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Chinese Science Bulletin

, Volume 47, Issue 11, pp 939–944 | Cite as

Discovery of low-mature hydrocarbon in manganese nodules and ooze from the Central Pacific deep sea floor

  • Hu Wenxuan 
  • Jin Zhijun 
  • Yao Suping 
  • Lu Xiancai 
  • Chen Zhilin 
  • Zhang Linye 
  • Zhang Xuejun 
  • Zhou Huaiyang 
Notes
  • 45 Downloads

Abstract

Extracts from manganese nodules and ooze from the Central Pacific deep sea floor were analyzed using the chromatogram-mass spectrum, and it was found that most of the biomarker molecules are of the low-mature type (some have characteristics of mature): the ratio of “A”/C is high between 11.4%–19.75%; CPI is 1.22–1.23; C31-22S/ (22S+22R) hopane is 0.59–0.60, Tm/Ts is 0.99–1.99; βa moretane/(aβ+βa) hopane is 0.12 – 0.14; C29 sterane 20S/(20S+20R) is 0.35 – 0.41; ββ/(ββ+αα) is 0.38 – 0.45; arene TA(I)/TA(I+II) is 0.16–0.21; methyl-phenanthrene index (MPI1) is 0.35–0.67. According to the geological settings of the sampling area and its organic geochemical characteristics, it is considered that the hydrothermal activities on the ocean floor facilitate the decomposition of organic matter in the sediment, which leads to the generation and migration of hydrocarbon into manganese nodules and ooze. This discovery is important for understanding the mechanisms of hydrocarbon generation in the ocean floor and for expanding the potential of oil and gas exploration in the ocean.

Keywords

manganese nodules ooze biomarker low-mature hydrocarbon 

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Copyright information

© Science in China Press 2002

Authors and Affiliations

  • Hu Wenxuan 
    • 1
  • Jin Zhijun 
    • 2
  • Yao Suping 
    • 1
  • Lu Xiancai 
    • 1
  • Chen Zhilin 
    • 3
  • Zhang Linye 
    • 3
  • Zhang Xuejun 
    • 3
  • Zhou Huaiyang 
    • 4
  1. 1.Department of Earth SciencesState Key Lab for Mineral Deposits Rearch, Nanjing UniversityNanjingChina
  2. 2.Basin & Reservoir Research CenterUniversity of PetroleumBeijingChina
  3. 3.Institute of Geological Research of Shengli Petroleum AdministrationDongyingChina
  4. 4.Second Institute of OceanographyState Oceanic AdministrationHangzhouChina

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