Search Results - "Organic geochemistry"

Revised genetic diagrams for natural gases based on a global dataset of >20,000 samples by Milkov, Alexei V., Etiope, Giuseppe

“…•Revised genetic diagrams for natural gases based on 20,621 samples.•Early mature thermogenic gas may have methane depleted in 13C (δ13C around −75‰).•Late…”
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Advances in the application of amino acid nitrogen isotopic analysis in ecological and biogeochemical studies by Ohkouchi, Naohiko, Chikaraishi, Yoshito, Close, Hilary G., Fry, Brian, Larsen, Thomas, Madigan, Daniel J., McCarthy, Matthew D., McMahon, Kelton W., Nagata, Toshi, Naito, Yuichi I., Ogawa, Nanako O., Popp, Brian N., Steffan, Shawn, Takano, Yoshinori, Tayasu, Ichiro, Wyatt, Alex S.J., Yamaguchi, Yasuhiko T., Yokoyama, Yusuke

“…•This review investigates the sources, cycling, and trophic modification of nitrogen.•δ15N values of amino acids are useful for estimating trophic positions of…”
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Is organic pore development in gas shales influenced by the primary porosity and structure of thermally immature organic matter? by Löhr, S.C., Baruch, E.T., Hall, P.A., Kennedy, M.J.

“…•SEM imaging shows primary OM-hosted pores are common in thermally immature shales.•OM pores occur in immature and gas-mature samples, but not in oil-mature…”
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Extracting the most from terrestrial plant-derived n-alkyl lipids and their carbon isotopes from the sedimentary record: A review by Diefendorf, Aaron F., Freimuth, Erika J.

“…•Plant wax components are used for paleoclimate, paleovegetation, and carbon cycle reconstruction.•The δ13C values are influenced by fractionation during…”
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Distributions of 5- and 6-methyl branched glycerol dialkyl glycerol tetraethers (brGDGTs) in East African lake sediment: Effects of temperature, pH, and new lacustrine paleotemperature calibrations by Russell, James M., Hopmans, Ellen C., Loomis, Shannon E., Liang, Jie, Sinninghe Damsté, Jaap S.

“…•Distributions of 5- and 6-methyl brGDGTs were measured in African lakes.•Distributions of 5- and 6-methyl brGDGTs differ in lakes, peats, and soils.•Relative…”
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The effect of improved chromatography on GDGT-based palaeoproxies by Hopmans, Ellen C., Schouten, Stefan, Sinninghe Damsté, Jaap S.

“…•New chromatographic method for improved separation of GDGTs.•New method was tested on global calibration set of the TEX86, MBT5ME and CBT′.•Small offset for…”
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Centers of organic carbon burial and oxidation at the land-ocean interface by Bianchi, Thomas S., Cui, Xingqian, Blair, Neal E., Burdige, David J., Eglinton, Timothy I., Galy, Valier

“…Continental margin systems collectively receive and store vast amounts of organic carbon (OC) derived from primary productivity both on land and in the ocean,…”
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Effect of organic-matter type and thermal maturity on methane adsorption in shale-gas systems by Zhang, Tongwei, Ellis, Geoffrey S., Ruppel, Stephen C., Milliken, Kitty, Yang, Rongsheng

“…► Organic matter is the key element to control gas adsorption in shales. ► TOC is a primary control on gas adsorption capacity. ► Organic-matter type and…”
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Organic porosity: A geochemist's view of the current state of understanding by Katz, Barry Jay, Arango, Irene

“…•Inconsistent terminology used by practitioners working on organic porosity has complicated its study.•Multiple mechanisms appear responsible for organic…”
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The organic geochemistry of glycerol dialkyl glycerol tetraether lipids: A review by Schouten, Stefan, Hopmans, Ellen C., Sinninghe Damsté, Jaap S.

