Original paper

Low-Th pyrochlore in carbonatite from the Amba Dongar carbonatite-alkaline complex, Gujarat, India

Ghose, Indraneel; Fialin, Michel; Kienast, Jean-Robert; Viladkar, Srinivas G.

Neues Jahrbuch für Mineralogie - Monatshefte Jg. 1997 Heft 1 (1997), p. 34 - 48

21 references

published: Mar 26, 1997

DOI: 10.1127/njmm/1997/1997/34

BibTeX file

ArtNo. ESP156199701002, Price: 29.00 €

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Abstract

Pyrochlore from coarse- and fine-grained calcite-carbonatites (sovite) in the Amba Dongar carbonatite-alkaline complex has been analyzed by electron microprobe. There is no systematic change in composition of pyrochlore of these two types of calcite-carbonatite. Two groups can, however, be distinguished based on thorium content, with Th-poor pyrochlore (average 2.24 %) concentrated in coarsegrained sovite and Th-rich pyrochlore (average 13-16 %) predominant in finegrained sovite. The pyrochlore is LREE enriched with a pronounced positive Ce anomaly.

Keywords

Pyrochlore • calcite-carbonatite • Amba Dongar • electron microprobe