Study the photographs attached. Each photograph has a diamicton unit that is lab
ID: 295765 • Letter: S
Question
Study the photographs attached. Each photograph has a diamicton unit that is labelled (4A, 4B, etc.). For each:(a) Describe the diamicton as thoroughly as possible, on the basis of what you can see in the photograph. Do not include details which are not visible in the photograph. (b) Aside from clast fabric, name one other parameter that would be the most useful in helping to investigate the origin of the unit. (c) On the basis of the evidence available to you, which of these diamictons could be considered as tills (maximum 2 paragraphs for each diamicton)? iPad? * 96%- 10:09 PM ? onine.rmun.ca c) on the basis of the evidence available to you, which of these diamictons could be considered as tills? (max 2 paragraphs for cton) 2 of 7 4 A. Wristwatch for scale. Describe only diamicton "A" (with wristwatch): do not describe the underlying gravel unit.
Explanation / Answer
A.The rock consist of large boulder sized rock fragments dark in colour, terrigeneous derived in a fine grained sand sized matrix.There are some angular rock fragments suggesting lesser transportation and some fragments well rounded so it may be regarded as a till deposit due to poor sorting and poor textural maturity
B.This rock also consist of gravel sized particles to pebble embedded in fine grained muddy matrix.The clast show well rounded clasts to sub angular to angular clast.The clast are of quatrz,maic rock fragments,feldspar etc.This rock is also showing features of glacial origin due to its poor sorting and lack of textural maturity.
C.The rock contains white rock or mineral fragments, angular in shape, coarse grained gravel to boulder sized clasts. The mineral framents may be of feldsper or sedimentary rock fragments.The matrix is fine grained sandy.The rock may be of glacial origin due to high angularity,poor sorting and fine sandy to muddy matrix.
D.The rock shows a dark coloured clast probably of the same material as the matrix, may be intraformational.although the matrix is fine grained and the clast is of boulder sized.The rock might not be of glacial origin.
E.The rock consist of mainly anglar to sob angular clast with polished surface,un decomposed feldspar clast and clasts of rockfragments.This is a typical example of unconsolidated,non lithified till deposits.The rock also hows deformational sructures (minor folding).
F.This rock also shows clast of boulder sized along with relatively fine clasts and fine sandy matrix.The clast are subangular,polished, may be of undecomposed feldsper or quartz grains and rock fragments.The low textural maturity , high vaiation in grain size suggest a glacial origin for this rock.