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17:30 - 19:00 3 May 2012

A Volcano under China's Great Wall


Haldane Room | Wilkins Building (link Map)
Gower St | London | WC1E 6BT | United Kingdom

Open to: Academic | Alumni | Public | Student
Ticketing: Pre-booking essential

Speaker information

Dr. Roger Mason, UCL Department of Geology

The eastern end of China's Great Wall is at Shanhaiguan, Hebei Province, where it comes down to the Bohai Gulf about 400 km ENE of Beijing. The wall climbs steeply from the pass over a mountain massif called Houshihu Shan, an eroded volcano that was violently active for a brief period in early Cretaceous times, about 120 million years ago. Our team from China University of Geosciences, Wuhan, identified sub-volcanic structures such as ring-dykes, ring-faults, cone sheets and a collapsed caldera confirming the massif as a high level sub-volcanic structure. Such structures occur in ring complexes, and are familiar in Scotland and Ireland but none have been described from China in any detail. Some cone sheets contain pellet-like structures (accreted lapilli) that also occur in layers of erupted ash and we propose a new theory for their mode of formation.


Mark Huckvale
+44 (0) 20 7679 4087 | m.huckvale@ucl.ac.uk


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View from window at Great Wall of China