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滇池湖泊沉积物中甘油二烷基甘油四醚脂的组成特征
  • ISSN号：1000-0550
  • 期刊名称：《沉积学报》
  • 时间：0
  • 分类：P593[天文地球—地球化学;天文地球—地质学]
  • 作者机构：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640, [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳550002, [3]中国石油勘探开发研究院,北京100083
  • 相关基金：国家自然科学尽会项目（批准号：40525011,40632011）资助.
作者： 熊永强[1], 吴丰昌[2], 王铜山[3], 李芸[1], 房吉敦[2], 王丽芳[2], 陈华山[1]
关键词： 甘油二烷基甘油四醚脂, BIT, CBT, MBT, 湖相沉积物, 滇池, glycerol dialkyl glycerol tetraether lipids, BIT, CBT, MBT, lake sediment, Dianchi
中文摘要：

以云贵高原浅水湖泊—滇池作为研究对象,在对湖心一个63 cm沉积物柱样的有机质总体及分子有机地球化学研究的基础上,对沉积物有机质中甘油二烷基甘油四醚脂（GDGTs）组成进行了测定。研究结果表明,滇池湖泊沉积物中具有丰富的GDGTs,且以反映陆相土壤来源的支链类GDGTs为主。该沉积柱样中支链类GDGTs的环化指标（CBT）和甲基化指标（MBT）揭示出：1）整个沉积阶段滇池流域土壤的pH值主要介于7.5－8.2,相对中、下部层段,上部层段pH值呈现略微减小的趋势；2）基于CBT/MBT重建的滇池流域内年平均气温呈现由早期的温暖潮湿气候逐渐向寒冷干燥气候变化,近来又有所回暖的变化过程,这可以很好地解释该沉积柱中、下层段记录的总体有机质主要特征的演化规律。

英文摘要：

Glycerol dialkyl glycerol tetraether lipids in the Lake Dianchi sediments were determinated based on bulk and molecular organic geochemical analyses of a lake sediment core （63 cm in length）. The results indicate that the Lake Dianchi sediments have abundant GDGTs, and are dominated by the branched GDGTs from terrestrial soils. Methylation and cyclisation indices of branched tetraethers in this core samples reveal that 1 ） during the whole deposi- tional stage of the core DC-4, soil pH values of Lake Dianehi watershed are in the range of 7.5 - 8.2. Compared with the lower and middle section, the upper section has relatively low pH. 2）reconstructed mean annual air temperature of the Lake Dianchi watershed based on CBT/MBT displays a trend of changing from warm and moist climate in the early stage to cold and dry climate, and then become warm again lately. This variation can be used to explain the characteristics of bulk organic matter recorded in the lower and middle section of the core.

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期刊信息
  • 《沉积学报》
  • 北大核心期刊（2011版）
  • 主管单位:
  • 主办单位:中国科学院兰州地质研究所 中国矿物岩石地球化学学会沉积学专业委员会 中国地质学会沉积地质专业委员会
  • 主编：刘宝珺
  • 地址：兰州市东岗西路382号
  • 邮编：730000
  • 邮箱：cjxb@ns.lzb.ac.cn
  • 电话：0931-4960916
  • 国际标准刊号：ISSN：1000-0550
  • 国内统一刊号：ISSN：62-1038/P
  • 邮发代号:54-45
  • 获奖情况:
  • 国内外数据库收录:
  • 美国化学文摘（网络版）,美国地质文献预评数据库,英国动物学记录,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊（2004版）,中国北大核心期刊（2008版）,中国北大核心期刊（2011版）,中国北大核心期刊（2014版）,中国北大核心期刊（2000版）
  • 被引量:24598