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湖泊科学  2004 

青海湖沉积碳酸盐矿物之间氧同位素分馏的评估及其环境意义

DOI: 10.18307/2004.0305

Keywords: 青海湖,碳酸盐矿物,氧同位素分馏,环境变化

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Abstract:

青海湖沉积岩芯的矿物学和稳定同位素研究结果显示自生碳酸盐矿物以单种或多种矿物形式保存在沉积物中;不同碳酸盐样品的δ18O值的变化范围为5.47‰至-1.04‰,差值最高达6.5‰;δ18O值与总碳酸盐含量呈正相关关系,与碳酸盐矿物种类的改变则无明显关联.结果表明,造成δ18O显著变化的主导因素是湖水氧同位素组成,自然条件下生成的不同碳酸盐之间的氧同位素分馏不明显.说明δ18O是指示闭流湖泊降水蒸发水量平衡变化的敏感指标之一.

References

[1]  李军,余俊清.黄旗海介形类及其壳体稳定同位素环境记录.盐湖研究,2002,10(4):13-18
[2]  郑淑蕙,郑斯成,莫志超.稳定同位素地球化学分析.北京,北京大学出版社,1986:81-464
[3]  Northrop D A, Clayton R N. Oxygen isotopic fractionation in systems containing dolomite. J Geol, 1966, 74:174 - 196
[4]  Faure G. Principles of isotope geology. New York: John Wiley & Sons, 1977:368 - 369
[5]  Fritz P, Smith D G W. The isotopic composition of secondary dolomites. Geochimica et Comochimica Acta, 1970, 34:1161 - 1173
[6]  Lister G S, et al. Lake Qinghai, China: closed-basin lake levels and the oxygen isotope record for ostracoda since the latest Pleistocene. Palaeogeogr Palaeoclimatol Palaeoecol, 1991, 84:141 - 162
[7]  Yu J Q, Kelts K R. Abrupt changes in climatic conditions across the late glacial/Holocene transition on the N. E. Tibet-Qinghai Plateau: evidence from Lake Qinghai, China. J Paleolimno, 2002, 28:195 - 206
[8]  顾兆炎,刘嘉麒,袁宝印等.12000年来青藏高原季风变化--色林错沉积物地球化学的证据.科学通报,1993,38(1):61-64
[9]  Sheppard S M F, Schwarcz H P. Fractionation of carbon and oxygen isotopes and magnesium between coexisting metamorphic calcite and dolomite. Contr Mineral Petrol. 1970, 26:161 - 198
[10]  O\' Neil J R, Epstein S. Oxygen isotope fractionation in the system dolomite-calcite-carbon dioxide. Science, 1966, 152:198 - 201
[11]  Yu J Q, et al. Paleoenvironmental signatures from carbonate minerals and stable isotopic composition from Lake Qinghai,China. Chtem Geol, 2004 (in review)

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