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graywacke |
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graywackeor dirty sandstoneSedimentary rock composed of sand-sized grains in a fine-grained clay matrix. The sand-sized grains frequently include rock fragments of wide-ranging mineralogies (e.g., pyroxenes, amphiboles, feldspars, and quartz). The clay matrix may constitute up to 50% of the volume. Of the clay minerals, chlorite and biotite are most abundant. The matrix tends to bind the grains strongly and form a relatively hard rock. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The supracrustal (greenstone) belts are lithologically diverse and include basalt, greywacke, pelite, and iron formation, along with lesser andesite, dacite, rhyolite, ultramafic rocks, conglomerate, and carbonate rocks. And beneath the Greywacke Arch, a street musician was playing plaintive standards on his alto saxophone, lending the sense of a Woody Allen soundtrack to the day. Suture zones are characterized by regionally extensive belts of greywacke flysch deposited early during the collisional process and subsequently deformed and metamorphosed during continued convergence. |
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