Flow Texture

flow texture

[′flō ‚teks·chər]
(petrology)
A pattern of an igneous rock that is formed when the stream or flow lines of a once-molten material have a subparallel arrangement of prismatic or tabular cyrstals or microlites. Also known as fluidal texture.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Flow Texture

 

the texture of igneous rocks in which the crystals of the rock or the microlites of the groundmass that surround the phenocrysts are oriented along the flow lines of the once molten rock. Flow texture is formed during the movement of viscous solidifying lava. It is characteristic of extrusive rocks, such as trachytes, rhyolites, and obsidian, and of hypocrystalline rocks, such as gabbros and nepheline syenites.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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As illustrate in figure (6), you see Shard flow texture in tuffs (as ignimbrites) and Fracture in nummulites, respectively.
Using models and the latest elevation maps of Ceberus Fossae, the researchers concentrated on the velocity and depth of the flow textures seen as the material cut around boulders and washed up on slopes, Discovery News reported.
Flow textures in some of the drill cores support this idea, Fryer says.