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Subrahmanyam, N. P., Leelanandam, C. (1991) Geochemistry and Petrology of the Cumulophyric Layered Suite of Rocks from the Toa Pluton of the Mundwara Alkali Igneous Complex, Rajasthan. Journal Geological Society of India, 38 (4). 397-411 doi:10.17491/jgsi/1991/380405

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Reference TypeJournal (article/letter/editorial)
TitleGeochemistry and Petrology of the Cumulophyric Layered Suite of Rocks from the Toa Pluton of the Mundwara Alkali Igneous Complex, Rajasthan
JournalJournal Geological Society of India
AuthorsSubrahmanyam, N. P.Author
Leelanandam, C.Author
Year1991 (October 1)Volume38
Page(s)397-411Issue4
PublisherGeological Society of IndiaPlaceBangaluru, India
URL
DOIdoi:10.17491/jgsi/1991/380405Search in ResearchGate
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Mindat Ref. ID18218468Long-form Identifiermindat:1:5:18218468:4
GUID0
Full ReferenceSubrahmanyam, N. P., Leelanandam, C. (1991) Geochemistry and Petrology of the Cumulophyric Layered Suite of Rocks from the Toa Pluton of the Mundwara Alkali Igneous Complex, Rajasthan. Journal Geological Society of India, 38 (4). 397-411 doi:10.17491/jgsi/1991/380405
Plain TextSubrahmanyam, N. P., Leelanandam, C. (1991) Geochemistry and Petrology of the Cumulophyric Layered Suite of Rocks from the Toa Pluton of the Mundwara Alkali Igneous Complex, Rajasthan. Journal Geological Society of India, 38 (4). 397-411 doi:10.17491/jgsi/1991/380405
In(1991, October) Journal of the Geological Society of India Vol. 38 (4). Geological Society of India
Abstract/NotesAbstract
The Toa layered suite ranges from feldspalhic peridotites to gabbros and gabbroic anorthosites. This suite differs from the Mer and MusaIa plutons in having coarse-grained cumulophyric rocks (with ubiquitous olivine) and scanty feldspathoidal dikes.
Observed features are traceable to the high H2O content and high H2O/CO2 ratio of the parental liquid. High H2O content has reduced the viscosity of the magma by many orders of magnitude and facilitated rapid crystallization and settling of crystals leading to the formation of coarse-grained cumulophyric suite of rocks. With its selective reactivity to Si-O-Si bridges, H2O has depressed the activities of the saturated components (ab, or and qz) in the magma and led to the crystallization of considerable amounts of olivine from the silica-undersaturated components and consequently of feldspars (instead of feldspathoids). The depression of the liquidus of albite has facilitated the crystallization of more calcic feldspars leading to the formation of gabbroic anorthosites. A model of pulsed emplacement of magma is proposed to account (1) for the differing H2O and CO2 contents of the parental liquids of the Musala, Mer and Toa plutons, and (2) for the three different trends of differentiation in the three plutons which gave rise to an amazing variety of rock types in the Mundwara Complex.

Map of Localities

Locality Pages

LocalityCitation Details
Mundwara, Sirohi district, Jodhpur Division, Rajasthan, India
Mer, Mundwara, Sirohi district, Jodhpur Division, Rajasthan, India
Musala, Mundwara, Sirohi district, Jodhpur Division, Rajasthan, India
Toa (Tua), Mundwara, Sirohi district, Jodhpur Division, Rajasthan, India

