Detrital zircon U–Pb age and Hf isotopic composition from foreland sediments of the Assam Basin, NE India: Constraints on sediment provenance and tectonics of the Eastern Himalaya

Vadlamani, Ravikant; Wu, Fu‐Yuan; Ji, Wei‐Qiang

doi:10.1016/j.jseaes.2015.07.011

Cited by 38 publications

(33 citation statements)

References 67 publications

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“…Vadlamani et al () researched the provenance of Tertiary sedimentary rocks in the Assam Basin, to the northeast of the Bengal Basin. In their oldest sample from the early to middle Eocene Sylhet Formation, the detrital zircon age spectrum is similar to ours with peaks of ~500 Ma, 950–1150 Ma and ~2400–2550 Ma.…”

Section: Provenance Interpretationmentioning

confidence: 99%

“…Najman et al () reported the first detrital zircon U–Pb ages of Palaeogene sediments in the Bengal Basin and suggested that the first influx of detritus was from the Himalaya at 38 Ma, which corresponds to the base of the Barail Formation. Further studies of the Bengal Basin and adjacent region sediments (Bracciali et al, ; Cina et al, ; Vadlamani et al, ) led to controversial conclusions about the first arrival of detritus eroded from the Himalaya and Trans‐Himalaya into the foreland. For example, Vadlamani et al () suggested that the detrital zircon U–Pb age peaks at ~500 Ma, 950–1150 Ma and ~2400–2550 Ma in the Sylhet Formation sandstone matched the three age peaks of the Tethyan Himalayan Sequence.…”

Section: Introductionmentioning

confidence: 99%

“…Further studies of the Bengal Basin and adjacent region sediments (Bracciali et al, ; Cina et al, ; Vadlamani et al, ) led to controversial conclusions about the first arrival of detritus eroded from the Himalaya and Trans‐Himalaya into the foreland. For example, Vadlamani et al () suggested that the detrital zircon U–Pb age peaks at ~500 Ma, 950–1150 Ma and ~2400–2550 Ma in the Sylhet Formation sandstone matched the three age peaks of the Tethyan Himalayan Sequence. This implies that the Himalayan sediments arrived in this region at ~50 Ma, earlier than at 38 Ma as suggested by Najman et al ().…”

Section: Introductionmentioning

confidence: 99%

“…This implies that the Himalayan sediments arrived in this region at ~50 Ma, earlier than at 38 Ma as suggested by Najman et al (). Based on a detrital zircon grains dated at 85 Ma with a ε (Hf) = +8.5 that matches the signature of Gangdese batholith zircons, Vadlamani et al () proposed that the Gangdese batholith detritus was firstly deposited in this region at 40 Ma. To the north of the Bengal Basin, Cina et al () analysed Neogene sediments in the Arunachal Himalaya and suggested that the deposition of Gangdese batholith detritus took place through the Late Miocene and Pliocene (~10–3 Ma), which is far later than that of Vadlamani et al ().…”

Section: Introductionmentioning

confidence: 99%

“…Based on a detrital zircon grains dated at 85 Ma with a ε (Hf) = +8.5 that matches the signature of Gangdese batholith zircons, Vadlamani et al () proposed that the Gangdese batholith detritus was firstly deposited in this region at 40 Ma. To the north of the Bengal Basin, Cina et al () analysed Neogene sediments in the Arunachal Himalaya and suggested that the deposition of Gangdese batholith detritus took place through the Late Miocene and Pliocene (~10–3 Ma), which is far later than that of Vadlamani et al (). With a different opinion, Bracciali et al () reported detrital zircon U–Pb ages and Hf isotope data of Oligocene‐Pliocene successions and suggested the Gangdese detritus arrived in the Bengal Basin in the Early Miocene (approximately 23–16 Ma) as a result of the paleo‐Brahmaputra river capturing the Yarlung Tsangpo River.…”

Section: Introductionmentioning

confidence: 99%

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Provenance of the Cenozoic Bengal Basin sediments: Insights from U–Pb ages and Hf isotopes of detrital zircons

