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沉积学报  2015 

重庆羊子洞MIS5a/MIS4转换时期石笋微量元素记录及其气候意义

DOI: 10.14027/j.cnki.cjxb.2015.02.009, PP. 299-305

Keywords: 石笋,微量元素,羊子洞,三峡库区

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Abstract:

利用重庆丰都羊子洞石笋Y02ICP-MS测年数据、微量元素数据和石笋氧同位素数据重建了三峡库区76~69kaB.P.时段的古气候环境信息。将石笋Y02测试数据与太阳辐射曲线、格陵兰NGRIP冰芯和南海海表温度进行对比分析,结果显示石笋Mg/Ca主要响应降水变化,而Sr/Ca、Ba/Ca和U/Ca更多地响应地表土壤状况和当地大气粉尘活动,间接响应降水变化;石笋Y02δ18O记录出现偏重的趋势比微量元素比值增大时间晚1ka多,表明石笋微量元素比值可能还受到温度影响。

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