Sodicgedrite in ultrahigh-temperature Mg-Al-rich rocks from the Palghat-Cauvery Shear Zone system, southern India

Tsunogae, Toshiaki; Santosh, M.; Shimpo, Makoto

doi:10.2465/jmps.060824

Cited by 16 publications

(12 citation statements)

References 12 publications

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“…2) (e.g. Koshimoto et al, 2004;Shimpo et al, 2006;Santosh et al, 2004;Tsunogae et al, 2007Tsunogae et al, , 2008aNishimiya et al, 2008Nishimiya et al, , 2010Ohyama et al, 2008;Kanazawa et al, 2009;Sato et al, 2009;Tsunogae and Santosh, 2010). For example, metamorphic P-T trajectories including prograde high-pressure metamorphism, peak UHT metamorphism, and subsequent isothermal decompression for the PCSZ system were confirmed from Al-Mg granulites with moderateMg (Fe 0.5 Mg 0.5 ) staurolite inclusions in poikiloblastic garnets (Shimpo et al, 2006;Tsunogae and Santosh, 2006;Tsunogae et al, 2008a;Sato et al, 2009;Nishimiya et al, 2010) and also from an experimental study on the magnesian (Fe 0.7 Mg 0.3 ) staurolite composition in the system FeO-MgO-Al 2 O 3 -SiO 2 -H 2 O (Sato et al, 2010b).…”

Section: Geological Backgroundmentioning

confidence: 99%

Subduction–accretion–collision history along the Gondwana suture in southern India: A laser ablation ICP-MS study of zircon chronology

Sato

Santosh

Tsunogae

et al. 2011

Journal of Asian Earth Sciences

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a b s t r a c tWe report the petrological characteristics and preliminary zircon geochronology based on laser ablation ICP mass spectrometry of the various units in an accretionary belt within the Palghat-Cauvery Shear/ Suture Zone in southern India, a trace of the Cambrian Gondwana suture. Zircons extracted from a plagiogranite in association with an ophiolite suite within this suture possess internal structure that suggests magmatic crystallization, and yield mid Neoproterozoic 206 Pb/ 238 U age of 817 ± 16 Ma (error: 1r) constraining the approximate timing of birth of the Mozambique Ocean floor. Compiled age data on zircons separated from a quartzite and metamorphosed banded iron formation within the accretionary belt yields a younger intercept age of 759 ± 41 Ma (error: 1r) which we relate to a mid Neoproteozoic magmatic arc. Detrital zircons extracted from the quartzite yield 207 Pb/ 206 Pb age peaks of about 1.9-2.6 Ga suggesting that they were sourced from multiple protolithis of Neoarchean and Paleoproterozoic. Metamorphic overgrowths on some zircon grains record ca. 500-550 Ma ages which are in good harmony with the known ages for the timing of high-grade metamorphism in this zone during the final stage of continent collision associated with the birth of the Gondwana supercontinent in the latest NeoproterozoicCambrian. The preliminary geochronological results documented in our study correlate with the subduction-accretion-collision history associated with the closure of the Mozambique Ocean and the final amalgamation of the Gondwana supercontinent.

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Section: Geological Backgroundmentioning

confidence: 99%

Subduction–accretion–collision history along the Gondwana suture in southern India: A laser ablation ICP-MS study of zircon chronology

Sato

Santosh

Tsunogae

et al. 2011

Journal of Asian Earth Sciences

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“…Most of the recent petrological studies in the region focused on UHT metamorphosed Mg‐Al granulites and high‐pressure mafic granulites distributed within an area of 30–40 km surrounding Karur town in the Tamil Nadu State (Figure 1) (e.g. Koshimoto et al ., 2004; Santosh et al ., 2004; Shimpo et al ., 2006; Tsunogae et al ., 2007, 2008; Kanazawa et al ., 2009; Sato et al ., 2009; Nishimiya et al ., 2010; Tsunogae and Santosh, 2010). These studies have defined metamorphic P‐T trajectories including prograde high‐pressure metamorphism, peak UHT metamorphism and subsequent isothermal decompression for Mg‐Al granulites containing high‐Mg (Fe 0.5 Mg 0.5 ) staurolite inclusions in poikiloblastic garnets (Shimpo et al ., 2006; Tsunogae and Santosh, 2006; Tsunogae et al ., 2008; Sato et al ., 2009; Nishimiya et al ., 2010).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Abbreviations for the various blocks: DC, Archaean Dharwar Craton; SB, Salem Block (Northern Granulite Block); NGB, Nilgiri Granulite Block; MSB, Madras Granulite Block; MB, Madurai Block (Madurai Granulite Block); TGB, Trivandrum Granulite Block (Kerala Khondalite Belt); NCB, Nagarcoil Granulite Block; MSZ, Moyar Shear Zone; BSASZ, Bhavani-Salem-Attur Shear Zone(s); PCSZ, Palghat-Cauvery Shear/Suture Zone; ACSZ, Achankovil Shear/Suture Zone. Data sources of sample localities of Mg-Al UHT granulites: Koshimoto et al (2004); Santosh et al (2004); Shimpo et al (2006); Tsunogae et al (2007Tsunogae et al ( , 2008; Kanazawa et al (2009). The margins of the PCSZ are marked by a complex system of shear zones (i.e.…”

