ARIJIT PAHARI
@ngri.org.in
Research Scholar, Geochemistry Division
CSIR-National Geophysical Research Institute
Scopus Publications
Scholar Citations
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Scholar i10-index
Scopus Publications
C. Manikyamba, M. Santosh, K.S.V. Subramanyam, G. Harshitha Reddy, Jyotisankar Ray, Asima Kar, and Arijit Pahari
Elsevier BV
C. Manikyamba, Arijit Pahari, M. Santosh, K.S.V. Subramanyam, and G. Harshitha Reddy
Elsevier BV
Arijit Pahari and C. Manikyamba
Springer Nature Singapore
C. Manikyamba, C. S. Sindhuja, A. C. Khelen, and Arijit Pahari
Springer Science and Business Media LLC
The Banded iron formations (BIFs) and manganese formations of Chitradurga, Shimoga and Sandur greenstone belts of Dharwar craton, associated with the stromatolitic carbonates, carbonaceous phyllites and shales along with gold mineralization, are best geological entities to evaluate the Archean biogeochemical processes and transformation of a habitable Earth. The geochemical anomalies along with C, O and S isotopic signatures of stromatolitic carbonates, carbonaceous phyllites and sulphidic BIFs reflect on biogenic signatures, fluctuating Archean ocean temperatures from 25–75°C and anoxic to euxinic redox conditions. The U-Pb detrital zircon ages of these stromatolitic carbonates indicate 3.5 to 2.6 Ga whereas the carbonaceous shales indicate 3.2–2.2 Ga reflecting the transportation of organic matter to the ocean basin during the growth of stromatolitic carbonates. The gold content of carbonaceous phyllites and sulphidic BIFs indicates hydrothermal source. The O 2 produced due to stromatolitic activity has deposited Mn and Fe of the Archean oceans as BIFs and Mn formations. The biogenic matter of the stromatolites along with other siliciclastic material, gold and sulphides derived from the volcanic activity mixed and formed as carbonaceous shales in the ocean basin under euxinic conditions. The comprehensive geological, geochemical including isotopic studies on these rock types collectively indicate the interaction of lithosphere-hydrosphere-atmosphere-biosphere in the Archean oceans which paved the way for the advanced forms of life.
C.S. Sindhuja, Arijit Pahari, C. Manikyamba, M. Santosh, Li Tang, Jyotisankar Ray, K.S.V. Subramanyam, Madhuparna Paul, I. Gonzalez-Alvarez, and P.C. Sruthi
Elsevier BV
Chakravadhanula Manikyamba, Sohini Ganguly, and Arijit Pahari
Springer Science and Business Media LLC
This study presents a comprehensive account of the petrogenetic and geodynamic evolution of the Bellara Trap volcanic rocks from the Ingaldhal Formation, Chitradurga Group, western Dharwar Craton (WDC). Geochemical attributes of these rocks are consistent with two groups with distinct evolutionary trends: one comprising tholeiitic, MORB (mid-ocean ridge basalt) type basalts (BTB) and the other corresponding to calc-alkaline andesites (BTA). Basalts are essentially composed of clinopyroxene and plagioclase whereas the andesites are porphyritic with phenocrysts of plagioclase, clinopyroxene and polycrystalline quartz embedded in a groundmass of K-feldspar, quartz and opaques. Primary igneous mineralogy is overprinted by greenschist facies metamorphism resulting in chlorite-actinolite-plagioclase assemblage. The BTB samples reflect nearly flat REE patterns with weak LREE enrichment in contrast to pronounced LREE enhancement over HREE discernible for BTA. Tectonically, the BTB samples correspond to an active mid-oceanic ridge-rift setting with a MORB composition, whereas a back-arc basin (BAB) regime is corroborated for the BTA samples fractionating from back-arc basin basalts. Geochemical imprints of subduction input are more pronounced in BTA compared to BTB as mirrored by their elevated abundances of incompatible fluid mobile elements like Ba, Th, U and LREE. The BTB is endowed with an N- to E-MORB signature attributable to minor contributions from subduction-related components at the inception of a back-arc basin in the vicinity of an active subduction system. The BTA derived through differentiation of a basaltic magma with BABB (back-arc basin basalt) affinity compositionally akin to a heterogeneous source mantle carrying depleted MORB-type and enriched arc-type components inducted with progressive subduction. The BABB-type andesites and MORB-type basalts from Bellara Traps record a compositional heterogeneity of mantle in an intraoceanic arc-back arc system. Mantle processes invoke a BABB-MORB spectrum with a MORB-like endmember and an arc-like endmember associated with a juvenile back-arc basin. This study infers a Neoarchean analogue of Mariana-type back-arc rift setting proximal to the arc with a gradual transition from anhydrous to hydrous melting processes synchronized with MORB-mantle and arc-mantle interaction during initiation of a nascent back arc adjacent to the arc. The MORB-BABB compositional spectrum for the Bellara Traps conforms to a Neoarchean back-arc basin that evolved under an extensional tectonic regime associated with incipient stages of back-arc rifting and incorporation of subduction-derived components in the mantle output. This study complies with Neoarchean intraoceanic accretionary cycle plate tectonics in WDC.
