Reply to comment by W. Liu and B. Xia on “Age and geochemistry of western Hoh-Xil-Songpan-Ganzi granitoids, northern Tibet: Implications for the Mesozoic closure of the Paleo-Tethys ocean”

Zhang, Li Yun; Ding, Lin; Pullen, Alex; Kapp, Paul

doi:10.1016/j.lithos.2014.11.016

Cited by 4 publications

(3 citation statements)

References 47 publications

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Section: Discussionsupporting

confidence: 89%

“…A conclusion that Upper Triassic sediments in the Sichuan Basin were mainly sourced from the Qinling orogeny and the Longmen Shan thrust belt is consistent with previous studies (Figure 11b) (Chen, 2011;Deng et al, 2008;Luo et al, 2014;Shao et al, 2016;Zhang, Ding, Pullen, & Kapp, 2015;Zhang, Jia et al, 2015;Zhang, Zeng et al, 2015;Zhu et al, 2017). The sediment routing system is mostly eastward and south-eastward, as indicated by the paleocurrent data ( Figure 5) Roger et al (2008) westward subduction of the Ganze-Litang Ocean during the Late Triassic (Hou et al, 2004); (b) collision between Yidun arc and the Songpan-Ganze terrane at the end of the Triassic (Hou et al, 2004;; (c) intracontinental transpressional shortening between the eastern Songpan-Ganze terrane and the Sichuan Basin, forming the Longmen Shan thrust belt (e.g.…”

Section: Tectonic and Palaeogeographic Implicationssupporting

confidence: 91%

“…Harrowfield & Wilson, 2005;Li, Allen et al, 2003;Wang & Meng, 2008) and (d) slab retreat or rollback of Paleo-Tethys lithosphere (e.g. de Sigoyer, Vanderhaeghe, Duchêne, & Billerot, 2014;Pullen et al, 2008;Zhang, Ding et al, 2015).…”

Section: Tectonic and Palaeogeographic Implicationsmentioning

confidence: 99%

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Late Triassic tectonic inversion in the upper Yangtze Block: Insights from detrital zircon U–Pb geochronology from south‐western Sichuan Basin

Yan

Tian

et al. 2018

Basin Research

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The Sichuan Basin and the Songpan‐Ganze terrane, separated by the Longmen Shan fold‐and‐thrust belt (the eastern margin of the Tibetan Plateau), are two main Triassic depositional centres, south of the Qinling‐Dabie orogen. During the Middle–Late Triassic closure of the Paleo‐Tethys Ocean, the Sichuan Basin region, located at the western margin of the Yangtze Block, transitioned from a passive continental margin into a foreland basin. In the meantime, the Songpan‐Granze terrane evolved from a marine turbidite basin into a fold‐and‐thrust belt. To understand if and how the regional sediment routing system adjusted to these tectonic changes, we monitored sediment provenance primarily by using detrital zircon U‐Pb analyses of representative stratigraphic samples from the south‐western edge of the Sichuan Basin. Integration of the results with paleocurrent, sandstone petrology and published detrital zircon data from other parts of the basin identified a marked change in provenance. Early–Middle Triassic samples were dominated by Neoproterozoic (~700–900 Ma) zircons sourced mainly from the northern Kangdian basement, whereas Late Triassic sandstones that contain a more diverse range of zircon ages sourced from the Qinling, Longmen Shan and Songpan‐Ganze terrane. This change reflects a major drainage adjustment in response to the Late Triassic closure of the Paleo‐Tethys Ocean and significant shortening in the Longmen Shan thrust belt and the eastern Songpan‐Ganze terrane. Furthermore, by Late Triassic time, the uplifted northern Kangdian basement had subsided. Considering the eastward paleocurrent and depocenter geometry of the Upper Triassic deposits, subsidence of the northern Kangdian basement probably resulted from eastward shortening and loading of the Songpan‐Ganze terrane over the western margin of the Yangtze Block in response to the Late Triassic collision among Yangtze Block, Yidun arc and Qiangtang terrane along the Ganze‐Litang and Jinshajiang sutures.

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Section: Discussionsupporting

confidence: 89%

Section: Tectonic and Palaeogeographic Implicationssupporting

confidence: 91%

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Late Triassic tectonic inversion in the upper Yangtze Block: Insights from detrital zircon U–Pb geochronology from south‐western Sichuan Basin

Yan

Tian

et al. 2018

Basin Research

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The tectonic evolution of the East Kunlun Orogen, northern Tibetan Plateau: A critical review with an integrated geodynamic model

Dick

Chen

et al. 2020

Journal of Asian Earth Sciences

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Petrogenesis of Late Triassic high-Mg diorites and associated granitoids with implications for Paleo-Tethys evolution in the northeast Tibetan Plateau

et al. 2019

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Recent research on Paleo-Tethys tectonics has identified a huge late Paleozoic to Mesozoic igneous belt that extends more than 2500 km in the northeast Tibetan Plateau. However, the magma genesis and evolution in this belt remains a subject of considerable debate. This paper presents a combination of zircon U-Pb ages, mineral compositions, major and trace element concentrations, and Sr-Nd-Hf isotopic data for the plutons across the Zhiduo arc belt that marks the site connecting different tectonic-magmatic units. The studied rocks from one quartz diorite, two granodiorite plutons, and their mafic enclaves define a continuous compositional evolution varying from high- to medium-K calc-alkaline gabbroic diorite to granodiorite. Laser ablation–inductively coupled plasma–mass spectroscopy U-Pb analyses of zircons from these three plutonic suites and one mafic enclave yield Late Triassic ages of 222–217 Ma, establishing that the mafic and felsic magmas were nearly coeval. All these rocks are featured by zoned hornblende and plagioclase with Mg- and Ca-rich mantles or oscillatory change in compositions. They exhibit high and variable MgO (up to 4.88–5.66 wt%), Cr, and Ni contents except that one granitoid pluton (Dangjiangrong) possesses high Co (up to 145.0 ppm). They are characterized by subduction-type trace element patterns, with prominent positive Rb, Th, Pb, and K anomalies and negative Ba, Nb, P, and Ti. Together with continuous and heterogeneous Sr-, Nd-, and zircon Hf-isotopic compositions, it suggests that these Late Triassic high-Mg diorites and associated granitoids were generated through magma mixing and fractional crystallization accompanied by chemical exchange. Taking into account the magmatic record from nearby regions, we suggest that double-sided subduction and rollback of the subducting Paleo-Tethys oceanic slab is the main mechanism to generate geochemically-varied magmatism in the northeast Tibetan Plateau, and eventually close the Paleo-Tethys Ocean during much of the Late Triassic.

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Reply to comment by W. Liu and B. Xia on “Age and geochemistry of western Hoh-Xil-Songpan-Ganzi granitoids, northern Tibet: Implications for the Mesozoic closure of the Paleo-Tethys ocean”

Cited by 4 publications

References 47 publications

Late Triassic tectonic inversion in the upper Yangtze Block: Insights from detrital zircon U–Pb geochronology from south‐western Sichuan Basin

Late Triassic tectonic inversion in the upper Yangtze Block: Insights from detrital zircon U–Pb geochronology from south‐western Sichuan Basin

The tectonic evolution of the East Kunlun Orogen, northern Tibetan Plateau: A critical review with an integrated geodynamic model

Petrogenesis of Late Triassic high-Mg diorites and associated granitoids with implications for Paleo-Tethys evolution in the northeast Tibetan Plateau

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