Neoproterozoic arc magmatism in the southern Madurai Block, India: Subduction, relamination, continental outbuilding, and the growth of Gondwana

Santosh, M.; Hu, Chao-Nan; He, Xiao-Fang; Li, Shanshan; Tsunogae, Toshiaki; Shaji, E.; Indu, G.K.

doi:10.1016/j.gr.2016.12.009

Cited by 115 publications

(43 citation statements)

References 101 publications

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“…Another possibility is heat input from underplated mafic magmas, associated with the subduction‐related suturing of the crustal blocks. Abundant Late Neoproterozoic charnockitic and granitic intrusions also occur in this region, such as those reported from the southern margin of the Madurai Block (e.g., Santosh et al, ). We therefore infer that both radiogenic heat and magmatic heat input might have contributed to the long‐lived high‐grade metamorphism of the Trivandrum Block.…”

Section: Discussionmentioning

confidence: 61%

Pressure‐temperature‐time evolution of ultrahigh‐temperature granulites from the Trivandrum Block, southern India: Implications for long‐lived high‐grade metamorphism

Kadowaki

Tsunogae

et al. 2019

Geological Journal

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The Southern Granulite Terrane in India comprises a number of Archean to Neoproterozoic magmatic arcs and supracrustal units that underwent latest Neoproterozoic to Cambrian high‐grade metamorphism. Here, we present a new petrological and geochronological data from khondalites in the western part of the Trivandrum Block and discuss pressure‐temperature‐time (P–T–t) path of the block for unravelling the duration and heat source of high‐grade metamorphism. Phase equilibria modelling of the khondalite indicates peak P–T condition of 920°C–1,030°C and 6.0–7.6 kbar, suggesting ultrahigh‐temperature (UHT) metamorphism. Prograde and retrograde P–T conditions of ~750°C/~7 kbar and ~750°C/~4 kbar, respectively, were also obtained, based on which a clockwise P–T path with geotherm‐parallel slow cooling is inferred. Zircon and monazite U–Pb geochronology and rare‐earth elements (REE) patterns suggest that heavy rare‐earth elements (HREE)‐depleted zircons grew together with garnet during prograde partial melting at >810°C or during fluid activity at around 582 ± 17 Ma, which was followed by peak UHT metamorphism at 555.1 ± 8.1 Ma as inferred from the dominant monazite ages. Relatively HREE‐enriched zircons (527.3 ± 8.0 Ma) and monazites (501.9 ± 8.5 Ma) were probably formed by garnet breakdown during retrograde metamorphism. The growth of HREE‐enriched zircons at 489 ± 12 Ma might be related to later fluid infiltration and hydration of garnet to form biotite at <770°C/~4 kbar. Our results suggest that high‐grade metamorphism continued at least 90 Myr, from 582 to 489 Ma, suggesting a long‐lived thermal event possibly related to the input of radiogenic heat from the crust and/or magmatic heat from syntectonic to post‐tectonic intrusions.

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Section: Discussionmentioning

confidence: 61%

Pressure‐temperature‐time evolution of ultrahigh‐temperature granulites from the Trivandrum Block, southern India: Implications for long‐lived high‐grade metamorphism

Kadowaki

Tsunogae

et al. 2019

Geological Journal

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“…The Madurai Block (MB) in southern India is a composite collage of three sub‐blocks, with Neoarchean–Paleoproterozoic segments in the north and central domains and a Neoproterozoic segment in the south (Figure , Santosh et al, ). The present study area forms part of central MB, and the major rock types are hornblende biotite gneiss, representing the Peninsular Gneissic Complex, charnockite, and younger intrusions of gabbro and dolerite (Figure and GSI Report, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…Generalized geological map of the Southern Granulite Terrain in India showing major crustal blocks and the study area (after Collins, Clark, & Plavsa, ; Santosh et al, ; Santosh et al, ). MG: Mundanmudi gabbro; EIC: Ezhimala Igneous complex [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Introductionmentioning

confidence: 99%

Buds of Santonian magmatism associated with Marion hotspot in southern India

Shaji

Santosh

et al. 2018

Geological Journal

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Imprints of Marion hotspot magmatism representing the final stages of rifting between India and Madagascar from the Gondwana assembly occur scattered in several localities of southern India. In this study, we report evidence for rift‐related Santonian magmatism from alkali gabbro in the Madurai Block and present mineralogical, petrological, zircon U–Pb geochronological, and whole‐rock geochemical data on the Mundanmudi gabbroic complex. The rock shows mesocumulate textures with plagioclase laths forming the triple junctions and porphyritic texture with hornblende and clinopyroxene as phenocrysts. Geochemically, the gabbros are characterized by moderate to high SiO2 (50–58 wt.%), alkalies (4.14–7.00 wt.%), and high TiO2 (1.71–4.22 wt.%), with calc‐alkaline to high‐K alkaline affinity. Chondrite‐normalized REE patterns are highly fractionated with LREE enrichment relative to HREE and absence of Eu anomalies. The primitive mantle normalized trace element patterns have LILE enrichment relative to HFSE, exhibiting negative anomalies at Nb, Zr, and Ti. The HFSE relationships indicate a within‐plate tectonic setting for the genesis of these gabbros. The major element tectonic discrimination plots suggest MORB‐OFB affinity which is also supported by the Nb–Th relationship endorsing the divergent tectonic processes responsible for the generation of these gabbros. The zircon U–Pb mean age of ca. 85 Ma represents the magmatic emplacement age within a rift‐related tectonic setting during the Santonian (late Cretaceous). Based on the LREE and HREE relationship, it is inferred that the parental magma might have been derived at garnet lherzolite depths above the Marion plume, possibly correlatable with the large igneous province generated at this time in Madagascar. Our study provides new evidence for the final phase of the magmatism at ca. 85 Ma related to India–Madagascar rifting.

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“…VFZ, a trans- Figure 1. Generalized tectonic framework of Southern India illustrating major crustal blocks and intervening shear/suture zones (after [Collins et al, 2014;Santosh et al, 2015Santosh et al, , 2017.…”

Section: Study Area and Regional Geologymentioning

confidence: 99%

An integrated approach on satellite geodesy data to delineate morphotectonic and neotectonic activities in the West Coast off Kerala, Southern India

Girishbai¹,

Bhadran²

2018

Russ. J. Earth Sci.

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Neoproterozoic arc magmatism in the southern Madurai Block, India: Subduction, relamination, continental outbuilding, and the growth of Gondwana

Cited by 115 publications

References 101 publications

Pressure‐temperature‐time evolution of ultrahigh‐temperature granulites from the Trivandrum Block, southern India: Implications for long‐lived high‐grade metamorphism

Pressure‐temperature‐time evolution of ultrahigh‐temperature granulites from the Trivandrum Block, southern India: Implications for long‐lived high‐grade metamorphism

Buds of Santonian magmatism associated with Marion hotspot in southern India

An integrated approach on satellite geodesy data to delineate morphotectonic and neotectonic activities in the West Coast off Kerala, Southern India

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