An innovative perspective for the evolution of Bangong-Nujiang Ocean: Also discussing the Paleo-and Neo-Tethys conversion

宋扬,; 曾庆高,; 刘海永,; 刘治博,; 李海峰,; 德西央宗,

doi:10.18654/1000-0569/2019.03.02

Cited by 31 publications

(4 citation statements)

References 56 publications

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“…From north to south, the Lhasa terrane is divided into the Northern Lhasa (NL), Central Lhasa (CL) and Southern Lhasa (SL) subterranes by the Shiquan River-Nam Tso mé lange zone (SNMZ) and the Luobadui-Milashan fault (LMF). The NL mainly consists of Mesozoic strata, including the Jurassic Jienu group (sandstone with volcanic interlayer), the Lagongtang Formation (flysch sedimentary), the Rila group (limestone), and the Cretaceous Qushenla and Duoni formations (volcanic sedimentary), the Langshan Song et al, 2019;Geng et al, 2020;Wang N et al, 2020).…”

Section: Geological Settingmentioning

confidence: 99%

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Petrogenesis and Geodynamic Implications of Early Cretaceous (∼130 Ma) Magmatism in the Baingoin Batholith, Central Tibet: Products of Subducting Slab Rollback

Tang

Wang

et al. 2022

Acta Geologica Sinica (Eng)

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The Baingoin batholith is one of the largest granitic plutons in the North Lhasa terrane. Its petrogenesis and tectonic setting have been studied for decades, but remain controversial. Here we report data on geochronology, geochemistry and isotopes of Early Cretaceous granitoids within the Baingoin batholith, which provide more evidence to uncover its petrogenesis and regional geodynamic processes. The Early Cretaceous magmatism yields ages of 134.4–132.0 Ma and can be divided into I‐type, S‐type and highly fractionated granites. The I‐ and S‐type granites exhibit medium SiO2, high K2O/Na2O with negative εNd(t) and εHf(t) values, whereas, the albite granites have very high SiO2 (79.04%–80.40%), very low K2O/N2O, negative εNd(t) and a large variation in εHf(t). Our new data indicate that these granitoids are derived from unbalanced melting in a heterogeneous source area. The granodiorites involved had a hybrid origin from partial melting of basalt‐derived and Al‐rich rocks in the crust, the porphyritic monzogranites being derived from partial melting of pelitic rocks. The albite granites crystallized from residual melt separated from K‐rich magma within the ‘mush’ process and underwent fractionation of K‐feldspar. We believe that the Early Cretaceous magmatism formed in an extensional setting produced by the initial and continuous rollback of a northward‐subducting slab of the NTO.

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Section: Geological Settingmentioning

confidence: 99%

“…1. (a) Tectonic maps of the Tibet, showing the location of the study area (after Song et al, 2014, 2019); (b) geological sketch map of the Baingoin batholith (afterSong et al, 2019;Geng et al, 2020;Wang N et al, 2020).…”

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confidence: 99%

Petrogenesis and Geodynamic Implications of Early Cretaceous (∼130 Ma) Magmatism in the Baingoin Batholith, Central Tibet: Products of Subducting Slab Rollback

Tang

Wang

et al. 2022

Acta Geologica Sinica (Eng)

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“…The Meso‐Tethys Ocean, also known as the Bangong–Nujiang Tethyan Ocean, represented by the Bangong–Nujiang Suture Zone (BNSZ) on the central Tibetan Plateau, is an important ocean basin in the Tethys tectonic domain (Kapp & DeCelles, 2019; Metcalfe, 2021). The timing and process of the Meso‐Tethys rifting and opening is hotly debated with possible timing from the Carboniferous to the Early Jurassic (Ren & Xiao, 2004; Pan et al ., 2012; Shi et al ., 2012; Zhai et al ., 2013; Zhu et al ., 2013; Chen et al ., 2017; Liu et al ., 2017; Li et al ., 2019; Song et al ., 2019; Zhang et al ., 2019; Peng et al ., 2020; Wu et al ., 2020; Zeng et al ., 2020; Metcalfe, 2021; Fan et al ., 2021a), which severely restricts our understanding of the role of this ocean basin in the Tethys tectonic domain and the in‐depth study of Tethys dynamics.…”

