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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