Dear all,
This is the first anouncement of a Tectonic Studies Group meeting on shear
zones to be held in March 2002. Information is available in the March issue
of Geoscientist (page 25) and also at a Web site
http//www.st-and.ac.uk/~www_sgg/conferences.html
Further details and contact information are given below.
TRANSPORT AND FLOW PROCESSES WITHIN SHEAR ZONES.
TSG MEETING, BURLINGTON HOUSE, PICCADILLY, LONDON
18th-19th March 2002
POST-CONFERENCE FIELDTRIP TO SHEAR ZONES IN THE SCOTTISH HIGHLANDS
20th-24th March 2002
Shear zones are approximately tabular zones of concentrated deformation and
flow that accommodate movement of adjacent, relatively undeformed rock
units in the deeper parts of the Earth's crust and mantle. They are
important examples of the heterogeneous nature of deformation in natural
rocks and also act as fundamental pathways for the advective transport of
mineralising fluids, magmas and heat in the lithosphere. The importance of
shear zones and their products, recognised since the 19th century, have
been observed on a variety of scales from microstructural to regional, with
recent work attempting for the first time to incorporate their development
into numerical models of lithosphere-scale deformation.
This conference will bring together Earth Scientists who apply a diverse
range of techniques and methodologies to better understand shear zone
processes and evolution. It is hoped that the meeting will provide an
up-to-date assessment of our current understanding of shear zones and that
it will act as a forum for the development of future interdisciplinary
approaches and collaboration.
SELECTED PAPERS WILL BE SUBMITTED FOR INCLUSION IN A GEOLOGICAL SOCIETY
SPECIAL PUBLICATION ARISING FROM THE MEEETING. The deadline for the
submission of papers will be at the meeting (19th March 2002) in order to
allow rapid publication. Contributions incorporating and/or combining
laboratory analytical methods, field studies and dynamic modelling of shear
zones are welcome.
Topics which may be covered in special themed sessions include:
SHEAR ZONES IN THE LITHOSPHERE:
Attributes and processes in mantle shear zones; crust-mantle linkages;
remote-sensing of deep shear zones; spatial and temporal controls of shear
zone reactivation; deformation partitioning and localisation; scaling
attributes of shear zones.
FLOW PATTERNS IN NATURAL SHEAR ZONES:
The geometric and kinematic characterisitics and evolution of shear zones;
vorticity and spin; modelling strain partitioning and localisation; fabric
analyses.
GRAIN SCALE PROCESSES OF SHEAR ZONES:
Micro-rheology - deformation mechanisms and regimes; recognising diffusive
creep in shear zones; chemical, strain and energy partitioning processes in
polymineralic rocks; modelling flow and grain-scale deformation mechanisms;
geochemical analysis.
ADVECTIVE TRANSPORT PROCESSES:
Deformation and metamorphism/melting feedback mechanisms; fluid sources and
migation paths, mechanisms and pathways of mineralisation; magma transport
and rheology; heat budget of shear zones.
QUANTITATIVE ANALYSIS AND MODELLING OF SHEAR ZONES:
Application of new analytical methods; geochronology of shear zones,
analogue modelling studies; numerical modelling studies; integration of
modelling work with studies of natural shear zones.
POST-CONFERENCE FIELDTRIP TO SHEAR ZONES IN THE SCOTTISH HIGHLANDS
20th - 24th March 2002
It is intended to run a post-conference fieldtrip to spectacularly exposed
shear zone localities in the Scottish Highlands where ongoing studies are
currently shedding new light on shear zone attributes and processes across
a broad range of crustal depths and timescales. We shall visit some classic
examples of shear zones developed within the Precambrian Lewisian Complex
(Gairloch, Canisp, Laxford), the Caledonian Moine Thrust Zone mylonites
(Faraid Head, Eriboll) and shear zones developed within the internal Moine
Nappe (Eriboll to Bettyhill).
Costs will be kept to a minimum with hostel-based accommodation + self
catering OR bar-meals.
CONVENORS:
Ian Alsop, Crustal Geodynamics Group, School of Geography & Geosciences,
University of St.Andrews, Fife, Scotland, KY16 9AL UK.
(e-mail: [log in to unmask])
Ken McCaffrey & Bob Holdsworth, Reactivation Research Group, Dept of
Geological
Sciences, University of Durham, Durham DH1 3LE, UK
(e-mail: [log in to unmask], [log in to unmask])
Martin Hand, Geology & Geophysics, University of Adelaide, Adelaide SA
5005, Australia (e-mail: [log in to unmask])
--
Dr Bob Holdsworth,
Reactivation Research Group,
Dept of Geological Sciences,
University of Durham,
Durham DH1 3LE,
UK
Tel +44(0)1913742529
Fax+44(0)1913742510
e-mail: [log in to unmask]
Web: http://www.dur.ac.uk/~dgl0www1/rrg.htm
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