Browsing ELibrary by Author "Farquhar J."

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A 33S ENRICHMENT IN UREILITE METEORITES: EVIDENCE FOR A NEBULAR SULFUR COMPONENT

Farquhar J.; Jackson T.L.; Thiemens M.H. (2000)

Acid volatile sulfur extracted from ureilite meteorites carries a small 33S enrichment relative to carbonaceous chondrites, enstatite chondrites, ordinary chondrites, and troilite from iron meteorites: Δ33S (=δ33S - 1,000 ...
CARBONATES IN CM2 CHONDRITES: CONSTRAINTS ON ALTERATION CONDITIONS FROM OXYGEN ISOTOPIC COMPOSITIONS AND PETROGRAPHIC OBSERVATIONS

Benedix G.K.; Leshin L.A.; Farquhar J.; Jackson T.; Thiemens M.H. (2003)

High-precision measurements of the oxygen isotopic compositions of carbonates (calcite and dolomite) from five CM2 chondrites are presented and put into context of the previously determined mineralogic alteration index ...
COMPARISON OF OXYGEN ISOTOPE DATA OBTAINED BY LASER FLUORINATION OF OLIVINE WITH KRF EXCIMER LASER AND CO2 LASER

Farquhar J.; Rumble D. (1998)

The physics and chemistry of laser fluorination techniques that rely on CO2 lasers and excimer lasers differ on several fundamental levels: the mechanisms of laser-sample coupling, the time-scales of the interactions, and ...
IN SITU OXYGEN ISOTOPE ANALYSIS WITH AN EXCIMER LASER USING F2 AND BRF5 REAGENTS AND O2 GAS AS ANALYTE

Rumble D.; Farquhar J.; Young E.D.; Christensen C.P. (1997)

In situ oxygen isotope analysis of silicate minerals has been validated by interlaboratory calibration using an excimer laser (KrF fill gas, 248 nm), F2 gas fluorinating reagent, and O2 gas as mass spectrometer analyte. A ...
MASS-DEPENDENT FRACTIONATION OF QUADRUPLE STABLE SULFUR ISOTOPE SYSTEM AS A NEW TRACER OF SULFUR BIOGEOCHEMICAL CYCLES

Ono S.; Wing B.; Johnston D.; Farquhar J.; Rumble D. (2006)

Sulfur isotope studies of post-Archean terrestrial materials have focused on the ratio 34S/32S because additional isotopes, 33S and 36S, were thought to carry little information beyond the well-known mass-dependent ...
MULTIPLE SULFUR ISOTOPES AND THE EVOLUTION OF THE ATMOSPHERE

Farquhar J.; Wing B.A. (2003)

Interest in multiple sulfur isotope analyses has been fueled by recent reports of mass-independent sulfur isotope signatures in the geologic record. A non-zero multiple isotopic signature of sulfur (Δ33S and Δ36S) is ...
PLANETESIMAL SULFATE AND AQUEOUS ALTERATION IN CM AND CI CARBONACEOUS CHONDRITES

Airieau S.A.; Farquhar J.; Thiemens M.H.; Leshin L.A.; Bao H.; Young E. (2005)

Water-soluble sulfate salts extracted from six CM chondrites have oxygen isotope compositions that are consistent with an extraterrestrial origin. The Δ17O of sulfate are correlated with previously reported whole rock δ18O ...
TEMPERATURES OF GRANULITE-FACIES METAMORPHISM: CONSTRAINTS FROM EXPERIMENTAL PHASE EQUILIBRIA AND THERMOBAROMETRY CORRECTED FOR RETROGRADE EXCHANGE

Pattison D.R.M.; Chacko T.; Farquhar J.; McFarlane C.R.M. (2003)

This study assesses temperatures of formation of common granulites by combining experimental constraints on the P–T stability of granulite-facies mineral associations with a garnet–orthopyroxene (Grt–Opx) thermobarometry ...

Browsing ELibrary by Author "Farquhar J."

Browsing ELibrary by Author "Farquhar J."

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