古高程计:氢氧同位素的新应用

被引:7
作者
杨红梅
王成善
机构
[1] 中国地质大学地球科学与资源学院
关键词
古高程计; 氢同位素; 氧同位素;
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
定量恢复高大地形的古高程是地质学家一直以来追求的目标,将自生矿物中氢氧同位素用作古高程计的历史不长,这种方法还有很大的应用潜力,可用到比新生代更古老的时期。根据与气团上升和水汽凝结的热动力学性质相关的瑞利平衡分馏原理,建立了这种古高程计的热动力模型,这个模型应用简便,适用于纬度小于35°的地区。区域性经验关系的方法误差较小,但也有计算繁琐、适用区域有限的不足。以上两种方法的计算精度均有待于提高。研究中使用方解石作为样品最普遍,在方解石、高岭石、蒙脱石和针铁石等矿物中,究竟使用哪种推算古高程产生的误差更小,还需进一步研究。
引用
收藏
页码:960 / 968
页数:9
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