Cutting Through the Flow: A Multi-disciplinary Special Session at AGU
We are convening a multidisciplinary special session that considers the
issues of imaging, measuring and characterizing melting and other phase
changes (at a range of scales) during failure of the crust in orogenesis.
T27: Orogenic Studies: Cutting Through the Flow
Modern deep crustal geophysical imaging techniques are immensely
informative, yet we still have difficulties in detecting low levels of
petrophysical heterogeneities (fluid, melt, phase changes) that may
nevertheless be crucial in governing rheology in orogenesis. Some rock
deformation studies suggest that the strength of "fertile" warm middle-lower
crust may be governed (at orogenic strain rates) by melt proportions that
are too small to be imaged geophysically. Prompt melt coalescence and/or
crustal scale localisation may however render this issue moot in terms of
imaging the deformation that is of significance. This session will bring
together experimental with geophysical, field and modelling studies of
active orogenesis (e.g., Anatolia, Andes, Tibet) to consider how we image,
measure and characterise the various modes of continental crustal anatexis,
weakening, failure, localisation, and flow.
One key issue we are eager to bring into discussion is the best
interpretation for those many instances we have all seen where MT data
identifies a clear candidate for a melt body while seismological data does not.
Invited papers include:
Frank Schilling:
"Imaging fluids and melt beneath the Andes and Tibet: relationship with
crustal tectonics"
Martin Unsworth (? - to be confirmed):
"agreement and discrepancy between seismology and MT-imaged melt candidates
in the crustal lithosphere"
Peter Zeitler / Peter Koons:
"Co-anatectic crustal failure in the absence of geophysically detectable
partial melt - seismologic, electromagnetic, mapping and geochronologic
evidence with modelling"
Ernie Rutter (to be confirmed):
<suggested title> Review of data from experimental rock deformation in the
presence of melt(-type) phases; implications for distribution
characteristics in the deforming crust"
We anticiapte a lively session! Abstract deadline is September 9th
(electronic submission). For those you unfamiliar, the American Geophysical
Union in San Francisco is possibly one of the best annual meetings in the
geosciences, in terms of the international and multidisciplinary scope that
is afforded by ca. 10.000 geoscientists under one roof for 5 days!
Considering this undertaking, AGU is notably palatable as a meeting that
stages a large breadth of geosciences. Moreover, it remarkably international
for a North American meeting, possibly due to its location half way (as it
were) "between" Europe and Asia.
Abstract submission details can be found:
http://submissions4.agu.org/submission/entrance.asp
Instructions:
Follow through the AGU steps. Those needing AGU sponsorship can contact
me directly ([log in to unmask]). At the window titled "Step 1
of 5: Create an Abstract for Submission" choose "Tectonophysics" from the
drop down list. When you get to "Step 3 of 5: Submittal Information" choose
"T27: Orogenic Studies: Cutting Through the Flow" from the drop down
list, and proceed to completion.
Info for the meeting overall (costs, registration, housing, etc):
http://www.agu.org/meetings/fm04/
Note that the absolute deadline for electronic abstract submission is the
9th of September. Visas are required by the US authorities for a number of
nationals visiting the USA. Further AGU details:
http://www.agu.org/pubs/visa_info.html
We look forward to seeing you in San Francisco!
Claudio Rosenberg, Martyn Unsworth, Eric Sandvol, and Michael Edwards
M.A. Edwards
Structural Processes Group, Vienna, Austria
Dept. of Geological Sciences
University of Vienna
Althanstrasse 14
Vienna, AUT A-1090
+43-1-4277-53446
[log in to unmask]
C. L. Rosenberg
Dept. Geol. Sci. Freie Universität Berlin
Freie Universität Berlin
Malteserstr. 74-100
Berlin, DEU 12249
+49 30 838-709 02
[log in to unmask]
Eric Sandvol
Dept. Geol. Sci., U. Missouri-Columbia
University of Missouri-Columbia
101 Geology Building
Columbia, mo, USA 65211-1380
(573) 884-9616
[log in to unmask]
Martyn Unsworth
Inst. Geophys. Res., U. Alberta
University of Alberta
Edmonton_Alberta, CAN T6G 2JI
(780) 492-5286
[log in to unmask]>
|