Transition from oceanic subduction to continental collision recorded in the Bangong-Nujiang suture zone: Insights from Early Cretaceous magmatic rocks in the north-central Tibet

Wei, Wang; Wang, Ming; Zhai, Qingguo; Xie, Chao-Ming; Hu, Peiyuan; Cai, Li; Liu, Jin-Heng; Luo, An‐Bo

doi:10.1016/j.gr.2019.09.008

Cited by 28 publications

(10 citation statements)

References 129 publications

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“…The second view holds that the Early Cretaceous magmatism in the CLT and NLT is due to slab rollback and the following break‐off of the Bangong‐Nujiang oceanic slab (Chen et al, 2014; Huang et al, 2017; Tang et al, 2020; Wang et al, 2019; Wu, Li, Hu, & Li, 2015; Yu, Ma, Song, Tang, & Qu, 2020; Zhu et al, 2016). The third view is that the collision of the Lhasa terranes and Qiangtang terranes led to extensive magmatism of Early Cretaceous in the CLT and NLT (Cao et al, 2018, 2020; Tang et al, 2020; Wang et al, 2020). Compared with NLT and NLT, ECMRs records in SLT are much less, but there are ~137 Ma adakite‐like andesite (Zhu, Zhao, et al, 2009), 137–130 Ma bimodal volcanic rocks (Wang et al, 2016).…”

Section: Geological Settingmentioning

confidence: 99%

U–Pb zircon age and geochemistry of the Cuocun gabbro in the southern Lhasa Terrane: Implications for Early Cretaceous rollback of the Neo‐Tethyan oceanic slab

Lang

et al. 2020

Geological Journal

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The geodynamic mechanism of the Early Cretaceous magmatic rocks in the southern Lhasa Terrane remains controversial. To constrain the Early Cretaceous petrogenesis and tectonic evolution of the Neo‐Tethyan oceanic slab, we have undertaken zircon U–Pb dating, whole‐rock major and trace element analyses, and Sr–Nd–Pb–Hf isotopic studies of the Cuocun gabbro from the southern Lhasa Terrane. The zircon U–Pb dating yielded an Early Cretaceous crystallization age of 146.9 ± 0.6 Ma (MSWD = 0.77, 2σ). The Cuocun gabbro is enriched in large‐ion lithophile elements (e.g., Rb, Sr, and Ba) and depleted in high‐field‐strength elements (e.g., Nb, Ta, and Ti). The initial 87Sr/86Sr value are low (0.70361–0.70460), εNd(t) and εHf(t) values are high and positive (from +5.1 to +6.6 and from +11.0 to 17.0, respectively), and Pb isotope specific value are homogeneous (initial 206Pb/204Pb = 18.163–18.457, 207Pb/204Pb = 15.541–15.632, and 208Pb/204Pb = 38.262–38.673). The gabbro originated from the partial melting of a depleted mantle wedge that had reacted with slab‐derived fluids, and the ascending magmas underwent fractional crystallization without significant crustal contamination. Combining our data with those from previous studies of Early Cretaceous magmatism in the southern Lhasa Terrane, we suggest that the Early Cretaceous magmatic rocks (147–130 Ma) in the southern Lhasa Terrane were generated within a continental marginal arc setting related to the rollback of the northwards subducting Neo‐Tethyan oceanic slab.

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Section: Geological Settingmentioning

confidence: 99%

U–Pb zircon age and geochemistry of the Cuocun gabbro in the southern Lhasa Terrane: Implications for Early Cretaceous rollback of the Neo‐Tethyan oceanic slab

Lang

et al. 2020

Geological Journal

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“…In addition, Fan, Li, and Xie (2014) conducted a detailed petrological, geochemical, and chronological study of Zhonggang ocean island in the Gerze area and obtained a U‐Pb zircon age of 116.2 ± 4.1 Ma, which suggests that the Bangong‐Nujiang Tethyan Ocean still existed in Aptian time. Recently, studies of Early Cretaceous magmatism on both sides of the Bangong‐Nujiang suture zone have shown that these magmatic events were controlled by the subduction of the Bangong‐Nujiang Tethyan Ocean (Cao et al, 2016; Fan et al, 2015a; Hao et al, 2016b; J. X. Li et al, 2013, 2014; Liu et al, 2020; Wang et al, 2020; Wei et al, 2017; Wu et al, 2015; Xu et al, 2017). Moreover, Xu et al (2014) and Zeng et al (2018) identified ca.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, studies of Early Cretaceous magmatism on both sides of the Bangong-Nujiang suture zone have shown that these magmatic events were controlled by the subduction of the Bangong-Nujiang Tethyan Ocean (Cao et al, 2016;Fan et al, 2015a;Hao et al, 2016b;J. X. Li et al, 2013Liu et al, 2020;Wang et al, 2020;Wei et al, 2017;Wu et al, 2015;Xu et al, 2017). Moreover, Xu et al (2014) and Zeng et al (2018) identified ca.…”

