U–Pb zircon chronology of the Pangidi–Kondapalle layered intrusion, Eastern Ghats belt, India: Constraints on Mesoproterozoic arc magmatism in a convergent margin setting

Rao, C.V. Dharma; Santosh, M.; Dong, Yunpeng

doi:10.1016/j.jseaes.2011.07.005

Cited by 45 publications

(5 citation statements)

References 37 publications

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“…Ages between c . 1,650 and 1,600 Ma seemingly coincide with ages for granite and charnockite emplacement in the Ongole Domain (Dharma Rao, Santosh, & Dong, ; Kovach et al., ; Simmat & Raith, ). Similar inherited ages from arc‐related magmatism (Figure b) are found in zircon cores from the RC, with felsic magmatism at c .…”

Section: Discussionmentioning

confidence: 53%

“…Inherited zircon ages in the EGP record a series of concordant clusters and discordant trends associated with ages at c. 1,650-1,600 Ma and c. 1,900-1,800 Ma throughout the highland localities (Das et al, 2011;Korhonen et al, 2015). Ages between c. 1,650 and 1,600 Ma seemingly coincide with ages for granite and charnockite emplacement in the Ongole Domain (Dharma Rao, Santosh, & Dong, 2012;Kovach et al, 2001;Simmat & Raith, 2008). Similar inherited ages from arc-related magmatism (Figure 14b) are found in zircon cores from the RC, with felsic magmatism at c. 1,600 Ma in the Oygarden group, and charnockite emplacement at c. 2,100-1,800 Ma along the Mawson Coast (Halpin et al, 2005) and NPCM (Zhao, Ellis, Kilpatrick, & McCulloch, 1997).…”

Section: Regional Geological Contextmentioning

confidence: 79%

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Neoproterozoic evolution and Cambrian reworking of ultrahigh temperature granulites in the Eastern Ghats Province, India

Mitchell

Johnson

Clark

et al. 2018

Journal Metamorphic Geology

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The time‐scales and P–T conditions recorded by granulite facies metamorphic rocks permit inferences about the geodynamic regime in which they formed. Two compositionally heterogeneous cordierite–spinel‐bearing granulites from Vizianagaram, Eastern Ghats Province (EGP), India, were investigated to provide P–T–time constraints using petrography, phase equilibrium modelling, U–Pb geochronology, the rare earth element composition of zircon and monazite, and Ti‐in‐zircon thermometry. These ultrahigh temperature (UHT) granulites preserve discrete compositional layering in which different inferred peak assemblages are developed, including layers bearing garnet–sillimanite–spinel, and others bearing orthopyroxene–sillimanite–spinel. These mineral associations cannot be reproduced by phase equilibrium modelling of whole‐rock compositions, indicating that the samples became domainal on a scale less than that of a thin section, even at UHT conditions. Calculation of the P–T stability fields for six compositional domains within which the main rock‐forming minerals are considered to have attained equilibrium suggests peak metamorphic conditions of ~6.8–8.3 kbar at ~1,000°C. In most of these domains, the subsequent evolution resulted in the growth of cordierite and final crystallization of melt at an elevated (residual) H2O‐undersaturated solidus, consistent with <1 kbar of decompression. Concordant U–Pb ages obtained by SHRIMP from zircon (spread 1,050–800 Ma) and monazite (spread 950–800 Ma) demonstrate that crystallization of these minerals occurred during an interval of c. 250 Ma. By combining LA‐ICP‐MS U–Pb zircon ages with Ti‐in‐zircon temperatures from the same analysis sites, we show that the crust may have remained above 900°C for a minimum of c. 120 Ma between c. 1,000 and c. 880 Ma. Overall, the results suggest that, in the interval 1,050 to 800 Ma, the evolution of the Vizianagaram granulites culminated with UHT conditions from c. 1,000 Ma to c. 880 Ma, associated with minor decompression, before further zircon crystallization at c. 880–800 Ma during cooling to the solidus. However, these rocks are adjacent to the Paderu–Anantagiri–Salur crustal block to the NW that experienced counterclockwise P–T–t paths, and records similar UHT peak metamorphic conditions (7–8 kbar, ~950°C) followed by near‐isobaric cooling, and has a similar chronology during the Neoproterozoic. The limited decompression inferred at Vizianagaram may be explained by partial exhumation due to thrusting of this crustal block over the adjacent Paderu–Anantagiri–Salur crustal block. The residual granulites in both blocks have high concentrations of heat‐producing elements and likely remained hot at mid‐crustal depths throughout a period of relative tectonic quiescence in the interval 800–550 Ma. During the Cambrian Period, the EGP was located in the hinterland of the Denman–Pinjarra–Prydz orogen. A later concordant population of zircon dated at 511 ± 6 Ma records crystallization at temperatures of ~810°C. This age may record a low‐degree of...

