Compositional variation in pyrochlores of Amba Dongar carbonatite complex,Gujarat |
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| Authors: | Shrinivas G. Viladkar Ulrich Bismayer |
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| Affiliation: | (1) Speewah Fluorite-Carbonatite Research Project, c/o NiPlats Australia Limited, 22/77 Allendale Square, St Georges Terrace, Perth, WA, 6000, Australia;(2) Institute for Geochemical Research, Hungarian Academy of Sciences, Budaorsi ut 45, Budapest, 1112, Hungary;(3) Centre for Exploration Targeting, School of Earth & Environment, The University of Western Australia, Nedlands, WA, 6009, Australia;(4) Department of Earth and Planetary Sciences, Birkbeck College, University of London, Malet Street, London, WC1E 7HX, UK;(5) Department of Earth and Planetary Sciences, Western Australian Museum, Locked Bag 49, Welshpool DC, WA, 6986, Australia |
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| Abstract: | Pyrochlore is interpreted as a primary magmatic mineral that appeared in early carbonatite phases at Amba Dongar. Later intrusive phases incorporated this early pyrochlore and caused compositional modification, particularly around the rims, in response to changing magma chemistry. Consequently pyrochlore compositions show wide ranges in Nb, Ta, Ca, Ba, Ti and Ce. The final carbonatite phase was ankeritic and rich in hydrothermal fluids, giving rise to extreme compositional zoning and introduction of diverse elements (Si, U, Sr, Th, Fe), in the contained pyrochlore. Enrichment in radioelements such as U lead to metamictization, alteration and A-site vacancy. |
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