Chemistry and origin of chloritoid rocks from eastern Taiwan |
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| Authors: | JG Liou Pei-Yuan Chen |
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| Institution: | 1. Department of Geology, Stanford University, Stanford, California 94305, USA;2. Department of Geology, National Taiwan University, Taipe, Republic of China |
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| Abstract: | Chloritoid-rich rocks occur as thin pods or lenses in the well-foliated marble and greenschist of the pre-Tertiary metamorphic complex of eastern central Taiwan. They contain unusually abundant chloritoid: 60–90% in the massive rocks and 30–50% in the schistose rocks. Compared to the adjacent basaltic greenschist, the chloritoid rocks contain extremely low SiO2, CaO and Na2O and very high Al2O3, total Fe as Fe2O3, and TiO2. Both monoclinic and triclinic chloritoids were identified. These rocks may have been derived originally from fossil lateritic soils formed from a basaltic layer in a limestone terrain. These soils and the bedded rocks were then metamorphosed in the chlorite-biotite zone of the greenschist facies. |
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