洞穴石笋古温度研究的同位素地球化学方法  

ISOTOPIC GEOCHEMISTRY METHODS FOR PALEOTEMPERATURE STUDIES OF CAVE SPELEOTHEMS

作　　者：洪阿实[1] 彭子成[1] 李平[1] 

机构地区：[1]国家海洋局第三海洋研究所,中国科学技术大学地球和空间科学系

出　　处：《地球科学进展》1995年第4期348-352,共5页Advances in Earth Science

基　　金：国家自然科学基金

摘　　要：应用同位素地球化学方法，并以现代溶岩水的δ￣１８Ｏ＿ｗ代替石笋生长时期原生包体水的δ￣１８Ｏ＿ｗ，根据Ｏ’Ｎｅｉｌ方程，计算了福建宁化天鹅洞内第四纪碳酸盐堆积物的古温度。结果表明，温度计算偏差在±０．５℃左右。在与全球深海氧同位素曲线对比后，指出该地区大约在２１０～１８ｋａＢＰ，武木亚间冰期的起始时间（氧同位素期３／４阶界限）估计在６５ｋａＢＰ。结果表明，福建宁化地区晚第四纪古气候环境没有形成冰川的条件，但明显受到全球气温变化的控制。Applying the isotopic dating and temperature-probing techniques,the isotopic pale-otemperature of the speleothems evolutions from the Tian-e Cave,Ninghua county of Fu-jian Province,is obtained based on the O' Neil' s Equation. The temperature evolutionalcurve is compared with that of the global O isotopic curve of deep-sea foraminifera ,whichshows that:in this area there had obviously experienced five times of large temperaturevariation processes from about 210 ka to 18 ka BP,which corespond to the 6th,the 5th,the4th,the 3rd and the 2th stage respectively in the oxygen isotopic periodity. It is estimatedthat the Riss glacial ended up at about 155 ka BP,and the Wurm subinterglacial began atabout 65 ka BP, Results argue that there was no conditions to form glacier in this area un- der the Late Quaternary paleoclimate environments, which was influenced by the globaltemperature variations substantially.

关 键 词：石笋 古温度 同位素地球化学 洞穴 古气候 

分 类 号：P532[天文地球—古生物学与地层学]