Neoproterozoic arc accretion along the ‘eastern suture’ in Sri Lanka during Gondwana assembly

He, Xiao-Fang; Santosh, M.; Tsunogae, Toshiaki; Malaviarachchi, Sanjeewa P.K.; Dharmapriya, P.L.

doi:10.1016/j.precamres.2016.04.006

Cited by 56 publications

(32 citation statements)

References 95 publications

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“…In the present study, the oscillatory zoned and transgressive detrital cores of zircons from the SWHC gave the oldest ages of 3380-3220 Ma, indicating the detrital zircons in the SWHC potentially originated from several Paleoarchean sources, similar to the case of the CHC (Kröner et al, 1987;Pram and Pohl 1994;Santosh et al, 2014;Dharmapriya et al, 2015;Takamura et al, 2015;He et al, 2016aHe et al, , 2016b.…”

Section: Discussionsupporting

confidence: 65%

“…In most of the zircon, the overgrowths in age range 6 shows Th/U ratio less than 0.1, which is reasonable to interpret them as product of the final metamorphic event (range 6; 630-500 Ma). The age range 6 has been also suggested by previous studies and considered as either parts of a single event or discrete thermal events (Kröner et al, 1987;Hölzl et al, 1991;Hölzl et al, 1994;Sajeev et al, 2010;Santosh et al, 2014;Dharmapriya, et al, 2015;Takamura et al, 2015;He et al, 2016aHe et al, , 2016b. Such thermal events may contribute to form peripheral thin layers of overgrowths observed in zircon grains (Figs.…”

Section: Formation Of Overgrowthssupporting

confidence: 62%

“…Sajeev et al (2010) has given evidence of 1.7 Ga age clusters, episodes of zircon growth at 1.04-0.83 Ga and two generations of overgrowths in zircon at 569 ± 5 and 551 ± 7 Ma in quartz-saturated granulites. Their results also indicate that the Archean sediments of the CHC have undergone repeated thermal events (Santosh et al, 2014;Dharmapriya et al, 2015;Takamura et al, 2015;He et al, 2016aHe et al, , 2016b.…”

Section: Introductionmentioning

confidence: 89%

“…The Kadugannawa Complex consisting of hornblende gneiss, biotitehornblende gneiss, and migmatites occurs within elongate synformal basins around Kandy in central Sri Lanka (Cooray, 1994). The terrain subdivision introduced by Cooray (1994) have been widely followed in a number of petrological studies (e.g., Kehelpannala, 1997;Mathavan et al, 1999;Mathavan and Fernando, 2001;Kröner et al, 2003;Kröner et al, 2013;Dharmapriya et al, 2014;Santosh et al, 2014;He et al, 2016aHe et al, , 2016b.…”

Section: Introductionmentioning

confidence: 99%

“…According to studies by U-Pb zircon dating (Kröner et al, 1987;Santosh et al, 2014;Dharmapriya et al, 2015;Takamura et al, 2015;He et al, 2016aHe et al, , 2016b, Nd model ages (Milisenda et al, 1988(Milisenda et al, , 1994Pram and Pohl, 1994) and Sr model ages (Crawford and Oliver, 1969), the detritus of the metasediments in the CHC were derived from unidentified Archean to Proterozoic source terrains of 3.2-2.0 Ga in age, and peak metamorphism occurred around 610-550 Ma (Hölzl et al, 1991;Hölzl et al, 1994;Sajeev et al, 2010;Santosh et al, 2014;Dharmapriya et al, 2015;Takamura et al, 2015;He et al, 2016aHe et al, , 2016b. Baur et al (1991) and Hölzl et al (1994) obtained zircon upper intercept ages around 1900-1800 Ma for orthogneisses, which were interpreted as crystallization ages of the protoliths.…”

Section: Introductionmentioning

confidence: 99%

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Internal textures and U–Pb geochronology of zircons in metamorphic rocks from the Southwestern Highland Complex, Sri Lanka

Wanniarachchi

Akasaka

Hayasaka

et al. 2016

Journal of Mineralogical and Petrological Sciences

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Internal textures and U-Pb ages of zircons in garnet-biotite gneiss of the Southwestern Highland Complex (SWHC), Sri Lanka, were studied to clarify the repeated thermal events in the study area. The zircons from garnet-biotite gneiss consist of the detrital cores and overgrowths with two to five growth stages. The detrital zircon cores are rounded or euhedral to subhedral in shape, and show transgressive internal textures or oscillatory zoning.The rounded or subhedral to euhedral detrital core morphology suggests several major Archaean to Proterozoic sources of detritus zircons in the SWHC. Ages of the detrital cores are in a range of 3.3-1.7 Ga, and can be categorized into five ranges of 3380-3220, 2730-2660, 2550-2490, 2220-2170, and 1900-1700 Ma, implying the source rock ages. The detrital cores in the 3380-2170 Ma have Th/U-ratios of more than 0.3, suggesting igneous origin. The detrital cores in the range 1900-1700 Ma have Th/U of >0.3 or 0.3-0.1, suggesting an igneous or metamorphic origin. Some overgrowths with the ages in the ranges of 1900-1700 and 630-500 Ma have Th/U-ratios less than 0.1 implying that zircon growth corresponds to the thermal events. Zircons lacking detrital cores and having growth zones with characteristic metamorphic internal textures gave ages in a range of 630-500 Ma, implying the generation at the final granulite grade metamorphic event.

