Click each image to examine the rock's texture and infer its cooling rate and environment. Other Characteristics: vesicular like pumice, but denser and darker with larger vesicles. GABBRO BASALT DIORITE ANDESITE (PORPHYRY) GRANITE RHYOLITE PUMICE OBS ID AN Cooling History/Texture Slow Cooling and Coarse Grained Fast Cooling and Fine Grained Very Fast Cooling and Glassy/Cellular Mafic and Dark Color Felsic Origin: Extrusive/Volcanic. Differences - in grain size and cooling rate. This slow cooling gives a large grain size. Diorite is plutonic and andesite is volcanic. Lavas that cool extremely rapidly may have a glassy texture. — They formed differently 10. — One forms from cooling magma, and one forms from cooling lava. As magma cools, it begins to crystallise and form solid rock. Identify the cooling rate (fast, slow, or two-staged) and cooling environment (magma chamber, eruption from volcano, or deep cooling followed by eruption) of the rock in each image. However, additions of soot also caused the temperature at maximum cooling to decrease. Cooling Rate: rapid, extrusive. 16. Grain Size & Cooling Rate. Which rock is sedimentary in origin and formed as a result of chemical processes? The video below is a clip of crystals forming in solution. The higher the rate of cooling the smaller the size of the crystals. Intrusive Equivalent: diorite or gabbro. Tectonic Environment: Divergent Boundary or Intra-oceanic hot spots Diorite is slowly crystallized inside the earth. Mineral Composition: Predominantly Glass. This rapid cooling provides a rock with small crystals. Igneous Rock Textures and Cooling Rates ! Crystals in magma grow in a similar way as the melt cools. Cooling rate and gas content create other textures (see Figure below for examples of different textures). 3. ... Diorite was used extensively by ancient civilizations for vases and other decorative artwork and is still used for art today (Figure below). Igneous rocks are made up of several different mineral crystals that grow within the melt as it cools. Phaneritic: coarse grain, individual crystals are visible - slow cooling. What is the origin and rate of formation of this rock? The same magma on Andesite and Diorite rapidly crystallizes on the Earth's surface and forms Andesite. This probably is due to the very fine soot particles functioning as nucleation sites for bubble formation during nucleate boiling. Diorite produced coarse grain sizes from slow cooling. ... very rapid cooling slow cooling slow followed by rapid cooling none of the above. The rate of cooling is proportional to the difference in temperature between the bodies in contact with heat flowing from the warmer body to the cooler body. (1) plutonic with slow cooling (2) plutonic with rapid cooling (3) volcanic with slow cooling (4) volcanic with rapid cooling . — They cooled at different rates. The differences between Andesite and Diorite are in their grain size and their cooling rate. granite diorite gabbro. Andesite forms when magma quickly crystallizes on the surface of the earth. The rate of cooling of a magma or lava is reflected by the _____ of the rock. The maximum cooling rate increases as the amount of soot increases in the quench oil. The proposed semi-empirical cooling rate correlation was valid for GMR and temperature values ranging from 1.3 to 8.3 and 293 K to 571 K, respectively [40]. Diorite slowly crystallized inside the Earth. — They have different grain sizes or textures. — One is extrusive and one is intrusive. Which is more likely, a granite dike, a diorite dike or a gabbro dike? 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