Provenance of Late Triassic sediments in central Lhasa terrane, Tibet and its implication

Li, Guangwei; Sandiford, Mike; Liu, Xiaohan; Xu, Zhiqin; Wei, Liqing; Li, Huaqi

doi:10.1016/j.gr.2013.06.019

Cited by 69 publications

(38 citation statements)

References 62 publications

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“…Recently, Zhu et al (2012) report that the Cambrian volcanic sequences have e Hf (t) values in the range of 213.9 and 17.5, with T C DM values ranging from 900 to 2300 Ma. PreMesozoic inherited zircons and detrital zircons from these rocks give age population peaks at 550 and 1170 Ma, show e Hf (t) values in the range of 238.1 to ∼15.6, with T C DM ages ranging from 300 to 3900 Ma (Chu et al 2006;Leier et al 2007;Ji et al 2009;Zhu et al 2011;Li et al 2014). Detrital zircon populations from the Xigaze forearc basin are characterized by a dominant age mode between 130 and 80 Ma and a subordinate one with an age range of 190-150 Ma (Wu et al 2010).…”

Section: Discussionmentioning

confidence: 97%

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Provenance of the Upper Cretaceous to Lower Tertiary Sedimentary Relicts in the Renbu Mélange Zone, within the Indus-Yarlung Suture Zone

Sandiford

Boger

et al. 2015

The Journal of Geology

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Section: Discussionmentioning

confidence: 97%

“…These rocks are locally overlain by Cenozoic sediments. The northern Lhasa terrane is comprised of mostly upper Palaeozoic-Cretaceous sediments, although it includes localized exposures of Paleozoic and Mesozoic igneous rocks (Leier et al 2007;Zhu et al 2013;Li et al 2014).…”

Section: Geologic Settingmentioning

confidence: 99%

Provenance of the Upper Cretaceous to Lower Tertiary Sedimentary Relicts in the Renbu Mélange Zone, within the Indus-Yarlung Suture Zone

Sandiford

Boger

et al. 2015

The Journal of Geology

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“…The broad peaks around 500–400 Ma and 300–200 Ma are common to Triassic strata from the Qiangtang block [ Gehrels et al , ]. Conversely, detrital zircons derived from the Lhasa block have distinctive peaks at 1250–1100 Ma and 550 Ma [ G. W. Li et al , ; Wang et al , ; Zhu et al , ], which lack in the Sewa and Gaaco formations (Figure ). These lowermost Middle Jurassic units indicate provenance from the Qiangtang block rather than from the Lhasa block.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…U‐Pb relative age–probability density diagrams for detrital zircons in strata of the southern Qiangtang basin. Data from Qiangtang Paleozoic strata (samples 05AQ07, 05AQ10, 05GT42, 05GT56, 0524022, AP0703052, 64062B, 6120611, 6120612, 061705, 06GT80, 06GT43, 06GT69, 06GT81, 06GT112, 06GT145, 06AQ187, and 06AD197 from Gehrels et al [] and Pullen et al [] and XZ0701 from Dong et al []), southern Qiangtang Upper Triassic strata (sample 14QT16 from this study; 613982, 720993, 06GT10, and 06GT23 from Gehrels et al []; and 16WQ‐A from Wang et al []), and Lhasa Upper Triassic strata (samples LZ11‐2‐5, LZ11‐2‐7, LZ11‐2‐8, LZ11‐2‐9, and LZ11‐2‐11 from G. W. Li et al [] and sample 13MLG08 from Wang et al []) are plotted for comparison.…”

Section: Provenance Analysismentioning

confidence: 91%

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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“…Rocks with these features are more likely to have been derived by partial melting of sedimentary rocks, triggered by underplated mantle‐derived rocks, and can form in various tectonic settings. Therefore, combined with the rare ~300‐ to 260‐Ma detrital zircon grains in the Permian‐Triassic sedimentary rocks of the Lhasa Terrane (Fan et al, ; Gehrels et al, ; Li et al, ), there is no solid evidence from Permian igneous rocks for a subduction‐collisional setting for the Lhasa Terrane during the middle‐late Permian.…”

Section: Discussionmentioning

confidence: 99%

Initial Rifting of the Lhasa Terrane from Gondwana: Insights From the Permian (~262 Ma) Amphibole‐Rich Lithospheric Mantle‐Derived Yawa Basanitic Intrusions in Southern Tibet

Zeng

Ducea

et al. 2019

JGR Solid Earth

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The Permian tectonic setting of the Lhasa Terrane in southern Tibet remains controversial (i.e., continental rift vs. subduction‐collision) and is crucial to palinspastic reconstructions of the eastern Tethys during the breakup of Gondwana. In this study, we present new geochronological, geochemical, and mineralogical data for the Permian (~262 Ma) Yawa intrusions in the southern Lhasa Terrane. These rocks are silica‐undersaturated and alkaline, with high TiO2 and moderate MgO, and exhibit enrichments in Th, light rare earth elements, and Nb‐Ta, and depletions in K. These chemical compositions, combined with uniform whole‐rock (87Sr/86Sr)i (0.7039–0.7044), εNd(t) (1.85–2.81), and εHf(t) (4.21–6.90) values, and zircon εHf(t) (4.53–9.97) and δ18O (5.04‰–5.76‰) values, indicate the magmas were derived by partial melting of amphibole‐rich lithospheric mantle. The magmas subsequently underwent fractionation of clinopyroxene, amphibole, and Fe‐Ti oxides. The amphibole in the lithospheric mantle likely formed as cumulates from low‐degree asthenospheric melts during incipient extension. Given that the amphibole‐rich metasomatic veins have a lower melting temperature than the surrounding peridotite, they were susceptible to melting during the early stages of thermal perturbation of the mantle. Because there is no evidence of Permian continental subsidence in the Lhasa Terrane, we suggest the Yawa intrusions were formed at the onset of lithospheric extension associated with initial rifting of the Lhasa Terrane from the Indian Plate during Gondwana breakup, which was a precursor to the opening of the Neo‐Tethys Ocean.

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Provenance of Late Triassic sediments in central Lhasa terrane, Tibet and its implication

Cited by 69 publications

References 62 publications

Provenance of the Upper Cretaceous to Lower Tertiary Sedimentary Relicts in the Renbu Mélange Zone, within the Indus-Yarlung Suture Zone

Provenance of the Upper Cretaceous to Lower Tertiary Sedimentary Relicts in the Renbu Mélange Zone, within the Indus-Yarlung Suture Zone

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

Initial Rifting of the Lhasa Terrane from Gondwana: Insights From the Permian (~262 Ma) Amphibole‐Rich Lithospheric Mantle‐Derived Yawa Basanitic Intrusions in Southern Tibet

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