Geochemical contrast of the physical properties,the source characters and the depositional environment of the organic matter from the different strata of the equatorial Pacific area

ZHANG Hai-sheng; YU Pei-song; NI Jian-yu; WU Guang-hai; SUN Wei-ping; LU Bing

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Article Navigation > Haiyang Xuebao > 2008 > 30(6): 60-68

ZHANG Hai-sheng, YU Pei-song, NI Jian-yu, WU Guang-hai, SUN Wei-ping, LU Bing. Geochemical contrast of the physical properties,the source characters and the depositional environment of the organic matter from the different strata of the equatorial Pacific area[J]. Haiyang Xuebao, 2008, 30(6): 60-68.

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Geochemical contrast of the physical properties,the source characters and the depositional environment of the organic matter from the different strata of the equatorial Pacific area

1.
Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
2.
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2008-08-05
Rev Recd Date: 2008-11-05

Abstract

Abstract

Chloroform bitumen A、saturated-hydro carbon, arene, nonhydrocarbons, n-alkannes isopre- noids and terpenoids of samples of four stations from the equatorial Pacific area were analyzed by the gas chromatography method.The result showed that the content of nonhydrocarbon was higher than those of saturated-hydrocarbon and arene, and the value of saturated-hydrocarbon/arene was relatively lower.The order of evolvement was WP02-1 > ES0103 > W2001-2 > MP2001-01.All of the samples could be divided into two groups according to the character of n-alkanes.The characteristic of one group was single peak form with high-carbon.The range of CPI and nC₂₃^-/nC₂₄⁺ was 0.812~1.380 and 0.081~0.234, re- spectively.These indicated that the source of the n-alkanes was mainly aquatic higher macro phytes origin.The other group of n-alkanes come of both lower thalloses and terrigenous origin according to their CPI with 0.983~1.382 and nC₂₃^-/nC₂₄⁺ with 0.631~0.950, and double peaks of gas chromatography.All the samples we studied were low-mature hydrocarbon and reductive environment played an important role in the formation and preservation of low-mature hydrocarbon.
- equatorial Pacific,
- organic matter,
- the physical properties and the source characters,
- low-mature hydrocarbon,
- sedimentary environment

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