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Title: Origin of the Sung Valley carbonatite complex, Meghalaya, India: Major element geochemistry constraints
Authors: Sen A.K.
Published in: Journal of the Geological Society of India
Abstract: The Sung Valley carbonatite complex is situated in the Shillong Plateau, Meghalaya and includes an array of silicate rocks along with sovitic carbonatite. The silicate rocks are represented by serpentinized peridotite, pyroxenite, melilitolite, ijolite and nepheline syenite and occupy more than 99% of the total outcrop. Variation in major element composition divides the silicate rocks into two distinct groups: i) alumina-alkali-poor, represented by peridotite, pyroxenite and melilitolite and ii) alumina-alkali-rich consisting of ijolite and nepheline syenite. Perceptible variation in chemical composition can also be noted among the individual group members. The carbonatite is dominantly CaCo3-rich and poor in alkalies. Present study suggests that the parent magma in the Sung Valley complex was of melilitic composition. In the initial stages this magma produced peridotite and pyroxenite by fractional crystallization. With progressive crystallization the parent magma gradually became enriched in Ca and generated carbonatitic melt by liquid immiscibility. The residual silicate melt, after separation of immiscible carbonate melt, produced ijolite and nepheline syenite by fractional crystallization.
Citation: Journal of the Geological Society of India (1999), 53(3): 285-297
Issue Date: 1999
Keywords: Alkaline Rocks
ISSN: 167622
Author Scopus IDs: 7401592446
Author Affiliations: Sen, A.K., Department of Earth Sciences, University of Roorkee, Roorkee - 247 667, U.P, India
Corresponding Author: Sen, A.K.; Department of Earth Sciences, University of Roorkee, Roorkee - 247 667, U.P., India
Appears in Collections:Journal Publications [ES]

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