag
- Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
- Erscheinungsjahr
- 2007
- Beschreibungen/Notizen
- K-feldspar ＋ quartz polycrystalline aggregates were found as sub-millimeter-size inclusions with a pseudomorph after coesite （？） in omphacites from a number of Sulu eclogites. In these aggregates, round or subhedral barites occur as tiny inclusions in either K-feldspar or quartz. Energy dispersive spectroscopy （EDS） analyses show that these barites have （1） 33.86%--41.12% SO3, 0%--34.65% SrO, and 24.12%-63.55% BaO, （2） seemingly negative linear correlations between SrO and BaO, indicating that they are ideal solid solutions of barite （BaSO4） and celestite （SrSO4）, and （3） highly variable Sr/Ba molar ratios ranging from 0 to 2.1. Presence of barites in the Sulu eclogites not only indicates oxidation of the subducting continental crust, but also very limited and restricted fluids presented during exhumation of the Sulu UHP eclogites.