Fluorapatite from alkaline pegmatites of the Kerala Khondalite Belt: A petrologic and fluid inclusion study

Journal article

Authors / Editors

Rajesh, Hariharan

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Publication Details

Author list: Rajesh HM, Santosh M

Publisher: Springer

Place: BANGALORE

Publication year: 1996

Journal: Journal of the Geological Society of India (0016-7622)

Journal acronym: J GEOL SOC INDIA

Volume number: 48

Issue number: 6

Start page: 637

End page: 646

Number of pages: 10

ISSN: 0016-7622

eISSN: 0974-6889

Languages: English-Great Britain (EN-GB)

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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-H2O 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

fluid inclusion, fluorapatite, Kerala Khondalite Belt, pegmatites, petrology

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