Earth Sciences 1022A/B Lecture Notes - Lecture 6: Depositional Environment, Magnesium, Lithification
27 Apr 2019
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Weathering + erosion 2. sediment 3. transported 4. deposited. Residual sedimentary particles from weathered rock and soil can be dislodged (eroded) and transported away from their source area by: A depositional environment is a geographic setting where sediment accumulates (stored). Wide variety of depositional settings + environmental conditions controls accumulated sediment types. As transport energy decreases, larger/heavier clasts are deposited (dropped) first. The more distance that clasts travel, the more rounded & more sorted they become. General rule: smaller/lighter sediments are deposited in lower-energy environments than larger/heavier particles when transported by wind or water (ice or glaciers are an exception). Leads to sorting of sediment based on particle size (mass). In contrast, sediment transported short distances and/or deposited rapidly tend be poorly sorted. The more transporting or reworking that occurs, the clasts become more rounded (less angular). The depositional environment can be recorded" or preserved in the form of sedimentary rock structures; how sediment was deposited.
