Bacterial tetraether membrane lipids in peat and coal: Testing the MBT-CBT temperature proxy for climate reconstruction

被引:60
作者
Weijers, Johan W. H. [1 ,2 ]
Steinmann, Philipp [3 ]
Hopmans, Ellen C. [2 ]
Schouten, Stefan [1 ,2 ]
Damste, Jaap S. Sinninghe [1 ,2 ]
机构
[1] Univ Utrecht, Dept Earth Sci Geochem, NL-3584 CD Utrecht, Netherlands
[2] NIOZ Royal Netherlands Inst Sea Res, Dept Marine Organ Biogeochem, NL-1790 AB Den Burg, Netherlands
[3] Univ Neuchatel, Inst Geol, CH-2009 Neuchatel, Switzerland
基金
欧洲研究理事会;
关键词
IONIZATION-MASS-SPECTROMETRY; JURA MOUNTAINS; YOUNGER DRYAS; EARLY EOCENE; PALEOCLIMATE RECONSTRUCTION; METHANOGEN COMMUNITIES; ENVIRONMENTAL CONTROLS; OMBROTROPHIC PEAT; RADIOCARBON-DATES; DELTA-D;
D O I
10.1016/j.orggeochem.2011.03.013
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Peatlands are widespread and important natural archives of environmental change. Here we explore the potential of the recently introduced MBT-CBT proxy (methylation index and cyclisation ratio of branched tetraethers) to estimate past annual mean air temperature (MAT) based on the distribution of bacterially-derived branched glycerol dialkyl glycerol tetraether (GDGT) membrane lipids in peat and coal. To this end, branched GDGTs in an ombrotrophic peat bog from Switzerland and three coal deposits of increasing maturity were analysed. For the surface of the bog, reconstructed annual MAT is higher than both measured annual MAT and measured in situ pore water temperature. Changes in the CBT ratio, considered a proxy for pH, with depth in the bog do not match with present day in situ pore water pH, but coincide with a peat stratigraphic boundary. This indicates that GDGTs down the bog profile are predominantly fossil and not derived from extant biomass. The MBT-CBT derived annual MAT record also shows a large drop at this stratigraphic boundary, which likely relates to past change in trophic status of the bog. Branched GDGTs are abundant in an immature lignite (vitrinite reflectance, R-o 0.25%), but occur in low amount in a slightly more mature coal (R-o 0.32%). Annual MAT could be reconstructed for the lignite alone and is higher than other proxy-based estimates from approximately the same time and location. Our results indicate potential for the application of the MBT-CBT proxy in peat and immature coals, but improved constraints on the effects of different types of peat on branched GDGT distributions as well as improved calibration of MAT estimates are needed before the method can be confidently applied. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:477 / 486
页数:10
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