湖北三宝洞石笋铀同位素变化及其古气候意义

Jinguo Dong, Wei Diao, X. Kong
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引用次数: 3

摘要

作者收集并研究了湖北三宝洞石笋的大量氧同位素比值和U-Th年龄。石笋的铀系年代测定表明,石笋形成于第二次冰期至今。本文对三宝洞17根石笋进行了160次ICP-MS 230Th精确测量,研究了石笋中铀浓度与古气候的关系。结果表明,238U的变化与石笋的δ18O记录呈负相关,与西太平洋暖池温度变化呈正相关。石笋中238U浓度在间冰期波动快,冰期波动慢,在前两个终止期急剧上升。在轨道尺度上,平均生长速率越高,铀浓度越高,反之亦然。洞上土壤剖面的成土过程和复杂的土-水-岩相互作用与洞外气候变化密切相关,可能是造成铀浓度变化的原因。然而,石笋中234U/238U的变化似乎与过去18万年的外部古环境没有任何关系。因此,只能谨慎地将石笋中的铀浓度作为气候变化的新指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
VARIATION IN URANIUM ISOTOPES OF STALAGMITES FROM SANBAO CAVE, HUBEI PROVINCE: IMPLICATIONS FOR PALAEOCLIMATE: VARIATION IN URANIUM ISOTOPES OF STALAGMITES FROM SANBAO CAVE, HUBEI PROVINCE: IMPLICATIONS FOR PALAEOCLIMATE
A great number of oxygen isotope ratios and U-Th ages data were collected and studied by the authors for the stalagmites from the Sanbao cave,Hubei Province,China.Uranium-series dating of the speleothem suggests that the stalagmites are formed in the period from the penultimate glacial period up to the present.This paper deals with the relationship between uranium concentration in stalagmites and paleoclimate data induced from the 160 precise ICP-MS 230Th data collected from 17 stalagmites from the Sanbao Cave.We discovered that the variations in 238U show a negative relation with the δ18O records of the studied stalagmites,and a positive relation with the temperature changes in West Pacific Warm Pool.The concentration of 238U in the stalagmites fluctuated rapidly during the interglacial periods,slowly during the glacial periods,and increased sharply in the past two terminations.On the orbital scale,the higher the average growth rate,the higher the uranium concentration is,and vice versa.The results also show that the pedogenic processes of the soil profile above the cave and the complex soil-water-rock interaction are well related with the outer-cave climate changes,possibly responsible for the shifts of uranium concentration.However,the shift of the 234U/238U in stalagmites seems having no any relation with the external palaeoenvironment over the past 180000 years.Therefore,the uranium concentration in the stalagmite could only be used as a new proxy for climate change with caution.
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