“…► Glycerol dialkyl glycerol tetraethers (GDGTs) have become increasingly popular biomarker lipids in organic geochemistry. ► They have applications in both…”
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Geochemistry of the extremely high thermal maturity Longmaxi shale gas, southern Sichuan Basin by Dai, Jinxing, Zou, Caineng, Liao, Shimeng, Dong, Dazhong, Ni, Yunyan, Huang, Jinliang, Wu, Wei, Gong, Deyu, Huang, Shipeng, Hu, Guoyi

“…•Longmaxi shale gas has highest content (95.5–99.6%) and δ13C of CH4 in the world.•The Longmaxi shale gas is characterized by δ13C1>δ13C2>δ13C3 and…”
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An overview of the occurrence of ether- and ester-linked iso-diabolic acid membrane lipids in microbial cultures of the Acidobacteria: Implications for brGDGT paleoproxies for temperature and pH by Sinninghe Damsté, Jaap S., Rijpstra, W. Irene C., Foesel, Bärbel U., Huber, Katharina J., Overmann, Jörg, Nakagawa, Satoshi, Kim, Joong Jae, Dunfield, Peter F., Dedysh, Svetlana N., Villanueva, Laura

“…•Only 2 out of 46 acidobacterial strains representing 7 subdivisions contain brGDGTs.•Strains of SDs 1, 3, 4, and 6 produce their building block, i.e…”
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Lipid biomarker temperature proxy responds to abrupt shift in the bacterial community composition in geothermally heated soils by De Jonge, Cindy, Radujković, Dajana, Sigurdsson, Bjarni D., Weedon, James T., Janssens, Ivan, Peterse, Francien

“…•BrGDGTs were measured in geothermal soils to determine the unique effect of warming.•Here, brGDGT lipids only respond to temperature when the bacterial…”
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Source-specific biomarkers as proxies for Arctic and Antarctic sea ice by Belt, Simon T.

“…•Source-specific highly branched isoprenoid (HBI) biomarkers as sea ice proxies.•IP25 and IPSO25 are proxies for Arctic and Antarctic sea ice, respectively.•A…”
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Properties of fluorescent dissolved organic matter in the Gironde Estuary by Huguet, A., Vacher, L., Relexans, S., Saubusse, S., Froidefond, J.M., Parlanti, E.

“…The isolation, characterization and study of the properties of aquatic dissolved organic matter (DOM) still represent a challenge because of the heterogeneity,…”
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Polycyclic aromatic hydrocarbons (PAHs) in biochar – Their formation, occurrence and analysis: A review by Wang, Congying, Wang, Yingdi, Herath, H.M.S.K.

“…[Display omitted] •Review of research progress on PAHs in biochar.•Pyrolysis process is the most key factor for PAH formation and yield.•Slow pyrolysis and…”
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Geochemistry of shale gases from around the world: Composition, origins, isotope reversals and rollovers, and implications for the exploration of shale plays by Milkov, Alexei V., Faiz, Mohinudeen, Etiope, Giuseppe

“…•Gases produced from most commercially successful shale plays are thermogenic.•Formations with greater gas endowment contain late-mature thermogenic gas.•Plays…”
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Aromaticity and degree of aromatic condensation of char by Wiedemeier, Daniel B., Abiven, Samuel, Hockaday, William C., Keiluweit, Marco, Kleber, Markus, Masiello, Caroline A., McBeath, Anna V., Nico, Peter S., Pyle, Lacey A., Schneider, Maximilian P.W., Smernik, Ronald J., Wiesenberg, Guido L.B., Schmidt, Michael W.I.

“…[Display omitted] •Measurements from 38 laboratory chars using 7 characterization methods were compared.•Most measurements captured the aromaticity or aromatic…”
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Methane clumped isotopes: Progress and potential for a new isotopic tracer by Douglas, Peter M.J., Stolper, Daniel A., Eiler, John M., Sessions, Alex L., Lawson, Michael, Shuai, Yanhua, Bishop, Andrew, Podlaha, Olaf G., Ferreira, Alexandre A., Santos Neto, Eugenio V., Niemann, Martin, Steen, Arne S., Huang, Ling, Chimiak, Laura, Valentine, David L., Fiebig, Jens, Luhmann, Andrew J., Seyfried, William E., Etiope, Giuseppe, Schoell, Martin, Inskeep, William P., Moran, James J., Kitchen, Nami

“…•We present a review and an expanded dataset of methane clumped isotope measurements.•Methane clumped isotope values often indicate equilibrium formation…”
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Adsorptive fractionation of dissolved organic matter (DOM) by mineral soil: Macroscale approach and molecular insight by Avneri-Katz, Shani, Young, Robert B., McKenna, Amy M., Chen, Huan, Corilo, Yuri E., Polubesova, Tamara, Borch, Thomas, Chefetz, Benny

“…•DOM adsorptive fractionation by mineral soil observed at molecular level.•Adsorption of hydrophobic acid fraction to soil dominant.•Polyphenols and…”
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