Geochemistry and geochronology of the amphibolite blocks in ophiolitic mélanges along Bangong-Nujiang suture, central Tibet

Zircon U–Pb age and Hf isotopic compositions of Mesozoic granitoids in southern Qiangtang, Tibet: Implications for the subduction of the Bangong–Nujiang Tethyan Ocean

“…Age vs. location plot constraining the evolution of the Bangong-Nujiang Tethyan Ocean. Age data for continental arc and collisional magmatism from this study and literatures (Xu et al, 1985;Harris et al, 1988b;Schwab et al, 2004;Kapp et al, 2005;Zhao et al, 2008;Chang et al, 2011;Du et al, 2011;Li et al, 2011;Liu et al, 2012); for ophiolites from literatures (Zhou et al, 1997;Qiu et al, 2004;Zheng et al, 2006;Bao et al, 2007;Shi, 2007;Zhang et al, 2007;Wang et al, 2008;Qiangba et al, 2009;Fan et al, 2010;Liu et al, 2010;Qu et al, 2010;Shi et al, 2012), for non-marine strata from literatures (JPIGS (Jiangxi Provincial Institute of Geological Survey), 2004; Wang et al, 2004;Kapp et al, 2007).…”

Cretaceous volcanic rocks in south Qiangtang Terrane: Products of northward subduction of the Bangong–Nujiang Ocean?

“…Based on the distribution, ages, and tectonic characteristics of the ophiolitic fragments, the suture can be divided into three sectors from west to east, the Bangong Lake-Gertse (western sector), the Dongqiao-Amdo (middle sector) and the Dingqing-Nujiang (eastern sector) . Previous research indicates that most of the ophiolites have a suprasubduction-zone signature Kapp et al, 2003;Shi, 2007;Wang et al, 2008), while fewer ophiolites show MORB-like and oceanic island basalt (OIB) characteristics (Zhu et al, 2006b;Ye et al, 2004;Zhang et al, 2007). Various radiometric and radiolarian dating results have been reported for the ophiolitic and siliceous rocks.…”

Regional Lithological Mapping Using ASTER-TIR Data: Preliminary Case Study for the Tibetan Plateau and the Surrounding Area

“…Ninomiya et al [15,17] suggested the high correlation of the detected ultramafic rocks using ASTER-TIR data with the ones described in the published ophiolite map along the middle Yarlung Zangbo river [44] for the local area south of Xigaze (indicated in Figure 8), but this study suggests the agreement within the entire region of the map. Likewise, the good agreement in the mapping results for the ultramafic rocks of Yongzhu-Guomangco section [39,40], Dong Tso section [41] and Lagkor Tso section [41,42] is suggested.…”

“…The most important geological features targeted in this study include the ophiolite belts appearing at the surface along the sutures of the blocks, the quartzose and carbonite sedimentary rocks deposited as the accretion wedges associated with the subduction of the oceanic plate beneath the continental plate, the granitic rocks intruded with the island arc geological setting, and the distributions of the sulfate layers as the geological evidences of the neo-Tethys environment. The field geological studies so far (e.g., [36][37][38][39][40][41][42][43]) have revealed the distribution of the target lithological features at some limited local areas in the Tibetan Plateau. However, these terranes and suture zones are poorly characterized in central Tibet, with a >1000-km-long and up to 500-km-wide tectonic belt, where the field geological surveys have not yet accomplished well for the most part of the region because this area is remote and inaccessible (Figure 1).…”