Arijit Pahari, Th Dhanakumar Singh, C Manikyamba, and K S V Subramanyam
Springer Science and Business Media LLC
The Meso-Neoarchean Kudremukh greenstone belt (KGB) of Western Dharwar craton comprises predominant metabasalts associated with banded iron formations (BIFs). The metabasalts are characterized by moderate MgO (7.23–8.97 wt.%), Ni (48–374 ppm), Cr (33–188 ppm) with a wide variation in ∑\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\sum $$\\end{document}PGE (21.8–215.7 ppb) contents with 15.8–115.9 ppb Pd, 3.7–105.2 ppb Pt and 0.7–8.5 ppb Rh. Among IPGE group, Iridium, Osmium and Ruthenium range from 0.2–5.9, 1.4–7 and 1.8–7.8 ppb, respectively. These metabasalts are relatively enriched in ∑\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\sum $$\\end{document}PPGE (21.8–215.7 ppb) than ∑\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\sum $$\\end{document}IPGE contents (3.6–18.6 ppb). Their Pd/Ir (7.6–100.7) and Pd/Pt (0.8–5.5) ratios correspond to moderate to lower degree of melting. The abundance of PGEs in Kudremukh metabasalts is dominantly controlled by sulphide and chromite fractionation trend of the parent magma. Sulphur undersaturated nature of the parent magma is evidenced through the relationship of Pd vs. Cu. Further,̄ the Cu/Pd ratios of the studied volcanics (Cu/Pd = 1277–5747) is lower than primitive mantle (Cu/Pd = 7000), indicating early sulphide removal and S-undersaturation during magmatic differentiation. PGEs geochemistry of the studied rocks suggest early removal of sulphide melts followed by pronounced sulphide fractionation and the mantle melting episode is followed by metasomatism of the refractory mantle wedge by the fluids/melts derived from the subducting slab in a convergent margin setting. PGE systematics on the metabasalts from Kudremukh greenstone belt, western Dharwar Craton, India. The KGB metabasalts are characterised by low- moderate degrees of partial melting and high degrees of sulphide fractionation. PGE geochemistry of the KGB metabasalts infers the early sulphur undersaturated nature of magmas. PGE systematics on the metabasalts from Kudremukh greenstone belt, western Dharwar Craton, India. The KGB metabasalts are characterised by low- moderate degrees of partial melting and high degrees of sulphide fractionation. PGE geochemistry of the KGB metabasalts infers the early sulphur undersaturated nature of magmas.
