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GEO-METAMORPHISM  1999

GEO-METAMORPHISM 1999

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Subject:

Exhumation meeting: Rennes

From:

"Giles Droop" <[log in to unmask]>

Reply-To:

Giles Droop

Date:

Wed, 10 Feb 1999 11:32:11 GMT

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (223 lines)

EXHUMATION OF METAMORPHIC TERRANES

UNIVERSITY OF RENNES

31 August - 2 September 1999

SECOND CIRCULAR

This conference is sponsored by the Metamorphic Studies Group, a special 
interest group affiliated to both the Mineralogical Society of Great Britain 
(1) and the Geological Society of London (2).

The aim of this meeting is to discuss the processes by which metamorphic 
terranes are unroofed, the relative importance of these processes in 
different types of metamorphic terrane, and the rates at which these 
processes operate.  The meeting is designed to bring together petrologists, 
structural geologists, geochronologists, clastic sedimentologists, 
geophysicists, theoretical modellers and geomorphologists in a multi-
disciplinary attack on the problem.

The meeting is being convened by:

Dr. Michel Ballevre, Geosciences Rennes, Universite de Rennes I, 
F-35042 Rennes Cedex, France.
tel:    (+33) 2 99 28 60 81
fax:    (+33) 2 99 28 26 02
e-mail: [log in to unmask]

Dr. Simon Cuthbert, Department of Civil, Structural & Environmental 
Engineering,University of Paisley, Paisley PA1 2BE,  UK.
tel:    (+44) 141 848 3263
fax:    (+44) 141 848 3275
e-mail: [log in to unmask]

Dr. Giles T.R. Droop, Department of Earth Sciences, University of Manchester,
Oxford Road, Manchester  M13 9PL,  UK.
tel:    (+44) 161 275 3809
fax:    (+44) 161 275 3947
e-mail: [log in to unmask]

PLEASE FORWARD THIS CIRCULAR TO ANY OF YOUR COLLEAGUES WHO YOU THINK 
MAY NOT BE AWARE OF THE MEETING, AND WHO MAY WISH TO ATTEND

1  Registered charity 233706            2 Registered charity  210161

Scope of the meeting:-

A number of key topics have been identified which will be addressed during 
the meeting, possibly forming the basis of discrete sessions.  These include:

   Metamorphic records of exhumation:  Decompressive P-T paths; 
		Diffusion in minerals:  the "geospeedometry" approach.

   Exhumation of ultra-high-pressure rocks.

   Kinematics of tectonic exhumation:  the macro-, meso- and micro-structural 
		record.

   Exhumation rates constrained by high-resolution geochronology.

   Sedimentological records of unroofing in foreland and intramontane basins.

   Present-day erosion rates in mountain belts.

   Thermal / mechanical models of exhumation.

   Exhumation of metamorphic terranes in contrasting geo-tectonic settings.

   Fluid movement during exhumation.

These topics will be addressed in oral and poster sessions.

The following keynote speakers have been approached and have agreed to talk 
at the meeting:

	J.P. Platt      (UCL, London)   V. Sautter      (MNHN, Paris)
	C. Passchier    (Mainz)         J.R. Wijbrans   (Amsterdam)
	B. Bluck        (Glasgow)       D.W. Burbank    (Penn. State)
	A. Chemenda     (Nice)          A. Hynes        (McGill)

Language:-

The official language of the meeting will be English.  All talks and posters 
must be in English.  

Venue:-

The meeting will be held at the University of Rennes campus, which is located 
ca. 8 km east of Rennes city centre.  Lectures will be held in the Louis 
Antoine Lecture Theatre in No. 2 building.  Poster sessions will be held in 
the same building.  Two slide projectors, an overhead projector and two 
projection screens will be available for use in the lecture theatre.

Posters:-

One or two rooms will be devoted to poster sessions.  The maximum size for 
posters is 1.2m high by 1.0m wide.  Posters should be prepared in advance and 
erected by the participants.

Registration:-

The registration fee covers all conference materials, tea/coffee, invited 
speakers' costs, and costs of administration. There is a reduced registration 
fee for students and also for members of the following learned societies:  
the Mineralogical Society of Great Britain, the Geological Society of 
London, the Societe Geologique de France, and the Societe Francaise de 
Mineralogie et de Cristallographie.  

A registration form (MS.Word6 format) is being sent out with this circular.  
In the event of decoding problems, hard copies of the registration form may 
be obtained from Giles Droop (address above).  

The deadline for registration is 1 May 1999.  There is an extra late-
registration charge for registrations received after this date.   
All costs itemised on the registration form include an 11% institutional 
overhead levied by the University of Rennes.

Accommodation:-

Accommodation is available on campus in the form of rooms in student halls of 
residence.  Hotel accommodation is also available close to the campus and in 
the city centre.  Please contact Michel Ballevre if you need more detailed 
information about the hotels available.

