Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision

Chen, Yaofei; Ding, Lin; Li, Zhenyu; Laskowski, Andrew K.; Li, Jinxiang; Baral, Upendra; Qasim, Muhammad; Yue, Yahui

doi:10.1016/j.tecto.2019.228311

Cited by 43 publications

(27 citation statements)

References 62 publications

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“…Combined with previous data on the age of magmatic rocks in the Bangor area, we suggest that the BNO should have closed later than 116 Ma (e.g., Dong et al, 2013; Gao et al, 2011, 2019; Teng, 2019; Wang et al, 2012). This conclusion is also supported by the following evidences: (a) sedimentologically, the Qushenla Formation (107–100 Ma), which is widely distributed in the BNSZ and presents lacustrine stage, is considered to be evidence for the closure of the BNO (Chen et al, 2017; Fan et al, 2014; Wu, Li, Xie, Wang, & Hu, 2013; Xu, Dilek, et al, 2015; Zhang et al, 2018), and the discovery of the argillaceous siliceous rocks in the Shiquanhe area, all formed in active continental margin environments with an age of ~108 Ma, also suggests that the closure time for the BNO should be the late period of Early Cretaceous (Liu, Wang, et al, 2018); (b) lithologically, zircon U–Pb geochronology of Early Cretaceous ophiolites (e.g., the Zhonggang Oceanic Island basalt at 116 Ma, the Tarenbon Oceanic Island basalt at 108 Ma, and the Pengcuo/Juowong cumulate gabbro at 120 Ma) also indicates that the BNO was not completely closed during the Cretaceous (Chen et al, 2020; Fan et al, 2014; Xu, Li et al, 2015 ; Zhu et al, 2006); (c) paleomagnetically, there is a paleo‐latitude difference of 7.2° ± 5.5° between the southern edge of the South Qiangtang Terrane and the northern edge of the northern Lhasa Terrane during the 115–120 Ma period in the Gaize area, and the paleolatitude difference between the two was reduced to 3.2° ± 3.1° during the period of 100–110 Ma (within the error range indicating coincidence). This result implies that the closure of the BNO in the central–western section should have occurred in the late period of Early Cretaceous (Cao et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Mesozoic multiple magmatic events in Bangor area: Constraints on the tectonic evolution of Bangong–Nujiang Tethys Ocean

Xie

Peng

et al. 2021

Geological Journal

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The Bangor area is located in the middle part of the Bangong–Nujiang Suture Zone (BNSZ), where a large number of Middle Jurassic‐Early Cretaceous magmatic rocks are exposed, and is a key area for studying the tectonic evolution of the Bangong–Nujiang Tethys Ocean (BNO). However, the arc magmatic system triggered by the southward subduction of the BNO has not been systematically identified in the northern margin of the Lhasa Terrane, and the timing of initial subduction and closure is still controversial. In this study, four granite, two amphibolite, and one gabbro samples from the Bangor area yield two clusters intrusive ages of 162–168 Ma and 121–133 Ma. The Stages I and II granites show whole‐rock geochemistry similar to those of continent arc magmatism, characterized by enrichment in large ionic lithophile elements (LILEs; e.g., Th, Rb, K) and depletion in high field strength elements (HFSEs; e.g., Nb, Ta, P, Ti). The Stage I magmatic rocks consist of granodiorite, amphibolite, and gabbro and have similar zircon εHf(t) values of −10.1 to −3.5, which may be formed by partial melting of enriched mantle wedge related to the southward subduction of the BNO. The Stage II highly differentiated I‐type granites show positive zircon εHf(t) values of +1.5 to +9.9, which are considered the product of highly differentiated processes via the mixed magma derived from depleted mantle and lower crustal rocks. The Stage II I‐type granites show negative zircon εHf(t) values of −9.2 to −0.7, which are derived from a mixed magma source generated by partial melting of lower crust and enriched lithospheric mantle. On the basis of data from this study and previous research studies, a four‐stage tectonic evolutionary model of the Bangong–Nujiang Tethys Ocean is constructed: Stage 1 (190–145 Ma), the northward and southward subduction of BNO formed a series of arc magmatism; Stage 2 (145–135 Ma), a magmatism lull occurred on the north side due to the subduction effect of the ocean plateau, while the southward subduction still continued; Stage 3 (135–116 Ma), the roll‐back of subducted slab enhanced the magmatism in this stage; and Stage 4 (<116 Ma), the closure of BNO lead to the formation of syn‐collisional magmatism.

