Organic geochemistry of recent sediments from Guaymas Basin, Gulf of California

Simoneit, Bernd R.T.; Mazurek, Monica A.; Brenner, S.; Crisp, P.T.; Kaplan, I. R.

doi:10.1016/0198-0149(79)90102-x

Cited by 147 publications

(65 citation statements)

References 15 publications

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“…2). The higher homologs (> C=) indicate a terrestrial source (Simoneit et al, 1979). The close similarity between the distributions of the n-alkanes and the n-alkan-2-ones series in both lignite samples supports a diagenetic relationship as proposed by Cranwell et al (1987) for both series.…”

Section: Aliphatic Ketones and Aldehydessupporting

confidence: 51%

Variation in the content and distribution of biomarkers in two closely situated peat and lignite deposits

Rı́o

Vila

Martı́n

1992

Organic Geochemistry

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Abstract--A peat and two lignite samples taken from closely situated deposits in the Granada Basin (South Spain) were analysed for their lipid composition. Variations in the distributions and abundances of various compound classes including normal, branched and unsaturated fatty acids, aliphatic hydrocarbons, aliphatic and steroid alcohols and ketones, aldehydes, diterpenoids and triterpenoids suggest that a gradient in maturity exists among the samples indicating that the lignites were generally more mature than the peat. In spite of their similar rank, a different hopane distribution was observed between both lignite samples. Source materials include contributions from terrigenous (coniferous) higher plants as well as microbial sources. A possible contribution from marine phytoplankton can also be inferred in the lignite on the basis of the sterol distribution.

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Section: Aliphatic Ketones and Aldehydessupporting

confidence: 51%

Variation in the content and distribution of biomarkers in two closely situated peat and lignite deposits

Rı́o

Vila

Martı́n

1992

Organic Geochemistry

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“…3). These values compare with the mean (δ 13 C = -71‰) for CH 4 in surface sediments at station 30G in the northern rift (Simoneit et al, 1979). Farther down, the isotopic composition of methane varies approximately around the mean.…”

Section: Guaymas Basinmentioning

confidence: 89%

“…In the upper part of the sequence, the methane has a δ 13 C value ( Fig. 1) typical for gases of a microbiological origin (δ 13 C = -75%) (Galimov, 1975;Simoneit et al, 1979). But in the zone with the high concentration of ethane, the methane is enriched in the 13 C isotope, and downward in the sequence it again becomes isotopically lighter (Fig.…”

Section: Mouth Of the Gulfmentioning

confidence: 99%

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Галимов¹,

Simoneit²

1982

Initial Reports of the Deep Sea Drilling Project

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We analyzed interstitial gases from holes at Sites 474, 477, 478, 479, and 481 in the Gulf of California, using gas chromatography and stable isotope mass spectrometry to evaluate their composition in terms of biogenic and thermogenic sources. The hydrocarbon gas (C1-C5) concentrations were comparable to the shipboard data, and no olefins could be detected. The δ 13 C data for the CH 4 confirmed the effects of thermal stress on the sedimentary organic matter, because the values were typically biogenic near the surface and became more depleted in 12 C versus depth in holes at Sites 474, 478, and 481. The CH 4 at Site 477 was the heaviest, and in Hole 479 it did not show a dominant hightemperature component. The CO 2 at depth in most holes was mostly thermogenic and derived from carbonates. The low concentrations of C 2 -C 5 hydrocarbons in the headspace gas of canned sediments precluded a stable carbon-isotope analysis of their genetic origin.

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“…Immature precursors. Immature biomarkers occur in lowtemperature regions of sedimentary hydrothermal systems, and maturation is observed with an increasing temperature and depth below the seafloor (sub-bottom depth) (Simoneit et al, 1979(Simoneit et al, , 1984Brault, Simoneit, & Novelli, 1988;Simoneit, 1994;Rushdi & Simoneit, 2002a,b). Sterols (I) are major components in unaltered sedimentary sections, and range from C 27 to C 29 , with cholesterol (I, R ¼ H) dominant or equal to b-sitosterol (I, R ¼ C 2 H 5 ).…”

Section: Petroleum Biomarkersmentioning

confidence: 99%

A review of current applications of mass spectrometry for biomarker/molecular tracer elucidations

Simoneit

2004

Mass Spectrometry Reviews

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129

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Mass spectrometry, especially coupled with gas chromatography or tandem, is the analytical method of choice in elucidations of biomarker compounds present in organic mixtures extracted from geological, environmental, or biological samples. This review describes the biomarker concept; i.e., the precursor natural products to the geological/environmental derivatives, and their application as tracers in the geosphere and ambient environment. The mass spectrometric methods currently utilized for such analyses are reviewed, and typical examples of applications are described with a general key to the literature. © 2004 Wiley Periodicals, Inc., Mass Spec Rev 24:719–765, 2005

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Organic geochemistry of recent sediments from Guaymas Basin, Gulf of California

Cited by 147 publications

References 15 publications

Variation in the content and distribution of biomarkers in two closely situated peat and lignite deposits

Variation in the content and distribution of biomarkers in two closely situated peat and lignite deposits

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

A review of current applications of mass spectrometry for biomarker/molecular tracer elucidations

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