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

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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

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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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