Tectonic environment and geodynamic significance of the Neo-Cimmerian Donqiao ophiolite, Bangong-Nujiang suture zone, Tibet

Girardeau, J.; Marcoux, Jean; Allègre, Claude J.; Bassoullet, Jean-Paul; Youking, Tang; Xiao, Xia; Yougong, Zao; Wang, Xibin

doi:10.1038/307027a0

Cited by 254 publications

(134 citation statements)

References 7 publications

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“…This model explains the low velocities and the differences in the travel time jumps. The assumption of a northerly dip would also be in agreement with the presence of Jurassic ophiolites along the BNS which were thrust southwards onto the Lhasa block (Girardeau et al, 1998). It has probably changed partly into a rightlateral strike-slip zone at least near the surface although its exact surface trace is not well defined.…”

Section: A New Evaluation Of the Seismic Wide-angle Data Along Indeptmentioning

confidence: 58%

About the lithospheric structure of central Tibet, based on seismic data from the INDEPTH III profile

2004

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Signals from 11 shots and 8 earthquakes, and numerous teleseismic events were recorded along the 400-km seismic line INDEPTH III in central Tibet and interpreted together with previous seismic and tectonic data. The abnormal behavior of various mantle phases reveals a complex Moho-transition zone, especially in the northern part of the line, in the Changtang Block, where the lower crust and the mantle show unusually low velocities, a shingled appearance of P n and no low-velocity layer in the upper crust. The strong east -west anisotropy in the Changtang Block is related to an easterly escape movement of the whole lithosphere, facilitated by the warm and weak layers in the lower crust and the upper mantle, bounded apparently by two prominent west -east running fault zones. D

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Section: A New Evaluation Of the Seismic Wide-angle Data Along Indeptmentioning

confidence: 58%

About the lithospheric structure of central Tibet, based on seismic data from the INDEPTH III profile

2004

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“…The Lhasa terrain, bounded to the north by the Bangonghu-Nüjiang suture and the Qiangtang terrain (Figure 1), belonged to the Gondwanan supercontinent during Paleozoic time (Liu and Einsele 1994;Zhang 1998Zhang , 2000, as evidenced by voluminous late Paleozoic tillites and glacio-marine faunas and Glossopteris floras (CIGMR-SCGR 1992; Zhang 1998). The mid-Tethys oceanic branch between the Lhasa and Qiangtang terrains was open by about Late Triassic time (Allegre et al 1984;Dewey et al 1988) and was closed along the Bangonghu-Nüjiang suture during Late Jurassic time (Girardeau et al 1984;Chang et al 1986). However, the evidence for subduction polarity is ambiguous (cf.…”

Section: Tectonic Framework Of Tibetmentioning

confidence: 94%

Mesozoic–Paleogene sedimentary facies and paleogeography of Tibet, western China: tectonic implications

2002

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In Early–Middle Triassic time, an abyssal sea covered most of the Songpan–Ganzi area, whereas a Central Tibetan Landmass, up to 400 km wide, may have stretched across the Lhasa and Western Qiangtang terrains. In Late Triassic time, the Songpan–Ganzi sea closed, the Central Tibetan Landmass receded westwards away from southern Western Qiangtang, a littoral environment dominated Eastern Qiangtang, middle Western Qiangtang, and southeastern Lhasa, a shelf environment existed only in northern and southeastern Western Qiangtang and northwestern Eastern Qiangtang, and abyssal flysch was spread along the eastern Bangonghu–Nüjiang zone. In Early–Middle Jurassic time, Songpan–Ganzi had become part of the Eurasian continent, abyssal flysch sediments stretched throughout the Bangonghu–Nüjiang zone, the Central Tibetan Landmass was only locally present in southwestern Lhasa, and the Tethyan epicontinental sea nearly covered all Tibet southwest of the Jinsajiang suture. In Late Jurassic time, oceanic flysch deposition existed only along the westernmost Bangonghu–Nüjiang zone, nearly all of Tibet was covered by coastal deposits, and shelf deposits existed only in northern Western Qiangtang and westernmost Lhasa. In the early stage of Early Cretaceous time, the majority of Qiangtang had become dry land, and a supralittoral environment dominated across the entire Lhasa terrain. However, during the late stage of the Early Cretaceous time, platform–shelf carbonates prevailed on southern Western Qiangtang and northern Lhasa. In Late Cretaceous time, the majority of Qiangtang had become emergent land, and a supratidal environment dominated Lhasa, the western rim of Western Qiangtang, and Tarim. In Paleogene time, the majority of Tibet became emergent land, and a supratidal environment existed only on the southern and western rims.The dominance of Upper Triassic–Jurassic shelf carbonates on the northwestern Eastern Qiangtang corner and the northern Western Qiangtang rim suggests a diachronous closing of the Jinsajiang paleo‐Tethys ocean, first during latest Triassic time when the Eastern Qiangtang terrain collided with Asia and finally in Jurassic time when the Western Qiangtang terrain was amalgamated to Asia. Rich picotites in Upper Triassic sandstones of middle Qiangtang suggest that the Shuanghu suture could have extended along the middle of Qiangtang, and stable shelf sedimentation during Late Triassic–Middle Jurassic time in the Western Qiangtang terrain shows that the suture probably could not have formed until Middle Jurassic time. The opening time of the Bangonghu–Nüjiang mid‐Tethys ocean could be Late Triassic time due to the existence of the Central Tibetan Landmass across Western Qiangtang and Lhasa during Early–Middle Triassic time. However, its opening was diachronous, at Late Triassic time in the east and at Early–Middle Jurassic time in the west. Furthermore, its closing was also diachronous, first in the east at the beginning of Late Jurassic time and later in the west in latest Jurassic to earliest Cretaceous time. Widespread upper Lower Cretaceous limestone up to 5 km thick over the northern half of Lhasa indicates that southern Tibet could have undergone an extensive backarc subsidence during late Early Cretaceous time. Continuous shallow marine sedimentation through the entire Cretaceous time over much of southern Tibet indicates that southern Tibet was intensely elevated only after the end of Paleogene time, its high topography being the product of the Indo‐Asian collision. Copyright © 2002 John Wiley & Sons, Ltd.