Meals:-

For delegates in student accommodation, breakfast will be available at the 
University Restaurant, but for delegates in hotels, breakfast will be 
provided by the hotel. Lunch (specially prepared for the meeting) will be at 
the University Restaurant.  Tickets will be issued for meals ordered via the 
registration form.  Evening meals will also be obtainable at the University 
Restaurant, but there are also many good restaurants in the city centre for 
those who wish to forage further afield.  The Conference Dinner will be on 
the evening of 1st September.  Tea/coffee is included in the registration fee.  
Breakfast and lunch will be included in the costs of the meeting (see 
registration form), but, with the exception of the Conference Dinner, evening 
meals will not.

Publication:-

The proceedings of the meeting will be published as a book by the 
Mineralogical Society of Great Britain, and will be edited by Michel Ballevre, 
Simon Cuthbert and Giles Droop.  Both keynote and contributed papers will be 
published.  Papers should contain a substantial review component.  
Papers should be prepared in Mineralogical Magazine format, and should be 
submitted as hard copy (three copies please).  The deadline for submission of 
papers will be 1 November 1999, although we would encourage submission at the 
time of the meeting.

Travelling to Rennes:-

Flying to Rennes is possible via Paris, though may involve changing airports 
from Charles de Gaulle to Orly.

Travelling to Rennes by train from Paris is very easy and convenient;  the 
high-speed train (TGV) takes only two hours from Paris (Gare de Montparnasse) 
and leaves almost every hour.  There are also a few TGV from CdG airport.

The conference organisers are exploring the possibility of hiring a bus to 
take participants from Paris (Gare Montparnasse) to Rennes on the afternoon 
of 30 August, provisionally departing at 2pm.  The cost would probably be 
about 100 FRF.  A return bus on the evening of 2 September is also a 
possibility.  Viability in either case would depend on the number of people 
interested.  If you are interested in travelling by this method, please 
indicate on the registration form.

By car, Rennes is an easy 350km from Paris, mostly along motorway.  Delegates 
travelling from the UK by car can cross the English Channel by ferry from 
Portsmouth to St Malo.  From St Malo to Rennes is only 70km by road.

Field Trip:-

The meeting will be followed by a 4-day field trip to review the metamorphic 
evolution of the Variscan Belt of southern Brittany.  Attention will be 
focussed mainly on the high-pressure rocks, including the blueschist-facies 
rocks of the Ile de Groix, and the eclogite-facies rocks of the Champtoceux 
Nappe and the Vendee.  Some key structures for constraining exhumation 
mechanisms of high-P rocks (e.g. synkinematic leucogranites with C-S 
structures in extensional detachments) will be shown.  As a counterpart to 
the high-pressure rocks, the classic migmatites of the Morbihan area will 
also be visited.  

The field trip will be led by Michel Ballevre, Denis Gapais and Gaston Godard.  

The field trip will be limited to a maximum of thirty participants.  
Participation is open to any bona-fide geologists, but priority will be given 
to people who are also registering for the meeting.  Places on the trip will 
be filled on a first-come-first-served basis.  If you wish to book a place on 
the trip, please indicate on the registration form.  Financially, this trip 
is completely separate from the meeting in Rennes.  The cost of the trip is 
likely to be about 3000 FRF;  detailed information about costs will be 
circulated to interested people at a later date.

Provisional Itinerary:-

2 Sept. Depart ca. 5 pm.  Drive to Lorient.  Overnight in Lorient.

3 Sept. Ferry to Ile de Groix.  Blueschists and associated rocks.  (Many of 
the best sites are now protected, but we shall visit some localities where it 
is still possible to collect beautiful samples.)  Overnight on Ile de Groix.

4 Sept. Blueschists (cont'd).  Back to Lorient.  Quiberon Shear Zone (a 
detachment zone with a syn-kinematic leucogranite, contributing to the 
exhumation of the blueschists).  Migmatites of the Morbihan area (just below 
the detachment).  Overnight in Vannes.

5 Sept. South Armorican Shear Zone (S-C fabrics).  Champtoceaux Nappe:  
garnet-kyanite-mica-schists and eclogites;  cross-section of the nappe along 
the Loire:  inverted metamorphism associated with thrusting of the upper 
migmatitic unit over the lower unit rich in kyanite- and glaucophane-
eclogites.  Overnight at Nantes.

6 Sept. Eclogite-facies metamorphism in the Vendee:  different types of 
eclogite, and overprinting of cordierite-bearing assemblages in the country-
rock gneisses by high-P garnet-kyanite parageneses.  End of the trip.  Return 
to Rennes via Nantes airport and railway station (2 hours to Paris by TGV). 

------------------------------------------------------------------------------



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