Journal of Tropical Oceanography >
Composition and diagenesis of low-mature hydrocarbon and its interaction with some elements from Core W2001-2 in the Eastern Pacific Ocean
Received date: 2009-04-14
Revised date: 2010-01-05
Online published: 2011-10-10
Supported by
国家自然科学基金(40676061;41076072)和大洋矿产资源勘探开发专项(DY105-02-01)联合资助
Core W2001-2 was obtained with a multi-tube sampler in the Eastern Pacific Ocean at water depth of 5102 m (154?07?42?W, 10?30?34?N). Chloroform bitumen “A,” organic matters and microelements were analyzed in order to investigate the effect of organic matters on sediment diagenesis. The results showed that the distribution of Core W2001-2 presented obvious changes, especially at the lines of 21—33 cm and 33—48 cm. The n-alkanes showed dominance in C25 and distribution in unimodality. The CPI (carbon preference index) value was between 0.90 and 1.26 with a slight odd-even predominance, indicating that organic matters sourced mainly from deeper submarine ooze as well as a little from marine algae. The lower ratios of Pr/Ph (<0.81) suggested a strong reducing environments. The characteristics of low contents of saturated hydrocarbon and aromatic hydrocarbon, with high contents of non-hydrocarbon compounds including non-hydrocarbon and asphaltene that amount is in the range of 49.63% to 59.66%, indicated that the property of the sediment was at a low-mature stage. The results also showed that organic matters and chloroform bitumen “A” had a positive relativity to Ti and V, but an inverse relativity to P, Mg and Mn. These relations confirmed the interactions between organic matters and some elements under low-mature conditions.
ZHANG Hai-sheng,YU Pei-song,NI Jian-yu,YAO Xu-ying, . Composition and diagenesis of low-mature hydrocarbon and its interaction with some elements from Core W2001-2 in the Eastern Pacific Ocean[J]. Journal of Tropical Oceanography, 2010 , 29(5) : 49 -55 . DOI: 10.11978/j.issn.1009-5470.2010.05.049
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