An origin of ultraslow spreading ridges for the Yarlung-Tsangpo ophiolites

Liu, Chuan-Zhou; Wu, Fu‐Yuan; Liu, Tong; Zhang, Chang; Zhang, Weiqi; Zhang, Zhenyu; Zhang, Zhen; Wu, Wenbin; Lin, Yin-Zheng

doi:10.1016/j.fmre.2021.07.002

Cited by 22 publications

(9 citation statements)

References 90 publications

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“…Moreover, oceanic detachment faults have also been identified in the western Yarlung Tsangpo ophiolites, that is, the Purang ophiolite (C. Z. Liu et al., 2014). This result, along with the ultraslow‐spreading type Xigaze ophiolite, collectively supports the wide occurrence of ultraslow‐spreading oceanic lithospheres in the ophiolites along the entire Yarlung Tsangpo suture zone (C. Z. Liu et al., 2022).…”

Section: Discussionsupporting

confidence: 70%

“…These features are consistent with the observation of the mantle accompanied by thin crusts along the entire suture (e.g., Lian et al., 2016; Wu et al., 2014; Xiong et al., 2020; C. Zhang et al., 2016; L. Zhang et al., 2016). Further studies provided evidence for the unevenly distributed oceanic crusts and episodic lower crustal accretion, demonstrating that these ophiolites may have formed at ultraslow‐spreading ridges with a full spreading rate of ≤20 mm/yr (T. Liu, Dick, et al., 2021; T. Liu, Liu, et al., 2021; C. Z. Liu et al., 2022; Wu et al., 2014). Moreover, oceanic detachment faults have also been identified in the western Yarlung Tsangpo ophiolites, that is, the Purang ophiolite (C. Z. Liu et al., 2014).…”

Section: Discussionmentioning

confidence: 99%

“…(2019). On the other hand, slab‐derived fluids and/or melts may modify the overlying “mantle wedge,” resulting in its hydrous melting and the superimposition of arc‐type magmatism intruding the overriding plate (Figure 9b, F. Liu et al., 2021; C. Z. Liu et al., 2022; C. Zhang et al., 2019). This process would result in the addition of SSZ‐like geochemical signatures in some Neo‐Tethyan ophiolites, such as the east ophiolite belt in the Balkan Peninsula (Maffione, Thieulot, et al., 2015) and a small amount of arc‐type oceanic crusts in the Refahiye ophiolite (Uysal et al., 2015).…”

Section: Discussionmentioning

confidence: 99%

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Detachment Fault‐Hosted Subduction Re‐Initiation of the (Ultra)Slow‐Spreading Western Neo‐Tethys in the Jurassic

Liu,

et al. 2024

Geochem Geophys Geosyst

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Subduction initiation in oceans is key to understanding regional and global plate tectonics and ocean basin dynamics; however, its genetic mechanism is still enigmatic. The most famous model that predicts intraoceanic subduction initiation along transform faults or fracture zones (i.e., the Subduction Initiation Rule) has been widely used to explain arc‐like geochemical signatures within the Neo‐Tethyan ophiolites, but fails to account for the speculation and/or calculation of a sub‐parallel relationship between the Jurassic subduction zones and paleo ridges of the western Neo‐Tethys. Here, we propose a ridge‐parallel detachment fault‐hosted subduction re‐initiation model for the Jurassic western Neo‐Tethys. Based on field geological and geochemical evidence, we show that the Refahiye ophiolite in the İzmir–Ankara–Erzincan suture of northern Turkey has diagnostic characteristics indicative of (ultra)slow seafloor spreading. An (ultra)slow‐spreading nature also characterizes many Neo‐Tethyan ophiolites from the Alps to Southeast Asia, either at mid‐ocean ridges or in suprasubduction zones. Due to its extremely weak nature, detachment faults were probably a key candidate for the Jurassic intraoceanic subduction re‐initiation of the western Neo‐Tethys in response to far‐field compression after its long‐lived northward subduction. This model is applicable to both the Jurassic and Early Cretaceous ophiolites, but is questionable for the Late Cretaceous ophiolites. Its utility deponds on the kinematics of ancient plate boundaries and compositions of ophiolites. The detachment fault‐hosted subduction re‐initiation model can explain the arc‐like geochemical features of the Jurassic western Neo‐Tethyan ophiolites, but its effect on the structure and component of ophiolites is diverse.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Detachment Fault‐Hosted Subduction Re‐Initiation of the (Ultra)Slow‐Spreading Western Neo‐Tethys in the Jurassic

