GEOB 103 Chapter Notes - Chapter 12: Proglacial Lake, Elevation, Coast Mountains
9 Apr 2016
School
Department
Course
Professor
Document Summary
Tectonic processes: plate movement, uplift, erosion: convergent margins (ph 12. 1, ph 12. 2, divergent margins (ph 12. 3) Mean topographic elevation (see fig 1. 4!: crust thickness, crust density, isostatic compensation . Thermal uplift: density changes with rock temperature. Transform margins (ph 12. 4) no uplift, but lateral displacement. T: tectonic driven uplift, i: isostatic compensation to erosion. Result: erosion of 100cm of surface rock results in around 82cm of isostatic compensation (rock uplifted by 82cm) assumes no tectonic or thermal uplift occurs. Surface elevation is also affected by flexure of crust (fig 12. 2) Coasts: eg. loading by glacier, proglacial lake, sediment deposition effects spatially distribution. Convergent margins (ut: folding, thrust faults goes up, thickness of crust, building a crustal root (eg. fig 12. 2m bottom) Evolution of a mountain range fig 12,3. Movement of hot rocks to surface @ rift zones, spreading ridges (ge east. Effect decays with distance from ridge/riff, as rocks cool. Can occur @ subduction zones eg. coast mountains & exposed.
