Dear all,

Please find enclosed the final programme for the Fault Zone Weakening
conference.  Sorry Chris, it's a long one - I know !

NOTE that the meeting is from March 7th -9th, not 8th-9th as advertised in
some places.

The deadline for pre-registration is upon us so PLEASE PRE_REGISTER NOW to
be guaranteed entrance to the Geol Soc for the meeting.

IT WILL BE MORE EXPENSIVE FOR THOSE WHO REGISTER ON THE DAY AND PLACES ARE
LIMITED !!!

To pre-register, go to the Web site (address in blurb below), find the
form, print it out and fax it to me ASAP.

All free/cheap accommodation has gone - you are on your own folks !

Finally, for all those attending and hoping to submit a paper for the
Special Publication, please remember that the deadline for submission is at
the meeting.
See you all there

Bob Holdsworth

+++++++++++++++++++++++++++==

Joint International Research Meeting
Tectonic Studies Group, Geological Society of London			     InterRidge
Structural Geology & Tectonics Division, Geological Society of America

THE NATURE AND TECTONIC SIGNIFICANCE OF FAULT ZONE WEAKENING

7-9 March 2000
Geological Society, Burlington House, London

SCOPE & AIMS OF MEETING:
Many faults appear to form persistent zones of weakness that fundamentally
influence the distribution, architecture and kinematic patterns of
crustal-scale deformation and associated processes in both continental and
oceanic regions.  To date, however, our understanding of the mechanisms
that lead to changes in fault zone rheology, their many geological
consequences and the larger-scale implications that they may have for
lithosphere dynamics are still poorly understood.  This meeting aims to
brings together an international group of Earth Scientists working in both
continental and oceanic regions to discuss a broad range of topics centred
upon the role of weak faults during crustal deformation.
Thematic sessions include:

The detachment fault problem in continental and oceanic regions
Shear localisation and fault zone weakening mechanisms
Fluid- and magma-induced changes in fault zone rheology
Fault nucleation, growth, reactivation & seismic hazard
Examples and affects of crustal- and lithosphere-scale weakening


VENUE; REGISTRATION; ACCOMMODATION: The meeting will last two and a half
days and will take place at the Geological Society of London, Burlington
House, Piccadilly, London W1V 0JU, United Kingdom.
In order to attract as many participants as possible, we intend to keep
costs to an absolute minimum. Registration fees are: Fellows and students
£5 (5 pounds); Non-Fellows £15 (15 pounds). Overseas participants may pay
on the day if preferred but must pre-register for the meeting.
Pre-registration forms are available at Web:
http://www.dur.ac.uk/~dgl0www1/rrg.htm. We are unable to offer financial
support for travel or accommodation, but the Geological Society has
negotiated special rates at nearby London hotels for conference attendees -
for further details, please contact Wexas International (Ph: +44
1715818632; Fax +44 1715891104). 
DEADLINES: Attendance will be limited to 200 and you must therefore
pre-register for this meeting. Deadline for pre-registration will be 31st
January 2000. We hope to compile a thematic set of papers arising from this
meeting and the deadline for the submission of completed manuscripts will
be 7th March 2000 in order to facilitate rapid publication. When you submit
your abstract please indicate whether you intend to submit a paper to the
thematic set. All queries should be sent by e-mail to Bob Holdsworth.

Convenors: 
Dr Bob Holdsworth, Dept of Geological Sciences, University of Durham,
Durham DH1 3LE.  Fax: +44(0)191-374-2510. e-mail -
[log in to unmask] Web: http://www.dur.ac.uk/~dgl0www1/rrg.htm
Dr Jerry Magloughlin,  Department of Earth Resources, Colorado State
University, Fort Collins, CO 80523, Fax: +1 970-491-6307.e-mail -
[log in to unmask]
Prof. R.J. Knipe, Rock Deformation Research, Dept of Earth Sciences,
University of Leeds, Leeds LS2 9JT. e-mail: [log in to unmask]
Dr R.A. Strachan, Geology Department, School of Construction and Earth
Sciences, Oxford Brookes University, Gipsy Lane, Headington, Oxford OX3
0BP. e-mail - [log in to unmask]
Prof. R.C. Searle, Dept of Geological Sciences, University of Durham,
Durham DH1 3LE.  Fax: +44(0)191-374-2510. e-mail [log in to unmask] 

