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| Description: Intrusive Igneous Activity Most magma is emplaced at depth An underground igneous body is called a pluton Plutons are classified according to Shape Tabular (sheet-like) Massive Plutons are classified according to Orientation with respect to the host (surrounding) rock Discordant – cuts across existing structures Concordant – parallel to features such as sedimentary strata Types of igneous intrusive features Dike, a tabular, discordant pluton Sill, a tabular, concordant pluton e.g., Palisades Sill, NY Resemble buried lava flows May exhibit columnar joints Laccolith Similar to a sill Picture Stats: Views: 268 Filesize: 2.89MB Height: 922 Width: 1416 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39616 |