用洛川黄土中碳同位素重建140万年以来古气候  

Predicting Paleo-climate Since 140 Ma B.P. by Experiment of Carbon Isotope in Loess

作　　者：卢玉东[1] 孙建中[1] 李佩成[1] 

机构地区：[1]长安大学环境科学与工程学院,西安710054

出　　处：《干旱区资源与环境》2008年第1期60-63,共4页Journal of Arid Land Resources and Environment

基　　金：中澳国际合作项目"黄土碳同位素;铁含量与古气候";国家科委项目(2002BA901A43)项目"中国西北不同生态地域山川秀美试验示范区建设与重大科技难题研究"资助

摘　　要：在洛川黄土剖面,通过密集采样,做出从第三纪红到整个第四纪黄土地层的碳同位素分析。1δ3C曲线可与大西洋深海钻孔DSDP607的氧同位素曲线及南极氘温度详细对比。S5上有一个特别突出的负高峰,1δ3C=-16.615‰,是气候最温湿的阶段。S0、S1、S4、S8、S9的δ13C峰值在-5.85—-10.00‰之间,是一般间冰期阶段。峰值在-8.72—-6.95‰的S2、S3、S6、S7等对应的是温干的间冰期。L1、L2、L5、L6、L8、L9的1δ3C在-3.7—-2.27‰之间,是一些极冷的冰期。因此,黄土1δ3C是一个灵敏的替代性古气候指标。Carbon isotope Of loess through Ternary red to whole Quaternary loess sequence at louchuan section in Shaanxi Provice, China were experimented. The curve of δ^13C compares well to the oxygen isotope curves of deep sea sediments from DSDP607 drill and temperature curve of deuteron isotope in Antarctic. There is obviously negative peak of δ^13C within S5 paleosol where the content of δ^13C is -16. 615‰, that shows the climatic was the most warm and humid. The climate of paleosol S0 ,S1 ,S4,S8 ,S9 which δ^13C content is -5.85 - - 10.00‰, represent the moderate interbalcial. δ^3 C content of paleosol S2. S3. S6. S7 is - 8.72 - -6.95‰, the climate was likely warm - dry interglacial during the periods. The loess layer L1. L2 . L5 . L6 . L8 . L9 represent the severe cold -dry glacial period with δ^13C content of -3.7 --2.27‰. It is proved by above illustration that the δ^13C of Chinese loess provides a type of very sensitive proxy indexes.

关 键 词：黄土 碳同位素 冰期 古气候 洛川 

分 类 号：P532[天文地球—古生物学与地层学]