Branched glycerol dialkyl glycerol tetraethers in lake sediments: Can they be used as temperature and pH proxies?

被引:137
作者
Blaga, Cornelia I. [1 ]
Reichart, Gert-Jan [1 ]
Schouten, Stefan [2 ]
Lotter, Andre F. [3 ]
Werne, Josef P. [4 ,5 ]
Kosten, Sarian [6 ]
Mazzeo, Nestor [7 ]
Lacerot, Gissell [6 ,8 ]
Damste, Jaap S. Sinninghe [1 ,2 ]
机构
[1] Univ Utrecht, Fac Geosci, Dept Mol Biogeochem, NL-3584 CD Utrecht, Netherlands
[2] NIOZ Royal Netherlands Inst Sea Res, Dept Marine Organ Biogeochem, NL-1790 AB Den Burg, Netherlands
[3] Univ Utrecht, Inst Environm Biol, Sect Palaeoecol, Lab Palaeobot & Palynol, NL-3584 CD Utrecht, Netherlands
[4] Univ Minnesota, Large Lakes Observ, Duluth, MN 55812 USA
[5] Univ Minnesota, Dept Chem & Biochem, Duluth, MN 55812 USA
[6] Wageningen Univ, Aquat Ecol & Water Management Grp, NL-6700 AA Wageningen, Netherlands
[7] Univ Republica, Fac Ciencias, Dept Ecol, Grp Ecol & Rehabil Sistemas Acuat, Montevideo 11400, Uruguay
[8] Univ Republ Montevideo, Fac Ciencias, Dept Ecol, Secc Limnol, Montevideo 11400, Uruguay
关键词
TERRESTRIAL ORGANIC-MATTER; CRENARCHAEOTAL MEMBRANE-LIPIDS; BIT INDEX; WATER TEMPERATURES; RECONSTRUCTION; TRANSPORT; PALAEOTHERMOMETER; DISTRIBUTIONS; ASSEMBLAGES; HOLOCENE;
D O I
10.1016/j.orggeochem.2010.07.002
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
070403 [天体物理学]; 070902 [地球化学];
摘要
A series of surface sediments from 82 lakes of variable water depth and size was analyzed for glycerol dialkyl glycerol tetraethers (GDGTs) in order to investigate the potential of the MBT/CBT (methylation ratio/cyclization ratio of branched tetraethers) as a continental palaeothermometer in lacustrine environments. Branched GDGTs dominated in most sediments, as indicated by the high branched vs. isoprenoid tetraether (BIT) values. We observed that CBT and MBT varied substantially. Mean annual air temperature (MAAT reconstructed) and pH values were calculated using the CBT and MBT values and the calibration from the global soil data set. The MBT/CBT inferred temperatures were considerably lower than measured values. Nevertheless, there was a significant correlation between MAAT reconstructed and MAAT observed on site, although there was still considerable scatter (r(2) 0.47). Lacustrine sediments integrate organic remains of organisms in a lake and its drainage basin, thereby offering a unique opportunity for calibrating MBT and CBT, as small scale variability is averaged out. Since the source of the branched GDGTs in the lake sediments is ambiguous, it is not clear whether only temperature and pH in the catchment area are the driving factors. Therefore, even in lake sediments with high concentrations of branched GDGTs the straightforward application of MBT/CBT as palaeoproxies may be difficult given the uncertainties regarding their source and origin. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1225 / 1234
页数:10
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