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海洋通报  2012 

南黄海北部表层沉积物中生物标志物的组成特征及其地球化学意义

DOI: 10.11840/j.issn.1001-6392.2012.2.011, PP. 198-206

Keywords: 沉积物,有机质,生物标志物,地球化学,南黄海

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Abstract:

通过对南黄海北部14个站位的19个表层沉积物样品进行了粒度、有机碳、GC-FID和GC-MS-MS测定,探讨沉积物有机质中生物标志物组成特征及地球化学意义。研究区表明,沉积物有机碳含量较高,正构烷烃呈双峰分布,具有明显奇偶优势、平均L/H为0.36,说明沉积物中陆源高等植物贡献占优,分析对比表明其沉积物可能主要来自古黄河输入。类异戊二烯烃Pr/Ph均值0.46,表明有机质沉积于强还原环境;Pr/C17和Ph/C18值均小于1,并且随深度有减小的趋势,反映了研究区微生物的降解作用。甾类化合物C29豆甾烷>C27胆甾烷>C28麦角甾烷,说明萜类化合物和甾类化合物主要为陆相输入。较高OEP值、高丰度的藿烯和莫烷及甾烷S构型含量均反映了现代沉积物中有机质未熟-低熟特征,但由于原始母质影响和微生物发育,Ts/Tm和C31αβS/(S+R)、C32αβS/(S+R)、C33αβS/(S+R)和C29αββ/(ααα+αββ)值较高。

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