Agirrezabala, Luis M. Permanyer, Albert Suárez-Ruiz, Isabel Dorronsoro, Carmen
Published in
Organic Geochemistry
Recent studies have documented the expulsion of methane and oil to the Albian paleoseabed in the Basque-Cantabrian Basin. They interpret that hydrocarbon generation and expulsion were triggered by seismically recorded magmatic intrusions which metamorphosed organic-rich host sediments. An outcrop within the basin was selected to investigate organic...
van Soelen, E.E. Lammers, J.M. Eglinton, T.I. Sinninghe Damsté, J.S. Reichart, G.J.
Published in
Organic Geochemistry
Unusual C35 to C38 alkenones were identified in mid-Holocene (8–3.5kyr BP) sediments from a restricted estuary in southwest Florida (Charlotte Harbor). The distribution was dominated by a C36 diunsaturated (ω15,20) ethyl ketone, identical to the one present in Black Sea Unit 2 sediments. Other unusual alkenones were tentatively assigned as a C35:2 ...
Bauersachs, Thorsten Stal, Lucas J. Grego, Michele Schwark, Lorenz
Published in
Organic Geochemistry
We investigated the effect of temperature on the heterocyst glycolipid (HG) composition of the diazotrophic heterocystous cyanobacteria Anabaena sp. strain CCY9613 and Nostoc sp. strain CCY9926 grown at 9, 12, 16, 20 and 24°C. Both strains contained an overall similar composition of heterocyst glycolipids, with 1-(O-hexose)-3,25-hexacosanediols (HG...
Huang, Xianyu Xue, Jiantao Meyers, Philip A. Gong, Linfeng Wang, Xinxin Liu, Qiao Qin, Yangmin Wang, Hongmei
Published in
Organic Geochemistry
Symbiotic methanotrophic bacteria are prevalent on the stems or in the hyaline cells of Sphagnum spp. in peat-moss ecosystems and can contribute a significant amount of isotopically light carbon for moss photosynthesis. Despite this, the influence of the methanotrophs on the δ13C values of Sphagnum-derived lipids is poorly known, especially in peat...
Xia, Xinyu
Published in
Organic Geochemistry
A kinetic compositional model covering the generation of methane through pentanes is calibrated with both experimental and field data. A continuous distribution of activation energy (E=E0+yEs) is applied to describe the heterogeneity of hydrocarbon generation kinetics, with E0 (activation energy E at conversion y=0) as the location parameter and Es...
Pomerantz, Andrew E. Bake, Kyle D. Craddock, Paul R. Kurzenhauser, Kurt W. Kodalen, Brian G. Mitra-Kirtley, Sudipa Bolin, Trudy B.
Published in
Organic Geochemistry
The chemical and physical structure of immobile organic matter partially controls both the thermal evolution of organic rich shales and hydrocarbon production from these unconventional fossil fuel resources. This organic matter is typically classified into two fractions: kerogen, which is defined as insoluble in organic solvent and bitumen, which i...
Published in
Organic Geochemistry
Kiepper, Angélica P. Casilli, Alessandro Azevedo, Débora A.
Published in
Organic Geochemistry
Comprehensive two-dimensional gas chromatography (GC×GC) coupled to time of flight mass spectrometry (TOFMS), currently one of the most powerful analytical tools that can separate mixtures at a high resolution, was applied to a suite of Brazilian crude oils. The oils were selected based on their different sources, similar maturity levels and little...
Gao, Ling Schimmelmann, Arndt Tang, Yongchun Mastalerz, Maria
Published in
Organic Geochemistry
Pyrolysis experiments on type II kerogen with maturities equivalent to vitrinite reflectance (Ro) between 0.7% and 1.4% were conducted in the presence and absence of added water to determine whether the isotope rollover effect observed in natural highly productive shale gas plays can be reproduced in the laboratory. Isotope rollover occurs when iso...
Olofsson, Jörgen Hickler, Thomas
Published in
Vegetation History and Archaeobotany
Humanity has become a major player within the Earth system, particularly by transforming large parts of the land surface and by altering the gaseous composition of the atmosphere. Deforestation for agricultural purposes started thousands of years ago and might have resulted in a detectable human influence on climate much earlier than the industrial...
