Late Jurassic adakitic granodiorite in the Dong Co area, northern Tibet: Implications for subduction of the Bangong–Nujiang oceanic lithosphere and related accretion of the Southern Qiangtang terrane

Fan, Jian‐Jun; Cai, Li; Wu, Hao; TianYu, Zhang; Wang, Ming; Jingwen, Chen; Xu, Jinhui

doi:10.1016/j.tecto.2016.10.026

Cited by 41 publications

(22 citation statements)

References 94 publications

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“…The BNSZ represents the closure of the Meso‐Tethyan seaway along the southern margin of the Qiangtang terrane during Late Jurassic to Late Cretaceous times, resulting in amalgamation of the Lhasa and Qiangtang terranes (Figure a; Chen, Fan, Shi, Gong, & Wu, ; Fan, Li, Liu, & Xu, ; Fan et al, ; Huang et al, ; Kapp, Decelles, Gehrels, Heizler, & Ding, ; Li, Qin et al, ; Li et al, ; Liu et al, ; Yan et al, ; Yin & Harrison, ; Zhu et al, ). Ophiolite fragments and Mesozoic clastic units (Li, Ding et al, ) within the BNSZ are tectonically superimposed.…”

Section: Geologic Backgroundmentioning

confidence: 99%

Subsidence and exhumation of the Mesozoic Qiangtang Basin: Implications for the growth of the Tibetan plateau

Zhang

Sinclair

et al. 2019

Basin Research

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The subsidence and exhumation histories of the Qiangtang Basin and their contributions to the early evolution of the Tibetan plateau are vigorously debated. This paper reconstructs the subsidence history of the Mesozoic Qiangtang Basin with 11 selected composite stratigraphic sections and constrains the first stage of cooling using apatite fission track data. Facies analysis, biostratigraphy, palaeo-environment interpretation and palaeo-water depth estimation are integrated to create 11 composite sections through the basin. Backstripped subsidence calculations combined with previous work on sediment provenance and timing of deformation show that the evolution of the

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Section: Geologic Backgroundmentioning

confidence: 99%

Subsidence and exhumation of the Mesozoic Qiangtang Basin: Implications for the growth of the Tibetan plateau

Zhang

Sinclair

et al. 2019

Basin Research

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“…Fan et al, ) and granodiorite with U–Pb ages of 160–155 Ma (J. J. Fan et al, ), which can be related to a subduction of the BNO. The collisional volcanic rocks with the U–Pb ages of 113–109 Ma and unconformity that underlines the late Early Cretaceous Qushenla Formation (Qu, Xin, Du, & Chen, ) infer that the BNO should have been closed at the late Early Cretaceous.…”

Section: Ophiolite Belt and Granite Belt Along The Bnszmentioning

confidence: 99%

Collisional processes between the Qiangtang Block and the Lhasa Block: Insights from structural analysis of the Bangong–Nujiang Suture Zone, central Tibet

Guo

et al. 2019

Geological Journal

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The Bangong–Nujiang Suture Zone (BNSZ) is one of the main suture zones in the Tibetan Plateau and indicates the existence of the Bangong–Nujiang Neo‐Tethys Ocean (BNO). It was formed by the collision between the Qiangtang and Lhasa blocks after the closure of the BNO. However, its evolutionary processes and subduction polarity remain controversial. Research on the BNSZ is of great significance for exploring plate tectonic evolution and ocean–continent connection. The scarcity of the BNSZ structural data is one of the most important reasons for the debate of the BNO tectonic evolution. Based on structural analysis in the field and combined with previous petrology and palaeomagnetic data, this paper has determined that the closure time of the BNO is progressive and scissor‐like, from Middle Jurassic in the east to Early Cretaceous in the middle and late Early Cretaceous to early Late Cretaceous in the west. There was a three‐stage deformation in the BNSZ: (a) N–S‐directed compression induced by the initial collision; (b) WNW–directed transpression related to the stress adjustment; and (c) NE–SW‐directed compression caused by the low‐angle NE‐directed subduction of the Indus–Yarlung Zangbo Ocean. The different structural pattern along the eastern segment of the BNSZ may have resulted from orogenic bending due to the later Himalayan Orocline caused by the India–Eurasia collision in the Cenozoic.

