Exploring a lost ocean in the Tibetan Plateau: Birth, growth, and demise of the Bangong-Nujiang Ocean

Jurassic Evolution of the Dunhuang Basin and Its Implications for the Early History of the Altyn Tagh Fault, Northeast Tibet Plateau

“…This made the DHB and adjacent regions an intracontinental dynamic background. In the Early Jurassic (190–180 Ma), the Bangong‐Nujiang Ocean started to subduct beneath the Qiangtang Block (Hu et al., 2022 and reference therein). This might have led to the generation of some far‐field extensional basins in the northern Tibetan Plateau, including the Jungar, Tarim, Dunhuang, Tula, western Qaidam, Hexi, and Ordos basins (Figure 13).…”

“…These basins contain Early to Middle Jurassic alluvial to lacustrine sediments interbedded with volcanic rocks, such as tuff and basic lava in the southern and western Junggar Basin (Morin et al., 2018; Xie, 2002), olivine basalt and acidic volcanic rocks in the Chaoshui Basin (Xie, 2002), calc‐alkaline basalts in the DHB (Jia, 2019; Tao et al., 2009; Z. C. Zhang et al., 1998), and tuff in the Qaidam Basin (X. D. Zhao et al., 2020). The magmatic activity shows basin expansion and subcrustal necking beneath the basin and may have been affected by the collision of the Amdo microplate with the Qiangtang and Dongqiao‐Amdo ocean closures at 166–163 Ma (Hu et al., 2022). This sedimentation and magma activity display features of a passive rift development model (Bott, 1995; Corti et al., 2003), supporting our interpretation that the Jurassic DHB formed in response to the far‐field effect of the Bangong‐Nujiang ocean subduction and collision of the Lhasa with Qiangtang block.…”

“…C. Zhang et al, 1998), and tuff in the Qaidam Basin (X. D. . The magmatic activity shows basin expansion and subcrustal necking beneath the basin and may have been affected by the collision of the Amdo microplate with the Qiangtang and Dongqiao-Amdo ocean closures at 166-163 Ma (Hu et al, 2022). This sedimentation and magma activity display features of a passive rift development model (Bott, 1995;Corti et al, 2003), supporting our interpretation that the Jurassic DHB formed in response to the far-field effect of the Bangong-Nujiang ocean subduction and collision of the Lhasa with Qiangtang block.…”

Grain-scale zircon Hf isotope heterogeneity inherited from sediment-metasomatized mantle: Geochemical and Nd-Hf-Pb-O isotopic constraints on Early Cretaceous intrusions in central Lhasa Terrane, Tibetan Plateau

“…105-90 Ma, respectively (Fig. 12;Sun et al, 2015, Leier et al, 2007; (4) no southward subduction-related accretionary complex is preserved in the northern Lhasa Terrane (Hu et al, 2022). The Aruo intrusions provide new evidence of a change in the tectonic regime of the central-northern Lhasa Terrane at ca.…”

The proto-type basin and tectono-paleogeographic evolution of the Tarim basin in the Late Paleozoic

“…North China plate collided with Mongolia plate (Zhao et al, 1990) and the Qaidam-Qilian block had also been collaged with the Tarim block (Jolivet, 2015) (Figure 9D). Blocks such as Qiangtang in the south pushed northwards (Song et al, 2015;Xu et al, 2015;Hu et al, 2022;Ju et al, 2022), and the Paleo-Tethys Ocean continued to subduct beneath the Eurasian continent to the North (Pullen et al, 2008;Xiao et al, 2013;Yan et al, 2016;Li et al, 2020).…”