Fluorapatite from alkaline pegmatites of the Kerala Khondalite Belt

A petrologic and fluid inclusion study

H. M. Rajesh, M. Santosh

    Research output: Contribution to journalArticle

    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 languageEnglish
    Pages (from-to)637-646
    Number of pages10
    JournalJournal of the Geological Society of India
    Volume48
    Issue number6
    Publication statusPublished - Dec 1996

    Fingerprint

    khondalite
    fluorapatite
    fluid inclusion
    graphite
    pegmatite
    fluid
    granulite
    apatite
    crack
    X-ray diffraction
    crystal
    hydraulics
    salinity
    mineral

    All Science Journal Classification (ASJC) codes

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

    Cite this

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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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    Fluorapatite from alkaline pegmatites of the Kerala Khondalite Belt : A petrologic and fluid inclusion study. / Rajesh, H. M.; Santosh, M.

    In: Journal of the Geological Society of India, Vol. 48, No. 6, 12.1996, p. 637-646.

    Research output: Contribution to journalArticle

    TY - JOUR

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    T2 - A petrologic and fluid inclusion study

    AU - Rajesh, H. M.

    AU - Santosh, M.

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    AB - 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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