A chilled margin is a shallow intrusive or volcanic rock texture characterised by a glassy or fine-grained zone along the margin where the magma or lava has contacted air, water, or particularly much cooler rock. This is caused by rapid crystallization of the melt near the contact with the surrounding low temperature environment. In an intrusive case, the crystallized chilled margin may decrease in size or disappear by later remelting during magma flow, depending on magma heat … WebAnother common feature of pillows are chilled margins. This is very fine-grained or glassy outer part of the pillow which cooled very rapidly in cold seawater. This material is called tachylyte. Some of the pillows below show radial cracks and some have chilled margins, which may be altered to palagonite. Pillow lava in Cyprus is very common.
Martin SHARPE Mede-Professor Doctor of Philosophy
WebThe chilled margin is much finer grained than most of the intrusion, and may be different in composition, reflecting the initial composition of the intrusion before fractional crystallization, assimilation of country rock, or further magmatic injections modified the composition of the rest of the intrusion. [42] WebA chilled margin is a shallow intrusive or volcanic rock texture characterised by a glassy or fine-grained zone along the margin where the magma or lava has contacted air, water, … how much is that hamburger
(PDF) Magma hybridization, mingling, and recycling in
WebOnly 1 clear chilled margin below while the top may be chilled or made of scoria. Scoria a glassy, mafic, igneous rock containing abundant air-filled holes How many baked … WebThe principle of chilled margins states that the portion of an intrusion that has cooled and crystallized next to cold surrounding rock will form smaller crystals than the portion of the intrusion that cooled more slowly deeper in the instrusion, which will form larger crystals. WebChilled margin from a pillow lava rim. The pillow margin quenched to glass, enclosing euhedral phenocrysts. The more slowly-cooled interior first grew spherulites, which … how do i get a bcin number in ontario