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FORMATION PROCESSES OF TAFONI DUE TO SALT WEATHERING

盐风化导致的 TAFONI 形成过程

基本信息

批准号：
09680182
负责人：
WARAGAI Tetsuya
金额：
$ 1.02万
依托单位：
NIHON UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680182/
关键词：
TAFONI ROCK MEAL GROWTH RATES SALT WEATHERING ROCK TEMPERATURE WATER CONTENTS SEA SPLASH JAPAN 乾湿風化風化作用風送塩モニタリング

项目摘要

Tafoni are small hollow, which rock materials composing of the tafoni are removed resulting from weathering. There are observed in arid and coastal regions. It has been thought that the tafoni originate from the wind erosion and the wave action. In this study, formation processes, conditions, and rates of the tafoni are analyzed at north of Matsusima bay (Oku-Matsushima), southwest of Boso Peninsula, and south of Kii Peninsula, based on the annual observation using the data logger.Analyses mainly are carried out for Oku-matsushima, 1) sizes (length, width, and depth) and grain size for the rock meal of the tafoni, 2) production volume of the rock meal, 3) field monitoring of conditions for tafoni formation (rock temperature, water contents of slope, temperature, humidity, insolation, wind direction, etc), 4) rock properties (physical properties, mineral components, dissolution properties).The shape of the tafoni similar to half of the spheroid, and sizes of the tafoni is decrease with distance from beach lines and altitudes. The rock meal mainly product in winter seasons. It was considered that the growth rates of the tafoni are 10ィイD12ィエD1〜10ィイD13ィエD1 year, based on the production volume of the rock meal. Some salt minerals (Halite and Bloedite) are observed in winter season at the inner wall of tafoni showing the dry conditions. As the tafoni develop at the coastal region, these salt minerals are crystallized by adhere of sea splash including ions of NaィイD1+ィエD1, MgィイD12+ィエD1, ClィイD1-ィエD1, and SOィイD24ィエD2ィイD12-ィエD1.

塔佛尼是一种小空洞，组成塔弗尼的岩石材料因风化而被移除。在干旱和沿海地区观察到了这种现象。前人认为塔弗尼起源于风蚀和波浪作用。本研究利用测井资料，对松岛湾北部、波索半岛西南部、麒麟半岛南部的塔弗尼形成过程、条件和速率进行了分析，主要分析了大松岛岩粉的大小(长、宽、深)和粒度，2)岩粉产量，3)塔弗尼形成条件(岩石温度、坡面含水率、温度、湿度、日晒、风向等)，4)岩石性质(物性、矿物成分、成分、风向等)。塔弗尼形状类似球体的一半，大小随着距离海滩线的距离和海拔的升高而减小。岩粉主要产于冬季。根据岩粉的产量，认为牛肉粉的生长速度为10ィイD12ィエd1~10ィイD13ィエd1年。冬季在塔弗尼的内壁观察到一些盐类矿物(盐岩和褐铁矿)，显示出干燥的条件。随着塔夫尼在沿海地区的发育，这些盐类矿物是由NaィイD 1+ィエD 1、MgィイD12+ィエD 1、ClィイD 1-ィエD 1和ィイD24ィエD 2ィイD 12-ィエD 1等海溅离子附着结晶而成的。