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“…Previous studies have indicated that the extensive Late Jurassic plutonic suites in central Tibet are compositionally diverse and include normal I-type granites (J.X. Liu et al, 2014;Wu et al, 2016), highly fractionated I-type granites Liu et al, 2014), K-rich adakitic rocks (Hao et al, 2016;Wu et al, 2016), Na-rich adakitic rocks (Fan et al, 2016;Y.L. Li et al, 2016;S.M.…”

Section: Comparison With Coeval Granitic Rocks In Central Tibetmentioning

confidence: 99%

“…Hao et al, 2016;Wu et al, 2016). Na-rich adakitic rocks are considered to be derived from subducted oceanic crust (Fan et al, 2016;Y.L. Li et al, 2016;S.M.…”

Section: Comparison With Coeval Granitic Rocks In Central Tibetmentioning

confidence: 99%

“…The Labuco plagiogranites are characterized by high Al 2 O 3 and Sr contents, high Sr/Y and (La/Yb) N ratios, positive Eu anomalies, and depletion in HREEs, and they demonstrate a geochemical affinity with typical adakites or high-Al tonalite-trondhjemite-granodiorites (TTGs; Defant and Drummond, 1990;Condie, 2005;Martin et al, 2005;Castillo, 2012). An oceanic subduction setting, combined with the existence of coeval slabderived adakitic rocks in the adjacent Kangqiong and Dongco areas (Fan et al, 2016;Y.L. Li et al, 2016), indicates that the partial melting of a subducted slab (eclogite) is the likely explanation for the generation of Labuco high-Al plagiogranites.…”

Section: Petrogenesismentioning

confidence: 99%

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Age, origin, and geodynamic significance of high-Al plagiogranites in the Labuco area of central Tibet

et al. 2018

Lithosphere

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Late Jurassic plutonic suites with diverse geochemical compositions are widespread in central Tibet, recording the evolution of the Bangong-Nujiang Tethyan Ocean. This paper presents new zircon U-Pb ages, whole-rock major-and trace-element compositions, and zircon Hf isotopic data for the intrusive plagiogranite body formed within the Labuco ophiolite complex of the Bangong-Nujiang suture zone. The Labuco plagiogranites yield a laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon age of ca. 167 Ma, indicating a Late Jurassic age of crystallization. They are characterized by high Al 2 O 3 and Na 2 O, and low K 2 O, TiO 2 , and MgO contents, with positive zircon ε Hf (t) values similar to those of high-Al plagiogranites. These features lead us to propose that partial melting of arc-type basalts at the base of the accretionary complex (at depths of >40 km) could be another petrogenetic explanation for the high-Al plagiogranites within the ophiolite complex. This study and earlier publications indicate that the Late Jurassic plutonic suites are characterized by diverse geochemical compositions and were formed in a subduction setting controlled by northward subduction of Bangong-Nujiang Tethyan oceanic lithosphere. Magmatic underplating, triggered by this subduction, played a key role in the vertical crustal growth in central Tibet.

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Late Jurassic adakitic granodiorite in the Dong Co area, northern Tibet: Implications for subduction of the Bangong–Nujiang oceanic lithosphere and related accretion of the Southern Qiangtang terrane

Cited by 41 publications

References 94 publications

Subsidence and exhumation of the Mesozoic Qiangtang Basin: Implications for the growth of the Tibetan plateau

Subsidence and exhumation of the Mesozoic Qiangtang Basin: Implications for the growth of the Tibetan plateau

Collisional processes between the Qiangtang Block and the Lhasa Block: Insights from structural analysis of the Bangong–Nujiang Suture Zone, central Tibet

Age, origin, and geodynamic significance of high-Al plagiogranites in the Labuco area of central Tibet

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