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Unformatted text preview: Outline 2 1/22/02 Geosynclines - Areas of thick , deformed , sedimentary rocks, usually in mountains . Features - v. thick sediments (2,000 ~ 16,000 m) - moderate-to-severe folding (&#2; compression &#2; ) - thrust faults (&#2; compression &#2; ) - mountain-building (deep roots, high surface) - (regional) metamorphism - granitic intrusions (batholiths) - clastic wedges (as mtns. erode) occur usually between a continent and an ocean parts - Miogeosyncline (near cont.) + Eugeosyncline (near ocean) history - Geosyncline Cycle (200-600 mill. yrs.) Depositional Part &#2; Terminal Orogeny &#2; Erosional Part form thick deformation, erode mountains sediments form mtns. assembly? - all parts of a geosyncline might not form together Cause for geosyncline features + history - ?? Where are present-day geosynclines? really old (Precambrian) geosynclines? (shields??) Do continents grow through time? (add geosynclines?) Continent Geosyncline (Mtns.) Geosyncline (Mtns....
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- Spring '08