Volume 15, Issue 10 · IJARST · ISSN 2319-1783 / 2320-1126

Petrology and Geochemistry study of the new finding of Shoshonitic lamprophyre from South of Polshettigudem, Khammam District, Eastern Dharwar Craton, South India

Petrology and Geochemistry study of the new finding of Shoshonitic lamprophyre from South of Polshettigudem, Khammam District, Eastern Dharwar Craton, South India is an open-access, peer-reviewed research paper by Debapriya Adhikary and ChinchuS.V, published in Volume 15, Issue 10 of the International Journal of Advanced Research in Science and Technology (IJARST), a UGC-approved journal (Print ISSN 2319-1783, Online ISSN 2320-1126).

Author

Debapriya Adhikary and ChinchuS.V

Abstract

Lamprophyre dykes are widely distributed in the Eastern Dharwar Craton (EDC) of southern India. The present communication reports a new lamprophyre dyke occurrence south of Polshettigudem village, Khammam District, Telangana (80° 09' 59.10": 17° 21' 58.95"). The petrography and geochemistry of the newly identified lamprophyre are also covered in this communication. The study area is predominantly composed of granitoids belonging to the Peninsular Gneissic Complex-II (PGC-II) of the EDC. The granitoids of the EDC have intruded by lamprophyre of the study region. Petrographic studies indicate that the lamprophyre exhibits a porphyritic-panidiomorphic texture. The lamprophyres contain phenocrysts of amphibole, biotite, and clinopyroxene. These dykes have a groundmass of spinel, chromite, plagioclase feldspar, and biotite. The lamprophyre is characterised by SiO2 (49.87%-50.62%), Fe2O3 (9.46%-9.56%), MgO (10.34%-11.06%), CaO (7.76%-7.93%), K2O (3.55%-3.62%), TiO2 (1.28%-1.32%), and Al2O3 (11.28%-11.94%). Similarly, the lamprophyre's trace element examination reveals that it has greater concentrations of Ba (3799 ppm), Sr (1667 ppm), Ni (1056 ppm), Zr (498 ppm), V (187 ppm), and Cr (1374 ppm). The total REE content of the samples exceeds 1000 ppm, and the rock is enriched in LREEs. It is evident from geochemistry and petrology research that this lamprophyre is classified as a member of the Shoshonitic lamprophyre group.

Keywords: Polshettigudem lamprophyre, Eastern Dharwar Craton (EDC), Shoshonitic Lamprophyre

DOI: https://doi.org/10.62226/ijarst20262830

 

References:

AdhikaryD.,Mukherjee,S and Sahoo R(2022):Lamprophyre cluster within the granite terrain adjoining the western margin of Proterozoic Pakhal basin, Southern India.Indian  Journal of Geosciences. Volume 76,No.1. Page 1-12.

Adhikary,D;  and S.V Chinchu (2024): Petrology and Geochemical study of calc-alkaline lamprophyre from Garla area, North of Khammam, Eastern Dharwar Craton, South India. Indian Journal of Geosciences. Volume 78,No.4.Page 503-516.

Appavadhanulu,K.(1971):A short note on the lamprophyre dykes in parts of khammam district, Andhra Pradesh. Indian Minerals 25, 387-398.

ChalapathiRao, N.V.(2008) Precambrian alkaline potassic–ultra- potassic, mafic–ultramafic magmatism in peninsular India. Journal of Geological Society of India, 72, 57–84.

Ferguson, J and Currie, K L(1971): Evidance of Liquid Immiscibility in Alkaline ultrabasic dyke at CallanderBay,Ontario.Journal of Petrology 12,561–585.

Hirschmann, M.M.,Ghiorso, M.S and Stolper, E.M (1999):Calculation of peridotite partial melting from thermodynamic models of minerals and melts.II. Isobaric variations in the melt near the solidus and owing to variable source composition.Journal of Petrology 40,297–313.

Jiang,Y.–H.,Jiang,S.–Y.andLing,H.–F. (2010) Petrogenesis and tectonic implications of Late Jurassic shoshonitic lampro- phyre dikes from the Liaodong Peninsula, NE China. Miner-alogy and Petrology, 100, 127–151.

Kumar, K.V and Rathna, K (2008):Geochemistry of the mafic dykes in the Prakasam Alkaline Province of Eastern Ghats Belt, India: Implications for the genesis of continental rift-zone magmatism.Lithos 104,306–326.

Leake,B.E.etal.,1997.Nomenclatureofamphiboles:reportofthesubcommiteeonamphiboles of the international mineralogical association, commission on new minerals and mineral names.Am.Mineral.82,1019–1037.

Lefebvre, N.,Kopylova, M and Kivi, K (2005):Archaean calcalkaline lamprophyres of Wawa, Ontario, Canada: Unconventional diamondiferous volcaniclasticrocks.Precambrian Research 138,57–87.