et al. 2018

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The Bengal Basin is located in the foreland of the eastern Himalaya and records late Palaeocene to Pleistocene sedimentation. This makes the Bengal Basin an ideal place to study the evolution of the eastern Himalaya by provenance researches. Even though there have been several studies about its provenance, a consensus has not been reached about when the Himalayan and Gangdese‐derived detritus started to deposit in the eastern Himalayan foreland. Here, we study the provenance of Eocene to Pleistocene sedimentary successions of the Bengal Basin by detrital zircon U–Pb geochronology and Hf isotope analyses. Detrital zircon U–Pb age spectra show a predominant peak of ~470–580 Ma in all the samples. A peak at this time is prominent in sediments of the Tethyan Himalaya and Lesser Himalaya, which means the detritus eroded from Himalaya may have been deposited in the Bengal Basin after the late Palaeocene‐early Eocene, synchronous with detritus derived from the western and central Himalaya. Gangdese‐derived zircons were firstly recorded in the late Eocene Kopili Formation, and they were sporadic from the late Eocene to middle Miocene, which was probably due to the long distance between the Bengal Basin and the Lhasa Block, to the forebulge in the Lesser Himalayan Sequence, or to a wide tectonic separation at that time. The first influx of abundant Gangdese‐derived zircons occurred in the lower part of the Boka Bil Formation in the late Miocene (~10 Ma), which was probably caused either by the Brahmaputra River capturing the Yarlung Tsangpo River or by a much later terminal collision between India and Eurasia, or both.

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Section: Provenance Interpretationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Provenance of the Cenozoic Bengal Basin sediments: Insights from U–Pb ages and Hf isotopes of detrital zircons

et al. 2018

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Geochemistry of Eocene to Pliocene strata of the Bengal Basin: Implications for provenance and erosion of the Himalaya

et al. 2020

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The earliest record of Himalayan detritus in the Himalayan foreland and the erosion sequence of different lithotectonic units of the Himalaya are critical for reconstructing collision and crustal deformation of the orogenic belt. In this study, bulk-rock major, trace and rare earth elements of 19 fine-grained clastic sedimentary rock samples from Eocene to Pliocene strata of the Bengal Basin were examined to study their provenance and erosion of the Himalaya. Combining with previous detrital zircon age data from the Bengal Basin, Nepal foreland basin, and South Tibet, we suggest that detritus from the uplifted Tethyan Himalayan Sequences and the Gangdese Arc had not been carried into the Himalayan foreland at least before Late Miocene, and that the Bengal Basin was in a passive continental margin setting from Eocene to Early Miocene, receiving detritus from a felsic sedimentary rock source.The earliest Himalayan detritus recorded in the Eocene strata of Bengal Basin were probably derived from the antecedent sedimentary cover of the Greater Himalayan crystalline rocks. We assume that the lack of Cretaceous Gangdese detritus in the Himalayan foreland from Eocene to Middle Miocene is due to a geomorphic barrier between the Tethyan Himalaya and the Himalayan foreland. Detritus from the Greater Himalayan crystalline rocks were first recorded in the Middle-Late Miocene Boka Bil Formation of the Bengal Basin, which is consistent with the uplift and exhumation time of the Greater Himalayan Sequences.

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Zircon U–Pb ages of Lohit Plutonic Complex, NE India: Constraints on episodic magmatism of eastern Trans‐Himalaya

et al. 2021

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The Lohit Plutonic Complex (LPC) represents Trans-Himalayan magmatic rocks in the easternmost sector of the Himalayan Orogen. It is divided into leucogranite-granodiorite-diorite dominant suite in the NE and the gabbro-diorite-granodiorite-granite-trondhjemite suite in the SE by the Walong Thrust. U-Pb geochronological analyses of euhedral zircon grains from different magmatic phases of LPC reveal episodic magmatism. Zircon U-Pb age of 153.4 ± 1.4 Ma of a garnetiferous granite gneiss suggest that the crustal sourced magmatism was active in Arunachal Trans-Himalaya during the late Jurassic. U-Pb ages of subduction induced magmatic rocks of LPC range between 117 ± 0.6 Ma and 49.5 ± 0.3 Ma. A significant contribution in crustal recycling during the Oligocene-Miocene is evident from crustally derived leucogranites having U-Pb ages ranging from 35.6 ± 0.3 Ma to 30 ± 0.3 Ma. A comparison of the crystallization ages of the Western Trans-Himalayan units with those of eastern Trans-Himalayan units reveals an earlier onset of Tethyan arc magmatism in the eastern sector. The most prominent phase in the eastern sector is during the Late Cretaceous while western and central sector show major activity during the Palaeocene-Eocene.

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Detrital zircon U–Pb age and Hf isotopic composition from foreland sediments of the Assam Basin, NE India: Constraints on sediment provenance and tectonics of the Eastern Himalaya

Cited by 38 publications

References 67 publications

Provenance of the Cenozoic Bengal Basin sediments: Insights from U–Pb ages and Hf isotopes of detrital zircons

Provenance of the Cenozoic Bengal Basin sediments: Insights from U–Pb ages and Hf isotopes of detrital zircons

Geochemistry of Eocene to Pliocene strata of the Bengal Basin: Implications for provenance and erosion of the Himalaya

Zircon U–Pb ages of Lohit Plutonic Complex, NE India: Constraints on episodic magmatism of eastern Trans‐Himalaya

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