CRC 526 | Project area B

The brittle-ductile transition between the upper and lower Crust

B7 Rheological response of continental crust to thermal pulses related to magmatism and volcanism

Chakraborty, Hackl

Summary
This project aims to combine geochemical data from erupted rocks with computer modelling to better understand and quantify the relationship between igneous activity and deformation. Specifically, a thermal and deformation model will be developed which handles ductile as well as brittle behaviour of rocks surrounding magma reservoirs in an internally consistent manner. The thermo-mechanical model will use input data obtained through geochemical analysis and modelling of real systems. The geochemical part of the study will provide information about critical parameters such as extent and frequency of magma recharge as well as the depth, temperature and size of the magma reservoirs. The corresponding deformation field will be calculated using the numerical model and compared with observations of various kinds. These include surface deformation features measured by satellite around active volcanoes and the extent and nature of thermal aureoles surrounding deep seated plutons that are now exposed at the Earth’s surface. Through an iterative approach, the nature and evolution of the deformation field around such dynamic magma chambers will be characterized. This global approach incorporating geochemical, deformation and satellite data into an internally consistent deformation model to study realistic, dynamic magma chambers has never been attempted before. The results should significantly advance our understanding of the rheological response of the crust to real (i.e. dynamic) thermal events. In addition, the same results will further our understanding of a variety of phenomena ranging from seismicity associated with volcanic activity to evolution of permeability and ore formation around plutons.

B8 Rheologie information from forward modeling of mesoscopic structures

Hampel

Summary
Mesoscopic structures contain information on the rheological properties of rocks during deformation. These properties can be predicted from laboratory experiments only to a limited extent, in particular if polyphase rocks are involved. Within the framework of the new project B8 forward modelling will be applied to derive palaeo-rheological parameters from the comparison of modelled and natural deformation structures. Quantitative constraints in particular on the rock viscosity are of high relevance for a number of Earth science disciplines, including lithospheric-scale modelling of subduction zone processes.


B9 Microfabric development in peridotites during high stress deformation and subsequent annealing - experiment and nature

Trepmann, Stöckhert, Renner

Summary
The proposed project is concerned with the microfabric development in peridotites during high stress deformation and subsequent recrystallization at decaying stress. The aim is to identify the characteristic record for deformation related to stress redistribution in the upper mantle related to the seismic cycle. This goal will be approached by combining the natural record from the outcrop down to the TEM-scale with the record from experiments that are designed to model the natural stress history.


nach oben

B1 (1999/2-2002/1)

Prof. H.-P. Harjes, Dr. F. Rummel


B2 (1999/2-2002/1)

Prof. F. Roth


B3 (1999/2-2005/1)

Prof. B. Stöckhert


B5 (2002/2-2008/1)

Prof. B. Stöckhert


B6 (2005/2-2008/1)

Prof. B. Stöckhert