Timetable

7th March
1330	WELCOME

1335	The nature and tectonic significance of fault zone weakening: an
introduction
E. Rutter, R.E. Holdsworth & R.J. Knipe (Manchester/Durham/Leeds, UK)

Detachment Faults

1350	Detachment faults at mid-ocean ridge inside corners, long-lived zones
of crustal weakness
J.R. Cann (Leeds, UK)

1410	Evidence for a long-lived detachment fault accompanying magmatic
accretion at the SW
Indian Ridge.
H.J.B. Dick, B. John, G. Hirth, H. Schouten & C.J. MacLeod (WHOI, USA)

1430	Evidence for low-angle simple shear during rifting of the Woodlark
Basin, SW Pacific (ODP Leg 180)
A. Robertson and the Shipboard Scientific Party (Edinburgh etc, UK)

1450	DISCUSSION

1505	TEA & POSTERS

1535 	Flow in the lower crust and consequences for detachment faulting
D. McKenzie, F. Nimmo, J. Jackson, P. Gans and E. Miller. (Cambridge, UK)

1555	Low-angle normal faults and microseismicity? An example from the
Altotiberina Fault (Central Italy).
C. Collettini & M.R. Barchi (Perugia, Italy)

1615	Distributed strain in gouge beneath detachment faults-insights drawn
from an analogy with sub-glacial deformation
D.S. Cowan   (Washington, USA)

Localisation and weakening processes #1

1635	Mechanisms of fault weakening and strengthening in porous rocks, and
associated changes in permeability.
I. Main, K. Mair, O. Kwon, S. Elphick & B. Ngwenya (Edinburgh, UK)

1655	Effects of humidity on frictional strength of granular fault gouge
K.M. Frye & C. Marone (MIT, USA)

1715	DISCUSSION

1730	POSTER INTRODUCTION 
Detailed structure and physical properties of the Nojima Fault Zone, Japan.
P.A. Pezard, H. Ito, M. Zamora & B. Celerier (CERAGE/Geological Survey of
Japan/IPG Paris/Montpelier, France/Japan)

1735	POSTER INTRODUCTION
The permeability structure of active fault zones in the Apennines (Italy)
and implications for fluid-driven weakening processes
G.Cello and E.Tondi (Università di Camerino, Italy)

1740	POSTER INTRODUCTION
Hydrofracturing and reactivation of pre-existing faults in a geothermal
reservoir: Examples from Northern Honshu, Japan
S. Tamanyu (Geological Survey, Japan)

1745 POSTER INTRODUCTION
Geometry of strike-slip fault termination
M.M. Khatib (Birjand, Iran)


1750	POSTER SESSION #1   Wine & Savouries

POSTER SESSION #1

Recent neotectonic activity at the SW Iberian margin: Detailed seismic
imaging of tsunamigenic structures
E. Gràcia, N. Zitellini, M. Rovere, F. Chierici, J.J. Dañobeitia and
BIGSETS Team
(Barcelona, Spain/Bologna ,Italy)

Serpentine-lubricated detachment faulting in the Troodos ophiolite:
implications for the strength of ocean lithosphere.
C.J. MacLeod (Cardiff, UK)

The depth and nature of seismic slip on mid-Atlantic Ridge Transform Faults.
R.E. Abercrombie & G. Ekstrøm (Harvard, USA)

40Ar/39AR results from K-feldspar-dominated psuedotachylyte from the
footwall of the Whipple detachment fault, California.
Hazelton, G., Grove, M. & Axen, G. (UCLA, USA)

Fault-controlled Differential exhumation-The case of the central menderes
core complex, Turkey
Gessner, K., Ring, U., Johnson, C., Güngör, T. and Passchier, C.
(Mainz/Imperial College/Dokuz Eylül, Germany/UK/Turkey)

Geometry of strike-slip fault termination
M.M. Khatib (Birjand, Iran)

The Role of the 'Kazerun Fault' as a pre-existing fracture zone in the
present formation and deformation of the Zagros fold-thrust belt in Iran
M. Sepehr, J.W. Cosgrove & M.P. Coward (Imperial College, UK)

Regional to local rock block configurations within a cratonic area.
Tirén, S.A. & Beckholmen, M.M. (GEOSIGMA/Uppsala, Sweden)

Neo and paleostress partitioning in the SW corner of the Caribbean plate
and its fault reactivation potential
Allan López, Wolfgang Frisch & Martin Meschede (I.C.E./ Tübingen, Costa
Rica/Germany)

