U‐Pb Ages for Zircon and Titanite from the Ramagiri Area, Southern India: Evidence for Accretionary Origin of the Eastern Dharwar Craton during the Late Archean

Balakrishnan, S.; Rajamani, V.; Hanson, Gilbert N.

doi:10.1086/314331

Cited by 152 publications

(78 citation statements)

References 41 publications

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“…Combinations of these two end-member models are suggested by a number of workers like [9] that included initial subduction fol- Kolar greenstone belt consists of komatiites, tholeiites, and dacites. Whereas, the Hutti is madeup of tholeiitic basalts, dacites, and rhyolite with rare occurrence of ultramafic rocks [16] [17]. The field observations, Rb-Sr and Sm-Nd isotope studies, geochemical studies are indicating the rocks are classified as basalt, basaltic andesite, andesite, dacite, and rhyolite [17].…”

Section: Geology Of the Dharwar Cratonmentioning

confidence: 99%

Petrological Characteristics of the Peddavura Schist Belt and Adjacent Rocks in Eastern Dharwar Craton in Parts of Nalgonda District, Telangana State

Pagidoju¹,

Naresh²,

Alwal³

2018

OJG

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The Peddavura greenstone Linear Belt, NW-SE trending, is formed in the Eastern part of the Dharwar Craton of south India, extended over 62.5 sq•km in Nalgonda and Guntur districts region. The entire belt is illustrated as Peninsular Gneiss. The Belt Study has attracted geologists for conducting further research to evaluate the crust forming process at the time of early volcanic eruption of Earth's history. The South Indian Dharwar Craton depicts and exposes the crustal segments where geological activities took place consistently during the Precambrian. The PSB (Peddavura Schist Belt) mostly consists of meta volcanic (meta basalts), amphibolites, granites, dolerites, basaltic andesites, pegmatite and Banded Magnetite Quartzite's (BMQ) rock types. The 20 represented rock samples made for thin section studies. Based on the Petrological studies minerals are showing uralitization, saussuritization in the granite with mylonite structures, perthite and dolerite are showing heavy metal such as rutile and other opaque minerals (Magnetite, hematite, and typical pyrite crystal) are present in different represented rock samples. The minerals are showing different alteration zones along with microstructures. Using the Petrological studies the minerals and rock types are identified in the study region.

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Section: Geology Of the Dharwar Cratonmentioning

confidence: 99%

Petrological Characteristics of the Peddavura Schist Belt and Adjacent Rocks in Eastern Dharwar Craton in Parts of Nalgonda District, Telangana State

Pagidoju¹,

Naresh²,

Alwal³

2018

OJG

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“…In the WDC, TTG basement rocks (also known as Peninsular Gneiss) are abundant and accreted mainly during Mesoarchean time (Peucat et al, 1993) with some late Archean (~2.6 Ga) potassic plutons (Taylor et al, 1984;Nutman et al, 1996;Jayananda et al, 2006). The EDC is dominated by late Archean TTG gneisses and calc-alkaline to potassic granitoids (Balakrishnan et al, 1999;Nutman et al, 1996;Jayananda et al, 2000). The greenstone belts in the WDC are thick, widely distributed and dominated by sedimentary sequences compared to the greenstone belts in the EDC.…”

Section: Geological Settingmentioning

confidence: 99%

“…The uniformitarians proposed that the EDC formed as a result of accretion of a series of island arcs (e.g., Balakrishnan et al, 1999;Manikyamba et al, 2005;Naqvi et al, 2006) to the WDC through transpression. Chadwick et al (2000) suggests that the accretion of already formed island arcs and granitic plutons constituted a single landmass (i.e., Dharwar batholith) to the WDC, causing sin- Chardon et al, 2008) showing the locations and ages of Mesoarchean and Neoarchean granitoids referred to in the text.…”

Section: Geological Settingmentioning

confidence: 99%

“…Dharwar craton of South India represents one of the largest cratonic masses of Indian shield and preserves early crystalline basement rocks ranging in age from Mesoarchean to the early Paleoproterozoic (Peucat et al, 1995;Chadwick et al, 2000;Jayananda et al, 2000Jayananda et al, , 2006Jayananda et al, , 2008Balakrishnan et al, 1999), and covering an area of 4.5 × 10 5 km 2 (Ramakrishnan and Vaidyanadhan, 2010 and references therein). The tectonic context of the continental growth of the Dharwar craton is a subject of debate.…”

Section: Introductionmentioning

confidence: 99%

“…The tectonic context of the continental growth of the Dharwar craton is a subject of debate. Both the uniformitarian and non-uniformitarian models have been proposed to explain the geological framework of the craton (e.g., Balakrishnan et al, 1999;Chadwick et al, 1997Chadwick et al, , 2000Chadwick et al, , 2007Chardon et al, 2008Chardon et al, , 2011. In almost all the existing models, a North-South trending crustal scale shear zone known as Chitradurga shear zone is considered as the boundary between two juxtaposed subcratonic blocks namely the Eastern Dharwar craton (EDC) and the Western Dharwar craton (WDC).…”

Section: Introductionmentioning

confidence: 99%

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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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2.62 Ga high‐temperature metamorphism in the central part of the Eastern Dharwar Craton: implications for late Archaean tectonothermal history

et al. 2011

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Aluminous metasediments occurring in the central part of the Eastern Dharwar Craton (EDC), southern India, develop contrasting mineral assemblages in closely spaced domains. Detailed petrographic, mineral chemical and geothermobarometry showed 'peak' metamorphic conditions of 780-820°C and~5 kbar that resulted in partial melting of biotite-bearing protoliths. Initial bulk compositional heterogeneity and different degrees of melt extraction produced diverse restitic mineral assemblages. P-T pseudosections, constructed from effective bulk composition, and consideration of the sequence of mineral reactions, deduced from textural criteria, define a nearly isobaric heating-cooling P-T trajectory. Monazite in the metasediments has a detrital core age of 3161 ± 78 Ma and a metamorphic age of 2625 ± 26 Ma (EPMA chemical age), which is the first record of a pre-2500 Ma high temperature-low pressure metamorphism event in the EDC. Based on age contemporaneity with the 2.7-2.62 Ga hot juvenile magmas of tonalite-trondhjemite-granodiorite (TTG)-greenstone accretion and the deduced P-T history, we conclude that heat advecting from rising TTG magmas and mafic magmas (greenstones) as a consequence of mantle melting, resulted in a hot transient mid-crust during a major late Archaean tectonothermal event in the Eastern Dharwar Craton. All the phenomena are consistent with a recently proposed model involving an arc setting during ridge subduction and consequent opening of a slab window. This study therefore provides new constraints on the thermal evolution of the Eastern Dharwar Craton.

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U‐Pb Ages for Zircon and Titanite from the Ramagiri Area, Southern India: Evidence for Accretionary Origin of the Eastern Dharwar Craton during the Late Archean

Cited by 152 publications

References 41 publications

Petrological Characteristics of the Peddavura Schist Belt and Adjacent Rocks in Eastern Dharwar Craton in Parts of Nalgonda District, Telangana State

Petrological Characteristics of the Peddavura Schist Belt and Adjacent Rocks in Eastern Dharwar Craton in Parts of Nalgonda District, Telangana State

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

2.62 Ga high‐temperature metamorphism in the central part of the Eastern Dharwar Craton: implications for late Archaean tectonothermal history

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