Hydrothermal alteration of organic matter in sediments of the Northeastern Pacific Ocean: Part 2. Escanaba Trough,Gorda Ridge |
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| Institution: | 1. AMPHOS 21 Consulting S.L., Passeig de Garcia i Faria, 49-51, 1-1, 08019 Barcelona, Spain;2. Departamento de Geociencias, Instituto de Diagnostico Ambiental y Estudios del Agua (IDAEA-CSIC), C/Jordi Girona 18-26, 08034 Barcelona, Spain;3. Posiva Oy, Olkiluoto, FI-27160 Eurajoki, Finland;1. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina;2. Centro de Investigaciones de la Geósfera y la Biósfera (CIGEOBIO) e Instituto de Geología (INGEO), Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Argentina;1. Ophthalmology, CHU de Saint-Étienne, avenue Albert Raimond, 42055 Saint-Étienne cedex 1, France;2. Internal Medicine, CHU de Saint-Étienne, avenue Albert Raimond, 42055 Saint-Étienne cedex 1, France;1. Department of Surgery, Cumming School of Medicine, University of Calgary, Calgary, Canada;2. Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Canada;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China;2. University of Science and Technology of China, Hefei 230026, China;3. Palaeoecosystems Group, Department of Earth Sciences, Durham University, Durham DH1 3LE, UK;4. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Department of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China;3. Research Institute of Petroleum Exploration & Development, SINOPEC, Beijing 100083, China;4. Tarim Oil-field Company, PetroChina, Korla, Xinjiang 841000, China |
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| Abstract: | Samples from the Ocean Drilling Program Leg 169 in Escanaba Trough, Gorda Ridge, NE Pacific Ocean, were analyzed to study maturation by accelerated diagenesis and/or by catagenesis of the sedimentary organic matter to hydrothermal petroleum. At Site 1038 the hydrothermal petroleums have migrated after generation to shallower horizons. The n-alkane maturation was indicated by the strong even C number preference (i.e., CPI <1.0) as in the case of Middle Valley. All samples contained admixed organic matter of terrigenous and marine components as indicated by the distributions of the biomarkers. The biological precursors were catagenetically altered to their equivalent mature compounds. The presence of high molecular weight PAHs in some sediment sections at Site 1038 reflected the high temperature alteration and reworking of organic matter into mature hydrothermal petroleum. At Site 1037, the reference hole in the Escanaba Trough, the n-alkanes with a strong predominance of odd C number homologs reflected immature non-marine lipid components essentially throughout the hole. Maturation of organic matter was only observed below 450 mbsf with n-alkanes showing a CPI <1.0. The strong even C number predominance in those intervals was attributed to initial maturation by high heat flow during the early rifting process. |
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