Normal fault propagation mechanisms by 4D translucent analogue modelling
D. Marchal, J.P. Petit & M. Guiraud (IFP/Montpellier/Burgundi, France)

Detailed structure and physical properties of the Nojima Fault Zone, Japan.
P.A. Pezard, H. Ito, M. Zamora & B. Celerier (CERAGE/Geological Survey of
Japan/IPG Paris/Montpelier, France/Japan)

The permeability structure of active fault zones in the Apennines (Italy)
and implications for fluid-driven weakening processes
G.Cello and E.Tondi (Università di Camerino, Italy)

Hydrofracturing and reactivation of pre-existing faults in a geothermal
reservoir: Examples from Northern Honshu, Japan
S. Tamanyu (Geological Survey, Japan)

The influence of basal friction on the seismic signature of a fold-thrust
belt.
H. Koyi, K. Hessami & A. Teixell   (Uppsala/Barcelona, Sweden/Spain)

Energy partitioning during frictional melting on faults
K. O'Hara (Kentucky, USA)

Microfracturing associated with reactivated fault zones and shear zones:
what it can tell us about deformation history.
G. Mitra & Z. Ismat (Rochester, USA)

Clay-rich fault rocks and fault zone weakening: a case study from the
Alpine fault of New Zealand
L.N. Warr (Heidelberg, Germany)



8th March
Localisation and weakening processes #1….continued

0915	Clay-bearing fault gouge: processes and implications
B.A. van der Pluijm, Y. Yan, D.R. Peacor & C. Hall (Michigan, USA)

0935	New evidence to explain the nucleation of earthquakes on weak
`creeping' faults
D. Faulkner & E. Rutter (Manchester, UK)

0955	State of stress along the San Andreas fault and laboratory experiments
on deformation of simulated fault gouge: Implications for fault zone
constitutive laws
M. Zoback, J. Townend & P. Hagin (Stanford, USA)

1015	Observations of shear localisation in simulated fault zones
K. Mair & C. Marone (MIT, USA)

1035	DISCUSSION

1050	POSTER INTRODUCTION
The influence of basal friction on the seismic signature of a fold-thrust
belt.
H. Koyi, K. Hessami & A. Teixell   (Uppsala/Barcelona, Sweden/Spain)

1055	POSTER INTRODUCTION
Energy partitioning during frictional melting on faults
K. O'Hara (Kentucky, USA)

1100	COFFEE & POSTERS

1130	Structural, geochemical and kinematic analyses of strike-slip faults
in granitic rocks: Evidence for early slip localization and the structure
of seismogenic fault zones
J. Evans (Utah, USA)

1150	Earthquakes in the deep continental crust: seismogenic faulting at
high temperatures
J. Strehlau (Kiel, Germany)

1210	Rheological partitioning during multiple reactivation of the Paleozoic
Brevard Fault Zone, Southern Appalachians, USA.
R.D. Hatcher (Tennessee, USA)

1230	Multiple reactivation of a regional foliation at deeper and shallower
crustal levels
J.F. Magloughlin (Colorado, USA)

1250	DISCUSSION

1305	LUNCH & POSTERS

Fault nucleation, growth, reactivation & seismic hazard

1415	The geometric strength of fault systems
D.A. Ferrill, A.P. Morris, D. Sims & J.A. Stamatakos (Texas, USA)

1435	The growth of normal fault systems: implications for the 'weak fault'
concept.
Bailey, W.R., Bonson, C., Childs, C., Imber, J., Manzocchi, T., Meyer, V.,
Nell, P.A., Nicol, A., Strand, J., Tuckwell, G., Walsh, J.J. & Watterson,
J. (Liverpool, UK).

1455	Fault zone architecture and mechanical evolution.
R.J. Knipe, E. McAllister, R. Smallshire, S. Freeman, S. D Harris, Q. J.
Fisher , G. Jones, S.J.Jolley, J.R. Porter, E. Edwards (Leeds, UK)

1515	Constraints on oceanic fault nucleation and growth from TOBI
high-resolution sonar and numerical models
J. Escartin (CNRS, Paris, France)

1535	DISCUSSION

1550	POSTER INTRODUCTION
The influence of basement heterogeneities on fault linkage and damage zone
development in reactivated faults. 
L.E. Beacom, R.E. Holdsworth & T.B. Anderson (BP Amoco/ Durham/ Belfast, UK)

