摘要
为研究广东韶关市丹霞山砂岩蜂窝状洞穴及白斑成因,对世界自然遗产地丹霞山景区内玉女拦江洞中采集的6个砂岩蜂窝状洞穴样品,以及在鸭麻岩地区采集的4个白斑样品,进行XRF和ICP-MS元素地球化学分析及岩石薄片偏光显微镜鉴定。结果表明,发育蜂窝状洞穴的砂岩体与其基岩砂岩体的成分含量相近,岩体内部成分差异不是蜂窝状洞穴的成因。综合分析认为,丹霞山砂岩蜂窝状洞穴的产生是岩石的矿物组成及结构、洞穴所在的地形条件、气候因素和蜂窝状洞穴所形成的微气候共同作用的结果。对白斑的元素分析结果显示,发育白斑的砂岩在成岩过程中,红色基岩形成于氧化环境,而白斑形成于还原环境中,赤铁矿被还原形成白斑。
Abundant typical sandstone morphologic shapes developed in Mt. Danxiashan. We collected six samples of sandstone honeycombs in Yunulanjiang Cave and four samples of white spots in Yamayan to do component analysis （XRF and ICP - MS） with the purpose of explaining their genesis. The results indicate that the component contents of samples in honeycombs and bedrock are similar so that there is no direct relationship between lithological differences and honeycomb＇ s formation. The comprehensive analysis reveals that honeycombs are the result of physical weathering. And the rock structure, topography, climate and cavern microclimate are important influencing factors in the formation process of honeycombs. In the discussion of sandstone white spot, reducing conditions prevail in the process and some minerals are dissolved. Reduction of Fe making the color change from red to white with water percolating through the rock, thereby forming a white spot on the surface.
出处
《山地学报》
CSCD
北大核心
2015年第3期279-287,共9页
Mountain Research
基金
国家自然科学基金项目(41371204
41171163)
国家科技基础性专项重点项目(2013FY111900)~~
关键词
广东丹霞山
砂岩
成分分析
蜂窝状洞穴
白斑
Mt. Danxiashan
sandstone
component analysis
honeycombs
white spot
