AGI Data Sheets: For Geology in the Field Laboratory and by J. Thomas Dutro Jr., Richard Vincent Dietrich, Richard M.

By J. Thomas Dutro Jr., Richard Vincent Dietrich, Richard M. Foose

One of many best-kept secrets and techniques in geology is that this convenient compilation of geological details. even if pocket-sized, this spiral-bound and easy-to-read ebook deals an excessive amount of helpful info equivalent to geologic map symbols, actual standards graphs and charts, projection nets, checklists, and data on approximately a hundred themes. excellent for speedy reference within the box, lab, and workplace.

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Also high grade metamorphic rocks. Fe-rich varieties found in metamorphic iron formations. Commonly associated with clinopyroxene. 4 Prismatic habit and cleavage at - 56° and 124°; dark color ; crystals elongate. sometimes fibrous Augite has similar colors but different cleavage angles. Other amphiboles, especially actinolite, may resemble hornblende. Igneous and metamorphic rocks. Widely distributed. ); green color Hornblende is usually darker colored. Metamorphic rocks; characteristic of greenschist facies metamorphism.

Filled with minerals deposited by. lor example, ground water or hydrothermal solutions - and now are veins. In the field, the strikes and dips of joints are usually recorded. For reports, the orientations of joints are often shown on maps and/or diagrams. , there has been displacement of the blocks parallel to the fracture. Although some fault zones have essentially vertical or horizontal dips, most do not. Figures 1 and 2 illustrate typical fault orientations. For example, based on the relative movements of their two blocks, normal faults (Figure 2A) are those whose hanging-walt blocks have moved downward with respect to their footwall blocks.

John Wiley and Sons, New York, 596 p. I. DARK COLORED A. 8. Crystal System )> Color Luster Hardness Specific Gravity c Diagnostic Features Similar Species Micaceous cleavage; dark color; elastic folia Phlogopite is general· ly lighter colored; chlorite is inelastic Micaceous cleavage, green color; inelastic folia Biotite is elastic Metamorphic rocks (diagnostic mineral of greenschist facies); igneous as alteration product. Pistachio green color; one perfect cleavage Complete series between epidote (AI: Fe +3 2:1) and clinozoisite (3:0), which is lighter colored Metamorphic rocks (found commonly with actinolite, albite, and chlorite in greenschists); igneous as alteration product.

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