Tetracyclic polyprenoids; indicators of freshwater (lacustrine) algal input

Because of the great variety of lacustrine-source depositional characteristics and biological consortia, identification of a universally applicable indicator of freshwater or brackish-water organic input for crude oils and rock extracts has proven elusive. Tetracyclic polyprenoid compounds (TPP) are...

Full description

Saved in:
Bibliographic Details
Published in:Geology (Boulder) 2000-03, Vol.28 (3), p.251-254
Main Authors: Holba, Albert G, Tegelaar, Erik, Ellis, Leroy, Singletary, M. S, Albrecht, Pierre
Format: Article
Language:English
Subjects:
Algae
biogenic processes
biomarkers
brackish-water environment
depositional environment
Economic geology
energy sources
experimental studies
fresh-water environment
gas chromatograms
geochemical indicators
geochemistry
Geology
hydrocarbons
lacustrine environment
mass spectra
organic compounds
petroleum
Plantae
polyprenoids
rock, sediment, soil
sedimentary rocks
source rocks
spectra
steranes
tetracyclic polyprenoids
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Because of the great variety of lacustrine-source depositional characteristics and biological consortia, identification of a universally applicable indicator of freshwater or brackish-water organic input for crude oils and rock extracts has proven elusive. Tetracyclic polyprenoid compounds (TPP) are present in relatively high concentrations in oils and associated source rocks deposited under freshwater or brackish-water conditions, but typically are present in relatively low concentrations in samples from marine or coal-forming depositional environments. A TPP ratio, constructed from the gas chromatography-tandem mass spectrometry peak areas of a C30 tetracyclic polyprenoid divided by the sum of the peak areas of the C26 27-norcholestanes, revealed great specificity in identifying freshwater or brackish-water algal input, particularly in crude oils.
ISSN:0091-7613
1943-2682
DOI:10.1130/0091-7613(2000)28<251:TPIOFL>2.0.CO;2