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Krishnamurthy, P. (1985) Petrology of the Carbonatites and Associated Rocks of Sung Valley, Jaintia Hills District, Meghalaya, India. Journal of the Geological Society of India, 26 (6). 361-379

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Reference TypeJournal (article/letter/editorial)
TitlePetrology of the Carbonatites and Associated Rocks of Sung Valley, Jaintia Hills District, Meghalaya, India
JournalJournal of the Geological Society of India
AuthorsKrishnamurthy, P.Author
Year1985 (June)Volume26
Page(s)361-379Issue6
PublisherGeological Society of IndiaPlaceBangaluru, India
Classification
Not set		LoC
Not set
Mindat Ref. ID17742786Long-form Identifiermindat:1:5:17742786:4
GUID0
Full ReferenceKrishnamurthy, P. (1985) Petrology of the Carbonatites and Associated Rocks of Sung Valley, Jaintia Hills District, Meghalaya, India. Journal of the Geological Society of India, 26 (6). 361-379
Plain TextKrishnamurthy, P. (1985) Petrology of the Carbonatites and Associated Rocks of Sung Valley, Jaintia Hills District, Meghalaya, India. Journal of the Geological Society of India, 26 (6). 361-379
In(1985, June) Journal of the Geological Society of India Vol. 26 (6). Geological Society of India
Abstract/NotesIn Sung Valley, (Lat : 25Β°31' -25Β°36'N : Long; 92Β°05' -92Β°10'E) the Shillong Series rocks comprising mainly quartzites and phyllites are intruded by a N-S trending, roughly oval shaped body of pyroxenite covering an area of about 35 km2 and into which the following genetically related rock types have been emplaced in order of decreasing age and abundance. Peridotites (stock-like bodies), ijolites (ring dyke and plug like), carbonatites (incomplete cone sheets) and syenites (sheets, dykes and veins). Minor dykes and veins of magnetite-serpentine rock, ijolite and melilite-bearing types with a rough radial disposition are also present. Fenitization, due to both ijolites and carbonatites, has affected older rocks resulting in wollastonite-rich aegirine-augite bearing rocks, K-feldspar-aegirine-augite veins and oversaturated potassic syenites.

Carbonatites are mainly sovites with minor beforsite and types rich in magnetite and apatite are present. Average abundances of trace elements (values in ppm) characterizing carbonatites such as Bu (549), Sr (3134), La (50-100), Ce (489), Y (50), Nb (372), Zr (179) and P2O5 (5.7) wt% are comparable to those found in reported intrusive carbonatites. The weathered mantle of the carbonatites and the contact zones between carbonatites and pyroxenites have resulted in soils rich in pyrochlore, apatite and magnetite. It is postulated that the carbonatites may be differentiates of an ijolitic magma, in turn derived (liquid immiscibility?) from a parental mela-nephelinite or alkali picritic magma. The ultramafic suite could represent the cumulates from such a picritic source.

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LocalityCitation Details
Sung Valley complex, East Khasi Hills District, Meghalaya, India

Mineral Occurrences

LocalityMineral(s)
Sung Valley complex, East Khasi Hills District, Meghalaya, Indiaβ“˜ Aegirine, β“˜ Aegirine-augite, β“˜ Albite, β“˜ Amphibole Supergroup, β“˜ Analcime, β“˜ Andradite, β“˜ Apatite, β“˜ Calcite, β“˜ Cancrinite, β“˜ Carbonatite, β“˜ Clinohumite, β“˜ Clinopyroxene Subgroup, β“˜ Diopside, β“˜ Dolomite, β“˜ Fayalite-Forsterite Series, β“˜ Feldspar Group, β“˜ Fenite, β“˜ Fluorite, β“˜ Garnet Group, β“˜ Hercynite, β“˜ Ijolite, β“˜ K Feldspar, β“˜ Magnetite, β“˜ Melanite, β“˜ Melilite Group, β“˜ Mica Group, β“˜ Monazite Group, β“˜ Monticellite, β“˜ Nepheline, β“˜ Nepheline-syenite, β“˜ Nosean, β“˜ Orthoclase, β“˜ Peridotite, β“˜ Perovskite, β“˜ Perthite, β“˜ Phlogopite, β“˜ Phyllite, β“˜ Pyrochlore Group, β“˜ Pyroxene Group, β“˜ Pyroxenite, β“˜ Quartz, β“˜ Quartzite, β“˜ Richterite, β“˜ Schist, β“˜ Serpentine Subgroup, β“˜ Syenite, β“˜ Titanite, β“˜ Uncompahgrite, β“˜ Wollastonite

See Also

These are possibly similar items as determined by title/reference text matching only.

Sarkar, Kripamoy (2016) Rock slope analysis along NH-44 in Sonapur Area, Jaintia Hills District, Meghalaya. Journal of the Geological Society of India, 88 (1) 121-122 doi:10.1007/s12594-016-0466-x
Veena, K., Pandey, B. K., Krishnamurthy, P., & Gupta, J. N. (1998). Pb, Sr and Nd isotopic systematics of the carbonatites of Sung Valley, Meghalaya, northeast India: Implications for contemporary plume-related mantle source characteristics. Journal of Petrology, 39(11-12), 1875-1884.
Rahman, S. (1985) Petrochemistry of the Mylliem Granite, Khasi Hills., Meghalaya. Journal of the Geological Society of India, 26 (5). 356-359
Chaudhuri, Srinanda, Saha, Rajarshi, Ray, Jyotisankar, Bhaduri, S. K. (2009) Mawpyut intrusive complex of Jaintia hills district, Meghalaya, northeastern India: A case study for magmatic differentiation. Journal of the Geological Society of India, 74 (3) 385-394 doi:10.1007/s12594-009-0139-0
Veena, K., Pandey, B. K., Krishnamurthy, P., Gupta, J. N. (1998) Pb, Sr and Nd Isotopic Systematics of the Carbonatites of Sung Valley, Meghalaya, Northeast India: Implications for Contemporary Plume-Related Mantle Source Characteristics. Journal of Petrology, 39 (11) 1875-1884 doi:10.1093/petroj/39.11-12.1875
Umrao, Ravi Kumar, Sardar, Subrata Kumar (2022) Significant Occurrences of REE in Tertiary Sequence of East Jaintia Hills, Meghalaya, India. Journal of the Geological Society of India, 98 (5) 621-626 doi:10.1007/s12594-022-2036-8
Sarkar, Kripamoy, Buragohain, Bhritashree, Singh, T. N. (2016) Rock slope stability analysis along NH-44 in Sonapur area, Jaintia hills district, Meghalaya. Journal of the Geological Society of India, 87 (3) 317-322 doi:10.1007/s12594-016-0398-5
Krishnamurthy, P. (2021) Carbonatites and Related Alkaline Rocks with Special Reference to India. Journal of the Geological Society of India, 97 (5) 557 doi:10.1007/s12594-021-1722-2
Satsangi, P. P., Changkakoti, U. N. (1989) Fossil Decapod Crustacea from Upper Sylhet (Prang) Limestone of Jaintia Hills, Meghalaya. Journal Geological Society of India, 34 (3). 277-281 doi:10.17491/jgsi/1989/340306
Krishnamurthy, P. (2019) Carbonatites: Enigmatic Magmatic Rocks, with Special Reference to India. Journal of the Geological Society of India, 93 (5) 622 doi:10.1007/s12594-019-1207-8
Krishnamurthy, P. (1971) Petrology of the dyke rocks of the western portions of Rajpipla hills, Broach district, Gujarat, India. Bulletin Volcanologique, 35 (4). 930-946 doi:10.1007/bf02596855
 
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