Late Devonian OIB alkaline gabbro in the Yarlung Zangbo Suture Zone: Remnants of the Paleo-Tethys?

Relicts of the Early Cretaceous seamounts in the central-western Yarlung Zangbo Suture Zone, southern Tibet

“…Allègre et al, 1984;Bédard et al, 2009;Dupuis et al, 2005;Pearce and Deng, 1988). However, recent studies indicate that the YZSZ is a complex subduction system probably preserving vestiges of both Paleo-Tethys and Neo-Tethyan Ocean (Dai et al, 2011a). The YZSZ comprises three basic lithotectonic units and from north to south they are: (1) the Xigaze forearc basin; (2) the Yarlung Zangbo ophiolitic belt; and (3) and the accretionary prism (Fig.…”

“…In the XGGB, however, the zircon U-Pb dating of the diabase indicates that they were formed at 122.3 ± 2.4 Ma (Wei et al, 2006b). Thus, the Sm-Nd age of the DQ might not represent the SSZ setting (Zhou, 2002), but probably marks the Paleo-Tethys (Dai et al, 2011a). In the YBW, the Sm-Nd isotope data on three tholeiitic samples show an isochron age of 147 ± 25 Ma, and magnesio-hornblende in tholeiitic basaltic dike yielded a 40 Ar/ 39 Ar age of 152 ± 33 Ma (Miller et al, 2003).…”

Crustal Velocity Structure of the Northeastern Tibetan Plateau from Ambient Noise Surface-Wave Tomography and Its Tectonic Implications

“…The deformation process of the Tibetan plateau is generally attributed to a series of collision events (Molnar et al, 1993;Owens and Zandt, 1997;Tapponnier et al, 2001;Chung et al, 2005;Dai et al, 2011). The deformation mechanism of the Tibetan plateau and its adjacent regions may be characterized by several models of collision between India and Eurasia, such as a unidirectional underthrust model and bidirectional subduction model.…”

Bryozoan fauna from the Permian (Artinskian-Kungurian) Zhongba Formation of southwestern Tibet

“…Sampling area NTH FIGURE 1. Position of the sampling area and tectonic setting of the Tibetan Plateau and Southern China (simplified after Dai et al, 2011). GCT: Great Counter thrust; ZGT: Zhongba-Gyangze thrust.…”