氧同位素阶段5c～d时期川东北石笋Mg,Sr和Ba记录及其意义

被引：15

作者：

周厚云 ^{[1
,2
]}

王悦 ^{[2
]}

黄柳苑 ^{[2
]}

麦上泉 ^{[2
]}

机构：

[1] 西南大学地理科学学院

[2] 华南师范大学地理科学学院

来源：

科学通报 | 2011年 / 56卷 / 33期

关键词：

MIS 5c～d; 岩溶洞穴沉积; 微量元素;

D O I：

暂无

中图分类号：

P597 [同位素地质学与地质年代学];

学科分类号：

070902 ;

摘要：

采用等离子体原子发射光谱仪(ICP-AES)对采自川东北诺水河地区梭子洞的石笋SZ2(发育时代120～103kaBP)的Mg,Sr,Ba等微量元素地球化学指标进行了分析.结果显示SZ2的Mg/Ca在(9500～14700)×10-6之间,Sr/Ca在(54～123)×10-6之间,Ba/Ca在(31～82)×10-6之间.这3个元素比值均显示了显著的千年尺度变化,并与气候环境之间具有良好的对应关系:在相对寒冷干旱的氧同位素阶段(MIS)5d时期Mg/Ca表现为相对低值,而Sr/Ca和Ba/Ca表现为相对高值;在相对温暖湿润的MIS5c时期这3个元素比值呈现相反的变化.通过从分配系数和岩溶地下水微量元素含量两个角度的分析,认为SZ2的Mg/Ca变化可能主要受到温度变化的控制,而Sr/Ca和Ba/Ca的变化可能主要受到地表土壤和大气粉尘活动与洞穴内先期碳酸盐沉积等因素影响.Sr/Ca和Ba/Ca是否直接受到温度和石笋生长速率等因素的影响则有待以后对相关机制的更深入研究.在从MIS5d向MIS5c转换的时期,3个元素比值均领先于氧同位素(δ18O)的变化.这可能反映了:(1)控制Sr/Ca和Ba/Ca的粉尘活动等机制与温度变化密切相关;(2)主要受太阳辐射控制的温度变化超前受夏季风和冬季温度两者共同控制的δ18O变化.

引用

页码：2791 / 2796

页数：6

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