Abstract
Corundum-rich garnetite occurs as an isolated lens in a garnet peridotite body in the Donghai area of the Sulu ultrahigh-pressure (UHP) terrane. This rock consists of garnet and corundum, along with minor crack-related zoisite, pargasite, Mg-staurolite, Mg-chloritoid, sapphirine and chlorite. Pyropic garnet (Prp54–63Grs26–36Alm10–12) exhibits a sinusoidal REE pattern, positive Ta, Pb, and negative Nb, Ti anomalies due to metasomatism. Reddish corundum contains 1.1–1.7 wt% Cr2O3, and shows three oriented sets of exsolved rutile needles. Both garnet and corundum contain inclusions of apatite, Mg-allanite (MgO>4 wt%), and Ni-Fe sulfides formed as trapped Ni-Fe-S melt. The protolith of the corundum-rich garnetite could have been spinel websterite formed in the upper mantle. Both the websterite and the host garnet peridotite were subjected to subduction-zone UHP metamorphism at ≥800 °C and >4 GPa. Crack-related hydrous phases were formed by fluid infiltration during exhumation.
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Acknowledgements
This research was supported by NSF grant EAR-0003355. We thank D. Rumble, Suzanne Y. O’Reilly, and W. L. Griffin for their laboratory support in oxygen isotope and trace elements analyses, respectively. We also thank Tatsuki Tsujimori for enlightening discussions, and W. G. Ernst, D. Smith and an anonymous scientist for a critical review of this manuscript.
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Zhang, R.Y., Liou, J.G. & Zheng, J.P. Ultrahigh-pressure corundum-rich garnetite in garnet peridotite, Sulu terrane, China. Contrib Mineral Petrol 147, 21–31 (2004). https://doi.org/10.1007/s00410-003-0545-z
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DOI: https://doi.org/10.1007/s00410-003-0545-z