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

H. M. Rajesh; M. Santosh

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

H. M. Rajesh, M. Santosh

Earth & Environmental Sciences

Research output: Contribution to journal › Article

6 Citations (Scopus)

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.

Original language	English
Pages (from-to)	637-646
Number of pages	10
Journal	Journal of the Geological Society of India
Volume	48
Issue number	6
Publication status	Published - Dec 1996

All Science Journal Classification (ASJC) codes

Earth and Planetary Sciences (miscellaneous)
Earth and Planetary Sciences(all)
Environmental Science(all)

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Rajesh, H. M., & Santosh, M. (1996). Fluorapatite from alkaline pegmatites of the Kerala Khondalite Belt: A petrologic and fluid inclusion study. Journal of the Geological Society of India, 48(6), 637-646.

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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.",

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