Madhavan, V., David, K.,Mallikharjuna Rao, J.,Chalapathi Rao, N.V and Srinivas,M(1998):Comparative study of lamprophyres from the Cuddapah Intrusive Province (CIP) of Andhra Pradesh,India.Geological Society of India52,621–642.

Meshram, T. M., Shukla, D and Behera, K.K(2015):Alkaline lamprophyre (camptonite) from Bayyaram area, NE margin of the Eastern Dharwar Craton, southern India. Current Science 109 (10–11), 1931–1934.

Nakamura (1974):Determination of REE, Ba, Fe, Mg, Na & K in carbonaceous and ordinary chondrites.Geochimice et CosmochimiceActa 38(5),757-775.

Pandey, A.,Chalapathi Rao, N.V., Pandit,D.,Pankaj,P.,Pandey,R., Sahoo,S and Kumar, A (2017a):Subduction – Tectonics in the evolution of the eastern Dharwar craton, southern India: Insights from the post-collisional calc-alkalinelam- prophyres at the western margin of the Cuddapahbasin.Precambrian. Research 298, 235–251.

Pandey, A.,ChalapathiRao,  N.V.,  Chakrabarti,R.,Pandit,D.,Pankaj,P.,Kumar,A and Sahoo,S (2017b):Petrogen- esis of a Mesoproterozoic shoshonitic lamprophyre dyke from the Wajrakarurkimberlite field, eastern Dharwar craton, southern India: Geochemical and Sr–Nd isotopic evidence for a modified sub-continental lithospheric man-tlesource.Lithos.292–293.

Pearce, J. A and Cann, J.R(1973):Tectonic setting of basic volcanic rocks determined using trace element analyses.Earth and Planetary Science Letters 19(2),pp.290–300.

Peccerillo, A. and Taylor, S.R. (1976) Geochemistry of Eocene calc–alkaline volcanic rocks from the Kastamonu area,North ern Turkey. Contributions to Mineralogy and Petrology, 58,63–81.

Ratnakar,J.,Madhavan, V., Srinivasan,T.P and NarsimhaReddy, M(1980): Some preliminary observations on the Purimetla alkaline pluton,Prakasam district, Andhra Pradesh.Geoviews 8, 93-98.

Ratnakar,J., Ramakrishna,D.V., Vijayakumar,K., NagsaiSarma, V and Babu, E.V.S.S.K (1992):A new occurrence of alkaline lamprophyre near Kellampalle, Prakasam district, Andhra Pradesh, India.Current Science 63,569-570.

Ratnakar, J and Vijayakumar, K (1994):TheRavipadugabbros, Prakasam province, Andhra Pradesh(Abstract).Workshop on Eastern Ghat Mobile Belt,Visakhapatnam,India.,1994,80-81.

Rock,  N .M .S(1987):The nature and origin of lamprophyres.Geological Society Special Publication 30,191-226.

Rock, N.M.S(1991):Lamprophyres.Blackie, Glassgow, 285p.

Subrahmanyam, K.,Mallikharjuna Rao, J and Leelanandam, C (1987):Occurrence lamprophyre dykes near Khammam, Andhra Pradesh.Indian Journal of Geosciences. 59, 65–70.

Sun, S.S and McDonough, W.F(1989):Chemical and isotopic systematic of oceanic basalts: implications for mantle composition and processes.Geological Society London, Special. Publication 42, 313–345.

Sun,C.M.,Bertrad,J.,1991.Geochemistryofclinopyroxenesinplutonicandvolcanicsequences from the Yanbian Proterozoic ophiolites (Sichuan Province, China):petrogenetic and geotectonic implications. Schweiz. Mineral. Petrog. Mitt. 71,243–259.

Taylor, W.R., Rock, N.M. and Groves, D.I. (1994) Geochemistry of Archean shoshonitic lamprophyres from the Yilgarn Block, Western Australia: Au abundance and association with gold mineralization. Applied Geochemistry, 9, 197–222.

Thorpe, R.S(1987):Permian K-rich volcanic rocks of Devon: petrogenesis, tectonic setting and geological significance.Earth Science 77,361-366.

Wyman,D.A.andKerrich,R.(1989)Archeanlamprophyresofthe Superior Province, Canada: distribution, petrology, and geo- chemical characteristics. Journal of Geophysical Research,94B, 4667–96.

Wyman, D.A. and Kerrich, R. (1993) Archean shoshonitic lamp- rophyres of the Abitibi Subprovince, Canada: Petrogenesis, Age and tectonic setting.JournalofPetrology,34,1067–1109.

DOI

10.62226/ijarst20262830

PAGES : 94-105 | 6 VIEWS | 2 DOWNLOADS

How do you cite this paper?

Debapriya Adhikary and ChinchuS.V — “Petrology and Geochemistry study of the new finding of Shoshonitic lamprophyre from South of Polshettigudem, Khammam District, Eastern Dharwar Craton, South India.” International Journal of Advanced Research in Science and Technology (IJARST), Volume 15, Issue 10. DOI: 10.62226/ijarst20262830.

Read / Download Full Article