TY  - JOUR
A1  - Düsterhöft, Erik
A1  - de Capitani, Christian
T1  - Theriak_D - an add-on to implement equilibrium computations in geodynamic models
JF  - Geochemistry, geophysics, geosystems
N2  - This study presents the theory, applicability, and merits of the new THERIAK_D add-on for the open source Theriak/Domino software package. The add-on works as an interface between Theriak and user-generated scripts, providing the opportunity to process phase equilibrium computation parameters in a programming environment (e. g., C or MATLABV (R)). THERIAK_D supports a wide range of features such as calculating the solid rock density or testing the stability of mineral phases along any pressure-temperature (P-T) path and P-T grid. To demonstrate applicability, an example is given in which the solid rock density of a 2-D-temperature-pressure field is calculated, portraying a simplified subduction zone. Consequently, the add-on effectively combines thermodynamics and geodynamic modeling. The carefully documented examples could be easily adapted for a broad range of applications. THERIAK_D is free, and the program, user manual, and source codes may be downloaded from http://www.min.unikiel.de/similar to ed/theriakd/.
KW  - geodynamic modeling
KW  - thermodynamic modeling
KW  - Theriak/Domino
KW  - equilibrium assemblage
KW  - software
Y1  - 2013
U6  - https://doi.org/10.1002/ggge.20286
SN  - 1525-2027
VL  - 14
IS  - 11
SP  - 4962
EP  - 4967
PB  - American Geophysical Union
CY  - Washington
ER  - 
TY  - JOUR
A1  - Düsterhöft, Erik
A1  - Bousquet, Romain
A1  - Wichura, Henry
A1  - Oberhänsli, Roland
T1  - Anorogenic plateau formation The importance of density changes in the lithosphere
JF  - Journal of geophysical research : Solid earth
N2  - Away from active plate boundaries the relationships between spatiotemporal variations in density and geothermal gradient are important for understanding the evolution of topography in continental interiors. In this context the classic concept of the continental lithosphere as comprising three static layers of different densities (upper crust, lower crust, and upper mantle) is not adequate to assess long-term changes in topography and relief in regions associated with pronounced thermal anomalies in the mantle. We have therefore developed a one-dimensional model, which is based on thermodynamic equilibrium assemblage computations and deliberately excludes the effects of melting processes like intrusion or extrusions. Our model calculates the "metamorphic density" of rocks as a function of pressure, temperature, and chemical composition. It not only provides a useful tool for quantifying the influence of petrologic characteristics on density, but also allows the modeled "metamorphic" density to be adjusted to variable geothermal gradients and applied to different geodynamic environments. We have used this model to simulate a scenario in which the lithosphere-asthenosphere boundary is subjected to continuous heating over a long period of time (130 Ma), and demonstrate how an anorogenic plateau with an elevation of 1400 m can be formed solely as a result of heat transfer within the continental lithosphere. Our results show that, beside dynamic topography (of asthenospheric origin), density changes within the lithosphere have an important impact on the evolution of anorogenic plateaus.
Y1  - 2012
U6  - https://doi.org/10.1029/2011JB009007
SN  - 2169-9313
SN  - 2169-9356
VL  - 117
PB  - American Geophysical Union
CY  - Washington
ER  -