Tectonic breccia ("Italian Red Antique Marble") (Genoa, Liguria, Italy) : 無料・フリー素材/写真
Tectonic breccia ("Italian Red Antique Marble") (Genoa, Liguria, Italy) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Tectonic breccia from the Apenine Mountains of Italy. (cut & polished surface)Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.Tectonic breccias form by intense crushing of bedrock in or near fault zones. They may or may not have additional features, such as veining, serpentinization, chloritization, etc. These rocks consist of large angular pieces surrounded by a fine-grained matrix or finely-crystalline cement.The tectonic breccia shown above is a decorative stone known as "Italian Red Antique Marble" in the retail trade. This rock consists of reddish marble clasts with some white calcite veining and minor serpentinization (= greenish areas).Locality: Genoa, Liguria Province, Apenine Mountains, northwestern Italy. |
| 撮影日 | 2015-04-02 21:43:45 |
| 撮影者 | James St. John |
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