Mineralogical composition of cryoconite on glaciers in northwest Greenland（グリーンランド北西部の氷河上クリオコナイトの鉱物組成）

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概要

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• The mineralogical composition of cryoconite on a glacial surface was investigated on six glaciers in northwest Greenland (Qaanaaq, Qaqortaq, Tugto, Bowdoin, Sun, and Scarlet Heart).　The X-ray diffraction analysis showed that the cryoconites mainly contained seven silicate minerals: hornblende, quartz, potassium feldspar, plagioclase, illite, kaolinite, and chlorite.　Semi-quantitative mineralogical analysis of the silicate mineral composition on the Qaanaaq Glacier showed little variation among the samples collected from five different elevations.　This indicates that the minerals on the glacier were probably dominated by dust from a unique source, which is recently transported from local sediments, including soil and moraine.　On the other hand, the mineral composition varied significantly among the glaciers.　Based on the clay mineral content, the glaciers could be classified into three groups.　Type A: high clay mineral content, composed of illite and kaolinite, found on Qaanaaq, Qaqortaq, and Tugto;Type B: high clay mineral content, composed of only kaolinite, found on Sun;and Type C: lower clay mineral content, composed of only kaolinite, found on Bowdoin and Scarlet Heart.　The geographical distribution of the types of glaciers did not correspond with the geology in this area, indicating that the mineralogical composition is not determined just by the geological conditions around glaciers, but also by other factors, such as the redistribution of sediments by glacial, fluvial, or coastal processes.

• 公益社団法人 日本雪氷学会の論文

著者

• NAGATSUKA Naoko（永塚尚子）

  National Institute of Polar Research

• TAKEUCHI Nozomu（竹内望）

  Department of Earth Sciences, Graduate School of Science, Chiba University

• UETAKE Jun（植竹淳）

  National Institute of Polar Research

• SHIMADA Rigen（島田利元）

  Department of Earth Sciences, Graduate School of Science, Chiba University

関連論文

• Field activities of the "Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic" (SIGMA) Project in Greenland in 2011-2013（2011-2013年グリーンランドにおけるSIGMAプロジェクトの野外活動報告）
• Mineralogical composition of cryoconite on glaciers in northwest Greenland（グリーンランド北西部の氷河上クリオコナイトの鉱物組成）

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