WebChapter 3 Summary. The topics covered in this chapter can be summarized as follows: 3.1. The Rock Cycle. The three types of rocks are igneous, formed from magma; sedimentary, formed from fragments of other rocks or precipitations from solution; and metamorphic, formed when existing rocks are altered by heat, pressure, and/or chemical action. 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, …

Igneous intrusion - Wikipedia

WebApr 1, 1989 · When hot magma contacts cold solid rock, a chilled margin forms because the heat flux from the magma cannot balance the very large initial … 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. cube root of 2889

Unit 2 Module 2: Differences between sills and lava flows - Quizlet

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 … WebExplain the origin of a chilled margin; Figure 3.1 A fine-grained mafic dyke (dark green) intruded into a felsic dyke (pink) and into coarse diorite (grey), Quadra Island, B.C. All of these rocks are composed of more than one type of mineral. The mineral components are clearly visible in the diorite, but not in the other two rock types. WebThe temperature difference between the two leads to the edges of the intrusion to be rapidly cooled, and therefore develop a chilled margin. The cooler country rock is heated at the … east coast furnitech