Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet

Fan, Suoya; Ding, Lin; Murphy, Michael A.; Wei, Yao; Yin, An

doi:10.1016/j.tecto.2017.10.022

Cited by 38 publications

(7 citation statements)

References 87 publications

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“…However, among the Gondwana‐derived terranes or plates, the Australian Plate is not a unique source for the distinct ~1,170‐Ma detrital zircon population found in Paleozoic strata of the Lhasa Terrane, which could have also been sourced from East African orogenic belts before and during the assembly of Gondwana (e.g., Zeng et al, ; Zhang et al, ). This view is supported by a recent study revealing that Permian strata in the Lhasa Terrane contains both ~950‐ and ~1,170‐Ma detrital zircon populations (Fan et al, ).…”

Section: Discussionmentioning

confidence: 60%

“…First, the diagnostic features of the Gondwana supercontinent (i.e., glacial diamictites and cold‐ or cool‐water faunas) are present in the early Permian strata of the Lhasa, Qiangtang, and Himalayan terranes. Moreover, the stratigraphy and detrital zircon provenance of these strata are generally similar in all cases (Fan et al, ; Gehrels et al, ; Jin et al, ; Metcalfe, , , ). The presence of both cold‐ and warm‐water fauna in the Lhasa Terrane was potentially a result of climate change (e.g., Fielding et al, ; Isbell et al, ; Jin et al, ).…”

Section: Discussionmentioning

confidence: 93%

“…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%

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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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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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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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“…In a broader context, termination of the Meso‐Tethys north‐dipping subduction zone may have induced plate kinematic reorganizations and generation of ophiolites above newly initiated oceanic subduction zones to the south. This could potentially explain generation of Middle to Late Jurassic ophiolites near Baila and Xainza in the Lhasa terrane (Fan et al, 2017; Tang et al, 2018; Zhong et al, 2017) and within the Yarlung‐Tsangpo suture farther to the south (~177–150 Ma; e.g., Pedersen et al, 2001; Hébert et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Pre‐Oxfordian (>163 Ma) Ophiolite Obduction in Central Tibet

Kapp

et al. 2020

Geophysical Research Letters

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The timing of Bangong-Nujiang suture ophiolite obduction between the Lhasa and Qiangtang terranes in central Tibet is important for understanding the closure history of the Meso-Tethys but remains poorly constrained. We investigated subaerial to shallow marine strata of the Dongqiao Formation that sit unconformably on Bangong-Nujiang suture ophiolites that crystallized in a supra-subduction zone setting at 189-181 Ma. Based on foraminiferal and coral studies, the depositional age of the Dongqiao Formation is constrained to be Oxfordian and Kimmeridgian (Late Jurassic). Provenance analyses including detrital modes, geochemistry of detrital chromian spinels, and U-Pb age populations of detrital zircons suggest the Dongqiao Formation was sourced from uplifted Bangong-Nujiang suture ophiolites and sedimentary and metamorphic rocks of Lhasa terrane affinity to the south. We conclude that Bangong-Nujiang suture ophiolites were obducted soon after crystallization (prior to Oxfordian time; >163 Ma) onto the Lhasa terrane or a microcontinent of Lhasa terrane affinity.Plain Language Summary Ophiolite obduction often occurs when a passive continental margin enters an oceanic subduction zone and thus may mark when an arc-continent or continent-continent collision begins. In central Tibet, the Dongqiao ophiolite represents a relict of Meso-Tethys oceanic lithosphere. Initial research during the 1980s provided rough constraints on the timing, polarity, and mechanism of Dongqiao ophiolite obduction. However, there has been little advancement in our knowledge of the obduction history since. Here we report results of sedimentologic, stratigraphic, and provenance studies on the Dongqiao Formation overlying the Dongqiao ophiolite. Our foraminiferal and coral biostratigraphic data show that subaerial to shallow marine strata of the Dongqiao Formation were deposited between 163 and 152 million years ago. We demonstrate that the clastic rocks in the Dongqiao Formation received detritus from both the underlying Dongqiao ophiolite and Lhasa terrane affinity continental crust. We propose that a continental margin of Lhasa terrane affinity entered a north-dipping oceanic trench, and the Dongqiao ophiolite was obducted southwards on to it, no later than 163 million years ago.

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“…All the detrital zircon U–Pb age distributions of the Permian, Triassic–Jurassic, and Cretaceous sediments in the Lhasa Terrane show significant peaks at ca. 500 and 1000 Ma (Fan, Ding, Murphy, Yao, & Yin, 2017; Leier, Kapp, Gehrels, & DeCelles, 2007; Pullen et al, 2008; Wang et al, 2017). The zircon U–Pb age distribution of the Eocene conglomerates is similar to the zircon U–Pb data from the Eocene red beds of the Lhasa Terrane (Kapp, Decelles, Leier, et al, 2007; Figure 5).…”

Section: Discussionmentioning

confidence: 99%

Long‐term exhumation history of the Gangdese magmatic arc: Implications for the evolution of the Kailas Basin, western Tibet

et al. 2019

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Constraining the long-term exhumation history of the Gangdese magmatic arc is critical for understanding the coupled evolution of orogenic exhumation and accumulation of basin sediments on the southern Tibetan Plateau. We present new zircon fission-track (ZFT) data from sandstones in the Mt. Kailas area, western Tibet, to decipher the relation between source rock exhumation and sediment deposition in the basin. Two sedimentary members were recognized in the Kailas Basin which are the Eocene conglomerates in the hanging wall of the Great Counter Thrust and the Oligocene-Miocene Kailas Formation in the footwall. The Eocene conglomerates were mostly derived from the Lhasa Terrane to the north with recycling of pre-Cenozoic sediments, containing zircons that experienced post-magmatic cooling after the Indian-Asian collision and buried deeply later by the Oligocene-Miocene Kailas Formation. The ZFT analysis from the Kailas Formation illustrates significant cooling during the Oligocene (ca. 32 Ma) in the source region, indicating that the Gangdese magmatic arc rocks were eroded rapidly during that time. The alternate increasing and decreasing of the southernmost Gangdese magmatic arc progresses are linked to dynamic topography deflection induced by the northward subduction of the Indian Plate since the Oligocene and subsequent southward overturning of the Indian mantle slab. Basin subsidence and formation of the Kailas Formation seems also be driven by dynamic topography since the Oligocene.

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Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet

Cited by 38 publications

References 87 publications

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

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

Pre‐Oxfordian (>163 Ma) Ophiolite Obduction in Central Tibet

Long‐term exhumation history of the Gangdese magmatic arc: Implications for the evolution of the Kailas Basin, western Tibet

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