Skip to main content

Metamorphic Pressure - Temperature - Time Paths

Metamorphic Pressure - Temperature - Time Paths

Frank S. Spear (Editor), Simon M. Peacock (Editor)

ISBN: 978-1-118-66748-4

Mar 2013, American Geophysical Union

102 pages

Select type: O-Book


Published by the American Geophysical Union as part of the Short Courses in Geology Series, Volume 7.

A renaissance in the study of metamorphic rocks has occurred in the past decade. For a long time (with some notable exceptions) metamorphic rocks were studied as examples of heterogeneous systems at equilibrium and the study of metamorphism was, in effect, a phase equilibria experiment. A major goal of metamorphic petrology was to pigeonhole the types of mineral assemblages encountered into the appropriate metamorphic facies. Indeed, even geothemobarometry, in all its sophistication, is nothing but a quantitative form of pigeonholing. However, all of this has changed recently and today, metamorphic rocks are studied in large part as a means to unravel major tectonic problems during orogenesis.

Preface vii

1 Petrologic Determination of Metamorphic Pressure-Temperature-Time Paths 1

Introduction 1

Thermodynamics of Heterogeneous Systems 2

Calculation of Metamorphic Phase Equilibria 6

Petrogenetic Grids 8

Geothermometry and Geobarometry 9

Bibliography of Geothermobarometers1 1

Application of Thermobarometry: Procedureas an d Potential Pitfalls 16

Inferring a Metamorphic P-T Path 25

Thermobarometroyn Inclusion Suites 25

Differential Thermodynamics: Theroretical Considerations2 5

Differential Thermodynamics: Applications 30

A Worked Example: Fall Mountain, New Hampshire, USA 43

Concluding Remarks 49

Acknowledgments 50

References 50

2 Thermal Modeling of Metamorphic Pressure-Temperature-Time Paths

Introduction 57

Heat Transfer--Equations and Solutions 59

Numerical Examples 69

Literature Review 79

Regional Metamorphism 80

Contact Metamorphism 88

Subduction Zone Metamorphism 90

Appendix 98

References 99