Experimental study on the influence of acid rain on rocks and minerals

酸雨对岩石和矿物影响的实验研究

基本信息

批准号：
12640473
负责人：
KOBAYASHI Shoichi
金额：
$ 2.24万
依托单位：
Kurashiki University of Science and the Arts
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640473/
关键词：
Acid rain Artificial weathering Rocks Minerals H_2SO_4 HNO_3 HCI Carbonated water ハンレイ岩二酸化炭素花崗岩

项目摘要

In order to predict the effect of acid precipitation on building stone and rock- forming minerals, artificial chemical weathering of polished plates of granite from Kitagi, Okayama, gabbro from Muroto, Kochi, and their rock forming minerals as olivine, clinopyroxene and biotite, was conducted. An improved Soxhelt extraction apparatus was used with distilled water, and H_2SO_4, HNO_3 and HCL solution of Ph3 or 4, and carbonated water at 55 ℃ for periods of time up to 850 days. The granite and gabbro were composed mainly of quartz, plagioclase, alkali feldspar and biotite, and olivine, plagioclase and clinopyroxene, respectively. The leached sample solutions were analyzed for major and minor elements using ICP, ICP- MS and ion- chlomatography. Morphological and chemical changes of each mineral surface were studied by SEM, EPMA and microscopic techniques. Alteration products were collected from the surface of each mineral on the polished plates by hand picking and examined using an XRDMolar ratios of each element in leached solutions to those in the fresh rocks and minerals varied depending on the experimental period. It seems that plagioclase and biotite in granite, and olivine and plagioclase in gabbro are easily weathered from the molar ratios. It is evident that biotite, plagioclase, and olivine in the rocks changed into mica- clay minerals and vermiculite, smectite and gibbsite, and smectite, illite and chlorite by exposure to the various acid solutions

为了预测酸降水对建筑石材和岩石形成矿物的影响，进行了人造化学化学风化，从Kitagi，Kitagi，冈山，Muroto，高知的Gabbro，高知的Gabbro及其岩石形成矿物质，例如橄榄石，clinopyrothe，Clinopyroxene和Biotite。使用蒸馏水，将改良的索入萃取设备与pH3或4的H_2SO_4，HNO_3和HCl溶液一起使用，并在55°的碳酸水溶液中，持续时间为850天。花岗岩和gabbro分别由石英，斜长石，碱长石和生物云母组成，以及橄榄石，斜长石和斜石。使用ICP，ICP- MS和离子芯片摄影分析了落后的样品溶液的主要和次要元素。每个矿物表面的形态和化学变化是通过SEM，EPMA和微观技术研究的。通过手拾取从抛光板上的每个矿物的表面收集改变产物，并使用步行溶液中每个元素的XRDMolar比与新鲜岩石和矿物质中的XRDMolar比进行检查，这取决于实验时期。似乎花岗岩中的斜长石和生物云石，而gabbro中的橄榄石和斜长石很容易从摩尔比率中进行风化。有证据表明，岩石中的生物岩，斜长石和橄榄石通过暴露于各种酸溶液中，变成了岩石矿物质，斑岩矿物质和斑岩矿物质，绿石和吉布斯特岩，以及蒙脱石，伊利石和氯酸盐。