Mineral Occurrences

LocalityMineral(s)
Mundwara, Sirohi district, Jodhpur Division, Rajasthan, Indiaβ“˜ Aegirine, β“˜ Aegirine-augite, β“˜ Albite, β“˜ Alkali Feldspar, β“˜ Ankaramite, β“˜ Apatite, β“˜ Augite, β“˜ Baryte, β“˜ Calcite, β“˜ Carbonatite, β“˜ Dolerite, β“˜ Fayalite-Forsterite Series, β“˜ Feldspar Group, β“˜ Gabbro, β“˜ Granite, β“˜ Hawaiite, β“˜ K Feldspar, β“˜ Leucosyenite, β“˜ Magnesio-arfvedsonite, β“˜ Magnetite, β“˜ Melanocratic nephelinolite, β“˜ Mugearite, β“˜ Nepheline, β“˜ Olivine basalt, β“˜ Phonolite, β“˜ Picrite, β“˜ Pyrite, β“˜ Pyroxenite, β“˜ Quartz, β“˜ Richterite, β“˜ Shonkinite, β“˜ Sodalite, β“˜ Syenite, β“˜ Tetraferriphlogopite, β“˜ Theralite, β“˜ Tinguaite, β“˜ Titanite, β“˜ Titanium-bearing Augite, β“˜ Trachyte
Musala, Mundwara, Sirohi district, Jodhpur Division, Rajasthan, Indiaβ“˜ Alkali basalt, β“˜ Alkali Feldspar, β“˜ Amphibole Supergroup, β“˜ Augite, β“˜ Biotite, β“˜ Essexite, β“˜ Hawaiite, β“˜ K Feldspar, β“˜ Magnetite, β“˜ Melanocratic nephelinolite, β“˜ Melasyenite, β“˜ Mugearite, β“˜ Nepheline, β“˜ Phonolite, β“˜ Plagioclase, β“˜ Pseudoleucite, β“˜ Pyroxene Group, β“˜ Sodalite, β“˜ Syenite, β“˜ Titanium-bearing Augite
Toa (Tua), Mundwara, Sirohi district, Jodhpur Division, Rajasthan, Indiaβ“˜ Aegirine-augite, β“˜ Augite, β“˜ Biotite, β“˜ Fayalite-Forsterite Series, β“˜ Gabbro, β“˜ Kaersutite, β“˜ Leucite, β“˜ Plagioclase, β“˜ Pyroxenite, β“˜ Titanium-bearing Augite

See Also

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

Subrahmanyam, N. P., Rao, G. V. D. (1977) Petrography, Geochemistry and Origin of the Carbonatite Veins of Mer Pluton, Mundwara Igneous Complex, Rajasthan. Journal of the Geological Society of India, 18 (7). 306-322
Kochhar, Naresh, Vallinayagam, G., Gupta, L. N. (1991) Zircons from the Granitic Rocks of the Malani Igneous Suite : Morphological and Chemical Studies. Journal Geological Society of India, 38 (6). 561-576 doi:10.17491/jgsi/1991/380603
Madhavan, V., Leelanandam, C. (1988) Petrology of the Elchuru Alkaline Pluton, Prakasam District, Andhra Pradesh, India. Journal Geological Society of India, 31 (6). 515-537 doi:10.17491/jgsi/1988/310601
Hari, K. R., Santosh, M., Chatterjee, A. C. (1991) Primary Silicate-Melt Inclusions in Olivine Phenocrysts from the Pavagad Igneous Suite, Gujarat. Journal Geological Society of India, 37 (4). 343-350 doi:10.17491/jgsi/1991/370404
Fareedduddin, Sharma, A. K., Bose, U. (1991) Tectonic Slices of High-Grade Rocks in the Delhi Fold Belt of North-Central Rajasthan. Journal Geological Society of India, 38 (4). 427-436 doi:10.17491/jgsi/1991/380408
Adyalkar, P. G., Phadtare, P. N. (1972) Carbonatite Veins of Mundwara Igneous Complex, Rajasthan. Journal of the Geological Society of India, 13 (4). 382-387
Sahoo, K. C., Mathur, A. K. (1991) On the Occurrence of Sargur Type Banded Iron-Formation in Banded Gneissic Complex of South Rajasthan. Journal Geological Society of India, 38 (3). 299-302 doi:10.17491/jgsi/1991/380307
Radhakrishna, B. P. (1991) Learning Lessons from a Catastrophe. Journal Geological Society of India, 38 (1). 3-4 doi:10.17491/jgsi/1991/380104
Das, Nachiketa, Mackenzie, Angus B. (1991) Distribution and Geochemistry of Uranium in the Orcadian Rocks from Northeast Scotland: A Fission Track Study. Journal Geological Society of India, 38 (6). 599-604 doi:10.17491/jgsi/1991/380606
Mukherjee, Ananda Deb, Sen, Partha Pratim (1991) Compositional Variations in Mackinawites from the Chandmari Mine of Khetri Copper Belt, Rajasthan. Journal Geological Society of India, 38 (1). 96-100 doi:10.17491/jgsi/1991/380111
Rajshekhar, C. (1991) Foraminifera from the Nodular Limestone, Bagh Beds, Madhya Pradesh, India. Journal Geological Society of India, 38 (2). 151-168 doi:10.17491/jgsi/1991/380203
 
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