Wednesday, September 17, 2008

17/09/2008 Greece: The Vourinos Ophiolite

Today was the first of 'our' days. We started at the fresh harzburgites of Doumaraki, before moving on to the Aetoraches Mine (pictured), to see the 'crescumulate' structures in the chromite of the shallow mantle sequence.

Myself and Dina then took most of the party up to see the Moho. Arjan walked the other side of the road, up the crustal sequence, whilst we showed the group the overturned Moho, with harzburgites of the mantle above and to the east, and cumulate dunite to the west.

The laterites and Pilori Cumulates were next (proto-arc clearly evidenced by wehrlites, dunites and pyroxenites in a thick cumulate pile). After this, we saw the Calpionellid limestones with belemnites, resting unconformably below Cretaceous limestones, on the ophiolitic pillows and dykes. The last stop of the day, the Langadakia Sheeted Dykes, are only about 300m down the road, so I decided to run there whilst everyone else took the cars. At speed (about 25kph). Running was fine, but slowing down took about a square inch off each of my feet. I limped to the outcrop, and, because Annie couldn't get down to the site, gave the spiel to the arriving masses.

Our talks that evening were given over dinner in Chromion by the German Terrain bunch, who seemed very (overly?) keen on double intraoceanic subduction zones, and inception of subduction caused by rifting. Not sure how this is meant to happen, but... well. Thomas Reischman was subject to a minor outburst from me at the end of his talk. I apologised later - but tiredness limits the length of my tether...!

No comments: