The multistage exhumation history of the Kaghan Valley UHP series, NW Himalaya, Pakistan from U-Pb and 40Ar/39Ar ages

The collision of India with Asia

“…In any case many different ages are found for the formation and subsequent exhumation of different terranes containing highpressure rocks in the Himalaya, as well as along the length of the Alpine-Tethyan orogen (79-75 Ma, 70-65 Ma Sesia zone, Italian Western Alps: Rubatto et al, 2011);(53-49 Ma, 44-38 Ma and 35-30 Ma Cycladic Eclogite-Blueschist, Greece: Forster and Lister, 2005); (47-46 Ma Kaghan Valley eclogite, Pakistan: Wilke et al, 2010) and these data can be interpreted as representing evidence of multiple, episodic accretion events as Tethys closed (Lister et al, 2001;Lister and Forster, 2009). …”

Late Cretaceous infant intra-oceanic arc volcanism, the Central Pontides, Turkey: Petrogenetic and tectonic implications

“…The 40 Ar/ 39 Ar analytical system of University of Potsdam has been described in recent literatures, such as, Wilke et al (2010) or Halama et al (2014). The system consists of (1) a New Wave Gantry Dual Wave laser ablation system with a 50 W CO 2 laser (wavelength 10.6 lm) for heating samples, (2) an ultra-high vacuum purification line with SAES getters and a cold trap kept at freezing temperature of ethanol, and (3) a high-sensitivity Micromass 5400 noble gas mass spectrometer with an electron multiplier to conduct pulse-counting analysis, which effectively works for very minor amounts of Ar gas.…”

Subduction, peak and multi-stage exhumation metamorphism: Traces from one coesite-bearing eclogite, Tso Morari, western Himalaya

“…The arc consists of magmatic rocks of Cretaceous age (Petterson and Windley, 1985) that formed during the subduction of Tethyan ocean crust prior to collision with India. The age of UHP metamorphism in eclogites and host rocks is dated at around 43-55 Ma (de Sigoyer et al, 2000;Donaldson et al, 2013;Kaneko et al, 2003;St-Onge et al, 2013;Tonarini et al, 1993;Treolar et al, 2003;Wilke et al, 2010b) and the exhumation to shallow crustal levels was already completed within 10 Ma based on Ar-Ar, apatite fission track and zircon U-He-Th ages as well as from diffusion modelling of zoning in garnet (Massonne and O'Brien, 2003;O'Brien and Sachan, 2000;Schlup et al, 2003;Wilke et al, 2010bWilke et al, , 2012. In contrast, the main Himalayan metamorphic series of the central (Nepal to Bhutan) Himalaya crop out well away from the suture zone with Asia and instead a wide expanse of low grade to nonmetamorphosed Palaeozoic sediments, bounded by the South Tibetan Detachment, crops out between the high-grade metamorphic rocks and the suture.…”