Geodynamic transition from subduction to extension: evidence from the geochronology and geochemistry of granitoids in the Sangsang area, southern Lhasa Terrane, Tibet

Huang, Feng; Li, Mingjian; Xu, Ji‐Feng; Zeng, Yunbo; Chen, Jianlin; Wang, Baodi; Yu, Hua-Zhong; Chen, Ling; Zhao, Peipei; Zhao, Zhidan

doi:10.1007/s00531-019-01729-3

Cited by 12 publications

(5 citation statements)

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“…Extension‐related mafic dykes and contemporaneous melts in the Lhasa Terrane indicate that the timing of slab break‐off was ca. 57–50 Ma (Huang et al, 2016, 2017; Huang, Li, et al, 2019; Huang, Zhang, et al, 2019; Wang et al, 2019; Zhao et al, 2011; Zhu et al, 2015). When the slab completely detached, the hot upwelling asthenosphere would have caused extensive mantle and crustal melting, causing the magmatic flare‐up at ca.…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies have suggested that the collision between India and Asia first occurred in the central section of the Indus–Yarlung Tsangpo Suture (IYZS) between ~65 and 60 Ma (Ding et al, 2017; Wu et al, 2014). The Palaeocene–Eocene granites were more likely to have been triggered by slab break‐off than by subduction (Chung et al, 2005; Huang et al, 2017, 2019, 2019; Ji, Wu, Chung, Li, & Liu, 2009; Wen et al, 2008); therefore, the Lhasa Terrane is an ideal region to test the slab break‐off hypothesis. In addition, the slab tear may be connected to the slab break‐off, as suggested by Gessner, Gallardo, Markwitz, Ring, and Thomson (2013), and slab tearing may be a signal of the initial break‐off.…”

Section: Introductionmentioning

confidence: 99%

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Neo‐Tethyanslab tearing constrained by PalaeoceneN‐MORB‐like magmatism in southern Tibet

Tian

Huang

et al. 2020

Geological Journal

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Southern Tibet is a key region for investigating the magmatism that occurredduring the collision between India and Asia. The break‐off of the Neo‐Tethyan slab, after the onset of continental collision at ca. 65–60 Ma, affected the lithospheric thermal regime and led to a series of magmatic and tectonic events. Many magmatic rocks generated by slab break‐off have been reported in southern Tibet; however, which of these record the initial slab break‐off (i.e., slab tearing) is still an open question. The Lianxiang gabbros, which intrude an ophiolite in central‐southern Tibet, provide an ideal opportunity to investigate the footprint of the initial slab break‐off. Zircon U–Pb ages show that the Lianxiang gabbros crystallized at 57–53 Ma, coeval with other mafic dikes in southern Tibet. The Lianxiang gabbros are characterized by high Na2O (2.13–5.42 wt%), Al2O3(13.86–17.13 wt%), and V (188–346 ppm) contents and moderate Mg# (40.8–65.9). The gabbrosare slightly depleted in light rare earth elements [LREE; (La/Yb)N= 0.45–0.76], similar to normal mid‐ocean ridge basalt (N‐MORB). They also have low87Sr/86Sriratios (0.703538–0.705698) and highεNd(t) values (9.49–10.68), indicating that they were derived mainly from a shallow asthenospheric mantle source. Combining our results with data from other magmatism at ~57 Ma in the southern Lhasa Terrane, we propose that the N‐MORB‐type rocks reflect the tearing of the Neo‐Tethyan slab. The process of slab break‐off differed between western and eastern southern Tibet, possibly as a result of different lithospheric structures and compositions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Neo‐Tethyanslab tearing constrained by PalaeoceneN‐MORB‐like magmatism in southern Tibet

Tian

Huang

et al. 2020

Geological Journal

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“…Other major thrust faults in Lhasa Terrane were active during ~170–20 Ma as a result of the north‐directed compression caused by the subduction of the Neo‐Tethys oceanic slab and the subsequent collision of India‐Asian plates (Figure 1b; Li et al, 2017; Tafti et al, 2014; Yin et al, 1994). The regional outcropped strata in the Lhasa Terrane are mainly composed of widespread Mesozoic‐Cenozoic Gangdese Batholiths, abundant volcanic rocks include the Lower Jurassic Yeba Formation (190–174 Ma), the Upper Jurassic–Lower Cretaceous Sangri Group, and the Palaeocene–Eocene Linzizong successions, and Precambrian metamorphic basement (Dong et al, 2010; Huang et al, 2015, 2019; Mo et al, 2007, 2008; Pan et al, 2016; Zhang et al, 2020; Zhu et al, 2013). The voluminous Gangdese Batholiths located at the southern Lhasa subterrane extend up to 2500 km and are Late Triassic to Miocene (210–10 Ma) in age (Chapman & Kapp, 2017; Ji, Wu, Chung, et al, 2009; Ji, Wu, Liu, & Chung, 2009).…”

