ENVIRONMENTAL IMPLICATION OF COLOR REFLECTANCE OF DRILL HOLE BDQ0608, KEKE XILI REGION AND ITS INFLUENCING FACTORS
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摘要: 通过对青藏高原腹地可可西里边缘地区古湖泊体BDQ0608钻孔岩心分析发现,色度在干样和湿样测试中,它们的变化趋势相同,但值有很大的不同,a*和b*值变化较小,而L*值变化较大,达到了22.48,并且色度值随岩心明暗有很好的变化趋势,说明岩心颜色反映一定的成岩环境,可以作为一个环境指标来恢复过去环境。进一步分析认为,L*值高低变化主要是由于总有机碳含量高低引起的。粒度与L*相关分析表明,沉积环境的改变会影响总有机碳的储存情况,进而影响L*值的变化。通过对彩度Ca*b*与其他环境代用指标的分析,认为引起沉积物彩度Ca*b*值变化的主要原因可能是由于当时的温度和水分所引起的氧化-还原反应所生成的致色矿物。彩度Ca*b*值与磁化率、总有机碳和碳酸盐含量都呈正相关关系,而且高的彩度值通常与高的黏土组分含量变化表现出较好的一致性,说明彩度Ca*b*的高值可能指示了较高的湖面,此时研究区环境相对暖湿。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 (TOC). 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.
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Key words:
- Color reflectance /
- Lacustrine sediments /
- Influencing factor /
- Keke Xili region
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