SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqêntanglha Group in Tibet

Hu, Daogong; Wu, Zhenhan; Wan, Jiafu; Shi, Yuruo; Ye, Peisheng; Liu, Qisheng

doi:10.1360/04yd0183

Cited by 79 publications

(27 citation statements)

References 20 publications

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“…Our results, together with the preliminary studies (Wang et al, 2003;Wu et al, 2003;Hu et al, 2005;Zhang et al, 2010c), provide new insights into the origin of the Lhasa terrane and the Precambrian tectonic evolution of the region in relation to the history of the Rodinia and Gondwana supercontinents.…”

Section: Introductionsupporting

confidence: 65%

Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Dong

Zhang

Santosh

et al. 2011

Journal of Geodynamics

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Section: Introductionsupporting

confidence: 65%

Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Dong

Zhang

Santosh

et al. 2011

Journal of Geodynamics

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“…The zircon U-Pb age of 787 ± 9 Ma from the oldest metamorphic rocks indicates a Neoproterozoic crystalline basement exists in the Lhasa block (Hu et al 2005). The Paleozoic sedimentary strata in the Lhasa block are rare and primarily consist of Carboniferous clastic rocks and Ordovician, Silurian, and Permian limestone.…”

Section: Regional Tectonic Settingmentioning

confidence: 99%

Mesozoic and Cenozoic Cooling History of the Qiangtang Block, Northern Tibet, China: New Constraints from Apatite and Zircon Fission Track Data

Song¹,

Wang²,

Fu³

et al. 2013

Terr. Atmos. Ocean. Sci.

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This study used a new set of zircon and apatite fission track ages to quantitatively document the tectonic evolution and cooling histories of the Qiangtang block of the central Tibetan Plateau. The results indicate that the Qiangtang block underwent three cooling stages at ~148 -73, ~50 -20, and ~20 -0 Ma. The three-stage cooling history and tectonic exhumation were controlled by the closure of the Bangong-Nujiang Suture during the Late Jurassic-Late Cretaceous, the India-Asia collision in the Paleogene, and the underthrusting of the India Plate during the Late Cenozoic. In addition to revealing the Late JurassicLate Cretaceous cooling events, the annealing patterns of the zircon fission track samples indicate different burial depths, which may help identify the Jurassic basin characteristics of the Qiangtang block. The apatite fission track (AFT) ages range from 60 ± 5 Ma to 26 ± 3 Ma, with a mean age of 44 Ma. These ages indicate that the Cenozoic exhumation of the Qiangtang block may have started in the Eocene. Inverse modeling of the AFT data shows that the Qiangtang block had a relatively slow cooling rate of approximately 0.5 -1°C Myr -1 from 50 to 20 Ma. After ~20 Ma, most of the samples show evidence for a rapid cooling stage with a cooling rate of 4 -6°C Myr -1 .

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“…The central Lhasa terrane comprises Precambrian basement (e.g. the Nyainqentanglha gneisses), overlain by PaleozoicCretaceous sedimentary cover (Hu et al, 2005;Zhu et al, 2011). The southern Lhasa terrane is dominated by Cretaceous-Early Tertiary Gangdese batholiths and the Linzizong volcanic succession (Chu et al, 2006;Coulon et al, 1986;Ji et al, 2009;Lee et al, 2009;Wen et al, 2008b;Zhang et al, 2007).…”

Section: Geological Backgroundmentioning

confidence: 99%

Late Cretaceous (~81Ma) high-temperature metamorphism in the southeastern Lhasa terrane: Implication for the Neo-Tethys ocean ridge subduction

et al. 2013

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An integrated study of U\Pb zircon dating, geochemical and Sr\Nd\Hf isotopic compositions of garnet-bearing granulite and marble from the granulite-facies domain of the Nyingchi Complex (eastern Himalayan syntaxis) has provided insights into the tectonic evolution of the southern Lhasa terrane. The peak metamorphism of the garnet-bearing granulite is marked by a mineral assemblage of garnet + orthopyroxene + high-Ti amphibole + plagioclase + quartz + rutile. Abundant exsolved rutile needles are observed within amphibole, garnet and quartz. The peak metamorphic temperatures are estimated at 803-924°C. Geochemical data from the garnet-bearing granulites provide evidence for a basaltic protolith that formed in a continental-margin arc setting. Sr\Nd\Hf isotopic compositions indicate that this protolith was sourced from partial melting of a depleted mantle. LA-ICP MS U\Pb zircon dating shows that the protolith age and metamorphic age of the garnet-bearing granulites are 89.3 ± 0.6 Ma and 81.1 ± 0.8 Ma, respectively. The detrital magmatic zircons from the marble yield ages from 86.3 to 167 Ma. The age distribution and Hf isotopic composition (ε Hf (t) = +5.9 to +17.5) of the detrital magmatic zircon in the marble are consistent with the isotopic data of zircons from the Jurassic-Cretaceous Gangdese batholiths, suggesting that the clastic sediments were partially derived from these intrusives or associated volcanic rocks, and deposited in the fore-arc basin of the Gangdese arc. The metamorphic zircons in the marble yield a metamorphic age of 81.4 ± 0.5 Ma. These results show that both the arc magmatic rocks and forearc sedimentary rocks underwent high-temperature (HT) granulite-facies metamorphism at~81 Ma, indicating anomalously high heat input in the forearc region. A range of tectonic observations, including a coeval hiatus in arc magmatism and a period of regional uplift, indicate that HT metamorphism resulted from the subduction of the Neo-Tethys ocean ridge beneath the southern Lhasa terrane during the Late Cretaceous.

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SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqêntanglha Group in Tibet

Cited by 79 publications

References 20 publications

Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Mesozoic and Cenozoic Cooling History of the Qiangtang Block, Northern Tibet, China: New Constraints from Apatite and Zircon Fission Track Data

Late Cretaceous (~81Ma) high-temperature metamorphism in the southeastern Lhasa terrane: Implication for the Neo-Tethys ocean ridge subduction

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