海南岛近海B106柱粘土矿物学指标的古气候环境意义

Paleoclimate Environmental Significance of Clay Mineral Analysis of Core B106 at Offshore Hainan Island

通过对海南岛近海B106沉积柱粘土矿物的定性、定量分析,依据其AMS14C定年数据,参照对比前人采用其它研究方法和研究对象获得的古气候环境事件结论,提出用(伊-蒙混层矿物+伊利石)/高岭石([I/S+I]/K)含量比值的矿物学指标来指示古气候环境事件。结果显示B106柱的粘土矿物学指标指示出14 775 BC以来的7次古气候事件,说明在一定条件下利用海洋沉积柱粘土矿物组合、含量的变化特点,也可以揭示万年尺度内的古气候环境事件。

Qualitative and quantitative analysis of the clay mineral in the offshore sedimentary core B106 was used to indicate the paleoclimate environmental events. According to the dating result from AMS14C and formal studies, the content ratio （about illite-smectite interstratified clay minerals ＋ illite） vs kao- linite （[-I/S＋I]/K） was proposed to achieve the indication. The clay minerals in the sedimentary core sample B106 presented seven paleoclimate events since 14 775 BC. Such a study showed that the clay mineral in the marine sedimentary core of the offshore of Hainan Island could reveal the paleoclimate environmental events within 10ka scales.