Book contents
- Frontmatter
- Contents
- Preface
- Acknowledgments
- I Fundamentals of thrustbelts
- II Evolving structural architecture and fluid flow
- III Thermal regime
- 11 Introduction to the thermal regimes of thrustbelts
- 12 Role of pre-orogenic heat flow in subsequent thermal regimes
- 13 Role of structural and stratigraphic architecture in thermal regimes
- 14 Role of syn-orogenic burial and/or uplift and erosion in thermal regimes
- 15 Role of deformation in thermal regimes
- 16 Role of fluid movement in thermal regimes
- IV Petroleum systems
- References
- Index
15 - Role of deformation in thermal regimes
Published online by Cambridge University Press: 23 December 2009
- Frontmatter
- Contents
- Preface
- Acknowledgments
- I Fundamentals of thrustbelts
- II Evolving structural architecture and fluid flow
- III Thermal regime
- 11 Introduction to the thermal regimes of thrustbelts
- 12 Role of pre-orogenic heat flow in subsequent thermal regimes
- 13 Role of structural and stratigraphic architecture in thermal regimes
- 14 Role of syn-orogenic burial and/or uplift and erosion in thermal regimes
- 15 Role of deformation in thermal regimes
- 16 Role of fluid movement in thermal regimes
- IV Petroleum systems
- References
- Index
Summary
The role of deformation on the thermal regime in thrustbelts can be divided into three areas of control:
the velocity at which different thrust sheets are emplaced on top of each other, which controls the rate at which their thermal regimes affect each other;
the heating provided by the internal deformation of the thrust sheet material; and
the heating provided by the friction along the décollement and major thrust faults.
Role of the shortening rate
Shortening brings a hanging wall from depth to rest on top of the footwall, causing warming of the footwall by increased burial and cooling of the hanging wall by placing it into a cooler thermal regime. This concept can be illustrated by petrological data from footwall rocks, which reflect pressure and temperature increase during thrusting, and from hanging wall rocks, which record retrograde reactions (Karabinos, 1984a, b; Chamberlain and Zeitler, 1986; Trzcienski, 1986).
In order to discuss the effect of the velocity at which different thrust sheets are emplaced on top of each other, a set of finite-element models has been designed for various types of thrustbelt structures (Henk and Nemčok, 2000). Because the report in which the results have been described has restricted circulation, they will be discussed here in detail.
Because the shortening rate affects the duration of the heat transfer between thrust sheets moving on top of each other, it is extremely important to understand which rates are realistic for natural cases.While a rate of centimetres per year is appropriate for plate movements, typical shortening rates for local structures in active thrustbelts are in millimetres per year (Table 9.3a).
- Type
- Chapter
- Information
- ThrustbeltsStructural Architecture, Thermal Regimes and Petroleum Systems, pp. 315 - 346Publisher: Cambridge University PressPrint publication year: 2005