Mineralogy of the baotite-bearing Gundrapalli lamproite, Nalgonda district, Telangana, India

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Marco E. Ciriotti
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Mineralogy of the baotite-bearing Gundrapalli lamproite, Nalgonda district, Telangana, India

Messaggio da Marco E. Ciriotti » ven 01 feb, 2019 10:24

Prossima pubblicazione.

Referenza:
▪ Kaur, G. & Mitchell, R.H. (2019): Mineralogy of the baotite-bearing Gundrapalli lamproite, Nalgonda district, Telangana, India. Mineralogical Magazine, 83, (in press).

Abstract:
We describe the mineralogy of a lamproite dyke from Gundrapalli village (Nalgonda district), Telangana, India. The dyke consists of a mineral assemblage characteristic of lamproites in terms of the presence of amphiboles (mainly potassic-richterite together with potassic-arfvedsonite, magnesio-riebeckite, Ti-rich potassic-magnesio-arfvedsonite, potassic-magnesio-arfvedsonite, katophorite and potassic-ferri-katophorite), Al-poor pyroxene, phlogopite (Ti-rich, Al-poor), pseudomorphed leucite, spinel (chromite-magnesiochromite), fluoroapatite, barite, titanite, rutile, baritocalcite, calcite, ilmenite, hydro-zircon, baotite, strontianite, allanite, quartz and pyrite. The absence of wadeite and priderite have been compensated for by presence of baotite, rutile, titanite, barite, and hydro-zircons. The presence of the secondary phases: allanite, hydro-zircon, chlorite, quartz, and cryptocrystalline silica, implies that the dyke has undergone deuteric alteration. The Gundrapalli dyke on the basis of its typomorphic mineralogy has been classified as a pseudoleucite-phlogopite-amphibole-lamproite. We report the presence of the rare mineral baotite from this lamproite, the first recognition of baotite from a lamproite in India. The mineralogy of the baotite- bearing Gundrapalli lamproite is analogous to the baotite- bearing Kvaløya lamproite from Troms, Norway.
Marco E. Ciriotti

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