Felsic Xenocryst in the Bedded Porcellanite (Mesoproterozoic) of the Central India: An Evidence Suggesting the Rhyolitic Source of Silica


Felsic xenocryst, porcellanite, Mesoproterozoic, central India, rhyolitic.

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Krishna Mondal, B. P. Singh. Felsic Xenocryst in the Bedded Porcellanite (Mesoproterozoic) of the Central India: An Evidence Suggesting the Rhyolitic Source of Silica. Glob. J. Earth Sci. Eng. [Internet]. 2017Dec.29 [cited 2022Jan.16];4(1):18-26. Available from: https://www.avantipublishers.com/jms/index.php/gjese/article/view/733


 The Mesoproterozoic porcellanite of the Vindhyan Super group is the oldest porcellanite deposit of India. Its origin is poorly understood in the absence of silica secreting organisms during Proterozoic times and earlier. Here, we interpret the origin and possible source of silica based on sedimentary structures and xenocryst occurring in these porcellanites. Lithofacies and related sedimentary structures suggest that the studied porcellanite precipitated in a shallow marine condition in the intracratonic Vindhyan basin. Four different facies types are recognised within the porcellanite; these are yellow, black, white and green chert / porcellanite. Based on physical characteristics, it is suggested that the black and green porcellanites are chert and yellow and white porcellanites are either rhyolite or porcellanie.ellow and white porcellanite are either rhyolite or porcellanite. The presence of felsic xenocryst, including sanidine, encased within the microcrystalline and cryptocrystalline quartz suggests that the source of silica was a rhyolite. The quartz of the felsic volcanic rock (rhyolite) was dissolved in the seawater during alkaline pH created by the presence of phytoplanktons and the dissolved silica got precipitated in the form of bedded chert and porcellanite during lowering of the pH coupled with the evaporation of the seawater. The intermittent supply of the clay as impurities in the silica originated true porcellanite in the present case.


Keene JB. Cherts and Porcellanites from the North Pacific, DSDP Leg 32, in Larson, R.L., Moberly RJ., et al. eds., Initial Reports DSDP, 32. Washington (U.S. Government Printing Office) 1975; 429-507. https://doi.org/10.2973/dsdp.proc.32.114.1975

Hesse R. Silica diagenesis: origin of inorganic and replacement cherts. Earth Sci Rev 1988; 26: 253-284. https://doi.org/10.1016/0012-8252(89)90024-X

Behl RJ and Smith BM. Silicification of Deep-Sea Sediments and the Oxygen Isotope Composition of Diagenetic Siliceous Rocks from the Western Pacific, Pigafetta and East Mariana Basins, Leg 129, in Larson, R. L., Lancelot, Y., et al. eds., Proceedings of the Ocean Drilling Program, Scientific Results 1992; 129: 81-117.

Auden JB. Vindhyan Sedimentation in the Son Valley, Mirzapur district. Mem Geol Surv India, Spec Publ 1933; 62: 141-250.

Srivastava RN, Srivastava AK, Singh KN and Redcliffe RP. Sedimentation and depositional environment of the Chopan Porcellanite Formation, Semri Group, Vindhyan Supergroup in parts of Sonbhadra district, Uttar Pradesh. J Paleontol Soc India 2003; 48: 167-179.

Mohan K and Raju KNP. Some evidences on tectonics of Vindhyans: A research note. National Geograph Jour India 2007; 53(3-4): 103-106.

Singh CK, Mohan K and Singh BP. Penecontemporaneous deformational structures in Glauconitic Sandstone, Semri Group (Vindhyan Supergroup), Sonbhadra District, Uttar Pradesh, India and their structural analysis. Glob Jour Earth Sci Eng 2014; 1: 43-48. https://doi.org/10.15377/2409-5710.2014.01.01.5

Mehrotra MN and Banerjee R. A study of the Son Porcellanite Formation (Lower Vindhyan) around Kunjhur District Sidhi, Madhya Pradesh. Geol Asso Indian Bull 1983; 16(1): 13-20.

Mehrotra MN, Banerjee R, Datela RK and Lal P. The Son Porcellanite Formation: An example of volcaniclastic sedimentation in India. J Earth Sci 1985; 12(1): 21-33.

Mishra M and Sen S. Geochemistry and origin of Proterozoic porcellanitic shales from Chopan, Vindhyan basin, India. Indian J Geol 2010; 80: 157-171.

Ray JS, Martin MW, Veizer J and Bowing SA. U-Pb zircon dating and Sr isotope systematic of the Vindhyan Supergroup, India. Geology 2002; 30(2): 131-134. https://doi.org/10.1130/0091- 7613(2002)030<0131:UPZDAS>2.0.CO;2

Lindholm RC. A Practical Approach to Sedimentology. CBS Publishers 1987; p. 276. https://doi.org/10.1007/978-94-011-7683-5

Pal T and Deb M. Chert association in the mineralized zone of the Proterozoic Dariba- Rajpura- Bethumni belt, Rajasthan: an oxygen isotope study and its implications. Curr Sci 2013; 105(1): 91-96.

Jones PA and Omoto Q. Towards establishing criteria for identifying trigger mechanisms for soft-sediment deformation: a case study of Late Pleistocene lacustrine sands and clays, Onikobe and Nakayamadaira Basins, northeastern Japan. Sedimentology 2000; 47: 1211-1226. https://doi.org/10.1046/j.1365-3091.2000.00355.x

Singh BP and Srivastava AK. Storm activities during sedimentation of the Late Paleocene- Middle Eocene Subathu Formation, western Himalayan Foreland basin 2011; 77: 130-136.

Bose PK, Banerjee S and Sarkar S. Slope-controlled seismic deformation and tectonic framework of deposition: Koldaha shale, India. Tectonophysics 1997; 269: 151-169. https://doi.org/10.1016/S0040-1951(96)00110-2

Roep TB and Everts AJ. Pillow-beds: a new type of seismites? An example from an Oligocene turbidite fan complex, Alicante, Spain. Sedimentology 1992; 39: 711-724. https://doi.org/10.1111/j.1365-3091.1992.tb02148.x

Reineck HE and Singh IB. Depositional Sedimentary Environments With Reference to Terrigenous Clastics. Springer- Verlag, Berlin 1973; p. 439.

Tucker ME. Sedimentary Petrology, An Introduction. Blackwell Scientific Publications 1981; p. 252.

Wang J, Chen D, Wang D, Yan D, Zhou X, et al. Petrology and geochemistry of chert on the marginal zone of Yangtze Platform, western Hunan, South China, during the Ediacaran-Cambrian transition. Sedimentology 2012; 59: 809-829. https://doi.org/10.1111/j.1365-3091.2011.01280.x

Sharapov VN, Tamilenko AA, Smirnov SZ, Sharygin VV and Kovyazin SV. Rhyolite Xenolith from the Neovolcanic Basalts of the Rift Valley of the Juan De Fuca Ridge, Northeastern Pacific: Reconstruction of Crystallization Conditions and Interaction between MOR Silicic Rocks and Basic Magmas. Petrology, 2013; 21(5): 427-453. https://doi.org/10.1134/S0869591113050044

Lisitzin AP. Sedimentation in the World Ocean. Spec Publ Econ Paleontol Mineralo, Tulsa 1972; 17: 218. https://doi.org/10.2110/pec.72.17

Bickford ME, Saha D, Schieber J, Kamenov G, Russell A, et al. New U-pb ages of zircon in the Owk Shale (Kurnool Group) with reflections on Proterozoic porcellanites in India. Jour Geol Soc India 2013; 82: 207-216. https://doi.org/10.1007/s12594-013-0143-2

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