ENVS 2160 Lecture Notes - Lecture 24: Carbon Cycle, Glaciology, Sturtian Glaciation
22 Jun 2016
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Document Summary
**supercontinents appear to be associated with the major glaciations tectonics can have some effect on climate, but not the sole reason** Physical, chemical and biological properties of sedimentary rocks: consolidation of glacial deposits into rocks. Terrestrial deposits very rare most likely eroded. Deposits are subject to geological process over time: tectonic uplift and erosion/weathering, tectonic deformation, landslides and deformation. Like other rocks, some sections of time are missing. Diamictite rock form of diamict: poorly sorted mixture of sand, silt, clay and gravel. Laminated mudds with isolated outside pebbles or clusters of pebbles (dropstones from ice-rafted debris) **but none of these are unique to glacial environments can use them to say the most plausible explanation, but cannot say 100%*: diamictite. Always need to consider alternative explanations and reason to the most plausible explanation: early proterozoic glaciation. Exposed in canada and the u. s. (figure young and nesbitt, 1985)
