Geochemistry of the Neoproterozoic Narji limestone, Cuddapah Basin, Andhra Pradesh, India: implication on palaeoenvironment
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The Neoproterozoic Narji Formation of Cuddapah Basin, Southern India is mainly composed of limestones with minor amount of clastic rocks. Limestones are massive as well as laminated and occasionally chert bearing. Geochemistry (major, trace, and REE) of limestones is studied to strengthen the knowledge on depositional environment of Narji Formation in the direction to better figure out the development of Cuddapah Basin during Neoproterozoic era. Average SiO2 (25.97), Al2O3/TiO2 (16.67), and K2O/Al2O3 (0.21) ratios suggest clastic contamination in the Narji limestones. PAAS (Post Archean Australian Shale) normalized REE + Y pattern of Narji limestones are showing seawater like REE + Y pattern. The Er/Nd and Y/Ho ratios (average 0.17 and 35.68, respectively) of Narji limestones indicate the retention of normal seawater character with the signatures of terrigenous input and diagenesis process. Positive Ce anomaly, high U/Th (> 1.25), and V/(V + Ni) (> 0.5) ratios of Narji limestones clearly indicate their deposition in dyoxic to anoxic condition.
KeywordsGeochemistry Trace elements REE Paleooxidation Neoproterozoic Narji Cuddapah
Analyses of the major oxides and trace, REE are carried out in National Centre for Earth Science Studies, Thiruvananthapuram, Kerala and National Geophysical Research Institute, Hyderabad, respectively. Sincere thanks are also being accorded to Dr. Faraj Habeeb Tobia and an anonymous reviewer for their constructive comments.
This work was financially supported by the Department of Science and Technology (DST), Government of India vide PURSE (Phase-II) program (No. F4/SC/20/15) and University Grants Commission (UGC), New Delhi for the scholarship (UGC Non-Net) given to the first author.
- Anaya-Gregorio A, Armstrong-Altrin JS, Machain-Castillo ML, Montiel-Garcia PC, Ramos-Vazquez MA (2018) Textural and geochemical characteristics of late Pleistocene to Holocene fine-grained deep-sea sediment cores (GM6 and GM7), recovered from southwestern Gulf of Mexico. J Palaeogeogr 7:3CrossRefGoogle Scholar
- Armstrong-Altrin JS, Nagarajan R, Madhavaraju J, Rosales-Hoz L, Lee YI, Balaram V, Cruz-Martinez A, Avila-Ramirez G (2013) Geochemistry of the Jurassic and upper cretaceous shales from the Molango region, Hidalgo, eastern Mexico: implications for source-area weathering, provenance, and tectonic setting. Compt Rendus Geosci 345(4):185–202CrossRefGoogle Scholar
- Armstrong-Altrin JS, Machain-Castillo ML, Rosales-HoZ L, Carranza-Edwards A, Sanchaz Cabeza JA, Ruiz-Fernan AC (2015a) Provenance and depositional history of continental slope sediments in the South western Gulf of Mexico unraveled by geochemical analysis. Cont Shelf Res 95:15–26CrossRefGoogle Scholar
- Bertram CN (2012) Sedimentology, age and stable isotope evolution of the Kurnool group Cuddapah Basin. Dissertation, The University of AdelaideGoogle Scholar
- Folk R (1965) Some aspects of recrystallization in an ancient limestone. In: Pray LC, Murrey RC (eds) Dolomitization and limestone diagenesis, Society of Economic Paleontology Mineralogy Special Publication, vol 13, pp 14–48Google Scholar
- Hernández-Hinojosa V, Montiel-García PC, Armstrong-Altrin JS, Nagarajan R, Kasper-Zubillaga JJ (2018) Textural and geochemical characteristics of beach sands along the western Gulf of Mexico, Mexico. Carpathian J Earth Environ Sci 13(1):161–174Google Scholar
- Hua G, Yuansheng D, Lian Z, Jianghai Y, Hu H (2013) Trace and rare earth elemental geochemistry of carbonate succession in the middle Gaoyuzhuang formation, Pingquan section: implications for early Mesoproterozoic Ocean redox conditions. J Palaeogeogr 2(2):209–221Google Scholar
- Khelen AC, Manikyamba C, Ganguly S, Singh TD, Subramanyam KSV, Ahmad SM, Reddy MR (2017) Geochemical and stable isotope signatures of Proterozoic stromatolitic carbonates from the Vempalle and Tadpatri formations, Cuddapah Supergroup, India: implications on paleoenvironment and depositional conditions. Precambrian Res 298:365–384CrossRefGoogle Scholar
- Lokesh Bharani P (2015) Sedimentology provenance and depositional environments of Kurnool group palnad sub basin Andhra Pradesh South India. Ph.D. dissertation, University of Mysore, Karnataka, IndiaGoogle Scholar
- Madesh P, Lokesh Bharani P, Baby Shwetha S (2012) Study of microstylolite from carbonate rocks of Kurnool group, Andhra Pradesh, South India. Indian J Appl Res 1(2)Google Scholar
- Madhavaraju J, Lee YI (2009) Geochemistry of the Dalmiapuram formation of the Uttatur group (early cretaceous), Cauvery Basin, southeastern India: implications on provenance and paleo-redox conditions. Rev Mex Cienc Geol 26:380–394Google Scholar
- Mouli Chandra A, Hanumanthu RC, Rao Jagadishwara R (2012) Conflicting Land-use Practises in the Narji Limestone Belt in YSR District,Andhra Pradesh (AP),India. Earth Sci India 5(3):1–9Google Scholar
- Nagaraja Rao BK, Rajurkar ST, Ramalingaswami G, Ravindra BB (1987) Stratigraphy, structure and evolution of Cuddapah Basin. Purana basins of peninsular India. Geol Soc India Bangalore Bull 6:33–86Google Scholar
- Ramkumar M (2004) Lithology, petrography, microfacies, environmental history and hydrocarbon prospects of the Kallankurichchi formation (upper cretaceous, Ariyalur group, South India). Palaeont Stratigr. Facies 12:77–100Google Scholar
- Shaltami OR (2015) Geochemistry of the Shahat marl member, Wadi Az Zad, Al Jabal Al Akhdar, NE Libya. Arab J Earth Sci 2(3):23–39Google Scholar
- Taylor SR, McLennan SM (1985) The continental crust: its composition and evolution. Blackwell Scientific, Oxford, p 312Google Scholar
- Tobia FH (2018) Stable isotope and rare earth element geochemistry of the Baluti carbonates (Upper Triassic), Northern Iraq. Geosci J. https://doi.org/10.1007/s12303018-0005-4
- Wright J, Seymour RS, Shaw HF (1984) REE and Nd isotopes in conodont apatite: variations with geological age and depositional environment. Geol Soc Am Spec Pap 196:325–340Google Scholar