The transfer of organic signatures from bedrock to sediment |
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| Authors: | John Parnell Stephen Bowden Gordon R Osinski Colin W Taylor Pascal Lee |
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| Institution: | 1. Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen AB24 3UE, UK;2. Canadian Space Agency, Saint-Hubert, Quebec, Canada J3Y 8Y9;3. Mars Institute, SETI Institute, NASA Ames Research Center, Moffett Field, California 94035-1000, USA;1. PetroChina Research Institute of Petroleum Exploration & Development - Northwest, Lanzhou, 730020, China;2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing, 100083, China;1. Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston, TX 77058, USA;2. NASA – Solar System Exploration Research Virtual Institute (SSERVI), USA;3. Western Australian Argon Isotope Facility, Department of Applied Geology and John de Laeter Centre for Isotope Research, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia;4. HNU – Neu-Ulm University, Wileystraße 1, D-89231 Neu-Ulm, Germany;5. Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstraße 18, D-70174 Stuttgart, Germany;6. Museum für Naturkunde – Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, D-10115 Berlin, Germany;7. Humboldt Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany;8. Geochronology Laboratory, University of Brasília, Brasília, Brazil;1. Helmholtz Centre Potsdam, German Research Centre for Geosciences GFZ, Telegrafenberg 1, 14473 Potsdam, Germany;2. Senckenberg Center for Human Evolution and Paleoenvironment, HEP Tübingen, Terrestrische Paläoklimatologie, Sigwartstr. 10, 72076 Tübingen, Germany;3. Department of Geoscience, University of Tübingen, Sigwartstr. 10, 72076 Tübingen, Germany;4. Chair of Engineering Geology, Technical University of Munich, Arcisstr. 21, 80333 Munich, Germany;5. Department of Earth and Environmental Sciences, Ludwig Maximilians University, Munich, Germany;6. Department of Earth Sciences, University of Geneva, rue des Maraîchers 13, 1205 Geneva, Switzerland;7. Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelan 1085, 1081 HV Amsterdam, The Netherlands;1. Clean Energy Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14 gil, Seongbuk-gu, Seoul 136-791, South Korea;2. Department of Clean Energy and Chemical Engineering, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 305-350, South Korea;3. School of Mechanical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746, South Korea;4. Sungkyun Advanced Institute of Nano Technology (SAINT), 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, South Korea |
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| Abstract: | A case study in the Canadian Arctic demonstrates how an organic geochemical signature in the regional bedrock can be transferred by erosion and redeposition to younger geological formations and surface sediments. The hydrocarbon composition recorded in Laurentian (Lower Palaeozoic) carbonate bedrock was incorporated into overlying Miocene and Quaternary formations, and modern mass waste, alluvium, snow/ice, and proglacial deposits, and further distant in ice-rafted detritus. The retention of the original geological organic signature is reflected in consistent thermal maturities (hopane ratios) and environmental indicators (sterane distributions). In the modern sediments, the geological signature is variably mixed with a modern microbial organic signature reflected in high values of carbon preference index and diploptene. These data show that hydrocarbon occurrences in bedrock may be detected by the analysis of surface detritus, especially in carbonate terrains. However they also indicate that environmental signatures may be misleading if they are inherited from older geological units. |
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