Geochronological and geochemical constraints on the petrogenesis of Early Eocene metagabbroic rocks in Nabang (SW Yunnan) and its implications on the Neotethyan slab subduction

Two Cenozoic tectonic events of N–S and E–W extension in the Lhasa Terrane: Evidence from geology and geochronology

“…This indicates that extension was a regional rather than local phenomenon Williams et al, 2001). In summary, we suggest that, in line with previous studies Mo et al, 2008;Wang et al, 2015;Williams et al, 2001;Xu et al, 2008;Yue and Ding, 2006), N-S and E-W extension in the Lhasa Terrane occurred during 60-53 and 17-13 Ma, respectively.…”

“…The magmatic 'flare-up' at ca. 50 Ma is regarded as the result of break-off of the Neo-Tethyan oceanic slab Lee et al, 2009;Wang et al, 2015;Wen et al, 2008). However, other studies propose a later slab break-off at ca.…”

“…Recently, Wang et al (2015) investigated the mafic dykes in the Eastern Himalayan Syntaxisn, suggested that the mafic magmatism was probably the equivalent of the extension. For the later extension, Williams et al (2001) and Miller et al (1999) proposed that N-S extension took place between 19 and 13 Ma based on the felsic dykes, which show the similar geochemistry characteristics with the monzonitic porphyritic dykes in this study (Fig.…”

Effects of crustal eclogitization on plate subduction/collision dynamics: Implications for India-Asia collision

“…In addition, no matter whether the model contains crust eclogitization or not, oceanic slab breakoff can significantly promote exhumation of the subducted continental crustal materials and asthenospheric upwelling, inducing a considerable heating in the collision zone. Our numerical results reasonably explain the flare-ups of the Gangdese igneous rocks in South Lhasa and rapid exhumation of the subducted continental crust at ~50 Ma in response to the slab breakoff (Wang Y et al, 2015(Wang Y et al, , 2014Chung et al, 2005). Meanwhile, the altitude of the collision zone can sharply increase by ~1 000 m in response to the slab breakoff (Fig.…”

Origin of Miocene Cu-bearing porphyries in the Zhunuo region of the southern Lhasa subterrane: Constraints from geochronology and geochemistry

“…However, previous researchers on ore-barren adakite-like porphyries in the west of Zhunuo revealed that they have more enriched Sr-Nd isotopes than ore-bearing adakite-like rocks in east of Zhunuo (Figs. 1b,10,11b) and proposed that these ore-barren adakite-like porphyries were derived from partial melting of ancient lower crust or were enriched by mixing with ultrapotassic magmas (Guo et al, 2007;Wang et al, 2014aWang et al, , 2015b. The Zhunuo porphyries are located on the boundary between the ore-barren and -bearing adakite-like porphyries in the west and east of southern Lhasa subterrane and distinct for consisting of both adakite-like porphyries with depleted (diorite porphyries) and…”