Petrogenesis and geodynamic significance of Neoproterozoic (∼925 Ma) high-Fe–Ti gabbros of the RenTso ophiolite, Lhasa Terrane, central Tibet

Zeng, Yunbo; Chen, Qin; Xu, Ji‐Feng; Chen, Jianlin; Huang, Feng; Yu, Hua-Zhong; Zhao, Peipei

doi:10.1016/j.precamres.2018.06.005

Cited by 15 publications

(6 citation statements)

References 76 publications

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“…This is because we also reconstruct the Lhasa block along the western margin of Australia ((Zhu et al, 2011), see Section 5.1) and here magmatism is preserved from ca. 925 Ma (Guynn et al, 2012(Guynn et al, , 2006Hu et al, 2018;Zeng et al, 2018) (Fig. 14d,e).…”

Section: Australia North China Lhasa and Tasmaniamentioning

confidence: 89%

Extending full-plate tectonic models into deep time: Linking the Neoproterozoic and the Phanerozoic

Merdith¹,

Williams²,

Collins³

et al. 2022

Preprint

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Recent progress in plate tectonic reconstructions has seen models move beyond the classical idea of continental drift by attempting to reconstruct the full evolving configuration of tectonic plates and plate boundaries. A particular problem for the Neoproterozoic and Cambrian is that many existing interpretations of geological and palaeomagnetic data have remained disconnected from younger, better-constrained periods in Earth history. An important test of deep time reconstructions is therefore to demonstrate the continuous kinematic viability of tectonic motions across multiple supercontinent cycles. We present, for the first time, a continuous full-plate model spanning 1 Ga to the present-day, that includes a revised and improved model for the Neoproterozoic-Cambrian (1000-520 Ma) that connects with models of the Phanerozoic, thereby opening up pre-Gondwana times for quantitative analysis and further regional refinements. In this contribution, we first summarise methodological approaches to full-plate modelling and review the existing full-plate models in order to select appropriate models that produce a single continuous model. Our model is presented in a palaeomagnetic reference frame, with a newly-derived apparent polar wander path for Gondwana from 540 to 320 Ma, and a global apparent polar wander path from 320 to 0 Ma. We stress, though while we have used palaeomagnetic data when available, the model is also geologically constrained, based on preserved data from past-plate boundaries. This study is intended as a first step in the direction of a detailed and self-consistent tectonic reconstruction for the last billion years of Earth history, and our model files are released to facilitate community development.

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Section: Australia North China Lhasa and Tasmaniamentioning

confidence: 89%

Extending full-plate tectonic models into deep time: Linking the Neoproterozoic and the Phanerozoic

Merdith¹,

Williams²,

Collins³

et al. 2022

Preprint

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“…This hypothesis is possibly inconsistent with the different Proterozoic detrital zircon age populations observed in Paleozoic sedimentary strata in the Lhasa (~1,170 Ma) and Qiangtang‐Himalayan terranes (~950 Ma), suggesting that the Lhasa Terrane drifted away from the Australian Plate rather than the Indian Plate (e.g., Zhu, Zhao, Niu, Dilek, et al, ). 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: 99%

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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“…Recent zircon U-Pb dating for gneissic rocks from the Nyainqêntanglha Group (ca. 0.93-0.76 Ga; Hu et al, 2005Hu et al, , 2018aHu et al, , 2018bZeng et al, 2018) indicate the presence of a Neoproterozoic metamorphic basement. A Palaeoproterozic-Mesoproterozoic crystalline basement also have been recognized in the Bomi area of the eastern segment of the central Lhasa subterrane (ca.…”

Section: Implications For the Reworking Of The Old Crust Of The Lhamentioning

confidence: 99%

“…In addition, all these Proterozoic gneissic rocks have experienced metamorphism at ca. 690-600 Ma (Chen et al, 2019;Dong et al, 2011;Xu et al, 2013;Zeng et al, 2018;Zhang, Dong, et al, 2012). Zircon Hf isotope is a powerful tool to trace the nature of basement rocks and the age of the continental crust (Griffin, Belousova, Shee, Pearson, & O'Reilly, 2004;Kemp et al, 2006 (Chu et al, 2006;Zhu et al, 2011;this work).…”