Section: Introductionmentioning

confidence: 99%

Tracing the sedimentary response to the rifting and opening of the Meso‐Tethys Ocean

et al. 2023

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Knowledge of the rifting and opening process of the Meso‐Tethys Ocean is important for understanding the evolution of the Tethys tectonic domain and for an in‐depth understanding of Tethys dynamics. Sedimentary rocks are faithful recorders of surface expressions of tectonic events and are thus expected to have recorded the rifting and opening of the Meso‐Tethys Ocean. This study presents petrography, sedimentology, zircon U–Pb geochronological data and Hf isotope data for the Carboniferous–Permian Shiquanhe stratigraphic succession in the Lhasa Terrane of the Tibetan Plateau. The data indicate that the 300 to 273 Ma Lagar and Angjie formations in the lower section of the Carboniferous–Permian Shiquanhe succession were deposited in the stable passive margin of northern Gondwana with sediment sources in Gondwanaland. However, the 273 to 252 Ma Xiala Formation in the upper section of the Carboniferous–Permian Shiquanhe succession was deposited in a tectonically active setting characterized by intense magmatic activity. Considering the transition from the Lagar and Angjie formations to the Xiala Formation, a significant change in depositional setting from tectonically stable to tectonically active occurred at ca 273 Ma. Similar Early–Middle Permian changes in depositional setting have also been identified in the South Qiangtang, Baoshan and Oman regions in the Tethyan tectonic domain. These widespread changes in depositional setting, together with Early–Middle Permian tectonic uplift and episodes of subsidence, as well as rift‐related magmatism in the South Qiangtang, Baoshan, Himalayan, Zagros, Oman and Turkey regions once located in northern Gondwana, constitute a complete record of continental rifting–ocean opening associated with the diachronous opening of the Meso‐Tethys Ocean during the Early–Middle Permian.

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“…The Kamado deposit is located in the eastern part of the Tethys tectonic belt, in Riwoche County of the Tibetan Autonomous Region, People's Republic of China. The Kamado magnesite deposit, with ore reserves of 57.09 Mt and MgO grades above 47%, is the largest ultramafic-associated magnesite deposit in China [32,33]. The genesis of this deposit was attributed to the surface chemical weathering of ultramafic rocks [34,35], similar to the Attunga magnesite deposit in the New England Orogen, New South Wales, Australia [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Genesis of the Large-Scale Kamado Magnesite Deposit on the Tibetan Plateau

Yu,

Hu,

Chen

et al. 2023

Minerals

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Lacustrine strata-bound magnesite deposits associated with Alpine-type ultramafic rocks are hydrothermal in origin. The magnesite ores of the Kamado deposit are unconformably underlain by mid-Jurassic marine carbonate and ultramafic rocks of the Bangong-Nujiang ophiolite suite and are in fault contact with hanging wall rocks composed of siliceous sinter. Three types of cryptocrystalline magnesite ores can be identified in Kamado: (1) strata-bound massive magnesites, representing the main ore type in the upper part; (2) banded ores in the lower part; and (3) some vein and stockwork ore in the ultramafic wall rocks. Integrated scanning electron microscopy, C–O isotope analysis, and geochemical analyses were carried out on the Kamado deposit. The results indicate that: (1) the orebody is composed of magnesite, with accessory minerals of aragonite, opal, and chromite; (2) the siliceous sinter and relatively high B (32.0–68.1 ppm) and Li (14.7–23.4 ppm) contents of the magnesite ores reflect long-term spring activity in Kamado; (3) the light carbon (δ13CV-PDB: −4.7 ± 0.3‰ to −4.1 ± 0.6‰) and oxygen isotopic compositions (δ18OV-SMOW: +12.3 ± 0.3 to +16.3 ± 0.1‰) of the stockwork ores in the foot wall rocks indicated that the carbon in fractures in the ultramafic rocks is from a mixture of marine carbonate and oxidized organic-rich sedimentary rocks, reflecting a typical “Kraubath-type” magnesite deposit; and (4) the relatively heavy carbon isotopic (δ13CV-PDB: +8.7 ± 0.4‰ to +8.8 ± 0.3‰) composition of the banded magnesite ores in the lower segment may have formed from heavy CO2 generated by anaerobic fermentation in the lakebed. Additionally, the carbon isotopic (δ13CV-PDB: +7.3 ± 0.3‰ to +7.7 ± 0.7‰) composition of the massive magnesite ores in the upper segment indicates a decline in the participation of anaerobic fermentation. As this economically valuable deposit is of the strata-bound massive ore type, Kamado can be classified as a lacustrine hydrothermal-sedimentary magnesite deposit, formed by continuous spring activities under salt lakes on the Tibetan Plateau, with the Mg mainly being contributed by nearby ultramafic rocks and the carbon mainly being sourced from atmosphere-lake water exchange, with minor amounts from marine carbonate strata.

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An innovative perspective for the evolution of Bangong-Nujiang Ocean: Also discussing the Paleo-and Neo-Tethys conversion

Cited by 31 publications

References 56 publications

Petrogenesis and Geodynamic Implications of Early Cretaceous (∼130 Ma) Magmatism in the Baingoin Batholith, Central Tibet: Products of Subducting Slab Rollback

Petrogenesis and Geodynamic Implications of Early Cretaceous (∼130 Ma) Magmatism in the Baingoin Batholith, Central Tibet: Products of Subducting Slab Rollback

Tracing the sedimentary response to the rifting and opening of the Meso‐Tethys Ocean

Genesis of the Large-Scale Kamado Magnesite Deposit on the Tibetan Plateau

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