C. Manikyamba, Sohini Ganguly, M. Santosh, Li Tang, C.S. Sindhuja, Arijit Pahari, Th. Dhanakumar Singh, and Abhishek Saha
Elsevier BV
C. Manikyamba, Sohini Ganguly, M. Santosh, Li Tang, C.S. Sindhuja, Arijit Pahari, Th. Dhanakumar Singh, and Abhishek Saha
Elsevier BV
C.S. Sindhuja, C. Manikyamba, Arijit Pahari, M. Santosh, and Li Tang
Elsevier BV
Chakravadhanula Manikyamba, Naresh C Ghose, Sohini Ganguly, Arijit Pahari, and Challa Satyasri Sindhuja
Wiley
Arijit Pahari, P Prasanth, Devleena M Tiwari, C Manikyamba, and K S V Subramanyam
Springer Science and Business Media LLC
The granite batholiths of eastern Dharwar Craton, which are showing intrusive relationship with TTGs, exposed in the eastern part of Telangana state at University of Hyderabad, Gachibowli (9.30 km2), are studied for their petrographic and geochemical characteristics compared with their counterparts in EDC and evaluated their petrogenesis. These are predominantly microcline and quartz with subordinate plagioclase, exhibiting intergranular and perthitic textures. Geochemically, they are strongly peraluminous to slightly metaluminous in nature with high Alumina Saturation Index (ASI) ranging from 0.86 to 1.11 indicating the role of plagioclase in their genesis. Their alkali-calcic to alkalic nature, narrow range of Modified Alkali-Lime Index (MALI; Na2O+K2O −CaO), and low Fe-number reflect their similarities with the I-type Cordilleran granites. Prominent negative Europium anomalies, high Sr, Rb, Rb/Sr and low Sr/Y ratios indicate moderate to low pressure partial melting of pre-existing TTG with residual plagioclase in the source. We suggest, the melting of older TTGs through crustal anataxis process formed these granites and the sanukitoid melts supplied the required heat for the melting of TTG to evolve into granites. The genesis of these granites supports reworking of older crust, crustal differentiation during syn-collisional stage and marks the stabilization of continental crust in the Dharwar Craton during the Neoarchean time.
C. Manikyamba, Arijit Pahari, M. Santosh, Jyotisankar Ray, C.S. Sindhuja, K.S.V. Subramanyam, and Mutum Rajanikanta Singh
Elsevier BV
C.S. Sindhuja, C. Manikyamba, Arijit Pahari, and M. Satyanarayanan
Elsevier BV
Abstract The banded iron formations which are hosted in the greenstone belts of Dharwar Craton are potential sources of iron and also major archives of gold mineralization at some places. The gold bearing banded sulphidic cherts from the Neoarchean Sandur greenstone belt of western Dharwar Craton have been reported in this paper in order to understand their geochemical characteristics, source of gold mineralization and depositional conditions. These rocks are predominantly characterized as mixed oxide-sulphide facies which are generally referred as sulphide facies iron formations, consisting of alternate mesoscale bands of silica and iron with sulphides such as pyrite, chalcopyrite, galena, arsenopyrite and sphalerite occurring as minor opaque phases. Mineral chemical analyses of pyrite having high Fe/(S + As), Co/Ni and Pb/As ratios suggests hydrothermal source. Native gold occurs as disseminations in these sulphides with its concentrations ranging from 0.05 to 1.48 ppm. Gold mineralization is sediment hosted variety, epigenetic, epithermal-hydrothermal in origin, where the sulphidic-auriferous fluids generated at Mid oceanic ridge (MOR)-hydrothermal system were transported and deposited in an oxygen-deficient environment. Low CaO, MgO, K2O and ƩREE contents suggests minor detrital input while La-Th-Sc relationship indicate minor volcaniclastic source from metabasic rocks. Low K/Rb and Th/U illustrate negligible effects of weathering in these samples. Geochemical proxies such as superchondritic Y/Ho ratios along with Post Archean Australian Shale (PAAS) and Mud from Queensland (MUQ) normalized REE + Y patterns with depleted LREE and positive Eu, La and Y anomalies suggest that these BIFs were generated by the chemical precipitation of iron and silica in sea water at MOR and continental margin setting which had suboxic to anoxic paleo-redox conditions.
