EARTHSC 4G03 Study Guide - Final Guide: Mass Balance, Hydrogeology, Fjord
7 Jan 2017
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Difference b/w till and diamict can"t call something till just because it"s poorly sorted, diamict is default for glaciologists, al tills are diamicts, not all diamicts are tills. Explain subglacial traction till, melt-out till, and glacitectonite (type a and b) from paper. Why chance classification system stop defining things by processes when you don"t fully understand the process that formed them. Draw log at certain spot if glacier is receding: Glacier edge mostly deltaic (slumping, glacial till, deformation below below), then fining upwards when more in water, faulting, turbidites. Within glacial lake finer sediments deposited laminarly (varves if seasonal, rhythmites if just rhythmic) Think of glacier"s position in relation to core positions. Pebbles within silts/clays gives evidence of glaciolacustrine, not just lake. Compare and contrast sedimentation of ice-contact and non-ice-contact lakes. Compare and contrast glaciolacustrine diamict and lodgement till. Supraglacial could be run over by glacier again though! Subglacial environments get lodgement and deformation tills.
