Dear colleagues,

We encourage you to submit an abstract for the following session at the EGU General assembly in Vienna, 07 - 12 April 2013.

TS3.3/EMRP4.6

Taking the temperature of ductile deformation

http://meetingorganizer.copernicus.org/EGU2013/session/12072

Conveners: 

Djordje Grujic, Dalhousie University

Richard Law, Virginia Tech

Michael Stipp, GEOMAR Kiel

The overriding aim of this session is to compare and discuss the microstructure- and texture-based thermometers and trace element thermometers on mylonites.

Mylonites are useful for studying kinematics and geometry of deformation; however, connecting the microstructural and textural data to metamorphic conditions and timing of deformation remains mostly qualitative. Likewise, linking the absolute timing of deformational events or stages to pressure-temperature paths is commonly hampered by: 1) difficulty in correlating thermobarometric and chronologic data from the same rock sample, 2) relatively large uncertainties associated with conventional thermobarometry, 3) lack of suitable metamorphic mineral assemblages in mylonites.

A very recent development for determining the crystallization temperatures of one of the most commonly studied mineral phases using trace element thermometry is the Ti-in-quartz thermometer (TitaniQ). Potentially, this technique can be applied to quartz mylonites, but the approach remains controversial. However, if this technique is robust, timing of deformation could be determined by comparing Ti-in-quartz data with thermal histories determined by geo- and thermochronology. Conversely, the crystallization temperatures of dateable accessory phases can be retrieved using trace element thermometry: Ti-in-zircon, Zr-in-rutile, Zr-in-titanite. The combination of these two approaches allows linking U-Pb ages with pressure-temperature conditions, a fundamental step in constraining rates of metamorphic processes and the link between deformation and the U–Pb ages of accessory minerals.

Invited speakers:

Whitney Behr, University of Texas Austin

Holger Stünitz, University of Tromsø

Jay Thomas, Rensselaer Polytechnic Institute

We particularly encourage contributions that: 

1) assess the technical limitations of currently available deformation thermometers, 

2) provide case studies of observed linkages between deformation thermometry and PT paths inferred from classical metamorphic petrology, 

3) provide case studies of deformation thermometry applied to specific structural/tectonic settings.

Abstract submission deadline is 09-January-2013.

In case you would like to apply for support, please submit an application no later than 30 November 2012.

For details on how to submit an abstract, please visit:

http://meetings.copernicus.org/egu2012/abstract_management/how_to_submit_an_abstract.html