Petrogenesis of 3.15 Ga old Banasandra komatiites from the Dharwar craton, India: Implications for early mantle heterogeneity

Maya, J.M.; Bhutani, Rajneesh; Balakrishnan, S.; Sandhya, S. Rajee

doi:10.1016/j.gsf.2016.03.007

Cited by 59 publications

(17 citation statements)

References 56 publications

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“…113, NO. 7, 10 OCTOBER 20171395 belts) are considered to be younger and deposited between 3 and 2.55 Ga. On the basis of the first U-Pb SHRIMP zircon age data for the detrital zircons, separated from the quartzites of the Sargur Group exposed near Holenarasipur and Banavar, Nutman et al 11 suggested that the sedimentary protoliths of quartzites were derived from a provenance with a minimum age of 3.0 Ga. Jayananda et al 22 and Maya et al 23 reported 3.35 and 3.15 Ga ages respectively, for the komatiitic ultramafic rocks of the Sargur Group. Trendall et al 24 reported U-Pb SHRIMP zircon ages of 2.72 and 2.6 Ga for the metavolcanic rocks of the Bababudan and Chitradurga Groups respectively, of the Dharwar Supergroup.…”

mentioning

confidence: 99%

U–Pb and Lu–Hf Systematics of Zircons from Sargur Metasediments, Dharwar Craton, Southern India:New Insights on the Provenance and Crustal Evolution

et al. 2017

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A study of U-Pb and Lu-Hf-Yb isotope data in zircons from metamorphosed psammopelite and quartzite from the type area of Archaean Sargur Group, Dharwar Craton, India is carried out. Two age populations are observed: an older population with concordant U-Pb ages between 2.7 and 2.8 Ga, and a younger population with ages in the 2.4-2.6 Ga age range. The Hf values of 0 to +2.0 for the older zircon population suggest that they were derived from juvenile crust formed at 2.7-2.8 Ga. Sub-chondritic Hf values for the younger population indicate metamorphism and/or crustal reworking at ~2.5 Ga. Metasedimentary enclaves in the Sargur type area are therefore part of the gneiss-supracrustal complex of different antiquities and may not have an independent stratigraphic status.

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confidence: 99%

U–Pb and Lu–Hf Systematics of Zircons from Sargur Metasediments, Dharwar Craton, Southern India:New Insights on the Provenance and Crustal Evolution

et al. 2017

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“…On the other hand, komatiites from the adjoining Kalyadi and Nuggihalli greenstone belts provided a less precise Sm-Nd whole-isochron age of 3284 ± 310 Ma . Furthermore, Maya et al (2011) presented a Sm-Nd whole-rock isochron age of 3136 ± 200 Ma whilst Mondal et al (2008) indicated 3156 ± 170 Ma for komatiites of the Nuggihalli belt. In summary, the published ages indicate a major episode of Palaeoarchaean (ca.…”

Section: Widespread Palaeoarchaean Komatiite Volcanism and Sub-contemmentioning

confidence: 98%

“…A pronounced stratigraphic break between the J.C. Pura belt (older Sargur Group) and Kibbanahalli arm (younger Bababudan Group) volcanic-sedimentary sequences has been demonstrated through unconformity defined by Venkata Dasu et al, 1991;Srikantia and Bose, 1985;Jayananda et al, 2008;Maya et al, 2011) Figure 2. Stratigraphic successions of Sargur Group -J.C. Pura and Banasandra greenstone belt (Venkata Dasu et al 1991;Srikantia and Bose 1985;Jayananda et al 2008;Maya et al 2011). Chardon et al 1996) showing sample locations.…”

Section: Jcpura Greenstone Beltmentioning

confidence: 99%

“…Recent Sm-Nd whole-rock isochrons on komatiites in the central part of the western Dharwar craton reveal ages ranging from ca. 3.38-3.15 Ga Mondal et al 2008;Maya et al 2011). Whole-rock geochemical data and Nd isotopes reveal their derivation from heterogeneous mantle sources from different depths Mukherjee et al 2010;Tushipokla and Jayananda 2013;Manikyamba et al 2014b).…”

Section: Introductionmentioning

confidence: 98%

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Physical volcanology and geochemistry of Palaeoarchaean komatiite lava flows from the western Dharwar craton, southern India: implications for Archaean mantle evolution and crustal growth

Jayananda

Duraiswami

Aadhiseshan

et al. 2016

International Geology Review

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Palaeoarchaean (3.38-3.35 Ga) komatiites from the Jayachamaraja Pura (J.C. Pura) and Banasandra greenstone belts of the western Dharwar craton, southern India were erupted as submarine lava flows. These high-temperature (1450-1550°C), low-viscosity lavas produced thick, massive, polygonal jointed sheet flows with sporadic flow top breccias. Thick olivine cumulate zones within differentiated komatiites suggest channel/conduit facies. Compound, undifferentiated flow fields developed marginal-lobate thin flows with several spinifex-textured lobes. Individual lobes experienced two distinct vesiculation episodes and grew by inflation. Occasionally komatiite flows form pillows and quench fragmented hyaloclastites. J.C. Pura komatiite lavas represent massive coherent facies with minor channel facies, whilst the Bansandra komatiites correspond to compound flow fields interspersed with pillow facies. The komatiites are metamorphosed to greenschist facies and consist of serpentine-talc ± carbonate, actinolite-tremolite with remnants of primary olivine, chromite, and pyroxene. The majority of the studied samples are komatiites (22.46-42.41 wt.% MgO) whilst a few are komatiitic basalts (12.94-16.18 wt.% MgO) extending into basaltic (7.71 -10.80 wt.% MgO) composition. The studied komatiites are Al-depleted Barberton type whilst komatiite basalts belong to the Al-undepleted Munro type. Trace element data suggest variable fractionation of garnet, olivine, pyroxene, and chromite. Incompatible element ratios (Nb/Th, Nb/U, Zr/Y Nb/Y) show that the komatiites were derived from heterogeneous sources ranging from depleted to primitive mantle. CaO/Al 2 O 3 and (Gd/Yb) N ratios show that the Al-depleted komatiite magmas were generated at great depth (350-400 km) by 40-50% partial melting of deep mantle with or without garnet (majorite?) in residue whilst komatiite basalts and basalts were generated at shallow depth in an ascending plume. The widespread Palaeoarchaean deep depleted mantle-derived komatiite volcanism and sub-contemporaneous TTG accretion implies a major earlier episode of mantle differentiation and crustal growth during ca. 3.6-3.8 Ga.ARTICLE HISTORY

