Linking monazite geochronology with fluid infiltration and metamorphic histories: Nature and experiment

Shazia, J.R.; Harlov, Daniel E.; Suzuki, Koji; Kim, S.W.; Girish-Kumar, M.; Hayasaka, Yasutaka; Ishwar-Kumar, C.; Windley, Brian F.; Sajeev, K.

doi:10.1016/j.lithos.2015.08.008

Cited by 31 publications

(7 citation statements)

References 68 publications

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“…Finger and Krenn 2007;Holder et al 2015;Kohn et al 2005;Williams et al 2011) and laboratory experiments (e.g. Budzyń et al 2011Budzyń et al , 2017Harlov et al 2011;Seydoux-Guillaume et al 2012;Shazia et al 2015). No relationship between Group 3 and the other monazite populations are observed.…”

Section: Timing Of Events Recorded By Monazitementioning

confidence: 84%

High-spatial resolution dating of monazite and zircon reveals the timing of subduction–exhumation of the Vaimok Lens in the Seve Nappe Complex (Scandinavian Caledonides)

Barnes

Majka

Schneider

et al. 2018

Contrib Mineral Petrol

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In-situ monazite Th-U-total Pb dating and zircon LA-ICP-MS depth-profiling was applied to metasedimentary rocks from the Vaimok Lens in the Seve Nappe Complex (SNC), Scandinavian Caledonides. Results of monazite Th-U-total Pb dating, coupled with major and trace element mapping of monazite, revealed 603 ± 16 Ma Neoproterozoic cores surrounded by rims that formed at 498 ± 10 Ma. Monazite rim formation was facilitated via dissolution-reprecipitation of Neoproterozoic monazite. The monazite rims record garnet growth as they are depleted in Y 2 O 3 with respect to the Neoproterozoic cores. Rims are also characterized by relatively high SrO with respect to the cores. Results of the zircon depth-profiling revealed igneous zircon cores with crystallization ages typical for SNC metasediments. Multiple zircon grains also exhibit rims formed by dissolution-reprecipitation that are defined by enrichment of light rare earth elements, U, Th, P, ± Y, and ± Sr. Rims also have subdued Eu anomalies (Eu/Eu* ≈ 0.6-1.2) with respect to the cores. The age of zircon rim formation was calculated from three metasedimentary rocks: 480 ± 22 Ma; 475 ± 26 Ma; and 479 ± 38 Ma. These results show that both monazite and zircon experienced dissolution-reprecipitation under high-pressure conditions. Caledonian monazite formed coeval with garnet growth during subduction of the Vaimok Lens, whereas zircon rim formation coincided with monazite breakdown to apatite, allanite and clinozoisite during initial exhumation.

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Section: Timing Of Events Recorded By Monazitementioning

confidence: 84%

High-spatial resolution dating of monazite and zircon reveals the timing of subduction–exhumation of the Vaimok Lens in the Seve Nappe Complex (Scandinavian Caledonides)

Barnes

Majka

Schneider

et al. 2018

Contrib Mineral Petrol

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“…Monazite and zircon ages of 0.63-0.47 Ga imply a long metamorphic history (Braun and Bröker, 2004;Ghosh et al, 2004;Braun and Appel, 2006;Taylor et al, 2014). Ages > 600 Ma are enigmatic, but combined U-Pb and trace-element data constrain the high-T event between prograde garnet growth at 0.59-0.57 Ga and melt crystallisation at 0.54-0.51 Ga, followed by a regional hydrothermal overprint at 0.50-0.49 Ga (Harley and Nandakumar, 2014;Taylor et al, 2014Shazia et al, 2015).…”

Section: Metamorphism Between the Suturesmentioning

confidence: 99%

Pan–African granulites of Madagascar and southern India: Gondwana assembly and parallels with modern Tibet

Fitzsimons

2016

Journal of Mineralogical and Petrological Sciences

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Granulites of the southern East African Orogen formed by continental collision during Gondwana assembly. The highest metamorphic gradients of 25-50°C km −1 were attained at 0.58-0.53 Ga in a microcontinental block that was sandwiched between two collisional sutures and is now exposed in Madagascar and southern India. The 50 Myr duration of extreme pressure-temperature (P-T) conditions and lack of coeval mantle magmatism suggest that metamorphism was driven by radiogenic heat accumulation beneath a long-lived orogenic plateau. Bounding sutures most likely record transfer of this microcontinent across the Neoproterozoic Mozambique Ocean, analogous to Gondwanan terranes that crossed Tethys before final India-Asia collision and, like Tibet, these sutures mark the edges of a plateau that formed following terminal ocean closure and collision. Both sutures record moderate metamorphic gradients of 15-25°C km −1 but with quite different ages. Metamorphism along the western suture at 0.65-0.61 Ga followed the end of magmatism in an adjacent 0.85-0.65 Ga ocean-arc terrane. It has an anti-clockwise P-T path that reflects preferential thickening of the hot arc during early stages of collision, and dates ocean closure at the western suture. Metamorphism along the eastern suture at 0.53-0.51 Ga has a clockwise P-T path and is widely assumed to date terminal collision in the East African Orogen. However, this event was coeval with rapid exhumation of granulites in the adjacent plateau and is more likely to reflect reactivation of a much older eastern suture during plateau collapse. Great care should be taken when using metamorphism to date ocean closure in ancient orogens. Rocks with hot metamorphic gradients give poor age constraints on initial collision because peak T is attained >50 Myr after ocean closure if radioactivity is a major part of the heat budget. Suture zone rocks with moderate metamorphic gradients can provide more reliable estimates for the time of ocean closure but are also prone to later reactivation in orogens with protracted histories.