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“…In the Amdo basement, the middle to late Jurassic time was generally taken to mark the cessation of north-dipping oceanic subduction beneath the southern Qiangtang terrane [13,27,[64][65][66], and Early Cretaceous time marked the onset of Lhasa-Qiangtang collision [23,27]. LA-ICPMS U-Pb dating of metamorphic zircons from the interior of our newly found granulite lens gave a weighted mean age of 169±1.3 Ma, which we interpret to date the metamorphism of peak granulite facies.…”

Section: Timing Of Amdo Granulitesmentioning

confidence: 99%

“…The newly confirmed Mid-Qiangtang Suture (M-QTS) subdivides the Qiangtang terrane into the NorthQiangtang terrane (N-QT) and the South-Qiangtang terrane (S-QT) [4][5][6][7][8][9][10][11][12]. Several issues regarding the tectonic evolution of the two sutures remain controversial [5][6][7]9,[12][13][14][15]. Zhang et al [16] suggested that the S-QT was once associated with the Lhasa terrane, separated from the N-QT by the Shuanghu-Dingqing Paleotethyan ocean before the Early Mesozoic.…”

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confidence: 99%

Finding of high-pressure mafic granulites in the Amdo basement, central Tibet

et al. 2010

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High-pressure mafic granulites with a peak mineral assemblage of garnet + clinopyroxene + rutile + quartz were found in the Amdo basement, central Tibet. Two kinds of symplectites were identified that are composed of orthopyroxene + plagioclase ± spinel and hornblende + plagioclase around garnet, which were interpreted to develop during the retrogressing stages in the granulites. P-T estimates suggested that peak metamorphic conditions were about 860-920°C and 1.46-1.56 GPa, which retrogressed from post-peak phase at 820-890°C and 0.88-1.15 GPa to amphibolite facies at 550-670°C and 0.52-0.65 GPa. These three stages define a clockwise P-T path with near-isothermal decompression and cooling following the peak high-pressure metamorphism. This suggests that the Amdo granulites underwent an initial subduction to a deep crustal level of ~50 km and then were rapidly exhumed to a shallow crustal level (~20 km). The formation of Amdo granulites is considered to result from the arc-continent collision between the Amdo basement and the Qiangtang terrane in the middle Jurassic, which is a crucial step to the tectonic evolution of the Tibetan Plateau. high-pressure granulite, P-T path, Amdo basement, Bangong-Nujiang Suture, Tibet Citation: Zhang X R, Shi R D, Huang Q S, et al. Finding of high-pressure mafic granulites in the Amdo basement, central Tibet.

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Tectonic environment and geodynamic significance of the Neo-Cimmerian Donqiao ophiolite, Bangong-Nujiang suture zone, Tibet

Cited by 254 publications

References 7 publications

About the lithospheric structure of central Tibet, based on seismic data from the INDEPTH III profile

About the lithospheric structure of central Tibet, based on seismic data from the INDEPTH III profile

Mesozoic–Paleogene sedimentary facies and paleogeography of Tibet, western China: tectonic implications

Finding of high-pressure mafic granulites in the Amdo basement, central Tibet

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