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Mineralogy and geochemistry of siliciclastic Miocene Cuddalore Formation,Cauvery Basin,south india:Implications for provenance and paleoclimate

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Journal of Palaeogeography 2021年第4期10卷 602-630页

作者： Nurul Absar Department of Earth Sciences Pondicherry UniversityPondicherry 605014India

The Cuddalore Formation of the Cauvery Basin received siliciclastic detritus from inland areas of the southern Granulite Terrain(SGT).It represented continental-fluvial sedimentation in the eastern continental margin of south india during the *** Summer Monsoon was thought to be initiated in the early Miocene and intensified during the middle Miocene causing major climatic shifts in the indian *** the present work,detailed mineralogical and geochemical studies on the siliciclastic Cuddalore Formation have been carried out to understand the provenance and paleoclimatic conditions during the *** paleocurrent direction,textural immaturity and framework detrital modes of sandstones suggest rapid uplift of basement and sediment source from nearby Madras Block of *** diagnostic immobile trace element ratios such as Th/Sc,Co/Th,La/Sc,La/Co suggest a tonalite-trondhjemite-granodiorite-charnockite provenance,and somewhat more felsic composition of source area compared to the present upper continental crust(UCC).Rare earth element mixed model suggests that sediments were dominantly(80%)sourced from felsic charnockite,with a minor contribution(20%)from mafic *** abundance of advanced-weathering products like kaolinite,very high(>98)chemical index of alteration(CIA)values,severe depletion of mobile elements(Ca,Na,K,Mg,Ba,Rb)in comparison to UCC,significantly higher a Mg,a Ca,a Na,a K,a Sr and a Ba values(higher than the unity),all suggest the extreme chemical weathering in source terrain and/or in the sedimentary *** based on CIA show high average surface temperature between 29.3℃and 29.5℃and high mean annual precipitation ranging from 2339 mm/yr to 2467 mm/*** geochemical data are consistent with the paleogeographic position of the depositional basin(Cauvery Basin)and suggest the deposition of Cuddalore sediments(the Cuddalore Formation)in a nearequatorial location under a warm climate condition with abunda

关键词： Clastic sediment geochemistry Provenance Paleoclimate Tectonic setting Miocene Cuddalore Formation Cauvery Basin south india

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Zr, Hf, U, Th and REE-Fertile Lower Proterozoic Potassic Granite from Parts of Andhra Pradesh, south india

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Acta Geologica Sinica(English Edition) 2004年第4期78卷 921-930页

作者： Yamuna SINGH Atomic Minerals Directorate for Exploration and Research

The medium- to coarse-grained and porphyritic granitoid of Dharmawaram, Karimnagar district, Andhra Pradesh, south india is a biotite-hornblende granite with notable contents of rare metal (Zr, Hf, Th) and rare earth (including Y) minerals like zircon, thorite, allanite, monazite and xenotime. Chemically, it is metaluminous (average A/ C+N+K = 0.95)-type, potassic (av. 5% K2O) granite, with dominantly sub-alkaline characters. It shows up to 8 times enrichment of rare metals (Zr, Hf, U, Th) and rare earths (including Y, Sc), with reference to their abundances in normal unevolved granite, and hence, fertile for some of these elements. Field, petrological, geochemical and isotopic data of potassic granite (PG) indicate involvement of silica-rich metasedimentary-basic crustal rocks (amphibole-quartzite, amphibolite, hornblende-biotite gneiss, etc.) in its genesis, at a depth range of 30 km. Further, chondrite-normalized REE patterns demonstrate that low-degree partial melting of source rocks is the major controlling factor in the genesis of PG Mild negative Eu-anomaly (av. Eu/Eu* = 0.48), plots of Ba-Rb-Sr in the field of anomalous granite and K/Rb ratios (av. 239) in the range that is shown by normal unevolved granite together indicate less fractionated nature of the PG Limited fractionation of metalumination-type, involving hornblende, led to occasional weak alumina saturation. Interestingly, geochemical and petrogenetic features of the studied PG broadly match with those potassic granites which are already known to host anomalously high enrichment of rare metals and rare earths in other parts of Andhra Pradesh and adjoining Karnataka.

关键词： Potassic granite Andhra Pradesh south india

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A potent fish pathogenic bacterial killer Streptomyces *** from the soils of east coast region,south india

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Journal of Coastal Life Medicine 2013年第3期 175-180页

作者： Durairaj Thirumurugan Ramasamy Vijayakumar Department of Microbiology Bharathidasan University Constituent College Kurumbalur-621107 PerambalurTamilnaduIndia

Objective:To investigate the potentiality of the marine actinobacteria isolated from marine soil against fish pathogenic ***:east coast region(ECR)of Tamilnadu,south *** they were used for the isolation of actinobacteria by using conventional serial dilution technique on starch casein agar *** antibacterial activities of the actinobacteria were screened primarily by using cross streak plate method against fish pathogenic bacteria namely Vibrio alginolyticus,Vibrio parahaemolyticus,Vibrio cholera,Aeromonas *** Pseudomonas *** antimicrobial efficacy of the selected isolates was carried out with various organic solvents,and finally the active compound was subjected to chromatographic techniques including TLC and ***:In the present study,a total of 33 soil samples were collected from the Bay of Bengal,against fish pathogenic *** of 21 antibacterial isolates,the isolate ECR77 was selected for further study based on its potential activity against fish pathogenic *** the various solvents tested,the ethyl acetate extract had good antibacterial activity against the tested bacterial *** isolate ECR77 grew well on oat meal agar medium with 2%salt level at 35°***-MS study found that the presence of bioactive compounds namely tetradecanoic acid,n-hexadecanoic acid and octadecanoic *** morphological,physiological,biochemical and cultural characteristics of the potential isolate were supported the identity up to generic level asStreptomyces ***:The results obtained from this study concludes that the ECR soils of south india is a hot spot of novel bioactive compound producing marine actinobacteria with great pharmaceutical *** the 82 actinobacteria isolated,21(26%)isolates were possessed antibacterial activity.

