File:Tremolite schist (Upper Marble, Grenville Series, Mesoproterozoic, 1.15-1.30 Ga; Balmat, Adirondack Lowlands, New York State, USA) (16921690192).jpg
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[edit]DescriptionTremolite schist (Upper Marble, Grenville Series, Mesoproterozoic, 1.15-1.30 Ga; Balmat, Adirondack Lowlands, New York State, USA) (16921690192).jpg |
Tremolite schist from the Precambrian of New York State, USA. (7.5 centimeters across at its widest) 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. Schist is an intermediate- to high-grade, foliated metamorphic rock. It is highly variable in appearance, depending on the mineral content, which is a function of the precursor rock and specific temperature-pressure conditions. Garden-variety schists form by metamorphism of phyllites. Schists typically have medium- to large-sized crystals, unlike the microcrystalline nature of slate & phyllite. Schist's foliated texture (= crystals aligned into bands or stripes or layers) is often only seen when specimens are viewed on edge. Tremolite schist is a ~monomineralic, foliated metamorphic rock composed of tightly interlocking tremolite crystals. Tremolite is a whitish amphibole (Ca2Mg5Si8O22(OH)2) that forms small, acicular (needle-shaped) crystals. The sample shown above comes from near Balmat in New York State, USA. At this locality, tremolite schist is closely associated with talc schists and talc-tremolite schists. Stratigraphy: Upper Marble, Grenville Series, Mesoproterozoic, 1.15-1.30 Ga Locality: Balmat area, Balmat-Edwards Mining District, southwestern St. Lawrence County, Adirondack Lowlands, northern New York State, USA |
Date | |
Source | Tremolite schist (Upper Marble, Grenville Series, Mesoproterozoic, 1.15-1.30 Ga; Balmat, Adirondack Lowlands, New York State, USA) |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/16921690192. It was reviewed on 2 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 December 2019
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current | 06:23, 2 December 2019 | ![]() | 1,493 × 967 (1.96 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Pixel composition | RGB |
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Orientation | Normal |
Horizontal resolution | 500 dpi |
Vertical resolution | 500 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 23:29, 24 March 2015 |
Color space | Uncalibrated |
Image width | 1,493 px |
Image height | 967 px |
Date and time of digitizing | 19:27, 24 March 2015 |
Date metadata was last modified | 19:29, 24 March 2015 |