Alkali amphiboles intermediate in composition between actinolite and riebeckite |
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Authors: | Christos Katagas |
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Institution: | (1) Department of Geology, The University of Manchester, M13 9PL Manchester, England |
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Abstract: | Alkali amphiboles of an intermediate composition in the magnesioriebeckite-eckrite series have been found in the metamorphic terrane of Leros Island. A complete compositional gradation has been demonstrated by a series of electron microprobe scans and analyses of spots. Electron microscopic examination revealed no exsolution.The present analyses and other data indicate a closing of the Na-Ca amphiboles gap towards the magnesian end members at temperatures higher than that usually associated with the blueschist facies. |
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