极地研究

极地研究 ›› 1997, Vol. 9 ›› Issue (3): 38-46.

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南极布兰斯菲尔德海峡表层沉积物生物标志化合物

卢冰;唐运千;眭良仁   

  • 出版日期:1997-09-30 发布日期:1997-09-30

THE BIOMARKER COMPOUNDS IN SURFICIAL SEDIMENTS FROM THE BRANSFIELD STRAIT,ANTARCTICA

  • Online:1997-09-30 Published:1997-09-30

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摘要：

本文研究了南极布兰斯菲尔德海峡表层沉积物中烷基环己烷、烷基苯、胡萝卜烷、甾烯和萜烷化合物的分布特征。烷基环己烷的母源物质主要是海洋生物，并混有陆源物。Ｇ－１５站和Ｇ－３２站的烷基苯以Ｃ１２烷基苯为主，碳数范围在Ｃ１１～Ｃ２４；而Ｇ－２５站以Ｃ２１烷基苯占优势，不含有Ｃ１７和Ｃ１９～２０烷基苯化合物。胡萝卜烷主要为β－胡萝卜烷，并含有全氢化β－胡萝卜素，甾烯化合物中检出２４－乙基胆甾－５－烯、甾二烯和胆甾－５－烯。萜烷化合物中的二环倍半萜碳数范围在Ｃ１７～Ｃ２１；羊毛甾烷分别为Ｃ３０８β（Ｈ）、９α（Ｈ）－羊毛甾烷、Ｃ３１的２４－甲基羊毛甾烷和Ｃ３２的２４－乙基羊毛甾烷。ββ构型的Ｃ２９１７β（Ｈ），２１β（Ｈ）－３０－降藿烷、Ｃ３０１７β（Ｈ），２１β（Ｈ）－藿烷和Ｃ３１１７β（Ｈ），２１β（Ｈ）－升藿烷等化合物的存在，表明布兰斯菲尔德海峡表层沉积物有机质的低成熟度。

关键词: 布兰斯菲尔德海峡,表层沉积物,烷基环己烷,烷基苯,胡萝卜烷,甾烯,萜烷

Abstract:

The distribution patterns of alkyl cyclohexane,alkylbenzene,carotane,sterene and terpane compounds in surficial sediments from the Bransfield strait,Antarctica are studied.The precursor of alkyl cyclohexane mainly derived from marine organism and mixed with terrestrial matter. The main peak of alkylbenzene is C 12 alkylbenzene in stations G 15 and G 32,carbon number ranging from C 11 to C 24 ;the predominance of C 21 alkylbenzene is present in station G 25,but C 17 and C 19-20 compounds are absent. The β carotane is the principal compound in carotane series and contains perhydro carotene.24 ethylcholest 5 en,steradiene and cholest 5 en are present in the sediments. The carbon number of bicyclic sesquiterpenes ranges from C 17 to C 21 . The lanostane compounds are C 30 8β(H),9α(H) lanostane,C 31 24 methyllanostane and C 32 24 ethyllanostane. The presence of biologicial conifugration of ββ type as C 29 17β(H),21β(H) 30 norhopane,C 30 17β(H),21β(H) hopane and C 31 17β(H),21β(H) homohopane indicate the low maturity of the sedimentary organic matter.