Abstract
Massive- and vein-type rodingites occurring in serpentinized peridotite of the Jinchan ultramafic body in the Ailaoshan ophiolite zone, S.W. China, have been investigated mineralogically and chemically. Rodingites of the massive-type consist of garnet, chlorite and diopside in rims, and garnet, diopside and subordinary chlorite in cores, while rodingites of the vein-type consist of garnet, chlorite and subordinary diopside. The garnet of the massive rodingites belongs essentially to the grandite-hydrograndite series, but extremely rich in TiO2: (Ca5.92Mg0.07)Σ5.99(Ti1.11Al0.44Fe1.112+Fe1.323+Cr0.02)Σ4.00(SiO4)5.78(O4H4)0.22. The petrography suggests that the rodingites were originally formed by metasomatism between titanium- and iron-rich and aluminum-poor rock and calcium-rich solution, and that they were deformed by the Ailaoshan metamorphism after the formation.
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