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Barite in omphacite-hosted K-feldspar + quartz polycrystalline aggregates from the Sulu eclogites and its implications

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  • Geology
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Chinese Science Bulletin

Abstract

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 ecologites not only indicates oxidation of the subducting continental crust, but also very limited and restricted fluids presented during exhumation of the Sulu UHP eclogites.

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Authors and Affiliations

  1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

    Zeng LingSen, Liu FuLai, Liang FengHua & Chen FangYuan

Authors
  1. Zeng LingSen
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  2. Liu FuLai
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  3. Liang FengHua
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  4. Chen FangYuan
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Corresponding author

Correspondence to Zeng LingSen.

Additional information

Supported by “973” Project from the Ministry of Science and Technology of China (Grant No. 2003CB716504) and the National Natural Science Foundation of China (Grant No. 40673027)

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Zeng, L., Liu, F., Liang, F. et al. Barite in omphacite-hosted K-feldspar + quartz polycrystalline aggregates from the Sulu eclogites and its implications. CHINESE SCI BULL 52, 2995–3001 (2007). https://doi.org/10.1007/s11434-007-0403-x

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  • DOI: https://doi.org/10.1007/s11434-007-0403-x

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