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“…A number of earlier publications present geology of the Dharwar Craton (Chardon, Jayananda, Chetty, & Peucat, ; Chardon, Jayananda, & Peucat, ; Mahadevan, ; Sharma, ; Ramakrishnan & Vaidyanadhan, ; Jayananda, Peucat, et al, ; Jayananda, Tsutsumi, et al, ; Jayananda, Chardon, Peucat, & Fanning, , and references therein); however, a brief description is presented below. The Archean basement of the Dharwar Craton comprises 3.40–2.56 Ga amphibolite to granulite facies TTG‐type gneisses (Meen, Rogers, & Fullagar, ; Peucat, Mahabaleswar, & Jayananda, ; Peucat et al, ; Chardon et al, ), and two generations of supracrustal rocks, namely, 3.35–3.15 Ga Sargur Group and 3.00–2.54 Ga Dharwar Supergroup (Nutman, Chadwick, Krishna Rao, & Vasudev, ; Jayananda, Peucat, et al, ; Maya, Bhutani, Balakrishnan, & Sandhya, ). In addition, 2.62–2.52 Ga calc‐alkaline to potassic granites are also reported (Friend & Nutman, ; Jayananda, Chardon, Peucat, Capdevila, & Martin, ; Mahabaleswar, Jayananda, Peucat, & Shadakshara Swamy, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

Geochemistry, petrogenesis, and geodynamic implications of NE–SW to ENE–WSW trending Palaeoproterozoic mafic dyke swarms from southern region of the western Dharwar Craton

et al. 2019

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A number of NE–SW to ENE–WSW trending Palaeoproterozoic mafic dykes, intruded within the Archean basement rocks and more conspicuous in the southern parts of the western Dharwar Craton (WDC), was studied for their whole‐rock geochemistry to understand their petrogenetic and geodynamic aspects. Observed mineralogical and textural characteristics classify them either as meta‐dolerites or dolerites/olivine‐dolerites. They show basaltic to basaltic–andesitic compositions and bear sub‐alkaline tholeiitic nature. Three geochemically distinct groups of mafic dykes have been identified. Group 1 samples show flat REE patterns (LaN/LuN = ~1), whereas the other two groups have LaN/LuN = ~2–3 (Group 2; enriched LREE and flat HREE patterns) and LaN/LuN = ~4 (Group 3; inclined REE patterns). Chemistry is not straightforward to support any significant role of crustal contamination and probably reflect their source characteristics. However, their derivation from melts originated from a previously modified metasomatized lithospheric mantle due to some ancient subduction event cannot be ignored. Most likely different mantle melts were responsible for derivation of these distinct sets of mafic dykes. The Group 2 dykes are derived from a melt generated within spinel stability field by ~10% batch melting of a lithospheric mantle source, whereas the Group 3 dykes have their derivation from a melt originated within the spinel–garnet transition zone and were fed from slightly higher (~12–15%) batch melting of a similar source. The Group 1 samples were also crystallized from a melt generated at the transition zone of spinel–garnet stability field by higher degrees (~20%) of melting of a primitive mantle source. Geochemistry of the studied samples is typical of Palaeoproterozoic mafic dykes emplaced within the intracratonic setting, reported elsewhere globally as well as neighbouring cratons. Geochemistry of the studied mafic dyke samples is also compared with the mafic dykes of the eastern Dharwar Craton (EDC). Except the Group 3 samples, which have good correlation with the 1.88–1.89 Ga Hampi swarm, no other group shows similarity with the EDC mafic dykes. There is an ample possibility to have some different mafic magmatic events in the WDC, which could be different from the EDC. However, it can only be confirmed after precise age determinations.

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Petrogenesis of 3.15 Ga old Banasandra komatiites from the Dharwar craton, India: Implications for early mantle heterogeneity

Cited by 59 publications

References 56 publications

U–Pb and Lu–Hf Systematics of Zircons from Sargur Metasediments, Dharwar Craton, Southern India:New Insights on the Provenance and Crustal Evolution

U–Pb and Lu–Hf Systematics of Zircons from Sargur Metasediments, Dharwar Craton, Southern India:New Insights on the Provenance and Crustal Evolution

Physical volcanology and geochemistry of Palaeoarchaean komatiite lava flows from the western Dharwar craton, southern India: implications for Archaean mantle evolution and crustal growth

Geochemistry, petrogenesis, and geodynamic implications of NE–SW to ENE–WSW trending Palaeoproterozoic mafic dyke swarms from southern region of the western Dharwar Craton

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