Cretaceous volcanic rocks in south Qiangtang Terrane: Products of northward subduction of the Bangong–Nujiang Ocean?

Li, Yalin; He, Jun; Wang, Chengshan; Han, Zehua; Ma, Pengfei; Xu, Minggang; Du, Kun

doi:10.1016/j.jseaes.2014.09.033

Cited by 65 publications

(38 citation statements)

References 70 publications

(119 reference statements)

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“…Based on the age of underlying and overlying strata, the Biluoco Formation is between the late Bathonian (168–166 Ma) and early Callovian (166–164 Ma) in age. The conformably overlying Suowa Formation mainly consists of limestone containing bivalves and ammonites, suggesting a Callovian (166–164 Ma) age [ Yao et al , ; Yin , ]. The Abushan Formation [ Wu et al , ], mainly consisting of conglomerates and sandstones and yielding Late Cretaceous pollens [ Wu et al , ], overlies Jurassic strata unconformably. Interbedded volcanic lavas were dated as 80–76 Ma [ Y. L. Li et al , ], 103–96 Ma [ Y. L. Li et al , ], and 83 Ma [ Wu et al , ], confirming the Late Cretaceous age.…”

Section: Geological Settingsupporting

confidence: 88%

Sedimentary and tectonic evolution of the southern Qiangtang basin: Implications for the Lhasa‐Qiangtang collision timing

et al. 2017

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The Mesozoic stratigraphic record of the southern Qiangtang basin in central Tibet records the evolution and closure of the Bangong‐Nujiang ocean to the south. The Jurassic succession includes Toarcian‐Aalenian shallow‐marine limestones (Quse Formation), Aalenian‐Bajocian feldspatho‐litho‐quartzose to feldspatho‐quartzo‐lithic sandstones (shallow‐marine Sewa Formation and deep‐sea Gaaco Formation), and Bathonian outer platform to shoal limestones (Buqu Formation). This succession is truncated by an angular unconformity, overlain by upper Bathonian to lower Callovian fan‐delta conglomerates and litho‐quartzose to quartzo‐lithic sandstones (Biluoco Formation) and Callovian shoal to outer platform limestones (Suowa Formation). Sandstone petrography coupled with detrital‐zircon U‐Pb and Hf isotope analysis indicate that the Sewa and Gaaco formations contain intermediate to felsic volcanic detritus and youngest detrital zircons (183–170 Ma) with εHf(t) ranging widely from +13 to −25, pointing to continental‐arc provenance from igneous rocks with mixed mantle and continental‐crust contributions. An arc‐trench system thus developed toward the end of the Early Jurassic, with the southern Qiangtang basin representing the fore‐arc basin. Above the angular unconformity, the Biluoco Formation documents a change to dominant sedimentary detritus including old detrital zircons (mainly >500 Ma ages in the lower part of the unit) with age spectra similar to those from Paleozoic strata in the central Qiangtang area. A major tectonic event with intense folding and thrusting thus took place in late Bathonian time (166 ± 1 Ma), when the Qiangtang block collided with another microcontinental block possibly the Lhasa block.

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Section: Geological Settingsupporting

confidence: 88%

Sedimentary and tectonic evolution of the southern Qiangtang basin: Implications for the Lhasa‐Qiangtang collision timing

et al. 2017

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“…By the Middle‐Late Cretaceous, the overlap of palaeolatitude suggests the Meso‐Tethys Ocean closed and Lhasa–Qiangtang continental collision might have finally terminated. Several lines of evidence support this scenario: (a) The newest discovery of 132–108 Ma‐aged ophiolites in central Tibet, containing rich Middle Cretaceous radiolarians (Zhang et al, ); (b) the widespread occurrence of late Early Cretaceous ocean‐island basalt overlain by the chert‐limestone oceanic crust along the Bangong‐Nujiang suture zone (Zhang et al, ; Zhu et al, ); (c) volcanic arc system was still active during the Early to Middle Cretaceous (Li, He et al, ; Zhang et al, ); and (d) the youngest marine sedimentary rocks (Langshan Formation) were transposed and unconformably overlain by the 110–106 Ma volcanic‐bearing nonmarine strata in the Nima Basin of the northern Lhasa terrane (Kapp et al, ). The Qiangtang and northern Lhasa terranes underwent an extensive marine regression in the late stage of Early Cretaceous time (Zhang et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…fossil, and palynofossil were found in our sampled section by previous work (Cheng & Xu, 1986;Wu, Barosh, Ye, & Hu, 2015;XZBGM, 1993;Zhao et al, 2001). (Figure 1b), which are regionally correlated as the same section as we sampled (Li, He, et al, 2015a;Wu et al, 2014).…”