Liu,

et al. 2024

Geochem Geophys Geosyst

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“…Supra‐subduction zone (SSZ) ophiolites are increasingly recognized to be formed during SI (Casey & Dewey, 1984; Pearce, 2003; Stern, 2004; Stern et al., 2012; Whattam & Stern, 2011). Although most SSZ ophiolites do not have well‐kept lava sequences due to tectonic destruction, their mantle sequences and Moho transition zones (MTZ) are often better preserved (C. Z. Liu et al., 2022; Robertson et al., 2013). In particular, chromitites and dunites are closely associated in the mantle sequences and MTZ of ophiolites, and were produced by Mg‐rich magmatism via melt‐peridotite reaction (replacive origin) and crystal accumulation (cumulate origin) (Arai, 1997; Arai & Yurimoto, 1994; P. F. Zhang et al., 2016; Zhou et al., 1994, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Although most SSZ ophiolites do not have well-kept lava sequences due to tectonic destruction, their mantle sequences and Moho transition zones (MTZ) are often better preserved (C. Z. Liu et al, 2022;Robertson et al, 2013). In particular, chromitites and dunites are closely associated in the mantle sequences and MTZ of ophiolites, and were produced by Mg-rich magmatism via melt-peridotite reaction (replacive origin) and crystal accumulation (cumulate origin) (Arai, 1997;Arai & Yurimoto, 1994;P.…”

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confidence: 99%

Sluggish Slab Rollback at the Early Stage of Flux Melting During Subduction Initiation: Li Isotopic Evidence From the Coto High‐Al Chromite Deposit, Zambales Ophiolite, Philippines

et al. 2023

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The compositions of chromitites and dunites from Moho transition zone (MTZ) of the Coto block of the Zambales ophiolite, Philippines, are used to investigate the geodynamic transition from anhydrous to hydrous magmatism during subduction initiation (SI). Chromite grains in the chromitites have Cr# values [100 × Cr/(Cr + Al)] and TiO2 contents ∼35–50 and 0.05–0.30 wt.%, respectively, intermediate between those of chromite in typical MORB‐like lavas (Cr#, ∼20–60; TiO2, ∼0.6–1.7 wt.%) and boninites (Cr#, ∼70–85; TiO2, <0.4 wt.%). Olivine grains in the dunites have δ7Li values varying from ∼−2‰ to +21‰ with most between +10‰ and +15‰, beyond that of normal mantle (+4 ± 2‰) but comparable to those of some arc lavas (up to +12‰). The data set indicates that parental magmas of the high‐Al chromitites originated from hydrated harzburgitic mantle sources and formed temporally between MORB‐like and boninitic magmatism during SI, resulting from the early stage of flux melting in the Zambales proto‐forearc mantle. Modeling of Li diffusion reveals that the MTZ cooled down at a minimum rate of 0.1°C/yr in order to preserve the large δ7Li variation of olivine in the dunites, comparable to the thermal conditions below ultra‐slow to slow spreading ridges. Such a stage of transitional magmatism, although displaying notable slab contributions, took place at a sluggish period of slab rollback and asthenospheric upwelling, leading to a trough level of heat flow and magma production during the entire course of SI.

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Osmium and zinc isotope constraints on the origin of chromitites from the Yarlung-Zangbo ophiolites, Tibet, China

Lian,

Liu,

Cai

et al. 2024

Miner Deposita

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An origin of ultraslow spreading ridges for the Yarlung-Tsangpo ophiolites

Cited by 22 publications

References 90 publications

Detachment Fault‐Hosted Subduction Re‐Initiation of the (Ultra)Slow‐Spreading Western Neo‐Tethys in the Jurassic

Detachment Fault‐Hosted Subduction Re‐Initiation of the (Ultra)Slow‐Spreading Western Neo‐Tethys in the Jurassic

Sluggish Slab Rollback at the Early Stage of Flux Melting During Subduction Initiation: Li Isotopic Evidence From the Coto High‐Al Chromite Deposit, Zambales Ophiolite, Philippines

Osmium and zinc isotope constraints on the origin of chromitites from the Yarlung-Zangbo ophiolites, Tibet, China

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