洞穴石笋初始234U/238U值变化的古气候记录意义

被引：13

作者：

杨琰 ^{[1
]}

袁道先 ^{[1
]}

程海 ^{[2
]}

覃嘉铭 ^{[3
]}

林玉石 ^{[3
]}

张美良 ^{[3
]}

朱晓燕 ^{[3
]}

机构：

[1] 西南大学地理科学学院

[2] 美国明尼苏达大学地质与地球物理系

[3] 中国地质科学院岩溶地质研究所

来源：

地质学报 | 2008年 / 05期

基金：

中国博士后科学基金;

关键词：

石笋; 初始234U/238U; 铀同位素; 古气候; 西南地区;

D O I：

暂无

中图分类号：

P532 [古气候学];

学科分类号：

070903 ;

摘要：

通过对我国西南地区3个洞穴9根大型石笋272个初始234U/238U数据的分析研究,发现石笋初始234U/238U值长尺度变化与海洋沉积SPECMAP曲线δ18O记录有一定的正相关关系,与北纬25°夏季太阳辐射能量变化曲线呈一定的负相关关系,石笋初始234U/238U值的变化在冰期时波动强烈,而在间冰期波动相对平缓,在间冰期和冰期(间冰阶和冰阶)转化阶段该值呈跳跃状态变化。末次冰期及全新世阶段石笋初始234U/238U变化记录了该时段内的BA暖期和YD突变冷事件;全新世8200 a BP、7200 a BP、5200 a BP、4200 a BP、2800 a BP、1400 a BP发生的几次较强冷事件在石笋初始234U/238U值都有相应记录,并且和长尺度的变化规律一致,冷事件发生时石笋初始234U/238U值偏重,暖期偏轻。封闭系统形成的洞穴石笋初始234U/238U变化类似于同地区洞穴石笋的δ18O对气候变化的记录特征,在我国西南地区两者与夏季风变化的强弱呈现一种负相关的关系,洞穴石笋初始234U/238U值可以作为一个有用的古气候替代指标来研究古降水的变化。

引用

页码：692 / 701

页数：10

共 21 条

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