The Field Description of Metamorphic Rocks. Dougal Jerram

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СКАЧАТЬ href="#u7e6dcf98-6f3b-506f-a2b3-6199597d3c80">Chapters 2 and 3 provide advice and information on some of the key field skills and metamorphic outcrop description (Chapter 2), as well the main classification criteria (Chapter 3). Chapters 4 and 5 focus in more detail at key structures in metamorphic rocks such as cleavage, shistosity, and isolated bodies such as boudains, augen, and sheared entities. Chapter 6 looks at contacts with igneous rocks, veins, and reaction zones. Chapter 7 looks at the structural control of faults and fault zones in metamorphic rocks and shear zones including shear sense indicators. In Chapter 8, there are key tables and details for reference by way of a summary, as well as some advice for those who are undertaking a more detailed mapping dissertation or project.

Figure 1.9 Summary of the two main types of tectonic settings with an outline of the metamorphic grades

       (Source: partly redrawn from Hefferan and O'Brien (2010)).

       The metamorphic grades: Very Low Grade VLG, Low Grade LG, Medium Grade MG/MG2, High Grade HG/HG2 and Very High Grade VHG, are indicated on panels (a) and (b) (also refer to Table 3.1 and Chapters 3 and 8)

       (Source: Rock picture inserts from the figures in this chapter).

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