Section: Implications For the Reworking Of The Old Crust Of The Lhamentioning

confidence: 99%

“…The central Lhasa subterrane represents a microcontinent with Proterozoic–Early Cambrian crystalline basement that is mainly covered by the Permo–Carboniferous metasedimentary and upper Jurassic–lower Cretaceous sedimentary–volcanic units (Pan et al, 2012; Zhu et al, 2011, 2013; Zhu, Mo, Niu, et al, 2009). The Nyainqêntanglha Group in the middle part and the Bomi complex in the southeast part are considered as the presence of a Precambrian metamorphic basement in the central Lhasa subterrane (Chen et al, 2019; Hu et al, 2005; Hu et al, 2018a, 2018b; Xu et al, 2013; Zeng et al, 2018; Zhang, Zhang, Tang, & Xia, 2012). The Mesozoic volcanic rocks are mainly Early Cretaceous in age and predominantly high‐silica rhyolites and dacites with minor andesites and rare basalts and associated volcaniclastic rocks, occurring within a volcano‐sedimentary sequence that covers an area of ~2.0 × 10 4 km 2 with an average thickness of up to 1,000 m (Zhu et al, 2011).…”

Section: Geological Backgroud and Samplementioning

confidence: 99%

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Petrogenesis of ca. 113 Ma volcanic rocks in the central Lhasa subterrane, southern Tibet: Implications for the tectonic setting and continental crustal reworking

et al. 2020

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Voluminous Early Cretaceous volcanic rocks in the central Lhasa subterrane provide an ideal opportunity for understanding the mantle-crust interaction and tectonicmagmatic evolution of the Lhasa Terrane. Here, we report zircon U-Pb ages, geochemical and Sr-Nd-Pb-Hf isotopic data for the Early Cretaceous volcanic rocks, including high-silica rhyolites (117.2 ± 1.1 Ma) and contemporaneous andesites (114.1 ± 0.8 Ma) in the Sailipu area, central Lhasa subterrane. All these rocks show enriched light rare earth elements (LREE), and radioactive heat-generating elements (e.g., Th, U, K, and Pb) but depleted high-field-strength elements (HFSEs, e.g., Nb, Ta, P, and Ti). The different bulk-rock Sr-Nd-Pb and zircon Hf isotopic compositions of the rhyolites and andesites suggest that these rocks have distinct magma sources and petrogenetic history rather than an identical source involving assimilation-fractional crystallization process. The Sailipu high-silica rhyolites exhibit the characteristics of fractional crystallization and have varying zircon ε Hf (t) values (−12.2 to +5.2), negative ε Nd (t) values (−9.5 to −1.6), high and variable initial Sr isotopic compositions ([ 87 Sr/ 86 Sr] i = 0.7047-0.7116) and radiogenic Pb isotopic signatures ( 206 Pb/ 204 Pb = 18.784-18.802, 207 Pb/ 204 Pb = 15.722-15.737, and 208 Pb/ 204 . A combined process of magma mixing (involving crustal-derived felsic melts and mantle-derived mafic melts) and subsequent fractional crystallization were mainly responsible for the formation of these high-silica rhyolites. The Sailipu andesites show more enriched Sr-Nd isotopic compositions [( 87 Sr/ 86 Sr) i = 0.7088-0.7154, ε Nd (t) = −9.9 to −6.7] relative to rhyolites, and

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Petrogenesis and geodynamic significance of Neoproterozoic (∼925 Ma) high-Fe–Ti gabbros of the RenTso ophiolite, Lhasa Terrane, central Tibet

Cited by 15 publications

References 76 publications

Extending full-plate tectonic models into deep time: Linking the Neoproterozoic and the Phanerozoic

Extending full-plate tectonic models into deep time: Linking the Neoproterozoic and the Phanerozoic

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

Petrogenesis of ca. 113 Ma volcanic rocks in the central Lhasa subterrane, southern Tibet: Implications for the tectonic setting and continental crustal reworking

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Petrogenesis and geodynamic significance of Neoproterozoic (∼925 Ma) high-Fe–Ti gabbros of the RenTso ophiolite, Lhasa Terrane, central Tibet

Cited by 15 publications

References 76 publications

Extending full-plate tectonic models into deep time: Linking the Neoproterozoic and the Phanerozoic

Extending full-plate tectonic models into deep time: Linking the Neoproterozoic and the Phanerozoic

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

Petrogenesis of ca. 113 Ma volcanic rocks in the central Lhasa subterrane, southern Tibet: Implications for the tectonic setting and continental crustal reworking

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Petrogenesis and geodynamic significance of Neoproterozoic (∼925 Ma) high-Fe–Ti gabbros of the RenTso ophiolite, Lhasa Terrane, central Tibet