北极巴罗AB-67钻孔岩芯的沉积过程分析

THE SEDIMENTARY PROCESS ANALYSIS OF AB 67 DRILLING CORE IN BARROW,ALASKA

对巴罗ＡＢ－６７钻孔岩芯的粒度分析资料和地球化学分析资料进行了系统的多变量沉积过程分析。结果表明，３２～６０ｃｍ岩芯段为陆相沉积，该段沉积环境和沉积过程都较为稳定；２０～３２ｃｍ岩芯段为由陆相向海相转换的过渡时期，此时粗粒的含Ｃｒ磁性矿物由峰值跌入谷值，硅、钙质氧化物减少，钛、铁质氧化物增加，有机质成分增加；０～２０ｃｍ岩芯段为海相沉积，本段沉积粗粒成分很少，氧化物、粘土、有机质和吸附成分波动很大，表层淋溶残余成分迅速增加，物源环境稳定。

The systematic multi variable analysis of sedimentary environment on the grain size data and geochemical data of AB 67 drilling core in Barrow is given in this paper. Results show that 32-60 cm section of the core is continental deposits, and this sedimentary environment and process are stable and steady;20-32cm section is a transition period from continental deposits to marine sediments, and magnetic mineral with Cr decrease sharply,the oxides of Si and Ca reduce, one of Ti and Fe increase, organic matter raise;10-20 cm is marine sediments, coase grain is a little, oxide, silt, organic matter and adsorbed composition fluctuate greatly, leached remain composition speed to increase in surface layer, the source of matter is stable, but dynamic environment change greatly.