摘要
海南岛北部地区,第四系火山岩覆盖面积4000km^2以上。本文根据火山岩与第四纪地层的接触关系、火山岩的绝对年龄测年数据和火山岩顶部红土风化壳的风化系数,将火山岩的形成时期按先后划分为六期,即金牛岭期、光村期、多文岭期、德文岭期、长流期和雷虎岭期。
The volcanic rocks in Hainan Island are mainly distributed in the northern part of the island with an area of 4159.79 km2 about 12% of the total area of the island. These vol. canic rocks are mainly basalte and volcaniclastics.The stage-division of the volcanic rocks are mainly based on the stratigraphy and chronology of the volcanic rocks and the development stages of weathering crust from basalts The development stages of weathering crust from basalts are depend on the ratio between the contents of SiO2 Fe2O3, Al2O3 of laterite and basalt, i.e. the weathering coefficient.The development of the volcanic rocks in Hainan Island can be divided into 6 periods:1. Jinniuling period(N2). 2. Quangcuan period (N2 - Q11).3. Duowenling period (Q12 - Q21). 4. Deyiling period (Q23). 5. Changliu period(Q31). 6. Leihuling period(Q41).
出处
《地质科学》
CAS
CSCD
北大核心
1989年第1期67-76,共10页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
第四系
火山岩
分期
测年数据
volcanic rock, chronological deserminations, weathering coefficient, development stages