Section: Early Cretaceous Evolution Of the Bangong-nujiang Tethyan Oceanmentioning

confidence: 99%

“…From the Late Jurassic to the Early Cretaceous, the Bangong‐Nujiang suture zone and its adjacent regions also contain sediments including the Shamuluo, Langshan, and Qushenla Formations, as well as numerous magmatic rocks (e.g., Cao et al, 2016; Chen et al, 2014; Fan et al, 2015a; Hao et al, 2016a, 2018; Hu et al, 2017; Kapp et al, 2007; S. M. Li et al, 2014; J. X. Li et al, 2013; Wang et al, 2020; Wu et al, 2016, 2019). However, due to the uncertainty in the closing time of the Bangong‐Nujiang Tethyan Ocean, there are different views on the genetic mechanism of these Late Jurassic–Early Cretaceous magmatic rocks, such as oceanic slab subduction (Fan et al, 2015a; Kang et al, 2009; J. X. Li et al, 2013, 2014), continental collision (e.g., Allègre et al, 1984; Dewey et al, 1988; Xu et al, 1985), and slab breakoff (Chang et al, 2011; Chen et al, 2014; Qu et al, 2012; Zhu et al, 2009).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Aptian Flysch in Central Tibet: Constraints on the Timing of Closure of the Bangong‐Nujiang Tethyan Ocean

et al. 2020

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The timing of the closure of the Bangong-Nujiang Tethyan Ocean is highly controversial. An important reason for this is that the sedimentological work within the Bangong-Nujiang suture zone is not sufficient. In this study, based on the U-Pb zircon dating of turbiditic sandstone and tuff interlayers, we determine the existence of Aptian flysch (ca. 126-113 Ma) in the middle and western segments of the Bangong-Nujiang suture zone. Further analysis shows that the Aptian flysch was deposited in a trench environment. In space, from the Mabujia Co area in the western segment to the Kama area in the middle segment, the outcrop extent of the Aptian flysch spans nearly 300 km from east to west. These results indicate that the Bangong-Nujiang Tethyan Ocean had not fully closed by the end of Aptian time, and its oceanic slab was still subducting. Based on this new discovery, and the results of previous studies, we believe that the middle and western segments of the Bangong-Nujiang Tethyan Ocean closed between 113 and ca. 92 Ma nonmarine deposition of the Jingzhushan Formation, which lies in angular unconformity above the flysch.

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“…Mesozoic magmatic rocks on both sides of the suture are related to the subduction of the Bangong Co-Nujiang oceanic lithosphere and the collision between the Qiangtang and Lhasa blocks (Chen et al, 2018;Hu et al, 2019;Li et al, 2019;Liu et al, 2018, b;Shi et al, 2020;Wang et al, 2020;Zhang et al, 2008Zhang et al, , 2012Zhang, Li, Yang, et al, 2017;Zhang & Tang, 2009;Zhu et al, 2016). Previous studies of the Mesozoic magmatic rocks on the northern side of the suture zone have suggested different scenarios for their formation.…”

Section: Introductionmentioning

confidence: 99%

Zircon U–Pb ages, geochemistry, and Sr–Nd–Pb–Hf isotopes of the Mugagangri monzogranite in the southern Qiangtang of Tibet, western China: Implications for the evolution of the Bangong Co‐Nujiang Meso‐Tethyan Ocean

et al. 2021

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We present in‐situ zircon laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) U–Pb ages, whole‐rock geochemistry, and Sr–Nd–Pb–Hf isotopes of the Mugagangri monzogranite in the southern margin of the Qiangtang Block, Tibet, western China. The zircons yield a U–Pb age of ca. 123 Ma. The hornblende‐bearing monzogranite shows metaluminous to weak peraluminous and high‐K calc‐alkaline characteristics exemplified by high silica (SiO2 = 67.57–70.57 wt%), high aluminium (Al2O3 = 14.68–15.78 wt%), high potassium (K2O = 4.00–5.14 wt%), high alkali (K2O + Na2O = 7.88–8.62 wt%), and low calcium contents (CaO = 1.72–2.17 wt%), with the aluminium saturation index (A/CNK) ranging from 0.98 to 1.09, suggesting that the Mugagangri monzogranite is a metaluminous to weak peraluminous I‐type high‐K calc‐alkaline granite. Geochemically, similar to the arc magmas, the monzogranite is enriched in large‐ion lithophile elements, and relatively depleted in high‐field‐strength elements. The monzogranite displays relatively high (87Sr/86Sr)i values (0.70972–0.71240), uniform εNd(t) values (−2.24 to −3.40), variable zircon εHf(t) values (−14.1 to +8.0), and high radiogenic Pb isotopic values (206Pb/204Pb = 18.588–18.790, 207Pb/204Pb = 15.616–15.642, and 208Pb/204Pb = 38.838–39.053). These geochemical characteristics indicate that the monzogranite was derived from a mixed source comprising ancient crustal and mantle materials, and experienced fractional crystallization during emplacement. We propose that the parental magma of the Mugagangri monzogranite was most likely generated during northward subduction of the Bangong Co‐Nujiang Meso‐Tethys Ocean.

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Transition from oceanic subduction to continental collision recorded in the Bangong-Nujiang suture zone: Insights from Early Cretaceous magmatic rocks in the north-central Tibet

Cited by 28 publications

References 129 publications

U–Pb zircon age and geochemistry of the Cuocun gabbro in the southern Lhasa Terrane: Implications for Early Cretaceous rollback of the Neo‐Tethyan oceanic slab

U–Pb zircon age and geochemistry of the Cuocun gabbro in the southern Lhasa Terrane: Implications for Early Cretaceous rollback of the Neo‐Tethyan oceanic slab

Aptian Flysch in Central Tibet: Constraints on the Timing of Closure of the Bangong‐Nujiang Tethyan Ocean

Zircon U–Pb ages, geochemistry, and Sr–Nd–Pb–Hf isotopes of the Mugagangri monzogranite in the southern Qiangtang of Tibet, western China: Implications for the evolution of the Bangong Co‐Nujiang Meso‐Tethyan Ocean

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