Changes in 14C Activity over Time During Vacuum Distillation of Carbon from Rock Pore Water
Issue Date
1999-01-01Keywords
water contentdiffusion
adsorption
matrix
Miocene
Topopah Spring Member
tuff
vacuum distillation methods
Yucca Mountain
Nye County Nevada
Neogene
temperature
pore water
Tertiary
Nevada
isotope ratios
igneous rocks
pyroclastics
volcanic rocks
United States
Cenozoic
methods
C 14
carbon
isotopes
radioactive isotopes
C 13 C 12
stable isotopes
absolute age
Metadata
Show full item recordCitation
Davidson, G. R., & Yang, I. C. (1999). Changes in 14C activity over time during vacuum distillation of carbon from rock pore water. Radiocarbon, 41(2), 141-148.Journal
RadiocarbonAdditional Links
http://radiocarbon.webhost.uits.arizona.edu/Abstract
The radiocarbon activity of carbon collected by vacuum distillation from a single partially saturated tuff began to decline after approximately 60% of the water and carbon had been extracted. Disproportionate changes in 14C activity and delta-13C during distillation rule out simple isotopic fractionation as a causative explanation. Additional phenomena such as matrix diffusion and ion exclusion in micropores may play a role in altering the isotopic value of extracted carbon, but neither can fully account for the observed changes. The most plausible explanation is that distillation recovers carbon from an adsorbed phase that is depleted in 14C relative to DIC in the bulk pore water.Type
Articletext
Language
enISSN
0033-8222ae974a485f413a2113503eed53cd6c53
10.1017/S0033822200019494