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Section: Discussionmentioning

confidence: 53%

Section: Regional Geological Contextmentioning

confidence: 79%

Neoproterozoic evolution and Cambrian reworking of ultrahigh temperature granulites in the Eastern Ghats Province, India

Mitchell

Johnson

Clark

et al. 2018

Journal Metamorphic Geology

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“…However, recently the emplacement of the Kondapalle layered complex has been dated (U–Pb zircon ages) at c . 1.69–1.63 Ga (Dharma Rao et al ., ). This information indirectly suggested that there are different generations of meta‐igneous rocks in the region and a more systematic geochronological study was required.…”

Section: Geochronology – Dating the Age Of Magmatic Formation And Metmentioning

confidence: 97%

“…The magmatic rocks of the adjoining Vinjamuru domain that formed between 1.87 and 1.78 Ga (Ravikant et al ., ), may have contributed to the detrital zircon in the Ongole metasedimentary rocks. Continued subduction was inferred to have resulted in renewed magmatism (charnoenderbites and Kondapalle Layered Complex; Dharma Rao et al ., ; Sarkar et al ., ) in the latest Palaeoproterozoic ( c . 1.63–1.60 Ga), leading to UHT metamorphism of the arc‐related granitoids and the sediments at the same time.…”

Section: Geodynamic Setting Of the Ongole Domainmentioning

confidence: 99%

“…1.85–1.33 Ga) long‐lived active continental margin along the southeastern margin of India, generating subduction‐related arc magmas (Kondapalle layered Complex at c . 1.6 Ga; Dharma Rao et al ., ) and terminating in continental collision with the Napier Complex of East Antarctica in the Neoproterozoic ( c . 1.0 Ga) related to the amalgamation of the supercontinent Rodinia.…”

Section: Geodynamic Setting Of the Ongole Domainmentioning

confidence: 99%

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Early Mesoproterozoic (1.6–1.5 Ga) granulite facies events in the Ongole domain: geodynamic significance and global correlation

Sarkar

Schenk²

2016

Journal Metamorphic Geology

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The late Palaeoproterozoic to early Mesoproterozoic Ongole domain of the Eastern Ghats Belt in southeastern India is composed of a suite of charnoenderbites with enclaves of metapelitic and mafic granulites. Geochemical data for all meta‐igneous rocks are typical for continental magmatic arc suites. The rocks preserve mineral assemblages and reaction textures indicating two separate metamorphic events: an initial counter‐clockwise medium‐pressure ultrahigh temperature (MP−UHT) event (>900 °C at 6.5–7.0 kbar), attributed to the magmatic accretion of the arc, which was followed by a clockwise HP‐MT event (~700 °C at 9 kbar), attributed to its tectonic crustal thickening. Zircon dating of charnoenderbites yield magmatic crystallization ages between 1.75 and 1.70 Ga and metamorphic ages between 1.62 and 1.60 Ga. Syn‐metamorphic enderbites yield magmatic and metamorphic zircon ages of c. 1.60 Ga, overlapping with all other metamorphic rim ages. In contrast, texturally controlled monazite dating of two chemically distinct monazite generations reveals two metamorphic events at c. 1.62 and c. 1.54 Ga. These data suggest that the Ongole domain was formed as a magmatic arc during the Palaeoproterozoic (c. 1.75–1.70 Ga), and subsequently experienced UHT metamorphism accompanied by syn‐metamorphic intrusions at c. 1.60 Ga, suggesting magmatic underplating as the metamorphic heat source. The subsequent crustal thickening at c. 1.54 Ga was due to the collision of the Ongole magmatic arc with the Indian craton. The UHT metamorphism and the related orogenic processes of the Ongole domain fall into the assumed late Palaeoproterozoic to late Mesoproterozoic ‘orogenic and UHT time gap’ (1.8–1.1 Ga) regarded by some studies as an orogenic quiescent period after the formation of the Palaeoproterozoic supercontinent known as Columbia or Nuna at c. 2.1–1.8 Ga. Coeval orogenic processes at c. 1.7–1.5 Ga occurring along accretionary margins in different fragments of Columbia (India, Australia, Antarctica and southwest Africa) indicate a protracted formation of this supercontinent.

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Mesoproterozoic Eastern Ghat Mobile Belt

Valdiya

2015

Society of Earth Scientists Series

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U–Pb zircon chronology of the Pangidi–Kondapalle layered intrusion, Eastern Ghats belt, India: Constraints on Mesoproterozoic arc magmatism in a convergent margin setting

Cited by 45 publications

References 37 publications

Neoproterozoic evolution and Cambrian reworking of ultrahigh temperature granulites in the Eastern Ghats Province, India

Neoproterozoic evolution and Cambrian reworking of ultrahigh temperature granulites in the Eastern Ghats Province, India

Early Mesoproterozoic (1.6–1.5 Ga) granulite facies events in the Ongole domain: geodynamic significance and global correlation

Mesoproterozoic Eastern Ghat Mobile Belt

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