柴达木盆地东北部中新世沉积物色度记录的气候变化

Miocene is the key period for studying the Cenozoic climate changes. The sediment of the Naoge section which is located in the Northeast of the Qaidam Basin could record Climate changes from ～18.4 to 6.9Ma.Based on the measurement and the analysis of the color of the sidement ,we got the high resolution changes of the color during this period.The change of the color is related to the Oxidation-reduction reactions,the redness and the hematite is positively correlated. The Climate change of this area from 18.4 to 6.9 Ma can be identified the following stages: the warm and humid period(～18.4～14.2Ma) ;the cold and humid period (14.2~7.7Ma);the cold and dry period (7.7～6.9Ma),the global temperature maybe caused this change and the climate transformation leads to the changes of the sedimentary facies and the color values.