Section: Introductionmentioning

confidence: 99%

U‐Pb zircon geochronology of granites and charnockite from southern India: implications for magmatic pulses associated with plate tectonic cycles within a Precambrian suture zone

Sato¹,

Santosh²,

Chetty³

et al. 2011

Geological Journal

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The Palghat-Cauvery Suture Zone (PCSZ) in southern India marks the trace along which continental blocks were sutured during the Precambrian. We report here U-Pb geochronological data based on laser ablation ICP mass spectrometry for zircons in two granite plutons and an associated charnockite from within the PCSZ. The weighted mean of 206 Pb/ 238 U ages for a rapakivi granite from the southern part of the PCSZ yields 819 AE 26 Ma (error: 2s; N ¼ 13). On the other hand, a metamorphosed A-type granite and a charnockite from the central part of the PCSZ yield a markedly older upper intercept age of 2468 AE 36 Ma (error: 2s) and a lower intercept age of 588 AE 36 Ma (error: 2s). Our results provide important constraints on the Precambrian crustal evolution in the PCSZ and demonstrate: (1) Neoarchaean to early Palaeoproterozoic magmatism, generating A-type granites which we correlate with a major global crustal formation event; (2) mid Neoproterozoic magmatism, and generation of the rapakivi granite, probably associated with the subduction of the Mozambique Ocean floor; and (3) latest Neoproterozoic high-grade metamorphism (generating the charnockite) associated with the collisional amalgamation of the Gondwana supercontinent. Together with the previous geochronological data from the PCSZ and adjacent crustal blocks, our results provide information on magmatic pulses associated with the Archaean cratonization event, as well as the Neoproterozoic Wilson Cycle of the Mozambique Ocean culminating in continent-continent collision.

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“…(2000) because the Na content in gedrite is considered to be related to temperature conditions (Fischer et al. 1999; Tsunogae et al. 2007).…”

Section: Discussionmentioning

confidence: 99%

Permo–Triassic Barrovian‐type metamorphism in the ultrahigh‐temperature Kontum Massif, central Vietnam: Constraints on continental collision tectonics in Southeast Asia

et al. 2009

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The Kontum Massif in central Vietnam is composed of various metamorphic complexes including a high-temperature southern part (Kannak and Ngoc Linh complexes) and a low-to medium-temperature northern part (Kham Duc complex). The Kham Duc complex exhibits Barrovian-type medium-pressure metamorphism evidenced by kyanite-and/or staurolite-bearing metapelites. The garnet-gedrite-kyanite gneiss, which is the focus of the present study, preserves several mineral parageneses formed during a prograde and retrograde metamorphic history: staurolite + quartz in gedrite, garnet + gedrite + kyanite in the matrix, and spinel + cordierite symplectite between gedrite and sillimanite. The calculated semiquantitative petrogenetic grid reveals peak pressure conditions of 620-650°C at 1.1-1.2 GPa and peak temperature conditions of 730-750°C at 0.7-0.8 GPa. The monazite U-Th-Pb electron microprobe ages of the garnetgedrite-kyanite gneiss and associated gneisses yield 246 Ϯ 3 Ma for the Kham Duc complex, which is similar to the age of the high-to ultrahigh-temperature metamorphism in the adjacent Kannak and Ngoc Linh complexes of the southern Kontum Massif. The present results indicate that both the Barrovian-type and ultrahigh-temperature metamorphism occurred simultaneously in the Kontum Massif during an event strongly related to Permo-Triassic microcontinental collision tectonics in Asia.

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Sodicgedrite in ultrahigh-temperature Mg-Al-rich rocks from the Palghat-Cauvery Shear Zone system, southern India

Cited by 16 publications

References 12 publications

Subduction–accretion–collision history along the Gondwana suture in southern India: A laser ablation ICP-MS study of zircon chronology

Subduction–accretion–collision history along the Gondwana suture in southern India: A laser ablation ICP-MS study of zircon chronology

U‐Pb zircon geochronology of granites and charnockite from southern India: implications for magmatic pulses associated with plate tectonic cycles within a Precambrian suture zone

Permo–Triassic Barrovian‐type metamorphism in the ultrahigh‐temperature Kontum Massif, central Vietnam: Constraints on continental collision tectonics in Southeast Asia

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