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Source, composition, and distributional pattern of branched tetraethers in sediments of northern Chinese marginal seas

期刊: ORGANIC GEOCHEMISTRY, 2021; 157 ()

Branched glycerol dialkyl glycerol tetraethers (brGDGTs), biomarkers for organic carbon source and paleoenvironment, can be produced in both land and ......

Unravelling the impact of lithofacies on the composition of NSO compounds in residual and expelled fluids of the Barnett, Niobrara and Posidonia formations

期刊: ORGANIC GEOCHEMISTRY, 2021; 155 ()

The influence of lithofacies on the composition of NSO (nitrogen-, sulfur-and oxygen-containing) compounds in unconventional petroleum systems has bee......

Extended series of tricyclic terpanes in the Mesoproterozoic sediments

期刊: ORGANIC GEOCHEMISTRY, 2021; 156 ()

Analysis of Mesoproterozoic sediment extracts from the North China Craton by gas chromatography-mass spectrometry metastable reaction monitoring revea......

Appraisal of paleoclimate indices based on bacterial 3-hydroxy fatty acids in 20 Chinese alkaline lakes

期刊: ORGANIC GEOCHEMISTRY, 2021; 160 ()

Bacterial 3-hydroxy fatty acids (3-OH-FAs) show potential for terrestrial paleoclimate reconstruction; however, the possibility of using 3-OH-FAs as p......

Carbon and hydrogen isotope fractionation during aerobic oxidation of short-chain alkanes in experimental incubations of vent fluids

期刊: ORGANIC GEOCHEMISTRY, 2021; 158 ()

Aerobic oxidation of short-chain alkanes was observed in gas samples from the Lutao intertidal hydrothermal vents in Taiwan, during storage at 20 degr......

Geochemical significance of beta-carotane in lacustrine oils from the Shahejie Formation of the Dongying Depression, eastern China

期刊: ORGANIC GEOCHEMISTRY, 2021; 156 ()

Oils reservoired in the third (Es3) and fourth (Es4) members of the lacustrine Shahejie Formation from the Dongying Depression, Bohai Bay Basin, easte......

Fluorescence lifetime evolution of crude oils during thermal cracking: Implications from pyrolysis experiments in a closed system

期刊: ORGANIC GEOCHEMISTRY, 2021; 159 ()

In this study, pyrolysis experiments were performed on two crude oils with different origins in a closed system, and the pyrolyzed oils were then anal......

Comparison of molecular distributions and carbon and hydrogen isotope compositions of n-alkanes from aquatic plants in shallow freshwater lakes along the middle and lower reaches of the Yangtze River, China

期刊: ORGANIC GEOCHEMISTRY, 2021; 158 ()

Leaf wax n-alkanes in lacustrine sequences have been widely applied for reconstructions of Late Quaternary paleoclimate histories. Such applications d......

Molecular and carbon isotopic evidence of pigments indicating a dynamic oceanic chemocline 1.4 billion years ago in northern China

期刊: ORGANIC GEOCHEMISTRY, 2021; 154 ()

The redox state of the marine photic zone is crucial to the evolution of life, which is further linked to the degree of oxygenation of the atmosphere ......

Bacteriohopanepolyols signature in sediments of the East China Sea and its indications for hypoxia and organic matter sources

期刊: ORGANIC GEOCHEMISTRY, 2021; 158 ()

The bacterial biomarker group of bacteriohopanepolyols (BHPs) has shown a significant potential to track terrestrial inputs and to respond to environm......

Thermal evolution of steroids during anhydrous pyrolysis of cholesterol with and without elemental sulfur

期刊: ORGANIC GEOCHEMISTRY, 2021; 157 ()

Steroids are widely used in geochemical studies. They are common in living organisms, sediments and petroleum, and the diagenetic pathways of steroida......

Methane generation from low-maturity coals and shale source rocks at low temperatures (80-120 degrees C) over 14-38 months

期刊: ORGANIC GEOCHEMISTRY, 2021; 155 ()

This study contributes long-term (14 to 38 months) experimental evidence for geocatalytically mediated methanogenesis in immature to early mature shal......

Novel methyl-branched alkenones with up to five double bonds in saline lakes

期刊: ORGANIC GEOCHEMISTRY, 2021; 156 ()

Long-chain alkenones, a class of highly specific and widely used lipid biomarkers found in ocean and lake sediments, have been so far found as straigh......

Diamondoids in petroleum: Their potential as source and maturity indicators

期刊: ORGANIC GEOCHEMISTRY, 2021; 160 ()

Assessing the origins and thermal maturity of oils is an important issue in applied petroleum geochemistry. In this study, we extracted information re......

Distribution and carbon isotope composition of pregnane in carbonate-evaporitic rocks from the Bonan Sag, Bohai Bay Basin, Eastern China: Insights into sources and associated lake environments

期刊: ORGANIC GEOCHEMISTRY, 2021; 151 ()

The distribution and carbon isotope composition of pregnane was determined in eight samples of carbonate-evaporitic rock collected from depths of 2938......

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