JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 H (地球人間圏科学) » H-TT 計測技術・研究手法

[H-TT22] [EE] Non destructive techniques applied to stone cultural heritages

2017年5月22日(月) 13:45 〜 15:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:小口 千明(埼玉大学大学院理工学研究科)、Celine Elise Thomachot-Schneider(GEGENAA (Groupe d etude des geomateriaux et environnements naturels, anthropiques et arch?ologiques), EA3795, University or Reims (France))、Patricia V?zquez(GEGENAA - Universit? Reims-Champagne-Ardenne)、青木 久(東京学芸大学)

[HTT22-P01] Influence of micro climatic conditions on salt weathering

シャルマ サントシ2、*小口 千明1有賀 夏希3青木 久4早川 裕弌5 (1.埼玉大学大学院理工学研究科、2.埼玉大学大学院、3.東京地図研究社、4.東京学芸大学、5.東京大学)

キーワード:salt weathering, environmental monitoring, gypsum

This study evaluated the influence of micro-climatic conditions on rock weathering in the Yoshimi hyaku-ana cave. Air temperature and relative humidity (RH) were measured at hourly intervals. Samples of weathering debris, which had fallen from the cave wall, were collected on a monthly basis and analysed by X-ray Powder Diffraction (XRD) to identify the mineralogy of the salts within the debris. The results showed that, within the range of temperature and relative humidity investigated here, there were significant decreases in air temperature with increasing distance from the cave entrance, but no significant differences in relative humidity between the sites. The amount of salts and debris near the cave entrances was greater than from inner cave wall surfaces, which may be linked to the micro climatic conditions. Gypsum (CaSO4.2H2O) was the only secondary mineral identified in the fallen debris which may be related to the higher humidity within the cave. Gypsum (CaSO4.2H2O) also has a very low solubility and is therefore liable to crystallize under a wide range of environmental conditions. The highest rates of salt weathering were observed under the more humid conditions during spring and summer, with lower rates of salt weathering in the drier conditions during autumn and winter.