摘要
对南沙海域中大陆坡柱状沉积物中甾醇进行了分析，从中检出了碳数为C_(27)-C_(30)的11种甾醇生物标志化合物。它们的组成特征反映了沉积有机质主要来自浮游生物，陆源高等植物的贡献很少；不同沉积层段中甾醇的组成差异可能与生态环境有关；甾烷醇与甾烯醇比值随沉积深度而增加的趋势，指示了甾烯醇向甾烷醇的转化，这种转化可能是通过化学和生物化学的氢化作用实现的。
The recent marine sediments from core 103 (11°12′ N, 110°24′ E) located in themiddle continental slope (1584m water depth) of Nansha Sea, China, were analyzedfor sterols. C_(27), C_(28), C_(29), and C_(30), including △~5-, △^(22)- and △^(5,22)-sterols and 5α-stanolswere detected. Major sterols in the studied samples is C_(27), sterols which comprise from44.5% to 54.6% of the total sterols. This indicates that the organic matter insediments from the middle continental slope of Nansha Sea is mainly derived frommarine plankton, whereas the contribution of higher-land plants to sediments is small.A considerable increase in the abundance of C_(27), sterols in 48-58cm and 77-87cmsections of the sediment core are probably related to change of ecologic environments.Variations in starols/sterols ratios with burial depth reflect the transformation ofsterols to stanols by chemical and biochemical hydrogenation.
出处
《地球化学》
CAS
CSCD
北大核心
1998年第1期74-80,共7页
Geochimica
基金
中国科学院南沙海域综合科学考察项目!85-927-02-02
甘肃省自然科学基金
中青年科技基金!ZR-95-084
关键词
甾醇
有机质来源
南沙海域
沉积物
地球化学
middle continental slope, sterol, organic matter source, ecology,diagenetic transformation, Nansha Sea
