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Predominance of even carbon-numbered n-alkanes from lacustrine sediments in Linxia Basin, NE Tibetan Plateau: Implications for climate change
- Source :
-
Applied Geochemistry . Oct2010, Vol. 25 Issue 10, p1478-1486. 9p. - Publication Year :
- 2010
-
Abstract
- Abstract: This study reports the first observation of predominant even C-numbered n-alkanes from sediments in the continuous lacustrine-sedimentary section (Maogou) from the Late Miocene to the Early Pliocene (13–4.4Ma) in the Linxia Basin, NE Tibetan Plateau. The n-alkanes showed a bimodal distribution that is characterised by a centre at n-C16–n-C20 with maximum values at n-C18 and n-C27–n-C31 as well as at n-C29. The first mode shows a strong even C-number predominance (OEP16–20 0.34–0.66). In contrast, the second mode has a strong odd C-number predominance (OEP27–31 1.20–2.45). Certain types of special autochthonous bacteria are a possible source for this distribution of even C-numbered n-alkanes in lacustrine sediments. These bacteria may have a high production rate in weak oxic–anoxic and arid depositional environments, in which a variety of geochemical parameters have recorded palaeoclimate change. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08832927
- Volume :
- 25
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Applied Geochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 53969858
- Full Text :
- https://doi.org/10.1016/j.apgeochem.2010.07.002