Abstract
The composition of pyrochlore from the calcite carbonatite and its associated laterite at Bingo, Zaïre was determined and compared with pyrochlore from the nearby and geologically-similar carbonatite at Lueshe. Large compositional variations exist in the Bingo pyrochlore which relate both to primary magmatic zonation and, more commonly, a secondary alteration process. Altered pyrochlore is rich in Ba and Si. At Lueshe an identical primary magmatic trend is observed, but secondary alteration is subordinate. Pyrochlore from the Bingo laterite is bariopyrochlore, whereas at Lueshe the predominant variety is kalipyrochlore.
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