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“…Santosh et al (2003) reported zircon cores from various ortho-and para-gneisses in the Madurai block with U-Th-Pb ages of 1700 Ma mantled by successive rims at 820 and 580 Ma. Shazia et al (2015) identified similarly aged monazite cores,~1700 Ma, from the Kodaikanal region. Santosh et al (2006) reported peak metamorphic monazite EPMA ages in the range of~550-520 Ma from the Spr-bearing granulites of Ganguvarpatti and the southern Palghat-Cauvery shear zone, which were interpreted as the timing of peak UHT metamorphism.…”

Section: Geochronological Constraints From Other Gondwana Fragmentsmentioning

confidence: 94%

“…Goncalves et al (2004) reported monazite U-Th-Pb ages from the Spr-Qz granulites of Northcentral Madagascar. Although the authors interpreted Archean ages from monazite cores as dating the peak metamorphic event, recent studies clearly show that monazite can also preserve detrital cores (e.g., Shazia et al 2015). Thus, the major age peaks of 788-732 Ma and~577 Ma can be reinterpreted as the detrital core and peak UHT metamorphism.…”

Section: Geochronological Constraints From Other Gondwana Fragmentsmentioning

confidence: 99%

“…Prakash (2010) reported~550 and ~530 Ma metamorphism of a~2509 Ma protolith using U-Pb zircon dating of Spr-bearing granulites and GrtCrd gneisses of the northwestern Madurai Block. Shazia et al (2015) interpreted CHIME monazite ages of 540-520 Ma from metapelites of Kodaikanal as giving the time of peak metamorphism. George et al (2015) used U-Pb zircon data to date peak UHT metamorphism of Spr-Qtz-bearing granulites from Rajapalayam at~561 Ma, with detrital zircon ages ranging from 2300-800 Ma.…”

Section: Geochronological Constraints From Other Gondwana Fragmentsmentioning

confidence: 99%

See 1 more Smart Citation

UHT granulites of the Highland Complex, Sri Lanka II: Geochronological constraints and implications for Gondwana correlation

Osanai

Sajeev²,

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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The regional ultrahigh-temperature (UHT) metamorphism of the Highland Complex, Sri Lanka is well established and has an important role in our understanding of the tectonic history of the Gondwana supercontinent. U-Pb zircon dating of sapphirine-bearing Mg-Al granulites yielded two major metamorphic age populations at approximately 620-590 and 563-525 Ma with no evidence of older zircon cores. Pelitic granulite samples with a Grt-Sil-Spl-Crd assemblage have similar metamorphic ages with concordant data clusters at~602, 563, and 526 Ma and inherited zircon cores aged from 2040 to 1600 Ma. The pelitic granulites also underwent two stages of metamorphism (565-520 and 622-580 Ma). Some of these pelitic granulite samples have inherited zircon cores ranging from 3060 to 760 Ma. Zircons in mafic granulite samples have age ranges of 566-533 and 620-578 Ma. A calc-silicate granulite sample also has similar age populations at 591, 541, and 524 Ma. Combining these new results with previously published ages from Sri Lanka and formerly adjacent continental fragments of Gondwana, we propose that the terranes in southern Madagascar (south of Ranotsara Shear Zone), Northern and Southern Madurai and the Trivandrum Blocks of southern India, the Highland Complex of Sri Lanka, and the Skallen Group in the Lützow-Holm Complex of East Antarctica represent a unique metamorphic belt that regionally experienced the Ediacaran-Cambrian UHT event during the amalgamation of the Gondwana supercontinent.

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Linking monazite geochronology with fluid infiltration and metamorphic histories: Nature and experiment

Cited by 31 publications

References 68 publications

High-spatial resolution dating of monazite and zircon reveals the timing of subduction–exhumation of the Vaimok Lens in the Seve Nappe Complex (Scandinavian Caledonides)

High-spatial resolution dating of monazite and zircon reveals the timing of subduction–exhumation of the Vaimok Lens in the Seve Nappe Complex (Scandinavian Caledonides)

Pan–African granulites of Madagascar and southern India: Gondwana assembly and parallels with modern Tibet

UHT granulites of the Highland Complex, Sri Lanka II: Geochronological constraints and implications for Gondwana correlation

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