C. Manikyamba, Arijit Pahari, Th. Dhanakumar Singh, Adrija Chatterjee, and Sohini Ganguly
Elsevier BV
Abstract Dharwar Craton of southern peninsular India is one of the significant Archean cratons in the world with well developed greenstone belt sequences representing plume-arc accretionary tectonics. The eastern Dharwar Craton (EDC) is endowed with excellent gold mineralization which is being mined and the greenstone belt lithounits among which majority of them represent the convergent margin processes. The Neoarchean Kadiri greenstone belt of EDC consists of an array of mafic, intermediate and felsic volcanic rocks among which the mafic rocks exhibit a wide range of silica (49.74–65.19 wt.%), high LILE, HFSE including the Nb contents (7−15 ppm) that are classified as Nb-enriched basaltic andesites (NEBA). Moderate composition of SiO2 (57−63 wt.%) along with higher MgO (3.96–7.58 wt.%), Cr (44−890 ppm) and Ni (22−491 ppm) contents distinguish some of the intermediate rocks as Mg-andesites. The petrographic characteristics along with higher silica (63−75 wt.%), Na2O (2.21–4.01 wt.%) and low K2O (0.7–3.35) classify the associated felsic volcanic rocks as sodic adakites. Abundance of K-feldspar phenocrysts and higher K2O content (1.19–7.0 wt.%) in some adakites identify them as potassic adakites. The geochemical characteristics of the calc-alkaline andesite-dacite-rhyolites (ADR) reflect on typical island arc environment involving the processes of fractional crystallization and crustal contamination in an active continental margin environment. The NEBA and Mg-andesites are the products of hybridized mantle wedge under the influence of slab fluids/melts whereas the Na-adakites are the slab melts erupted within the oceanic domain and the K-adakites were emplaced under the influence of continental crust during the migration of the island arc towards the continental margin. Beside the generation of various types of volcanic rocks, these convergent margin processes have played a significant role in the generation and mobilization of gold mineralized fluids, which are being mined from some greenstone belts of EDC.
Arijit Pahari, Li Tang, C. Manikyamba, M. Santosh, K.S.V. Subramanyam, and Sohini Ganguly
Elsevier BV
Shan-Shan Li, M. Santosh, Sohini Ganguly, P.V. Thanooja, K. Sajeev, Arijit Pahari, and C. Manikyamba
Elsevier BV
Debattam Sarkar, Subhendu Bardhan, Subhronil Mondal, Anirban Das, Arijit Pahari, Dipankar Buragohain, and Sandip Saha
Institute of Malacology
ABSTRACT Predator-prey interaction, especially drilling and shell-breaking predation pressure, caused significant evolutionary changes within these predator-prey communities. Although temporal trends are well understood in prey assemblages, studies to trace such changes within taxonspecific clades up to Recent times have been rare. Here, we studied both the drilling and shell-breaking predation on Recent terebrid gastropods from the Indian subcontinent and compared the results with a newly updated, global database. The major part of our data came from a large collection reposited in the archive of the Zoological Survey of India in Kolkata for more than 100 years. Detailed analyses of this study based on a newly raised, global database revealed the following findings: (1) Drilling frequency (DF) of Indian terebrids was low, but consistent with the DF of only available but limited data provided by Vermeij et al. (1980). In comparison, peeling frequency (PF) in Indian terebrids appeared to be highest in the world; (2) DF showed latitudinal variation, that is, higher incidence of drilling occurred in higher latitudes; no such pattern emerged from the PF data; (3) drillholes were site-stereotyped, which suggested that Recent naticid drillers were escalated; (4) shell ornaments failed to protect against durophagy; (5) shell shape and thickness had different impact against different modes of predation. While slender and thicker shells were almost immune to drilling predation, no such relation existed for peeling predation; (6) on the other hand, body size appears to have evolved as anti-predatory traits in Recent terebrids. Larger species had low DF and high PF values; (7) temporally, DF showed fluctuating pattern, with modern values showing declining trend. This was perhaps due to increase in body size and behavioural change of the terebrid gastropods. Unfortunately, no peeling frequency data for this clade was available from the fossil record.
Arijit Pahari, Subhronil Mondal, Subhendu Bardhan, Debattam Sarkar, Sandip Saha, and Dipankar Buragohain
Elsevier BV
Abstract Chandipur intertidal flat in eastern coast of India is a killing field. The vast stretch of intertidal habitat opens up during the low tide, and is monopolized by a single naticid species which preys extensively on intertidal taxa. The predator, Natica tigrina, wades through the soft sediments and ambushes on epi- or infaunal prey. There were reports on naticid subaerial hunting, where the workers made vivid observations, but only in few instances quantified different aspects of predation. Detailed quantitative analyses of the present study revealed that N. tigrina attacks opportunistically on all infaunal and epifaunal intertidal bivalve and gastropod prey taxa. Drilling frequencies ranged from 9.70% to 67.67% with no apparent relation with relative abundances of the taxa. High drilling frequency on conspecific predation perhaps suggested elimination of the potential competitor as well as a profitable prey. Behavioral data of predation, i.e., stereotypy of site and size of drillholes on prey shells and low prey effectiveness indicated that the predator was highly efficient.