飛騨山脈・野口五郎岳周辺における花崗岩類の風化特性と地形

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概要

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• Weathering characteristics of two kinds of granites and their influences on landforms are compared along the main ridge of the Mt. Noguchi-goro area, the northern Japanese Alps. The two lithologies (granites A and B) contrast in the Schmidt rock hammer rebound, P-wave velocity, weathering index and physical rock properties. The granite A has lower rock strength and produces finer rock debris composed mainly of pebbles and finer materials than the granite B, reflecting the difference in the mineral composition. The granite A is subject to granular disintegration resulting from the high content of plagioclase that is sensitive to weathering. In contrast, the granite B produces a wide range of rock debris sizes from pebbles to boulders, reflecting the high content of K-feldspar that is less susceptible to granular disintegration and the predominance of macrogelivation along joints. The weathering characteristics of the two lithologies affect the types and morphology of the alpine landforms in the area, including patterned grounds, tors and mass movement features. For instance, the fine and homogeneous sizes of debris lead to the predominance of sorted stripes on slopes in the granite A area, while the wide range of debris sizes is responsible for turf-banked terraces in the granite B area. The contrasting weathering features indicate that chemical weathering plays an important role in the grain size distribution of surface materials as well as frost shattering.

• 日本地形学連合の論文
• 2007-07-25

著者

• 西井 稜子

  筑波大・院

• 西井 稜子

  筑波大学大学院生命環境科学研究科

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• 13.赤石山脈・間ノ岳におけるテンションクラック群の変位観測(一般研究発表会(口頭発表),2007年度秋季研究発表会)
• 世界最北の大学での短期集中コース「永久凍土・周氷河環境」に参加して(ひろば)
• 飛騨山脈・野口五郎岳周辺における花崗岩類の風化特性と地形
• 飛騨山脈の花崗岩山域における斜面崩壊が線状凹地の分布に及ぼす影響
• 飛騨山脈の花崗岩山域における斜面崩壊が線状凹地の分布に及ぼす影響

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