Potassium loss during metasomatic alteration of mica pyroxenite from Oldoinyo Lengai,northern Tanzania: contrasts with fenitization |
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| Authors: | J B Dawson J V Smith |
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| Institution: | (1) Grant Institute of Geology, University of Edinburgh, West Mains Road, EH9 3JW Edinburgh, Scotland, UK;(2) Department of the Geophysical Sciences, University of Chicago, 60637 Chicago, IL, USA |
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| Abstract: | Mica pyroxenite xenoliths, occurring as the cores of nephelinite and ijolite bombs in the pyroclastic deposits of the active volcano Oldoinyo Lengai, have undergone metasomatism in which K was lost and Fe2+ and Ti gained. This is unlike the alkali and ferric iron addition that typifies most examples of metastomatism adjacent to peralkaline igneous rocks in carbonatite complexes. |
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