热带地理 ›› 2016, Vol. 36 ›› Issue (2): 284-295.doi: 10.13284/j.cnki.rddl.002825
黄日辉,刘 韫,王 为
出版日期:
2016-03-31
发布日期:
2016-03-31
通讯作者:
王为(1956―),男,广东人,教授,博士,主要从事海岸地貌及第四纪环境演变研究,(E-mail)wangw@scnu.edu.cn。
作者简介:
黄日辉(1988―),男,广东人,博士研究生,主要从事海岸地貌及环境演变研究,(E-mail)huangrhok@foxmail.com
基金资助:
HUANG Rihui,LIU Yun,WANG Wei
Online:
2016-03-31
Published:
2016-03-31
摘要: 风化坑是常见的岩石坑穴地形,但容易被误解或与其他成因坑穴地形混淆。通过对庙湾岛风化坑地貌特征及形态参数进行详细测量和分析,采集风化坑内残积碎屑物、坑外岩石和当地风化壳样品进行粉晶X射线荧光光谱化学主量分析(XRF)和X射线衍射矿物分析(XRD),对风化坑发育的成因机制进行了探讨,并得出以下结论:1)风化坑的发育与地形坡度有关,通常出现在平坦裸露的岩石面上。2)风化坑的形态特征表现为宽且浅,口缘有出水口,底部平坦,侧壁最凹处与出水口高度一致,其口径发育的速度远大于深度,长轴发育速度远大于短轴。3)同一岩石面上的风化坑具有不同的大小和深度,显示了其发育程度不一,其最大、最小深度对比反映了风化坑的发育过程。4)风化坑碎屑物与表岩之间的元素迁移和化学蚀变指数(CIA值)的差异,反映了风化坑的化学风化成因。5)风化坑碎屑物的英长比大于表岩,证明了化学风化导致的矿物差异风化作用。研究表明:庙湾岛风化坑形成和发育的主要作用为坑内积水的化学风化。
黄日辉,刘韫,王为. 广东庙湾岛风化坑的地貌特征及成因[J]. 热带地理, 2016, 36(2): 284-295.
HUANG Rihui,LIU Yun,WANG Wei. Topography,Morphological Characteristics and Formation of Weathering Pit in the Miaowan Island, Guangdong, China[J]. TROPICAL GEOGRAPHY, 2016, 36(2): 284-295.
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