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Section: Discussionmentioning

confidence: 99%

Mesozoic multiple magmatic events in Bangor area: Constraints on the tectonic evolution of Bangong–Nujiang Tethys Ocean

Xie

Peng

et al. 2021

Geological Journal

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“…However, this unconformity was also explained as the result of the collision between an oceanic plateau and the South Qiangtang block (Yan and Zhang, 2020), or between an oceanic ridge and the South Qiangtang block . Except above debates, geological and paleomagnetic data from the South Qiangtang, Lhasa and Bangong-Nujiang suture all suggest that the collision of the Qiangtang and Lhasa blocks most likely happened at 140-130 Ma (Figure 3;Zhu et al, 2016;Kapp and DeCelles, 2019;Yan et al, 2016;Bian et al, 2017;Ma et al, 2018;Chen Y et al, 2020).…”

Section: Tibetan Plateau: Multi-stage Closure Of Oceanic Basinsmentioning

confidence: 99%

Tectonic evolution and geodynamics of the Neo-Tethys Ocean

Zhu

Zhao

2021

Sci. China Earth Sci.

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The Neo-Tethys Ocean was an eastward-gaping triangular oceanic embayment between Laurasia to the north and Gondwana to the south. The Neo-Tethys Ocean was initiated from the Early Permian with mircoblocks rifted from the northern margin of Gondwana. As the microblocks drifted northwards, the Neo-Tethys Ocean was expanded. Most of these microblocks collided with the Eurasia continent in the Late Triassic, leading to the final closure of the Paleo-Tethys Ocean, followed by oceanic subduction of the Neo-Tethys oceanic slab beneath the newly formed southern margin of the Eurasia continent. As the splitting of Gondwana continued, African-Arabian, Indian and Australian continents were separated from Gondwana and moved northwards at different rates. Collision of these blocks with the Eurasia continent occurred at different time during the Cenozoic, resulting in the closure of the Neo-Tethys Ocean and building of the most significant Alps-Zagros-Himalaya orogenic belt on Earth. The tectonic evolution of the Neo-Tethys Ocean shows different characteristics from west to east: Multi-oceanic basins expansion, bidirectional subduction and microblocks collision dominate in the Mediterranean region; northward oceanic subduction and diachronous continental collision along the Zagros suture occur in the Middle East; the Tibet and Southeast Asia are characterized by multi-block riftings from Gondwana and multi-stage collisions with the Eurasia continent. The negative buoyancy of subducting oceanic slabs can be considered as the main engine for northward drifting of Gondwana-derived blocks and subduction of the Neo-Tethys Ocean. Meanwhile, mantle convection and counterclockwise rotation of Gondwana-derived blocks and the Gondwana continent around an Euler pole in West Africa in non-free boundary conditions also controlled the evolution of the Neo-Tethys Ocean.

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“…From north to south, the suture zone consists of assemblages formed during northward subduction of Neo-Tethyan oceanic lithosphere, namely the Mesozoic-Paleogene Gangdese magmatic arc, Cretaceous-Eocene Xigaze forearc basin, Jurassic and Cretaceous ophiolites, and Jurassic-Paleocene subduction complex ( Figure 1). The Gangdese magmatic arc intrudes the Lhasa terrane, a Gondwanan terrane that accreted to the southern margin of Asia in Middle Jurassic Sun et al, 2019) or earliest Cretaceous time (Chen et al, 2020;Dewey et al, 1988;Kapp et al, 2007). The magmatic arc primarily consists of calc-alkaline batholith that was active as early as Middle to Late Triassic until Paleogene time (Chu et al, 2006;Guo et al, 2013;Ji et al, 2009;Wang et al, 2017;Zhu et al, 2011) and a volcanic edifice represented by the ca.…”

Section: Lithotectonic Unitsmentioning

confidence: 99%

“…The Gangdese magmatic arc intrudes the Lhasa terrane, a Gondwanan terrane that accreted to the southern margin of Asia in Middle Jurassic (Ma, et al., 2017; Ma, et al., 2017; Sun et al., 2019) or earliest Cretaceous time (Chen et al., 2020; Dewey et al., 1988; Kapp et al., 2007). The magmatic arc primarily consists of calc‐alkaline batholith that was active as early as Middle to Late Triassic until Paleogene time (Chu et al., 2006; Guo et al., 2013; Ji et al., 2009; Ma, et al., 2017; Ma, et al., 2017; Wang et al., 2017; Zhu et al., 2011) and a volcanic edifice represented by the ca.…”

Section: Geologic Settingmentioning

confidence: 99%

Sedimentology and provenance of newly identified Upper Cretaceous trench basin strata, Dênggar, southern Tibet: Implications for development of the Eurasian margin prior to India–Asia collision

et al. 2020

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Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision

Cited by 43 publications

References 62 publications

Mesozoic multiple magmatic events in Bangor area: Constraints on the tectonic evolution of Bangong–Nujiang Tethys Ocean

Mesozoic multiple magmatic events in Bangor area: Constraints on the tectonic evolution of Bangong–Nujiang Tethys Ocean

Tectonic evolution and geodynamics of the Neo-Tethys Ocean

Sedimentology and provenance of newly identified Upper Cretaceous trench basin strata, Dênggar, southern Tibet: Implications for development of the Eurasian margin prior to India–Asia collision

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