Abstract：
:Because their molecular signatures are often prominent in extracts of sediments, bacteria are thought to be important contributors to petroleum source beds. It has been shown recently, however, that abundances of biomarkers do not always reflect relative contributions to sedimentary organic carbon (Corg). The contribution of photosynthetic green sulphur bacteria to sediments can be assessed effectively because the diagenetic products of distinctive carotenoids from these organisms occur widely and their biomass is isotopically labelled, being enriched in 13C. We show here that, although sediments and oils from the Western Canada and Williston basins contain prominent biomarkers of photosynthetic bacteria, the absence of 13C enrichment in the total Corg requires that the bacterial contribution is in fact minimal. Although the importance of bacterial reworking of sedimentary debris cannot be doubted, we argue that our findings, when considered in conjunction with those from other settings, suggest that bacterial biomass may commonly represent only a minor component of total Corg in carbonaceous rocks.
journal_name
Naturejournal_title
Natureauthors
Hartgers WA,Sinninghe Damste JS,Requejo AG,Allan J,Hayes JM,de Leeuw JWdoi
10.1038/369224a0keywords:
subject
Has Abstractpub_date
1994-05-19 00:00:00pages
224-7issue
6477eissn
0028-0836issn
1476-4687journal_volume
369pub_type
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