Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

H. M. Rajesh ¹, M. Santosh ¹

Affiliations
1 Centre for Earth Science Studies. PB 7250, Akkulam, Thuruvikkal Post, Trivandrum - 695 031, IN

Abstract

We report the occurrence of primary apatite crystals in association with graphite within alkaline pegmatite dykes in the Kerala Khondalite Belt (KKB). Petrologic and X-ray diffraction studies identify the mineral to be fluorapatite. Fluid inclusion studies show that the fluorapatites contain abundant CO₂-rich inclusions with densities in the range of 0.85-0.72 gcm^-3. A subsequent generation of trail-bound CO₂-HP inclusions with low salinity were entrapped along hydraulic cracks. The abundance of CO₂-rich inclusions, and the intimate association of fluorapatite with fluid-precipitated graphite suggest that the pegmatite dykes hosting fluorapatite were rich in CO₂-dominated fluids. We identify that among the magmatic conduits proposed for the transfer of CO₂-rich fluids in granulite processes in the KKB. the fluorapatite and graphite bearing pegmatites reported in this study form important examples.

Keywords

Petrology, Fluorapatite, Pegmatites, Fluid inclusion, Kerala Khondalite Belt.

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George A. Belyanin , H. M. Rajesh

Abstract

No Abstract.

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