An appraisal of Archaean supracrustal sequences in Chitradurga Schist Belt, Western Dharwar Craton, Southern India

Hokada, Tomokazu; Horie, Kenji; Satish-Kumar, M.; Ueno, Yuichiro; Nasheeth, Abdulla; Mishima, Kaoru; Shiraishi, Kazuyuki

doi:10.1016/j.precamres.2012.04.006

Cited by 107 publications

(55 citation statements)

References 51 publications

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“…2.50 Ga. Based on Pb-Pb isotopic study of marbles from the type area of Sargur Group, Sarangi et al 32 also did not obtain evidence of metamorphism older than 2.5 Ga; the age of metamorphism was the same as recorded by Russel et al 40 in the marbles of Dharwar Supergroup. Hokada et al 27 have reported 3.08 Ga monazite age as probable for metamorphism of the Sargur Group. Our zircon age data do not support this view.…”

Section: Discussionmentioning

confidence: 98%

“…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. SHRIMP U-Pb geochronological studies of the felsic volcanic rocks have largely reinforced the view that the Dharwar greenstone belt volcanics are younger than 3 Ga (refs [25][26][27]. Although the foregoing geochronological studies support the classification of supracrustal sequence in the Dharwar Craton into Sargur Group (older than 3.0 Ga) and Dharwar Supergroup (3.0-2.55 Ga), they contradict an alternative view that the Sargur Group rocks, which occur as enclaves in gneisses, are a complex that consists of supracrustal rocks of Dharwar Supergroup as well as of some older rocks 8,28 .…”

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confidence: 99%

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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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Section: Discussionmentioning

confidence: 98%

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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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“…This mafic association reflects the lower part of the Sargur Group. Latest age data (Hokada et al 2013 and references therein) for detrital zircons in mafic lithologies within this group gives 3.58-3.13 and 3.23 Ga, while felsic volcanics (upper Sargur Group) date di-rectly at 3298 ± 7 Ma. From the area of the Gadag greenstone belt in the north of the WDC, there is evidence for 3.6 Ga protocrust and a major crustal growth episode (i.e., the Pen-insular Gneiss complex, PGC) at ca.…”

Section: Western Dharwar Cratonmentioning

confidence: 78%

“…The approximately coeval and widespread Ingaldhal Volcanics comprised a pillow lava -pyroclastic (bimodal volcanics) -chert -BIF assemblage, laid down in the interior of the basin. These two assemblages make up "succession 2"; age data from Hokada et al (2013) for the Lower Chitradurga Group indicates deposition at <2.72 Ga. (3) "Succession 3" (cf. Ranebennur Subgroup) comprises a greywacke -phyllite -BIF -polymict conglomerate -volcanic succession.…”

Section: Western Dharwar Cratonmentioning

confidence: 99%

A review of the inferred geodynamic evolution of the Dharwar craton over the ca. 3.5–2.5 Ga period, and possible implications for global tectonics

