摘要
琼北广泛分布着第四纪不同地质年龄(0.014—1.15Ma)的玄武岩,其上覆盖着一层红土风化壳,风化壳发育程度与玄武岩喷出年龄成正比。时代较老的风化壳厚度大,而且,化学元素迁移量大;反之,则均小。根据母岩的年龄计算化学元素的迁移速率,它随风化时间增长而变化。母岩的风化程度用化学风化系数表示,它与风化时间成正比,据此,可以推算母岩的年龄。
The basaltic rocks on Hainan Island are mainly distributed in the northern part of the island. The age of these rocks ranges from 0.014Ma to l.l5Ma. The thickness and quantity of chemical components of weathering crust on basaltic rocks increase with time. The degradation rates of chemical composition change with time. The coefficient of chemical weathering increase with time.It is suggested that the coefficient of chemical weathering can be used to reveal the time of beasaltic rocks.
出处
《地质科学》
CAS
CSCD
北大核心
1992年第A12期295-301,共7页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
地震科学联合基金资助课题88-17
关键词
第四纪
玄武岩
化学
风化速率
weathering crust, basaltic rocks, chemical weathering rate, chemical weathering coefficient, geochronological dating
