Mesoarchean convergent margin processes and crustal evolution: Petrologic, geochemical and zircon U–Pb and Lu–Hf data from the Mercara Suture Zone, southern India

Amaldev, T.; Santosh, M.; Tang, Li; Baiju, K. R.; Tsunogae, Toshiaki; Satyanarayanan, M.

doi:10.1016/j.gr.2016.05.017

Cited by 38 publications

(15 citation statements)

References 109 publications

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“…Phase 3 records a further increase in sedimentary incorporation and therefore increased crustal thickening and burial. The Th/U data lend additional support to increasing tectonothermal activity during Phase 3, and this is further supported by a circa 3.0‐Ga age of metamorphism in the northern periphery of the Coorg Block, recording its accretion to Dharwar crust to the north (Amaldev et al, ). Such crustal‐accretion tectonic processes would drive increasing sedimentary incorporation into mid‐ to deep‐crustal magma source regions through burial.…”

Section: Discussionmentioning

confidence: 81%

Capturing the Mesoarchean Emergence of Continental Crust in the Coorg Block, Southern India

Santosh

2018

Geophysical Research Letters

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The emergence of Earth's continental crust above sea level is debated. To assess whether emergence can be observed at a regional scale, we present zircon U‐Pb‐Hf‐O isotope data from magmatic rocks of the Coorg Block, southern India. A 3.5‐Ga granodiorite records the earliest felsic crust in the region. Younger phases of magmatism at 3.37–3.27 and 3.19–3.14 Ga, comprising both reworked crust and juvenile material, record successive crustal maturation. We interpret an elevation in δ18O through time as an increase in both the amount of sediment recycling and hence, crustal thickening, as well as an increase in the emerged area of continental crust available for weathering. Geochemical signatures do not point to any apparent change in geodynamic regime. We interpret the isotopic evolution of these rocks as solely reflecting regional emergence and thickening of the continental crust, assisted by the increasing strength of the lithosphere.

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Section: Discussionmentioning

confidence: 81%

Capturing the Mesoarchean Emergence of Continental Crust in the Coorg Block, Southern India

Santosh

2018

Geophysical Research Letters

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“…1). The geology and age relationships of the high-grade terranes has been summarised by many authors (e.g., Drury et al, 1984;Bhaskar Rao et al, 1996, 2003Ghosh et al, 2004;Chetty and Bhaskar Rao, 2006;Santosh et al, 2009a;Brandt et al, 2011;Tomson et al, 2006Tomson et al, , 2013Collins et al, 2014;Plavsa et al, 2012Plavsa et al, , 2015Amaldev et al, 2016;Vijaya Kumar et al, 2017). An anastomosing network of ductile shear zones, which comprise the crustal-scale Palghat Cauvery shear system-PCSS (referred to as the Cauvery Shear Zone system-CSZ in the earlier literature) constitute a prominent tectonic feature along the southern margin of the craton.…”

Section: Regional Geological Framework Of Dharwar Cratonmentioning

confidence: 99%

“…have been described from the Coorg, BR Hills and the Wynad region within the PCSS. In the Coorg massif, U-Pb zircon age data for meta igneous rocks (granitoids, charnockites, diorites and metavolcanic rocks) define magmatic events at 3.5, 3.2, 2.7 and 2.5-2.4 Ga, while metasedimentary rocks (quartzite, ferruginous quartzite, banded iron formation and calcareous / pellitic schists) indicate discrete zircon age populations between 3.4 and 1.3 Ga Amaldev et al, 2016). In the Biligiri Rangan massif, TTG orthogneisses and charnockites reveal zircon U-Pb ages of ca.…”

Section: Figure 2: a Schematic Of Correlation Of Sgt And Eggt With Grmentioning

confidence: 99%

A Review of Paleo- to Neoarchean crustal evolution in the Dharwar craton, Southern India and the transition towards a Plate Tectonic regime

et al. 2020

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“…The middle and upper Proterozoic strata are mainly distributed in cratonic rifts, sag basins, and the linear grabens, with limited distribution, little change in lithology, and low level of metamorphism. The shield structure is well reflected in the first detail field of the Bouguer anomaly, according to which the tectonic units of the IND basement can be divided (Amaldev et al, ; Verma & Bansal, ).…”

Section: Gravity and Magnetic Anomaly Response Of Paleoproterozoic Tementioning

confidence: 99%

Contrastive analysis of gravity and magnetic anomalies between North China Craton and Indian Shield

Cao

Jiang

et al. 2019

Geological Journal

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The evolution correlation between the North China Craton (NCC) and the Indian Shield (IND) is very important for plate reconstruction. Recently, more and more research results show that the NCC and IND had been pieced together in the Paleoproterozoic. In order to analyse the correlation between the NCC and IND, we use the latest gravity and magnetic data to study deep geophysical characteristics of the NCC and IND respectively, and we also use a two‐dimensional discrete wavelet transform method to discuss the division scheme of the basement tectonic unit in the Paleoproterozoic at the point of gravity and magnetic field. On the basis of gravity and magnetic anomalies, the NCC is divided into the Eastern Block, Western Block, and the Trans‐North China Orogen, which are further divided into the secondary tectonic zones and blocks. The IND is divided into the Southern Block, the Northern Block, and the Central Indian Tectonic Zone, and they also are further divided into secondary tectonic zones and ancient cratons. On the basis of that, according to the four Paleoproterozoic plate assemblage schemes proposed by predecessors, we compared the geophysical characteristics and the correlation through the regional gravity and magnetic anomalies between the two continents. The results show that the faults and tectonic boundaries in the Trans‐North China Orogen of the NCC correspond well to those in the Central Indian Tectonic Zone of IND. Moreover, the gravitational and magnetic anomalies in the Eastern Block of the NCC are quite similar to those in the Southern Block of IND, which shows that the NCC and IND might have been pieced together during the Paleoproterozoic. The geophysical result that verifies the correlation between the NCC and IND based on gravity and magnetic fields provides the evidence for Paleoproterozoic plate reconstruction and constrains the assembling patterns between the NCC and the IND.

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Mesoarchean convergent margin processes and crustal evolution: Petrologic, geochemical and zircon U–Pb and Lu–Hf data from the Mercara Suture Zone, southern India

Cited by 38 publications

References 109 publications

Capturing the Mesoarchean Emergence of Continental Crust in the Coorg Block, Southern India

Capturing the Mesoarchean Emergence of Continental Crust in the Coorg Block, Southern India

A Review of Paleo- to Neoarchean crustal evolution in the Dharwar craton, Southern India and the transition towards a Plate Tectonic regime

Contrastive analysis of gravity and magnetic anomalies between North China Craton and Indian Shield

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