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中新世是新生代古气候变化的关键时期。本文以柴达木盆地东北部瑙格剖面18.4～6.9Ma沉积物为研究对象,通过对沉积物颜色指标的测定与分析,获得该时段沉积物高分辨率颜色指标变化序列。发现色度值变化与氧化—还原作用有关,红度值与赤铁矿相对含量呈正相关。结合其它资料分析表明,柴达木盆地东北部地区中新世气候变化为18.4～14.2Ma相对暖湿阶段、14.2～7.7Ma相对冷湿阶段、7.7～6.9Ma相对干冷阶段,其变化可能受到全球温度变化的影响,气候转型主要导致了该区沉积相和沉积物色度的变化。
Miocene is a crucial period of Cenozoic paleoclimate change. In this paper, the 18.4 ~ 6.9Ma sediments in the Noghua section of the northeastern Qaidam Basin are taken as the research object. Through the determination and analysis of the sediment color indexes, the sequence of high resolution color indexes of the sediments is obtained. It is found that the change of colorimetric value is related to oxidation-reduction, and the redness value is positively correlated with the relative content of hematite. According to other data analysis, the climate change in the northeastern Qaidam Basin is 18.4 ~ 14.2Ma relative humidity and warm stage, 14.2 ~ 7.7Ma relative humidity stage, 7.7 ~ 6.9Ma relative dry and cold phase, and its change may be affected by global Due to the influence of temperature change, climate change mainly resulted in the change of sedimentary facies and sediment color in this area.