Slab breakoff triggered ca. 113Ma magmatism around Xainza area of the Lhasa Terrane, Tibet

Thickened juvenile lower crust-derived ~ 90 Ma adakitic rocks in the central Lhasa terrane, Tibet

“…Recent studies (Zhu et al, 2009a(Zhu et al, , 2011Sui et al, 2013;Chen et al, 2014) show that mantle materials may have been enhanced in the central-northern Lhasa subterrane at~113 Ma as indicated by the age vs. ε Hf (t) diagram (Fig. 4).…”

“…Numerous studies on the southern Lhasa terrane (i.e., Cretaceous Gangdese magmatic arc) have suggested an archetype of Andean-style margin related to the northward subduction of the Neo-Tethyan Ocean prior to the Cenozoic India-Asia collision (Yin and Harrison, 2000;Chung et al, 2005;Chu et al, 2006;Mo et al, 2007Mo et al, , 2008Ji et al, 2009). However, the generation of the Cretaceous magmatism in the central and northern Lhasa subterranes remains poorly understood, with proposed models including the northward flat/low-angle subduction of the Neo-Tethyan Ocean lithosphere Kapp et al, 2007a;Ma et al, 2013a, b, c) or the southward subduction of the Bangong-Nujiang Ocean lithosphere and subsequent Lhasa-Qiangtang collision (Mo et al, 2005;Pan et al, 2006;Zhu et al, 2009aZhu et al, , 2011Zhu et al, , 2013Sui et al, 2013;Chen et al, 2014). Recent studies identified significant mantle contribution in the Early Cretaceous magmatic rocks along the Lhasa-Qiangtang collision zone and attributed such contribution to the result of slab break-off of the Bangong-Nujiang Ocean lithosphere (Zhu et al, 2009a(Zhu et al, , 2011Sui et al, 2013;Chen et al, 2014).…”

“…However, the generation of the Cretaceous magmatism in the central and northern Lhasa subterranes remains poorly understood, with proposed models including the northward flat/low-angle subduction of the Neo-Tethyan Ocean lithosphere Kapp et al, 2007a;Ma et al, 2013a, b, c) or the southward subduction of the Bangong-Nujiang Ocean lithosphere and subsequent Lhasa-Qiangtang collision (Mo et al, 2005;Pan et al, 2006;Zhu et al, 2009aZhu et al, , 2011Zhu et al, , 2013Sui et al, 2013;Chen et al, 2014). Recent studies identified significant mantle contribution in the Early Cretaceous magmatic rocks along the Lhasa-Qiangtang collision zone and attributed such contribution to the result of slab break-off of the Bangong-Nujiang Ocean lithosphere (Zhu et al, 2009a(Zhu et al, , 2011Sui et al, 2013;Chen et al, 2014). Several studies on the Late Cretaceous potassium-rich and magnesium-rich volcanic rocks from the Lhasa-Qiangtang collision zone indicate that the crust of this region may have been thickened prior to the eruption of such volcanic rocks (Yu et al, 2011;Wang et al, 2014).…”

Crustal thickening and uplift of the Tibetan Plateau inferred from receiver function analysis

“…The heat flow measurement also establishes southern Tibet as a region of high heat flow (Tao and Shen, 2008). Continental collision is normally accompanied by slab break-off and related magmatism (van de Zedde and Wortel, 2001;Coulon et al, 2002;Chung et al, 2005a,b;Zhu et al, 2009a,b;van Hunen and Allen, 2011;Chen et al, 2014;Wang et al, 2014). Evidence for slab break-off following northward subduction of the Indian plate beneath the Tibetan Plateau has been reported in several studies (Hu et al, 2014;Lai and Qin, 2013;Ji et al, 2012;Lee et al, 2009).…”

Petrogenesis of Ajil Mafic Dykes from Eastern Belt of Peninsular Malaysia:Fractionated within Plate Lithospheric Mantle Magma Beneath the Eastern Malaya Block

“…In Ce/Pb versus La/Nb diagram 23 ( Figure 6 e), the dykes are plotted on subduction-related (influenced by metasomatism) or lithospheric mantle origin field. The influence of hydrous metasomatism in their mantle source region [27][28][29][30] is further supported by subchondritic Nb/Ta (12.3-18.4), superchondritic Zr/Hf (34.7-49.7) and also Th/Zr enrichment relative to Nb/Zr in Nb/Zr versus Th/Zr diagram 30 ( Figure 6 f ).…”