Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

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

“…Zhang et al, 2010;Z.M. Zhang et al, 2010;Eyuboglu et al, 2011;Korsch et al, 2011;Stern, 2011;Straub and Zellmer, 2012;Chen et al, 2014;Deng et al, 2014;Ma et al, 2014;Ortega-Gutiérrez et al, 2014;Shellnutt et al, 2014;Wang et al, 2014). Granitoids are the plutonic part of most continental arcs.…”

Tracing the Transhimalayan magmatic belt and the Lhasa block southward using zircon U–Pb, Lu–Hf isotopic and geochemical data: Cretaceous – Cenozoic granitoids in the Tengchong block, Yunnan, China

“…1). Despite the coherent appearance of the Transhimalayan magmatic belt, crustal heterogeneities in the Lhasa block caused large variations in e Hf (t) and related T DM values (Chiu et al, 2009;Ji et al, 2009;Ma et al, 2014;Xu et al, 2012;Zhu et al, 2011). Both Cretaceous -early Cenozoic granites and widespread early Cretaceous granitoids that occur mostly in the North and Central Lhasa block can be used to map e Hf (t) values (e.g.…”

“…1). The Tengchong block is therefore considered to continue northwards into the Lhasa block, which was bent around the eastern Himalayan syntaxis (Searle et al, 2007), but detailed internal correlations of the Tengchong block with the Lhasa block are at an early stage (Xu et al, 2012;Ma et al, 2014). The central Tengchong block consists of medium to low-grade metamorphic rocks that are correlated with the Mogok metamorphic belt to the west along the China-Myanmar border (Fig.…”

“…The central Tengchong block consists of medium to low-grade metamorphic rocks that are correlated with the Mogok metamorphic belt to the west along the China-Myanmar border (Fig. 2;Mitchell et al, 2007;Searle et al, 2007), accompanied by Paleozoic to Cenozoic (meta-) sedimentary rocks, and Mesozoic to Cenozoic igneous rocks, which comprise more than 50% of the exposed rocks (Li et al, 2014;Ma et al, 2014;Xu et al, 2012). The Tengchong block is cut by several Oligocene high-strain, ductile shear zones such as the NNE-trending dextral Nabang shear zone and the prominent N-S-striking dextral Gaoligong shear zone (Fig.…”

“…Three episodes of magmatism have thus far been documented in the Tengchong block: (1) Early Cretaceous magmatic rocks located in the eastern Tengchong block comprise a large N-Strending, quasi-continuous magmatic belt $400 km long and 25-40 km wide, consisting of predominantly granitic plutons that resulted from the subduction of Nujiang oceanic crust and continental collision between the Lhasa (+Tengchong) and Qiangtang (+Baoshan)-Sibumasu blocks (Yang et al, 2006; Zhu et al, Yunnan, 1975). U-Pb zircon ages from this study are designated by black squares, whereas those from Ma et al (2014) and Xu et al (2012) are shown as black diamonds. The histogram shows U-Pb-zircon ages of Ma et al (2014) in red, those of Xu et al (2012) in pink and those from the present study in yellow.…”