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研究了我国内蒙古、新疆和青海的9个硫酸盐型盐湖表层(0~10 cm)沉积物中的长链烯酮. 除干盐湖罗布泊外, 其他8个盐湖的沉积物中均检测出长链烯酮. 分析结果表明硫酸盐型湖泊中可能广泛存在长链烯酮. 多数湖泊现代沉积物中长链烯酮丰度变化顺序是C37 > C38 > C39 > C40. 通过对咸水湖、盐湖沉积物中长链烯酮不饱和度与湖区多年春、夏、秋、冬和年平均温度关系的分析, 发现咸水湖和盐湖中长链烯酮不饱和度(K37U)与湖区年平均温度相关性最好, 相关系数为0.88(R2 = 0.88). 湖泊水体温度对长链烯酮不饱和度的控制机制可能与海洋中的相似, K37U可能会成为利用湖泊沉积物重建古温度的重要替代指标.
The long-chain enones in the sediments of 9 sulphate-type salt lakes (0 ~ 10 cm) in Inner Mongolia, Xinjiang and Qinghai were studied. Except for the dry salt lake Lop Nor, the sediments of the other 8 lakes showed long chain The results showed that the long-chain ketene could exist widely in the sulphate-type lakes.Changes of the long-chain enones in modern lakes are C37> C38> C39> C40. The analysis of the relationship between the long-chain alkenone unsaturation and the average annual temperature of spring, summer, autumn, winter and year in the lake showed that the correlation between the long-chain alkenone unsaturation (K37U) and the annual average temperature in the lake was the best, The correlation coefficient was 0.88 (R2 = 0.88). The control mechanism of lake water temperature on long chain alkenone unsaturation may be similar to that in the ocean. K37U may be an important surrogate for the reconstruction of paleobrafts by lake sediments.