WebDec 10, 2024 · answered • expert verified. The very large crystals of quartz, feldspar, and muscovite found in pegmatites form from ________. Select one: A. the middle crystallizing parts of a magma. B. the final crystallizing parts of a magma. C. the early crystallizing parts of a magma. D. all of the above. Advertisement. http://geologyscience.com/rocks/pegmatite/
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WebPegmatites are very coarse grained felsic rocks that occur as dikes or pod-like segregations both within granitic plutons and intruded into the surrounding country rock. They appear to form during the late stages of crystallization which leaves H 2 O-rich fluids that readily dissolve high concentrations of alkalies and silica. Webof igneous rocks, [00:03:30] they don't form crystals that are very large. Only pegmatites do. Maggy Benson: What makes pegmatites unique in their formation? Mike Wise: Well, they're unique in their formation in that they are able to concentrate a lot of rare elements. A lot of elements that don't occur in large quantities in most igneous rocks. smoothie tacoma
Pegmatite Definition & Meaning Dictionary.com
WebApr 12, 2024 · what: The major reason why pegmatites are predominantly hosted by amphibolite is the brittle to semi-brittle behavior of amphibolite producing local stress minima toward which fluids and melts migrated. how: The authors used a different sample than Mu00fcller et_al for dating of the Tangen pegmatite to test the robustness of the U … WebApr 9, 2024 · Pegmatites produce from waters that isolate from magma in the late stages of crystallization; this activity commonly takes place in small pockets beside the margins of … WebPegmatites form from waters that separate from a magma in the late stages of crystallization; this activity often occurs in small pockets along the margins of a batholith. Pegmatite can also form in fractures that develop on the margins of the batholith. This is … Extrusive igneous rocks erupt onto the surface, where they cool quickly to form … smoothies with veggies and fruit