Browsing ELibrary by Author "Freeman K.H."

Now showing items 1-7 of 7

CARBON ISOTOPE GEOCHEMISTRY OF THE FRASNIAN-FAMENNIAN TRANSITION

Joachimski M.M.; Pancost R.D.; Freeman K.H.; Ostertag-Henning C.; Buggisch W. (2002)

Carbon isotope records for inorganic and total organic carbon (TOC) as well as for individual organic biomarkers show two positive excursions in the Late Frasnian with comparable shape and amplitude in δ13C. The positive ...
DIFFERENT RESPONSE OF δD VALUES OF N-ALKANES, ISOPRENOIDS, AND KEROGEN DURING THERMAL MATURATION

Pedentchouk N.; Freeman K.H.; Harris N.B. (2006)

This study investigates the extent of post-depositional alteration of δD values of n-alkyl lipids, isoprenoids, and kerogen isolated from a continuous 450 m core that covers the transition from thermally immature to early ...
GAS CHROMATOGRAPHY-PYROLYSIS-ISOTOPE RATIO MASS SPECTROMETRY: A NEW METHOD FOR INVESTIGATING INTRAMOLECULAR ISOTOPIC VARIATION IN LOW MOLECULAR WEIGHT ORGANIC ACIDS

Dias R.F.; Freeman K.H.; Franks S.G. (2002)

A new GC-Pyrolysis-IRMS method was developed for the δ13C determination of carboxyl carbon in low-molecular weight organic acids. By utilizing a palladium-wire reactor at 600<space>°C with a helium/hydrogen reactant gas, ...
INFLUENCE OF PHYSIOLOGY AND CLIMATE ON δD OF LEAF WAX N-ALKANES FROM C3 AND C4 GRASSES

Smith F.A.; Freeman K.H. (2006)

We measured hydrogen isotope compositions (δD) of high-molecular-weight n-alkanes (C27-C33) from grasses grown in greenhouses and collected from the US Great Plains. In both cases, n-alkanes from C4 grasses are enriched ...
ISOTOPE ANALYSES OF MOLECULAR AND TOTAL ORGANIC CARBON FROM MIOCENE SEDIMENTS - WAX ESTERS, STERYL ESTERS, TRIACYLGLYCEROLS AND ALKYLDIACYLGLYCEROLS

Pagani M.; Freeman K.H.; Arthur M.A. (2000)

Carbon-isotope compositions of n-alkanes, pristane and phytane, and total organic carbon were measured and compared against isotopic trends of coeval alkadienones from Miocene sediments containing very low organic-carbon ...
ISOTOPIC BIOGEOCHEMISTRY OF MARINE ORGANIC CARBON

Freeman K.H. (2001)

The ocean accounts for over 90% of the active pools of carbon on the Earth’s surface, with over 95% of marine carbon in the form of dissolved inorganic carbon (DIC) (Hedges and Keil 1995). Organic carbon dissolved in the ...
δ13C OF LOW-MOLECULAR-WEIGHT ORGANIC ACIDS GENERATED BY THE HYDROUS PYROLYSIS OF OIL-PRONE SOURCE ROCKS

Dias R.F.; Freeman K.H.; Lewan M.D.; Franks S.G. (2002)

Low-molecular-weight (LMW) aqueous organic acids were generated from six oil-prone source rocks under hydrous-pyrolysis conditions. Differences in total organic carbon-normalized acid generation are a function of the initial ...

Browsing ELibrary by Author "Freeman K.H."

Browsing ELibrary by Author "Freeman K.H."

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