Microbial lipid markers within and adjacent to Challenger Mound in the Belgica carbonate mound province, Porcupine Basin, offshore Ireland (IODP Expedition 307)

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doi: 10.1016/j.margeo.2010.05.007
Author(s): Mangelsdorf, Kai; Zink, Klaus G.; di Primio, Rolando; Horsfield, Brian
Author Affiliation(s): Primary:
GeoForschungsZentrum Potsdam, Potsdam, Germany
Other:
Ghent University, Belgium
Leibniz-Institute of Marine Sciences, Germany
University of Geneva, Switzerland
Volume Title: COld-water CArbonate Reservoir systems in Deep Environments; COCARDE
Volume Author(s): Spezzaferri, Silvia, editor; van Rooij, David; Rüggeberg, Andres; Samankassou, Elias; Henriet, Jean-Pierre
Source: COld-water CArbonate Reservoir systems in Deep Environments; COCARDE, edited by Silvia Spezzaferri, David van Rooij, Andres Rüggeberg, Elias Samankassou and Jean-Pierre Henriet. Marine Geology, 282(1-2), p.91-101. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 35 refs.; illus., incl. 5 tables, sketch map
Summary: During the Integrated Ocean Drilling Program (IODP) Expedition 307 for the first time a cold-water coral carbonate mound was drilled down through its base into the underlying sediments. In the current study, sample material from within and below Challenger Mound, located in the Belgica carbonate mound province in the Porcupine Basin offshore Ireland, was investigated for its distribution of microbial communities and gas composition using biogeochemical and geochemical approaches to elucidate the question on the initiation of carbonate mounds. Past and living microbial populations are lower in the mound section compared to the underlying sediments or sediments of an upslope reference site. A reason for this might be a reduced substrate feedstock, reflected by low total organic carbon (TOC) contents, in the once coral dominated mound sequence. In contrast, in the reference site a lithostratigraphic sequence with comparatively high TOC contents shows higher abundances of both past and present microbial communities, indicating favourable living conditions from time of sedimentation until today. Composition and isotopic values of gases below the mound base seem to point to a mixed gas of biogenic and thermogenic origin with a higher proportion of biogenic gas. Oil-derived hydrocarbons were not detected at the mound site. This suggests that at least in the investigated part of the mound base the upward flow of fossil hydrocarbons, being one hypothesis for the initiation of the formation of carbonate mounds, seems to be only of minor significance. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Anthozoa; Atlantic Ocean; Belgica Mounds; Biogenic structures; Bioherms; Biomarkers; Carbonate sediments; Challenger Mound; Cnidaria; Cold-water environment; Communities; Europe; Expedition 307; Geochemistry; Hydrocarbons; IODP Site U1317; IODP Site U1318; Integrated Ocean Drilling Program; Invertebrata; Ireland; Lipids; Marine sediments; Microorganisms; Mounds; Natural gas; North Atlantic; Northeast Atlantic; Organic compounds; Petroleum; Porcupine Basin; Porcupine Seabight; Sedimentary structures; Sediments; Total organic carbon; Western Europe
Coordinates: N512300 N512300 W0114300 W0114300
N512600 N512600 W0113300 W0113300
Record ID: 2011053841
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands