Micromorphological features of mineral matter from cryoconite holes on Arctic (Svalbard) and alpine (the Alps, the Caucasus) glaciers
Mineral grain micromorphology is a useful proxy for reconstructing the history of mineral matter deposited on glaciers. In this study, we focus on the grain shape and micromorphology of mineral particles collected from cryoconite holes on glaciers in the Alps, the Caucasus and Svalbard. We use the s...
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ftnipr:oai:nipr.repo.nii.ac.jp:00015943 2023-05-15T15:07:22+02:00 Micromorphological features of mineral matter from cryoconite holes on Arctic (Svalbard) and alpine (the Alps, the Caucasus) glaciers 2019-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15943 http://id.nii.ac.jp/1291/00015835/ en eng https://doi.org/10.1016/j.polar.2019.100482 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15943 http://id.nii.ac.jp/1291/00015835/ Polar Science, 22, 100482(2019-12) 18739652 Sediment sources Grain morphology Quartz Polymeric substances Cryoconite Journal Article 2019 ftnipr https://doi.org/10.1016/j.polar.2019.100482 2022-12-03T19:43:16Z Mineral grain micromorphology is a useful proxy for reconstructing the history of mineral matter deposited on glaciers. In this study, we focus on the grain shape and micromorphology of mineral particles collected from cryoconite holes on glaciers in the Alps, the Caucasus and Svalbard. We use the scanning electron microscopy (SEM) to better understand the origin, transport regime, depositional processes, biofilm formations, degradation and grain transformation. Our results show that chemical and physical weathering are equally relevant in shaping mineral grains, although in polar and cold regions physical processes dominate. Grains with smooth edges owing to chemical weathering in some of the investigated samples, represent more than 60–70%. Comparison of main grain-type abundance helped to establish that climate is not the most important factor affecting grain micromorphology on glaciers, but local rock sources and supraglacial processes. We hypothesize that grain surface roughness plays an essential role with respect to biofilm formation, while at the same time bacteria-enhanced weathering enriches micromorphology (we observed polymeric substances on some of grains) and release critical compounds for nutrient-poor glacial systems. Thus, grain type and morphology might be an important factor influencing cryoconite granules formation and productivity of cryoconite holes. Article in Journal/Newspaper Arctic Polar Science Polar Science Svalbard National Institute of Polar Research Repository, Japan Arctic Svalbard Polar Science 22 100482 |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
Sediment sources Grain morphology Quartz Polymeric substances Cryoconite |
spellingShingle |
Sediment sources Grain morphology Quartz Polymeric substances Cryoconite Micromorphological features of mineral matter from cryoconite holes on Arctic (Svalbard) and alpine (the Alps, the Caucasus) glaciers |
topic_facet |
Sediment sources Grain morphology Quartz Polymeric substances Cryoconite |
description |
Mineral grain micromorphology is a useful proxy for reconstructing the history of mineral matter deposited on glaciers. In this study, we focus on the grain shape and micromorphology of mineral particles collected from cryoconite holes on glaciers in the Alps, the Caucasus and Svalbard. We use the scanning electron microscopy (SEM) to better understand the origin, transport regime, depositional processes, biofilm formations, degradation and grain transformation. Our results show that chemical and physical weathering are equally relevant in shaping mineral grains, although in polar and cold regions physical processes dominate. Grains with smooth edges owing to chemical weathering in some of the investigated samples, represent more than 60–70%. Comparison of main grain-type abundance helped to establish that climate is not the most important factor affecting grain micromorphology on glaciers, but local rock sources and supraglacial processes. We hypothesize that grain surface roughness plays an essential role with respect to biofilm formation, while at the same time bacteria-enhanced weathering enriches micromorphology (we observed polymeric substances on some of grains) and release critical compounds for nutrient-poor glacial systems. Thus, grain type and morphology might be an important factor influencing cryoconite granules formation and productivity of cryoconite holes. |
format |
Article in Journal/Newspaper |
title |
Micromorphological features of mineral matter from cryoconite holes on Arctic (Svalbard) and alpine (the Alps, the Caucasus) glaciers |
title_short |
Micromorphological features of mineral matter from cryoconite holes on Arctic (Svalbard) and alpine (the Alps, the Caucasus) glaciers |
title_full |
Micromorphological features of mineral matter from cryoconite holes on Arctic (Svalbard) and alpine (the Alps, the Caucasus) glaciers |
title_fullStr |
Micromorphological features of mineral matter from cryoconite holes on Arctic (Svalbard) and alpine (the Alps, the Caucasus) glaciers |
title_full_unstemmed |
Micromorphological features of mineral matter from cryoconite holes on Arctic (Svalbard) and alpine (the Alps, the Caucasus) glaciers |
title_sort |
micromorphological features of mineral matter from cryoconite holes on arctic (svalbard) and alpine (the alps, the caucasus) glaciers |
publishDate |
2019 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15943 http://id.nii.ac.jp/1291/00015835/ |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Polar Science Polar Science Svalbard |
genre_facet |
Arctic Polar Science Polar Science Svalbard |
op_relation |
https://doi.org/10.1016/j.polar.2019.100482 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15943 http://id.nii.ac.jp/1291/00015835/ Polar Science, 22, 100482(2019-12) 18739652 |
op_doi |
https://doi.org/10.1016/j.polar.2019.100482 |
container_title |
Polar Science |
container_volume |
22 |
container_start_page |
100482 |
_version_ |
1766338893130498048 |