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@article{1390071,
author = {Křížek, Marek and Krbcová, Klára and Mida, Peter and Hanáček, Martin},
article_location = {Amsterdam},
article_number = {August},
doi = {http://dx.doi.org/10.1016/j.sedgeo.2017.06.010},
keywords = {Micromorphology; Microtextures; Glaciofluvial environment; Fluvial transport; Svalbard},
language = {eng},
issn = {0037-0738},
journal = {Sedimentary Geology},
title = {Micromorphological changes as an indicator of the transition from glacial to glaciofluvial quartz grains: Evidence from Svalbard},
url = {http://www.sciencedirect.com/science/article/pii/S003707381730146X?via%3Dihub},
volume = {358},
year = {2017}
}
TY - JOUR
ID - 1390071
AU - Křížek, Marek - Krbcová, Klára - Mida, Peter - Hanáček, Martin
PY - 2017
TI - Micromorphological changes as an indicator of the transition from glacial to glaciofluvial quartz grains: Evidence from Svalbard
JF - Sedimentary Geology
VL - 358
IS - August
SP - 35-43
EP - 35-43
PB - Elsevier Science
SN - 00370738
KW - Micromorphology
KW - Microtextures
KW - Glaciofluvial environment
KW - Fluvial transport
KW - Svalbard
UR - http://www.sciencedirect.com/science/article/pii/S003707381730146X?via%3Dihub
L2 - http://www.sciencedirect.com/science/article/pii/S003707381730146X?via%3Dihub
N2 - The micromorphology of quartz grains in a sedimentary environment is determined by the transport mechanism and the nature of weathering. Both these aspects change during the transport history of grains. Thus important questions include how are quartz grains affected by possible changes in the transport medium, and how quickly do the different micromorphological features develop or disappear. The main goal of this study was to characterize the changes in the micromorphological features of quartz grains during the transition from a glacial to a glaciofluvial environment, and to identify a set of diagnostic microtextures that can be used to distinguish between glacial and glaciofluvial quartz grains. The samples came from the moraines of the Bertilbreen and Hřrbyebreen glaciers (Svalbard) and from the sediments of glacier-fed rivers in the forelands of these glaciers. A total of 30 different micromorphological features was observed on 800 different quartz grains from13 samples of glaciofluvial sediment and 3 samples of glacial sediment. Itwas found that the frequency of rounded grains, Vshaped pits, meandering ridges and cemented microblocks on glaciofluvial grains increased significantly with increasing length of fluvial transport, whereas the frequency of angular grains, straight steps, straight and curved grooves, adhering particles, pitting and oriented etch pits decreased significantly. Different types of micromorphological features of quartz grains change with fluvial transport at different rates. Adhering particles (after the first kilometer of fluvial transport), straight steps and meandering ridges (after the second kilometer of fluvial transport), and V-shape pits, angular shape and straight grooves (after the third kilometer of fluvial transport) are reliable mechanical micromorphological features for distinguishing between glacial and glaciofluvial quartz grains.
ER -
KŘÍŽEK, Marek, Klára KRBCOVÁ, Peter MIDA a Martin HANÁČEK. Micromorphological changes as an indicator of the transition from glacial to glaciofluvial quartz grains: Evidence from Svalbard. \textit{Sedimentary Geology}. Amsterdam: Elsevier Science, roč.~358, August, s.~35-43. ISSN~0037-0738. doi:10.1016/j.sedgeo.2017.06.010. 2017.
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