Section: Geological Background and Samplesmentioning

confidence: 99%

“…The Gangdese Batholith consists of voluminous intermediate‐felsic intrusive rocks and minor contemporaneous mafic rocks with Triassic to Miocene ages (Figure 1; Ji, Wu, Chung, et al, 2009; Zhu et al, 2008, 2017). Over the past few decades, a large number of studies have been conducted on these magmatic rocks to investigate the geodynamic processes of this collisional orogenic belt, such as the subduction of oceanic plate, continental collision, and continental subduction (e.g., Chung et al, 2009; Hao et al, 2016, 2019; Huang et al, 2016, 2019; Ji et al, 2012; Ji, Wu, Liu, & Chung, 2009; Jiang et al, 2014; Ma, Wang, Li, et al, 2013; Ma, Wang, Wyman, et al, 2013; Zeng et al, 2019). Nevertheless, a series of open questions, such as detailed geodynamic transition processes, the precise timing of the initial India–Asia collision, how and when the regional crust thickening was generated, and when rebound‐related uplift started, are still hotly debated.…”

Section: Introductionmentioning

confidence: 99%

Late Cretaceous and Early Palaeocene intermediate‐felsic intrusions from the Maizhokunggar region, southern Lhasa, Tibet: Implications for the geodynamic transition from oceanic subduction to continental collision

et al. 2023

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The tectonic transition from oceanic subduction to continental collision is a fundamental process during orogenesis, yet the nature of such transition and associated deep geodynamic processes for the Tibetan Plateau are still controversial. The long‐lived magmatism of the Gangdese Belt of southern Tibet provides an excellent opportunity to study the tectonic transition from subduction of the Neo‐Tethys oceanic lithosphere to the continental collision between Indian and Asian plates. We present zircon U–Pb–Hf isotopes, whole‐rock geochemistry, and Sr–Nd isotopes for the intrusions from Maizhokunggar, southern Lhasa Terrane. The zircon U–Pb dating indicates that two episodes of magmatism occurred in the Maizhokunggar region, ca. 70 Ma diorites and ca. 60 Ma granitoids. The ca. 70 Ma diorites are medium‐K calc‐alkaline and characterized by pronounced high‐field‐strength element depletion and light rare earth element enrichment, similar to arc‐type rocks. They have homogeneous (87Sr/86Sr)i ratios (0.70378–0.70424) and εNd(t) values (+2.6 to +3.4), and εHf(t) (+5.9 to +13.0) with relatively young depleted mantle model ages (307–762 Ma), suggesting that they were generated from the juvenile mafic lower crust induced by the underplating of basaltic magmas from depleted mantle wedge. The ca. 60 Ma granitoids, Kajiacun (KJC) granodiorites, and Qulongxue (QLX) and Bangdacun (BDC) monzogranites are high‐K series and metaluminous to weakly peraluminous. The KJC granodiorites with high Sr/Y ratios (25–43) are adakitic and were likely derived from partial melting of a thickened lower crust. The BDC monzogranites have more evolved Sr–Nd–Hf isotopes and older Nd–Hf model ages than the QLX monzogranites. These geochemical variations were mainly controlled by the fractionation crystallization with assimilation of ancient crustal materials. We propose that at ca. 70 Ma, the subduction of the Neo‐Tethys oceanic slab triggered the partial melting of the juvenile lower crust and formed the diorites with arc affinity, and then the initial collision (>60 Ma) between the Indian and Asian plates caused locally thickened lower crust, resulting in adakitic granodiorites. Our study sheds light on the lithospheric scale magma evolution from the deep mantle to the shallow crust during the critical geodynamic transition to collision, and early uplift.

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“…The composition of magma is further altered by crustal melting, as well as magma ascent and emplacement. Thus, the determination of magma sources and melting processes of granites can improve our understanding of the continental crust and aid in constraining the tectonic setting of magmatism (Huang et al 2019;Wang et al, 2019). Triassic granites are widespread along this suture zone and associated with ophiolite melange, which has been seen as a pivotal clue concerning the final closure location of the Paleo-Asian Ocean (Fig.…”

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confidence: 99%

Geochronology, Geochemistry and Sr‐Nd‐Hf Isotopes of Early–Middle Triassic Adakitic Plutons in Central‐eastern Jilin Province, NE China: Constraints on the Non‐synchronous Closure of Paleo‐Asian Ocean

Chao

Ding

Zhou³

et al. 2022

Acta Geologica Sinica (Eng)

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Shi et al., 2020a, b). This region is located between the Siberian and North China cratons (SC and NCC) and is made up of several microcontinents, including the Bureya, Khanka, Jiamusi, Songliao, Xing'an, and Erguna blocks, as well as the Sikhote-Alin accretionary complex (Fig. 1). NE China is an crucial component in the eastern section of the Central Asian Orogenic Belt (CAOB) and a key position that has a considerable impact on the closure of the Paleo-Asian Ocean (

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Geodynamic transition from subduction to extension: evidence from the geochronology and geochemistry of granitoids in the Sangsang area, southern Lhasa Terrane, Tibet

Cited by 12 publications

References 86 publications

Neo‐Tethyanslab tearing constrained by PalaeoceneN‐MORB‐like magmatism in southern Tibet

Neo‐Tethyanslab tearing constrained by PalaeoceneN‐MORB‐like magmatism in southern Tibet

Late Cretaceous and Early Palaeocene intermediate‐felsic intrusions from the Maizhokunggar region, southern Lhasa, Tibet: Implications for the geodynamic transition from oceanic subduction to continental collision

Geochronology, Geochemistry and Sr‐Nd‐Hf Isotopes of Early–Middle Triassic Adakitic Plutons in Central‐eastern Jilin Province, NE China: Constraints on the Non‐synchronous Closure of Paleo‐Asian Ocean

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