Section: Analysis Of the Multicomponent Magnetizations Of Redbeds Inmentioning

confidence: 99%

Palaeomagnetism and detrital zircon U–Pb geochronology of Cretaceous redbeds from central Tibet and tectonic implications

et al. 2017

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Understanding the magnitude of intra‐Asian crustal shortening and the collision age of Lhasa–Qiangtang terranes requires quantitative constraints on the crustal motion. The key to this is defining the palaeogeography of the Tibetan Plateau, which constitutes a poorly known factor over the entire convergence history. New detrital zircon U–Pb geochronological and palaeomagnetic data from the terrestrial Abushan Formation in the Qiangtang terrane demonstrate that central Tibet was located at 27.5 ± 3.0°N during the time interval of ~111–83 Ma. Our results suggest 7.5 ± 2.9° continental shortening has occurred between central Qiangtang and Mongolia during the India–Asia convergence. Declination anomaly indicates the central Qiangtang terrane has experienced significant clockwise rotation (57.3 ± 3.9°) relative to stable Eurasia. The compilation of palaeomagnetic results since the Cretaceous reveals ~8.5° northward drift of the Lhasa terrane from 123 ± 9 to 97 ± 7 Ma and the palaeolatitudinal overlap between the Lhasa and Qiangtang terranes after ~111–103 Ma. Together with the onset age of the terrestrial Abushan Formation, our results provide the youngest timing (ca. ~111–103 Ma) for the closure of the Bangong Meso‐Tethys Ocean, as well as for the final collision of the Lhasa and Qiangtang terranes.

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“…In the latest Jurassic–Early Cretaceous, the basement and granite lithologies, which are unconformably overlain by 96–102 Ma sediments and volcanics (Li et al., ; Wu et al., ), were exhumed from ≥10 km depth over a 30–55 Myr period. This gives an exhumation rate of 0.2–0.3 mm/a (Figure ), consistent with exhumation rates of 0.1–0.3 mm/a estimated from fission‐track ages for the SQT (Lu et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…The timing of ocean closure and its impact on early crustal thickening in the SQT are currently explained by two competing models (Figure ). One model for closure of the Bangong Ocean suggests north‐directed subduction (Figure e) (Guynn et al., ; Hao et al., ; Huang, Xu, Chen, Wu, & Zeng, ; Kapp, DeCelles, Gehrels, Heizler, & Ding, ; Kapp et al., ; Li et al., ; Zhang et al., ). Kapp et al.…”

Section: Introductionmentioning

confidence: 99%

Early Cretaceous exhumation of the Qiangtang Terrane during collision with the Lhasa Terrane, Central Tibet

et al. 2017

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The timing of the closure of the Bangong Ocean between the Lhasa and South Qiangtang Terranes in central Tibet and the resulting crustal thickening are still under debate. We integrate published apatite fission track and (U–Th)/He thermochronometer data with new zircon (U–Th)/He ages from eight samples and with structural profiles to document that the South Qiangtang Terrane experienced slow exhumation between 200 and 150 Ma, associated with the opening of the Bangong Ocean. Accelerated exhumation (around 0.2–0.3 mm/a) of the South Qiangtang Terrane was initiated at around 150 Ma. This exhumation event is interpreted to reflect collision between the Lhasa and South Qiangtang Terranes after closure of the Bangong Ocean, associated with crustal thickening via thick‐skinned folding and thrusting within the South Qiangtang Terrane. The amalgamation of the Lhasa and South Qiangtang Terranes recorded here may represent the first stage of crustal thickening in the central Tibetan Plateau.

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Cretaceous volcanic rocks in south Qiangtang Terrane: Products of northward subduction of the Bangong–Nujiang Ocean?

Cited by 65 publications

References 70 publications

Sedimentary and tectonic evolution of the southern Qiangtang basin: Implications for the Lhasa‐Qiangtang collision timing

Sedimentary and tectonic evolution of the southern Qiangtang basin: Implications for the Lhasa‐Qiangtang collision timing

Palaeomagnetism and detrital zircon U–Pb geochronology of Cretaceous redbeds from central Tibet and tectonic implications

Early Cretaceous exhumation of the Qiangtang Terrane during collision with the Lhasa Terrane, Central Tibet

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