Abstract
Simulation of metamorphic textures; combining thermal models of metamorphism with forward models of metamorphic textures
Abstracts with programs - Geological Society of America, Vol.28(7), p.424
Geological Society of America, 28th annual meeting
1996
Abstract
Mineral textures found in metamorphic terranes vary widely and often provide clues to heat and fluid transport, chemical reactions and pressure-temperature-time paths that characterize a particular metamorphic event. We are investigating the patterns of metamorphic textures produced in the crust during regional metamorphism by combining thermal models of metamorphism with simulations of metamorphic reaction mechanisms based on differential and irreversible thermodynamics. In this study, we have used a 3D integrated finite difference program (MOR3D, Travis et al. 1991: G. Res. Let. 18:1441-1444.) to investigate the transport of heat, fluid and dissolved species around mid-crustal intrusions that produce regional contact metamorphism similar to that found in western Maine. The results of the thermal calculations are output as a time-series of P-T data for each node in the volume of crust being modeled. The P-T data are then used as input for the Gibbs90 program (Spear et al. 1991: Am. Min. 76,. 2009), which uses differential thermodynamic techniques to calculate the mineral compositions, modes and whole-rock reaction at a node for each time step from the P-T data and the bulk composition of the rock present at the node. The sequence of whole-rock reactions is then used as input to the Seg93 program (Foster 1993: GSA Abs. 25, A264), which uses irreversible thermodynamics to calculate the reaction mechanisms and resulting mineral textures that develop at each node for each time step. The end result is an array of images that shows the type of rock texture expected for each time step at any node in the model. This method is advantageous in that it shows the spatial distribution of rock textures and mineral reactions produced by a specific thermal model, which can be readily compared to features observed in the field to assess the validity of proposed reaction mechanisms, fluid flow regimes or tectonic scenarios.
Details
- Title: Subtitle
- Simulation of metamorphic textures; combining thermal models of metamorphism with forward models of metamorphic textures
- Creators
- C. T Foster - University of IowaB. L Dutrow - Louisiana State UniversityBryan J Travis - Los Alamos National Laboratory
- Resource Type
- Abstract
- Publication Details
- Abstracts with programs - Geological Society of America, Vol.28(7), p.424
- Conference
- Geological Society of America, 28th annual meeting
- Publisher
- Geological Society of America (GSA)
- ISSN
- 0016-7592
- Alternative title
- Geological Society of America, 28th annual meeting
- Language
- English
- Date published
- 1996
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984240890702771
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