关键词： East coast region south india Streptomyces sp.ECR77 Antibacterial activity GC-MS Decanoic acids

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Hydrogeochemistry and Groundwater Quality Assessment of Rapur Area, Andhra Pradesh, south india

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Journal of Geoscience and Environment Protection 2016年第4期4卷 88-99页

作者： Arveti Nagaraju P. Muralidhar Y. Sreedhar Department of Geology S V University Tirupati India

The assessment of the quality of groundwater in Rapur area of Nellore District has been carried out with an objective to determine the hydrogeochemical validity. A total of 30 samples of groundwater were collected from wells occurring in the study area. The analyzed physicochemical parameters such as pH, electrical conductivity, total dissolved solids, silica, calcium, magnesium, sodium, potassium, bicarbonate, carbonate, sulfate, and chloride are used to characterize the ground-water quality and its suitability for drinking and irrigational uses. Based on the analytical results, chemical indices like sodium absorption ratio (SAR), adjusted SAR, percent sodium (Na %), potential salinity, residual sodium carbonate (RSC), permeability index (PI), chloroalkaline indices, Kelly’s ratio, magnesium ratio and Gibbs ratios have been calculated. Chadha rectangular and diagram for geochemical classification and hydrochemical processes of groundwater indicated that most of the waters are Na-Cl and Ca-Mg-Cl types. The Gibb’s plot indicates that the groundwater chemistry of the study area is mainly controlled by rock-water interaction.

关键词： Groundwater Hydrochemistry Quality Assessment Rapur south india

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Dolomite hosted magnesite deposits of Cuddapah basin, south india: tectonic and climatic implications

Dolomite hosted magnesite deposits of Cuddapah basin, South ...

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International Conference of Mineralization in Precambrian Terranes & Unesco/Iugs Igcp 443 Annual Meeting and Field Correlation 2003

作者： S. Anirudhan V. Prasannakumar Department of Geology University of Kerala Kariavattom Trivandrum india 695581 Department of Geology University of Kerala Kariavattom Trivandrum india 695581

Introduction Cuddapah basin,one of the Purana basins of indian subcontinent,comprises of sedimentary formations of fluvial to shallow marine litho *** basin has a crescent shape,with 440 km long eastern concave margin and average width of 145 km,occupying an area of 44500 km and containing 12 km thick sedimentary *** formation,belonging to midProterozoic age,is constituted by orthoquartzite-carbonate suite and basic to acid volcanics.

关键词： Dolomite hosted magnesite deposits of Cuddapah basin south india tectonic and climatic implications

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Role of Multi-Generation Dyke Emplacements in Moyar-Bhavani Shear Zone, south india

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 112-页

作者： P.Pratheesh V.Prasannakumar K.R.Praveen C.Vikas CGIST University of Kerala Kariavattom Campus Thiruvananthapuram Geological Survey of india State Unit: Kerala ONGC FB Cauvery Asset

The Moyar-Bhavani Shear Zone(MBSZ)of the south indian Granulite Terrain(SIGT),a complex continental block formed by the accretion of various crustal units during the Archaean to Neoproterozoic,bear evidences of

关键词： KR south india Role of Multi-Generation Dyke Emplacements in Moyar-Bhavani Shear Zone

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Lichens of the Sirumalai hills,Eastern Ghats with one genus and six species new to india

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Studies in Fungi 2021年第1期6卷 204-212页

作者： Nayaka S Joseph S Rajaram SK Natesan S Sankar K David MLR Upreti DK Lichenology Laboratory CSIR-National Botanical Research InstituteRana Pratap MargLucknow-226001Uttar PradeshIndia Department of Biotechnology Kamaraj College of Engineering and TechnologyK.VellakulamNear VirudhunagarMadurai-625701Tamil NaduIndia

Lichens of Sirumalai hills are reported here for the first *** biota comprised of 95 *** genus Japewiella is reported for the first time in india and is represented by ***(***.)***,the following six taxa including one variety are new to india *** atra(Pers.)***.,Graphis brevicarpa ***.,Kashiw.&***,Micarea erratica(Körb.)Hertel,Rambold&Pietschm.,Pertusaria cicatricosa *** ***,Elix&Streimam,Porina subargillacea Müll Arg.,and Pyxine schmidtii *** accounts for all the new records to india are provided to facilitate their *** redingeri Grube and Lepraria caesiella *** are reported for the first time from south *** all above,29 species are recorded for the first time from the state of Tamil *** lichen biota of the area is primarily corticolous in habitats and dominated by crustose form.

关键词： lichenized fungi new records south india Tamil Nadu tropical lichens

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