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SUMMARY:Assessment of lithospheric controls on Mesozoic volcanism in Mongo
 lia - Thomas Sheldrick - University of Leicester 
DTSTART:20181029T173000Z
DTEND:20181029T183000Z
UID:TALK109882@talks.cam.ac.uk
CONTACT:Ben Johnson
DESCRIPTION:From the Late Paleozoic to the Early Mesozoic\, Mongolia and N
 ortheast China have been influenced by the subduction of numerous oceans[1
 ] which have likely modified the lithospheric mantle. The Mesozoic was a t
 ime of anomalous widespread extension[2] across southern and eastern Mongo
 lia\, which produced Basin-and-Range type topography in Mongolia and China
 [3]. This extension occurred after a major collisional event associated wi
 th the closure of the Mongol-Okhotsk Ocean. Accompanying this phase of ext
 ension are large abundances of basin-infilling basalts which have had a nu
 mber of models proposed to explain their genesis.\n\nExamining Mongolian M
 esozoic volcanism is crucial for understanding magmatic processes across t
 he Central Asian Orogenic Belt. Yet there has been comparatively little st
 udy done on the Mongolian volcanism[4] compared to neighbouring China\, de
 spite the likelihood that the magmatism is linked to shared geological pro
 cesses.  This talk will initially introduce new whole-rock geochemical dat
 a for basaltic to intermediate volcanism\, including new low-Si and high-S
 i adakitic lavas\, across eastern and southern Mongolia. Some parallels be
 tween the volcanism in China and Mongolia will be emphasised. \n\nFocus on
  how the geochemistry changes with time will be used to assess lithospheri
 c controls. A fascinating story of how a preconditioned subduction-modifie
 d lithospheric mantle has been stripped away during the Mesozoic will unfo
 ld.            \n\n[1] Windley et al.\, 2010. American Journal of Science.
  310 (10)\, 1250-1293. [2] Meng Q. R. 2003. Tectnophysics. 369(3)\, 155-17
 4. [3] Graham et al.\, 2012. Phanerozoic Rift Basins and Sedimentary Basin
 s. 17\, 443-461. [4] Dash\, Batulzii\, et al.\, 2015. Gondwana Research 2
 7.1 (2015): 281-299.\n
LOCATION: Harker 1\, Department of Earth Sciences\, Downing Street
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