| 摘要: |
| 通过对南太平洋劳盆地东部扩张中(ELSC)表层沉积物样品中甘油二烷基甘油四醚脂类化合物(GDGTs)的分析结果表明, 所有样品均检测出类异戊二烯 GDGTs 和支链 GDGTs。其中, 类异戊二烯 GDGTs 占总 GDGTs 的 58.1%—93.4%, 泉古菌醇(crenarchaeol)、GDGTⅠ和 GDGTⅤ为其主要组分,说明古菌对于GDGTs的相对贡献量大, 非嗜热泉古菌是最主要输入源, 受其影响, 热液活动记录难以从类异戊二烯 GDGTs 中识别。与此相比, 支链 GDGTs |
| 关键词: 古菌, 细菌, GDGTs, 热液喷口 |
| DOI：10.11693/hyhz201103002002 |
| 分类号: |
| 基金项目:中国科学院知识创新工程重要方向项目, KZCX2-YW-JC103 号; 中国科学院广州地球化学研究所人才基金项目, GIGRC-09-02 号; 国家自然科学基金项目, 40976025; 国际海底区域研究开发“十一五”项目“深海生物地球化学过程在地质体中的记录”, DYXM-115-02 -4-04 号 |
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| GLYCEROL DIALKYL GLYCEROL TETRAETHER LIPIDS COMPOSITION AND ITS BIOGEOCHEMISCAL IMPLICATIONS OF SURFACE SEDIMENTS FROM THE EASTERN LAU SPREADING CENTER, SOUTH PACIFIC OCEAN |
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CHEN Gu-Kui1,2, HU Jian-Fang1, YANG Qun-Hui3, PENG Ping-An1
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1.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences;2.Graduate University of Chinese Academy of Sciences;3.State Key Laboratory of Marine Geology, Tongji University
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| Abstract: |
| The glycerol dialkyl glycerol tetraethers (GDGTs) lipid composition was determined in surface sediments from the Eastern Lau Spreading Center (ELSC), South Pacific Ocean. Isoprenoid and branched GDGTs were detected in all the samples. The relative contents of isoprenoid GDGTs were in the range of 58.1%—94.3% of total GDGTs. GDGT Ⅵ (crenarchaeol), GDGTⅠand GDGTⅤ are the most abundant, suggesting significant contribution of archaea with the
nonthermophilic crenachaea being the dominant strain. The isoprenoid GDGTs composition did not record the hydrothermal activities as high percentage of GDGTs was derived from nonthermophilic crenachaea. However, the branched GDGTs might record the hydrothermal activities. Relatively higher percentage (32.9%—41.9%) of branched GDGTs occurred in the samples taken from hydrothermal vent field, and relatively lower percentage (9.0%—16.7%) of branched GDGTs occurred in the samples taken from non-hydrothermal vent field. GDGT Ⅷa was the most abundant branched GDGTs in the samples taken from non-hydrothermal vent field. These patterns indicate that the branched GDGTs were derived from some anaerobic bacteria in situ, which supports the conclusion that branched GDGTs occurred not only in soils and peat bogs, but also hydrothermal vent field. |
| Key words: Archaea, Bacteria, GDGTs, Hydrothermal vent |