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Section: Discussionsupporting

confidence: 65%

Section: Formation Of Overgrowthssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Internal textures and U–Pb geochronology of zircons in metamorphic rocks from the Southwestern Highland Complex, Sri Lanka

Wanniarachchi

Akasaka

Hayasaka

et al. 2016

Journal of Mineralogical and Petrological Sciences

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Late Neoproterozoic–Early Palaeozoic stratigraphic succession, Western Himalaya, North Pakistan: Detrital zircon provenance and tectonic implications

et al. 2017

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This paper presents the first ever detrital zircon U–Pb–Hf isotopic study for the Late Neoproterozoic–Early Palaeozoic stratigraphic succession exposed in the Hazara Basin, Western Himalaya, North Pakistan. This time span represents the break‐up of the supercontinent Rodinia and final assembly of Gondwana. The detrital record of the Late Neoproterozoic succession indicates well‐mixed detritus shed from within the Indian Craton, especially the Central Indian provenance (including the Delhi Fold Belt, Aravalli Orogen, and Bundlekhand Craton). The εHf(t) values are mostly negative, and Hf TDMC ages are clustered at 2.0–2.4 Ga, which indicates the derivation from an ancient reworked crustal source. In addition, the presence of a few positive εHf(t) values in the Late Neoproterozoic sequence indicates addition of the juvenile crust that corresponds to the period of the Rodinia break‐up. However, dissimilarities with detrital signatures from the Australian continent may indicate break‐up of the Rodinia supercontinent and detachment of Australia from India prior to ~754 Ma, which is the depositional age of the Hazara Formation. In addition, the angular unconformity at the base of the Abbottabad Formation represents the compressional tectonics that might be associated with the Pan‐African (Indo‐Antarctic Craton collision with the East African Orogen during 800–700 Ma) orogeny. The presence of the metamorphism and deformation in the rocks below the unconformity supports such an event prior to deposition of the Early Palaeozoic Abbottabad Formation. Similarly, the appearance of the Pan‐African detritus in the Early Palaeozoic Abbottabad Formation could be due to closure of the ocean basin between Eastern and Western Gondwana along the Mozambique Suture. This provenance change may indicate the final assembly of supercontinent Gondwana.

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Neoproterozoic felsic magmatism in southern Kerala, India: The building blocks of Gondwana

et al. 2020

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The assembly of Gondwana supercontinent involved multiple stages of continent convergence during the Neoproterozoic including arc magmatism and final collisional metamorphism. Peninsular India occupies a key position in the Gondwana supercontinent assembly where widespread Neoproterozoic magmatic records are preserved. Here, we investigate representative felsic magmatic intrusions from the Achankovil Suture Zone that marks the boundary between the Madurai and Trivandrum crustal blocks. We present petrological, geochemical, and zircon U‐Pb and Lu‐Hf data from the Chengannur (CH) and Pathanapuram (PT) plutons. Petrographic studies on syenogranites from the CH pluton indicate I‐type features, and feldspar thermometry shows ultrahigh temperatures (~1,000°C) corresponding to similar temperatures reported for the surrounding metamorphic rocks. Geochemically, the PT suite displays island arc affinity, whereas the CH suite shows adakitic, oxidized A‐2 type features. In tectonic discrimination plots, the CH samples correspond to volcanic arc granite, whereas the PT samples traverse syn‐collisional granite and volcanic arc granite zones, indicating a transitional feature. Trace element relationships suggest magma fractionation dominantly controlled by plagioclase, K‐feldspar, amphibole, and biotite. Magmatic zircon grains from the CH rocks show upper intercept ages in the range of 783 to 819 Ma and lower intercept ages in the range of 519 to 545 Ma, with cumulative age peaks at 766 and 529 Ma. The combined age population of monzogabbro, granodiorite, and granite from the PT pluton shows distinct peaks at 1,021, 950, and 537 Ma. Zircon grains from the CH pluton show dominantly negative εHf (t) values in the range of −5.8 to −13.4 and yield Hf depleted model age (TDM) ranging from 1,541 to 1857 Ma and Hf crustal model ages ( ) of 2,029 to 2510 Ma. In contrast, zircon grains from the PT pluton show dominantly positive εHf (t) values (2.9 to 9.8) with depleted model ages (TDM) in the range of 1,145 to 1434 Ma and Hf crustal model ages ( ) in 1,164 to1,686 Ma. The zircon U‐Pb and Lu‐Hf data clearly indicate that the timing of magmatism and magma sources is different for the two plutons, although both witnessed a common metamorphic event during late Neoproterozoic–Cambrian. The PT pluton was emplaced during the early Neoproterozoic with magma source involving mostly juvenile or depleted mantle components, as also attested to by the geochemical signature of arc affinity. In contrast, the CH pluton formed later during mid‐Neoproterozoic with magma from deeper source and dominated by recycled Paleoproterozoic material, which possibly involved depleted mantle components, both associated with an earlier subduction regime. The results reported in our study correlate with those from the arc magmatic rocks in the southern part of the Madurai Block as well as from the crustal blocks in the adjacent terrane of Sri Lanka. The extensive Neoproterozoic arc magmatism in a subduction‐related setting involving both juvenile additions and recycled older components represents the building blocks of Gondwana.

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Neoproterozoic arc accretion along the ‘eastern suture’ in Sri Lanka during Gondwana assembly

Cited by 56 publications

References 95 publications

Internal textures and U–Pb geochronology of zircons in metamorphic rocks from the Southwestern Highland Complex, Sri Lanka

Internal textures and U–Pb geochronology of zircons in metamorphic rocks from the Southwestern Highland Complex, Sri Lanka

Late Neoproterozoic–Early Palaeozoic stratigraphic succession, Western Himalaya, North Pakistan: Detrital zircon provenance and tectonic implications

Neoproterozoic felsic magmatism in southern Kerala, India: The building blocks of Gondwana

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