海洋地质与第四纪地质2012，Vol.32Issue(1)：133-140,8.DOI:10.3724/SP.J.1140.2012.01133
可可西里BDQ0608钻孔沉积物色度环境意义及其影响因素
ENVIRONMENTAL IMPLICATION OF COLOR REFLECTANCE OF DRILL HOLE BDQ0608, KEKE XILI REGION AND ITS INFLUENCING FACTORS
摘要
Abstract
Color reflectance records of the sediment cores taking from the Hole BDQ0608 in a palaeo-lake in Keke Xili region were studied for palaeoenvironmental and palaeoclimatic changes. Although the results of dry and wet samples have similar trend along the sediment profile, their values are of distinct difference. The variation of a" and b" values is relatively small, whereas the difference of L* reaches 22. 48. To some extent, the color reflectance of lake sediments may partly indicate their diagenetic environment, as revealed by the visual inspection of lithology of core sediments. The variations of L" values are mainly related to the changes in contents of total organic carbon (TOO. The correlation between grain size and L* suggests that sediment environment is certainly a factor to the storage and preservation of total organic carbon, and hence L* values of sediments could be used as an environment indicator. Compared to other proxies, variations of Ca* b* are possibly attributed to the color-causing minerals formed by the oxidation-reduction reaction under the temperature and moisture conditions at that time. Positive correlations between Ca* b* values and magnetic susceptibility, TOC and carbonate contents indicate that high values of Ca' b" probably reflect a relatively high water level and a warm and wet environment, as confirmed by grain size record.关键词
色度/湖泊沉积/影响因素/可可西里地区Key words
Color reflectance/ Lacustrine sediments/ Influencing factor/ Keke Xili region分类
天文与地球科学引用本文复制引用
田庆春,杨太保,石培宏,祝合勇,张述鑫..可可西里BDQ0608钻孔沉积物色度环境意义及其影响因素[J].海洋地质与第四纪地质,2012,32(1):133-140,8.基金项目
国家自然科学基金项目(40871057) （40871057）
