Dougal Jerram - The Field Description of Metamorphic Rocks

...Figure 4.5 Boudinage / pinch and swell. (a) Pinch and swell structures in a ...Figure 4.6 Cm‐scale, garnet‐rich reaction selvages (pink) formed at the inte ...Figure 4.7 Examples of sharp versus graded banding. (a) Gradational and shar ...Figure 4.8 Sigma 1 and fabric formation schematic. (a–a1) Grain/object defor ...Figure 4.9 Schematic of simple fabric symmetry types. Figure 4.10 Alpine rock with oriented mineral patches. Annotations highlight ...Figure 4.11 Examples of cleavage types. (a) Slate quarry, Penn Big bed, Slat ...Figure 4.12 Example of schistosity as highlighted by crenulated shiny micas, ...Figure 4.13 Example of a phyllite, NW Scotland. Figure 4.14 Outline of lineation cleavage relationships. (a) Bedding/cleavag ...Figure 4.15 Examples of crenulation cleavage. (a) Well‐preserved ripples in ...Figure 4.16 Gneisses and migmatites: (a) mm to cm‐scale irregular and folded ...Figure 4.17 (a) Large, planar segregations in a migmatite, Montana, USA. (b) ...Figure 4.18 Refraction, kinking, and shearing. Top: (a) Refraction, showing ...Figure 4.19 Example of cleavage refraction in metasediments, Namibia Figure 4.20 Kinked foliation, Boscastle, Cornwall (photo width ~1.5 m) Figure 4.21 (a) Fold and cleavage relationships in three dimensions. (b) Exa ...Figure 4.22 Fabric/fold relationships on profile sections. Thin lines repres ...

5 Chapter 5Figure 5.1 Field sketches of textures from which the sequence of mineral gro ...Figure 5.2 Sketches of textures that show relationships between metamorphic ...Figure 5.3 Garnet porphyroblasts (orange) and pseudomorphs after lawsonite ( ...Figure 5.4 Examples of porphyroblasts. (a) Kyanite‐garnet paragneiss from th ...Figure 5.5 Example of an augen gneiss, Brazil Figure 5.6 Flaser fabric in a quartz, feldspar, and biotite‐rich gneiss from ...Figure 5.7 Sketches of early metamorphic (or inherited) crystals that can re ...Figure 5.8 Examples of rotated augen (a) and (b) sheared feldspar porphyrocl ...Figure 5.9 Schematic of different stages of fabric development in relation t ...Figure 5.10 Rotated inclusions in garnet compared to matrix. Example shows q ...Figure 5.11 Pseudomorphs. (a) Sketch showing development from original miner ...Figure 5.12 Gabbroic texture overgrown by green metamorphic pyroxene, Syros, ...Figure 5.13 Examples of pseudomorphs. (a) Pseudomorphs after lawsonite Syros ...Figure 5.14 Examples of mafic pods. (a) Zoomed‐in Greenland pod (photo; see ...Figure 5.15 Boudins and shear pods. (a) Formation of boudins (b) Boudins ...Figure 5.16 A knocker of mafic eclogite, Syros, Greece. The eclogite was onc ...Figure 5.17 Examples of mafic pods and mafic layers within the Lewisian comp ...

6 Chapter 6Figure 6.1 Examples of intrusions within a metamorphic context. (a) Complex ...Figure 6.2 (a) Example of an aureole beneath a large ponded lava flow on top ...Figure 6.3 Examples of hornfels. (a) Cordierite porphyroblasts in a calc sch ...Figure 6.4 Examples of melting at contacts. (a) Pitted sandstone contact aga ...Figure 6.5 Subtle effected aureoles around a picritic dyke in Namibia. The z ...Figure 6.6 Simplified map of Ross of Mull contact metamorphic zones found ar ...Figure 6.7 Examples of metamorphic textures from the Ross of Mull aureole, S ...Figure 6.8 Complex metasomatic zones around the edges of multiple dyke sheet ...Figure 6.9 C ompositional banding (bedding) where quartz veins are more stron ...Figure 6.10 En‐echelon veins/tension gashes rotated during a progressive she ...Figure 6.11 Conjugate en‐echelon tension gashes in Old Red Sandstone. Marloe ...Figure 6.12 Vein patterns, shapes, and elements. (a) Extensional veins perpe ...Figure 6.13 (a) Tremolite and chlorite growing into a vein, Syros, Greece. ( ...Figure 6.14 Deformation of vein structures. (a) Folded veins cross‐cut by la ...Figure 6.15 Reaction at wall of vein in a garnet blueschist, Syros, Greece ...Figure 6.16 Examples of reaction zones and contacts. (a) Pegmatitic vein par ...Figure 6.17 Exceptional mm scale mineral reaction zones of (centre out) orth ...

7 Chapter 7Figure 7.1 The classic major faults and terrains of Scotland, including the ...Figure 7.2 Schematic to highlight changes from ductile to brittle behaviour ...Figure 7.3 Quartz slickenfibres with congruous steps in quartzite, indicatin ...Figure 7.4 Schematic to show how steps on slickenside surface can be interpr ...Figure 7.5 Epidote formation along an E–W cataclastic fault zone within a Pa ...Figure 7.6 (a) Crackle to mosaic breccia of Silurian mudstone with calcite c ...Figure 7.7 Cataclasite examples. (a) Brecciated greywacke with thin sub‐hori ...Figure 7.8 Thin layer of pseudotachylite with apophyses (glassy black materi ...Figure 7.9 Diagrammatic representation of the plane of orientation to look f ...Figure 7.10 Examples of shear indicators. (a) Sinistral shear in Moint Trust ...Figure 7.11 Notebook sketch examples of shear indicators Figure 7.12 Examples of sheath folds, Assynt, Scotland. Umbrella in (b) and ...

8 Chapter 8Figure 8.1 Examples of a detailed field sketch being neatly drawn up in a gr ...Figure 8.2 Using the data from your notebook. Here, the orientations of 180 ...Figure 8.3 Using overlays/sketches and linked photos in a figure for a repor ...

1 Cover Page

2 Series Page The Geological Field Guide Series Field Hydrogeology, Fourth edition Rick Brassington Drawing Geological Structures Jörn H. Kruhl Field Hydrogeology, Third edition Rick Brassington Basic Geological Mapping, Fifth edition Richard J. Lisle, Peter Brabham, and John W. Barnes The Field Description of Igneous Rocks, Second edition Dougal Jerram and Nick Petford Sedimentary Rocks in the Field, Fourth edition Maurice E. Tucker Field Geophysics, Fourth edition John Milsom and Asger Eriksen Field Geophysics, Third edition John Milsom

3 Title Page The Field Description of Metamorphic Rocks SECOND EDITION Dougal Jerram Centre for Earth Evolution & Dynamics, University of Oslo, Norway DougalEARTH Ltd, Solihull, UK Mark Caddick Virginia Tech Blacksburg, VA, USA

4 Copyright Page

5 PREFACE – THE FIELD DESCRIPTION OF METAMORPHIC ROCKS

6 ACKNOWLEDGMENTS

7 Table of Contents

8 Begin Reading

9 FURTHER READING SUGGESTIONS

10 Index

11 WILEY END USER LICENSE AGREEMENT

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