ESCI 401 Lecture Notes - Lecture 9: Subsidence, Curie Temperature, Thermoremanent Magnetization

• School: UNH
• Department: Earth Sciences
• Course: ESCI 401
• Professor: Boettcher, Margaret S.

Document Summary

Metamorphic under pressure) or precipitation from solution. Weathering and erosion of rocks exposed at surface. Form through deposition, burial and lithification (sediments compacting. Metamorphic can turn into a different form on it"s own rock type mantle. Earth"s magnetic field flips in normal and reverse polarities. (trm) igneous rocks cool below curie point (about 580*c), obtaining whatever earth"s magnetic field direction is at the time of cooling, and locks the direction in. As fast as fingernails grow: about 30 mm/yr. Can be used to calculate how fast the ocean floor is spreading. Youngest near the center of the seafloor. Symmetrical on both sides of mid-ocean ridges. Some are wider than others because some are spreading faster than others a. Burial and heating (high pressures and temperatures) b. Erosion, deposition and lithification ii. iii: when two plates pull apart, the land is exposed and the sediments begin to, sediment sedimentary rocks erode. this causes them to form sedimentary rocks.