1555	TEA & POSTERS

1625	Evolution of mechanical efficiency during the reactivation of fault
systems
M. Cooke (Massachusetts, USA)

1645	The nature and origin of slip surface arrays in fault rocks
S.F. Wojtal (Oberlin, USA)

1705	4D analysis of normal fault propagation through a stratigraphical
heterogeneity
D. Marchal, J.M. Daniel & B. Colletta (IFP, France)

1725	DISCUSSION

Crustal-/lithosphere-scale processes


1735	POSTER INTRODUCTION
A 3-D numerical analysis of strain partitioning along a weak transform
fault in a transpressional setting: Application to the San Andreas fault in
Central and Northern California
J. Chery and M. Zoback (CNRS, Montpelier, France/ Stanford, USA)

1740	POSTER INTRODUCTION
Sequential ductile through brittle reactivations of major fault zones along
the accretionary margin of Gondwana in Central Argentina
C. Simpson, M. Krol, H. Short, S. Whitmeyer & R. Miro, (Boston/Geological
Survey of Argentina, USA/Argentina)

1745	POSTER INTRODUCTION
Initiation and evolution of late-stage orogenic wrench corridors
F. Neubauer (Salzburg, Austria)

1750	POSTER INTRODUCTION
Agrakhan-Tbilisi-Levant strike-slip displacement zone: major structure of
Caucasian sector of Alpine fold belt.
N. V.Koronovsky (Lomonosov University, Moscow, Russia)

1755	POSTER INTRODUCTION
A possible transform fault zone weakening mechanism
M.A. Goncharov & N.S. Frolova (Lomonosov University, Moscow, Russia)

1800	POSTER SESSION #2   Wine & Savouries


POSTER SESSION #2

Hotspot effects on faulting along the Galapagos spreading centre
J. Escartin, J. J. Dañobeitia & J. P.Canales  (CNRS, Paris/ CSIC, Barcelona
/WHOI, Woods Hole)

Weakening and reactivation of long-lived basement faults: the importance of
mid-crustal fracture networks
Jonathan Imber & Bob Holdsworth (Liverpool/Durham, UK)

Fault genesis and its tectonic significance in the eastern collision margin
of the Indian Plate 
A.A. Khan (Dhaka, Bangladesh)

Ductile shear zones  as counterflow boundaries in power-law fluids
Chris Talbot (Uppsala, Sweden)

Fracture characteristics in a reactivated fault zone: field data from the
Møre-Trondelag Fault Complex, Central Norway
J.M. Sleight & R.E. Holdsworth

Initiation and evolution of late-stage orogenic wrench corridors
F. Neubauer (Salzburg, Austria)

The influence of basement heterogeneities on fault linkage and damage zone
development in reactivated faults. 
L.E. Beacom, R.E. Holdsworth & T.B. Anderson (Belfast/Durham/BP Amoco, UK)

A 3-D numerical analysis of strain partitioning along a weak transform
fault in a transpressional setting: Application to the San Andreas fault in
Central and Northern California
J. Chery and M. Zoback (CNRS, Montpelier, France/ Stanford, USA)

Sequential ductile through brittle reactivations of major fault zones along
the accretionary margin of Gondwana in Central Argentina
C. Simpson, M. Krol, H. Short, S. Whitmeyer & R. Miro, (Boston/Geological
Survey of Argentina, USA/Argentina)

Agrakhan-Tbilisi-Levant strike-slip displacement zone: major structure of
Caucasian sector of Alpine fold belt.
N. V.Koronovsky (Lomonosov University, Moscow, Russia)

A possible transform fault zone weakening mechanism
M.A. Goncharov & N.S. Frolova (Lomonosov University, Moscow, Russia)

Focusing of magmatic and deformation events in the Kobberminebugt shear
zone, Ketilidian Orogen, South Greenland
McCaffrey, K.J.W, Curtis, M. & Hamilton, M.A. (Kingston/British Antartic
Survey/Geological Survey of Canada, UK/Canada)

Dry vs Wet Faults: Contrasting deformation styles and rheology along the
Møre-Trondelag Fault Complex, Cental Norway.
L.M. Watts, R.E. Holdsworth & D. Roberts (Durham/NGU, UK/Norway)

Multiple reactivation of the Homestake Shear Zone, Colorado.
T. Thornberry (Colorado, USA)

Fault-zone weakening during repeated reactivation: an insight from the
Apennine fold-and-thrust belt
E. Tavarnelli, F.A. Decandia, P. Renda, M. Tramutoli, Gueguen, E. &
Alberti, M. (Potenza/Siena/Palermo/Matera, Italy)

