The comparability of carbonatitic fluid inclusions in ijolites with natrocarbonatite lava |
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| Authors: | M J Le Bas J A Aspden |
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| Institution: | 1. Department of Geology, University of Leicester, LE1 7RH, UK
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| Abstract: | The composition of carbonate, sulphate, halide and other phases trapped as fluid inclusions in apatite crystals in ijolite and urtite from sub-volcanic complexes in East Africa have been determined using the electron micro-probe. The bulk composition of these inclusions is alkali-rich and closely comparable to the natrocarbonatite lava from the active volcano of Oldoinyo Lengai in N. Tanzania. The inclusions are interpreted as having been originally immiscible alkali carbonate-rich droplets within a nephelinitic melt. The evidence suggests that magma of the composition of natrocarbonatite lava is that most likely for the parent magma during carbonatite petrogenesis. |
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