et al. 2014

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Abstract:The geological history and evolution of the Dharwar craton from ca. 3.5-2.5 Ga is reviewed and briefly compared with a second craton, Kaapvaal, to allow some speculation on the nature of global tectonic regimes in this period. The Dharwar craton is divided into western (WDC) and eastern (EDC) parts (separated possibly by the Closepet Granite Batholith), based on lithologi-cal differences and inferred metamorphic and magmatic genetic events. A tentative evolution of the WDC encompasses an early, ca. 3.5 Ga protocrust possibly forming the basement to the ca. 3.35-3.2 Ga Sargur Group greenstone belts. The latter are interpreted as having formed through accretion of plume-related ocean plateaux. The approximately coeval Peninsular Gneiss Complex (PGC) was possibly sourced from beneath plateau remnants, and resulted in high-grade metamorphism of Sargur Group belts at ca. 3.13-2.96 Ga. At about 2.9-2.6 Ga, the Dharwar Supergroup formed, comprising lower Bababudan (largely braided fluvial and subaerial volcanic deposits) and upper Chitradurga (marine mixed clastic and chemical sedimentary rocks and subaqueous volcanics) groups. This supergroup is preserved in younger greenstone belts with two distinct magmatic events, at 2.7-2.6 and 2.58-2.54 Ga, the latter approximately coincident with ca. 2.6-2.5 Ga granitic magmatism which essentially completed cratonization in the WDC. The EDC comprises 2.7-2.55 Ga tonalite-trondhjemitegranodiorite (TTG) gneisses and migmatites, approximately coeval greenstone belts (dominated by volcanic lithologies), with minor inferred remnants of ca. 3.38-3.0 Ga crust, and voluminous 2.56-2.5 Ga granitoid intrusions (including the Closepet Batholith). An east-to-west accretion of EDC island arcs (or of an assembled arc -granitic terrane) onto the WDC is debated, with a postulate that the Closepet Granite accreted earlier onto the WDC as part of a "central Dharwar" terrane. A final voluminous granitic cratonization event is envisaged to have affected the entire, assembled Dharwar craton at ca. 2.5 Ga. When Dharwar evolution is compared with that of Kaapvaal, while possibly global magmatic events and freeboard-eustatic changes at ca. 2.7-2.5 Ga may be identified on both, the much earlier cratonization (by ca. 3.1 Ga) of Kaapvaal contrasts strongly with the ca. 2.5 Ga stabilization of Dharwar. From comparing only two cratons, it appears that genetic and chronologic relationships between mantle thermal and plate tectonic processes were complex on the Archaean Earth. The sizes of the Kaapvaal and Dharwar cratons might have been too limited yet to support effective thermal blanketing and thus accommodate Wilson Cycle onset. However, tectonically driven accretion and amalgamation appear to have predominated on both evolving cratons.Résumé : L'histoire géologique et l'évolution du craton de Dharwar (ϳ3,5-2,5 Ga) sont examinées et sommairement comparées a` celles d'un second craton, celui de Kaapvaal, afin de permettre une certaine spéculation sur la nature des régimes tectoniques globaux duran...

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“…The greenstone belts in the WDC are thick, widely distributed and dominated by sedimentary sequences compared to the greenstone belts in the EDC. Two generation of greenstone sequences can be recognized in the WDC, older Sargur Group (>3.0 Ga) and younger Dharwar Supergroup (2.9-2.5 Ga) (Hokada et al, 2013). The age data of the greenstone sequences in the EDC are scarce and mostly correlated with the younger Dharwar Supergroup of WDC (Fig.…”

Section: Geological Settingmentioning

confidence: 97%

SHRIMP U–Pb zircon ages of granitoids adjacent to Chitradurga shear zone, Dharwar craton, South India and its tectonic implications

Nasheeth

Okudaira

Horie

et al. 2015

Journal of Mineralogical and Petrological Sciences

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We report newly obtained U-Pb SHRIMP ages of zircons from the granitoids in the vicinity of Chitradurga shear zone of Dharwar craton, South India. The analyses yielded two different ages, an older age of ca. 3300 Ma and younger ages of~2600-2650 Ma, those suggest two major igneous activities in the study area. The former activity contemporaneous with the formation of Mesoarchean (~3.3 Ga) basement rocks (i.e., Peninsular Gneiss) and the latter reflects the Neoarchean (~2.6 Ga) regional plutonic activity in the Western Dharwar craton. Field and petrographic observations suggest that the intensity of deformation is high at the boundary between amphibolites and granitoids. Our new age dates imply that the formation of Chitradurga shear zone postdated the magmatic activity in the study area and the deformation structures possibly related to the development of Chitradurga shear zone. The area on either sides of the boundary between Eastern and Western Dharwar cratons experienced a Neoproterozoic event between 700-600 Ma indicated by prominent SHRIMP lower intercepts.

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An appraisal of Archaean supracrustal sequences in Chitradurga Schist Belt, Western Dharwar Craton, Southern India

Cited by 107 publications

References 51 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

A review of the inferred geodynamic evolution of the Dharwar craton over the ca. 3.5–2.5 Ga period, and possible implications for global tectonics

SHRIMP U–Pb zircon ages of granitoids adjacent to Chitradurga shear zone, Dharwar craton, South India and its tectonic implications

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