Long-term history (dextral to sinistral and ductile to brittle) of the
Damxung-Jiali shear zone in Southern Tibet
M.A. Edwards, L. Ratschbacher & INDEPTH Group (Freiberg, Germany)

Crustal detachment level change across an Archean-Proterozoic suture zone,
western United States.
T. Ehrlich (Colorado, USA)




9th March
Crustal-/Lithosphere-scale processes….continued

0915	Thermo-rheologic controls on deformation within oceanic transforms
K. Furlong & S. Sheaffer (Penn State, USA)

0935	Strain-localisation in the Central Andes of Northern Chile: transient
vs inherited zones of lithospheric weakness
C. Bonson & J. Grocott (Liverpool/Kingston, UK)

0955	Lithospheric and crustal reactivation of an ancient plate boundary:
the assembly and disassembly of the western Idaho suture zone
B. Tikoff, P. Kelso, C. Manduca, M. Markely & W. McClelland (Wisconsin, USA)

1015	Basins, basement and deformation: influences on the pattern of fault
reactivation during intraplate orogeny in central Australia.
M. Hand & M. Sandiford (Adelaide, Australia)

1035	DISCUSSION

1050	COFFEE & POSTERS

1120	Weak fault zones in Precambrian Sweden.
C.J. Talbot  (Uppsala, Sweden)

1140	Fault and shear zone localisation in actively thickening continental
crust
R. Butler, M.Casey, G. Lloyd, C. Bond, P. McDade, Z. Shipton & R. Jones
(Leeds, UK)

Localisation and weakening processes #2: fluid and magma effects

1200	Denudation of abyssal peridotites: inter-relations between deformation
and serpentinization in a slow-spread oceanic crust.
Y. Katzir, M. Cannat, C. Mevel & P. Agrinier (CNRS, Paris, France)

1220	Was the Glarus thrust really weak and why ?
M. Burkhard & N. Badertscher (Neuchâtel, Switzerland)

1240	DISCUSSION

1255	POSTER INTRODUCTION
Focusing of magmatic and deformation events in the Kobberminebugt shear
zone, Ketilidian Orogen, South Greenland
McCaffrey, K.J.W, Chadwick, B., Curtis, M, Garde, A.A. & Hamilton, M.A.
(Various, UK & Denmark)

1300	POSTER INTRODUCTION
Dry vs Wet Faults: Contrasting deformation styles and rheology along the
Møre-Trondelag Fault Complex, Cental Norway.
L.M. Watts, R.E. Holdsworth & D. Roberts (Durham/NGU, UK/Norway)

1305 POSTER INTRODUCTION
Fault-zone weakening during repeated reactivation: an insight from the
Apennine fold-and-thrust belt
E. Tavarnelli, F.A. Decandia, P. Renda, M. Tramutoli, Gueguen, E. &
Alberti, M. (Potenza/Siena/Palermo/Matera, Italy)

1310	LUNCH & POSTERS

1430	Pressure solution, phyllosilicates and the strength of mature faults.
B. Bos & C.J. Spiers (Utecht, Netherlands)

1450	Fluid-based reactions, fault weakening and basement thrust belt
detachment
C. Wibberley (Kyoto, Japan)

1510	Tectonically-modified frictional-viscous transition zones: geological
insights from long-lived basement fault zones
R.E. Holdsworth, J. Imber & M. Stewart (Durham/Liverpool/Southampton, UK)

1530	DISCUSSION

1540	TEA & POSTERS

1610	Episodic weakening and strengthening during synmetamorphic deformation
of a deep crustal shear zone in the Alps
K. Steffen & J. Selverstone (New Mexico, USA)

1630	Fluid involvement in strengthening and embrittlement of
high-temperature shear zones
G. Axen, J. Selverstone & T. Wawrzyniec  (UCLA/New Mexico/Houston, USA)

1650	The role of transcurrent shear zones as melt conduits and reactors and
as agents of weakening in the continental crust.
M.R. Handy, A. Mulch, M. Rosenau & C.R. Rosenberg (Giessen, Germany)

1710	DISCUSSION

1720	SUMMARY & FINAL DISCUSSION
R. Knipe

1740	CLOSE OF MEETING

==============================================================================

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
Man Utd - Treble winners and Kings of Europe
.....are you watching, Liverpool ?



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