Skip to main content

Main menu

  • Home
  • Content
    • Current
    • Archive
    • Special Volumes and Special Issue
  • Subscriptions
    • Subscribers
    • Pricing
    • FAQ
    • Terms & Conditions for use of AJS Online
  • Instructions to Authors
  • Site Features
    • Alerts
    • Feedback
    • Usage Statistics
    • RSS
  • About Us
    • Editorial Board
    • The Journal

User menu

  • Register
  • Subscribe
  • My alerts
  • Log in
  • My Cart

Search

  • Advanced search
American Journal of Science
  • Register
  • Subscribe
  • My alerts
  • Log in
  • My Cart
American Journal of Science

Advanced Search

  • Home
  • Content
    • Current
    • Archive
    • Special Volumes and Special Issue
  • Subscriptions
    • Subscribers
    • Pricing
    • FAQ
    • Terms & Conditions for use of AJS Online
  • Instructions to Authors
  • Site Features
    • Alerts
    • Feedback
    • Usage Statistics
    • RSS
  • About Us
    • Editorial Board
    • The Journal
  • Follow ajs on Twitter
  • Visit ajs on Facebook
Research ArticleArticles

Clumped isotopic equilibrium and the rate of isotope exchange between CO2 and water

Hagit P. Affek
American Journal of Science April 2013, 313 (4) 309-325; DOI: https://doi.org/10.2475/04.2013.02
Hagit P. Affek
Department of Geology and Geophysics, Yale University, 210 Whitney Ave., New Haven, Connecticut, 06511, USA; phone: 203-432-3761, email:
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: hagit.affek@yale.edu
  • Article
  • Figures & Data
  • References
  • Info & Metrics
  • PDF
Loading

Abstract

The reaction of CO2 hydration/dehydration controls the oxygen isotopic composition in both carbonate minerals and atmospheric CO2 through the exchange of oxygen isotopes with water. The use of δ18O as an environmental indicator typically assumes isotopic equilibrium, namely full oxygen isotope exchange between CO2 and water. Clumped isotopes is a new isotopic tracer that is used in both CaCO3 and atmospheric CO2 and reflects the thermodynamic preference of two heavy isotopes, 13C and 18O in this case (given as Δ47), to “clump” together into one chemical bond at low temperatures. As such, the use of Δ47 as an indicator for temperature relies on the assumption of isotopic equilibrium. The experiments presented here examine the rate in which Δ47 of CO2 that interact with water approaches the equilibrium values. This rate is indistinguishable between Δ47 and δ18O, suggesting that the isotope exchange with water also leads to reorganization of the isotopes among CO2 isotopologues thus controlling the Δ47 values. The direct implication of the temporal link between Δ47 and δ18O is that when one isotopic system shows disequilibrium, either in DIC or in gas phase CO2, so will the other. As CO2 clumped isotope values are independent of the oxygen isotopic composition of the water participating in the reaction, disequilibrium in Δ47 is often identified more readily than in δ18O. The combination of clumped isotopes and oxygen isotopes is therefore likely to elucidate cases of suspected disequilibrium also in δ18O (and vice versa).

  • CO2 hydration/dehydration
  • clumped and oxygen isotopes
View Full Text

This article requires a subscription to view the full text. If you have a subscription you may use the login form below to view the article. Access to this article can also be purchased.

Log in using your username and password

Forgot your user name or password?

Purchase access

You may purchase access to this article. This will require you to create an account if you don't already have one.
PreviousNext
Back to top

In this issue

American Journal of Science: 313 (4)
American Journal of Science
Vol. 313, Issue 4
1 Apr 2013
  • Table of Contents
  • Table of Contents (PDF)
  • About the Cover
  • Index by author
  • Ed Board (PDF)
Print
Download PDF
Article Alerts
Sign In to Email Alerts with your Email Address
Email Article

Thank you for your interest in spreading the word on American Journal of Science.

NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. We do not capture any email address.

Enter multiple addresses on separate lines or separate them with commas.
Clumped isotopic equilibrium and the rate of isotope exchange between CO2 and water
(Your Name) has sent you a message from American Journal of Science
(Your Name) thought you would like to see the American Journal of Science web site.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
1 + 7 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.
Citation Tools
Clumped isotopic equilibrium and the rate of isotope exchange between CO2 and water
Hagit P. Affek
American Journal of Science Apr 2013, 313 (4) 309-325; DOI: 10.2475/04.2013.02

Citation Manager Formats

  • BibTeX
  • Bookends
  • EasyBib
  • EndNote (tagged)
  • EndNote 8 (xml)
  • Medlars
  • Mendeley
  • Papers
  • RefWorks Tagged
  • Ref Manager
  • RIS
  • Zotero
Share
Clumped isotopic equilibrium and the rate of isotope exchange between CO2 and water
Hagit P. Affek
American Journal of Science Apr 2013, 313 (4) 309-325; DOI: 10.2475/04.2013.02
del.icio.us logo Digg logo Reddit logo Twitter logo Facebook logo Google logo Mendeley logo
  • Tweet Widget
  • Facebook Like
  • Google Plus One

Jump to section

  • Article
    • Abstract
    • INTRODUCTION
    • MATERIALS AND METHODS
    • RESULTS
    • DISCUSSION
    • CONCLUSIONS
    • ACKNOWLEDGMENTS
    • Appendix
    • Footnotes
    • REFERENCES
  • Figures & Data
  • Info & Metrics
  • References
  • PDF

Related Articles

  • No related articles found.
  • Google Scholar

Cited By...

  • The kinetics of solid-state isotope-exchange reactions for clumped isotopes: A study of inorganic calcites and apatites from natural and experimental samples
  • Biological signatures in clumped isotopes of O2
  • Google Scholar

More in this TOC Section

  • Timing and Nd-Hf isotopic mapping of early Mesozoic granitoids in the Qinling Orogen, central China: Implication for architecture, nature and processes of the orogen
  • India in the Nuna to Gondwana supercontinent cycles: Clues from the north Indian and Marwar Blocks
  • Unravelling the P-T-t history of three high-grade metamorphic events in the Epupa Complex, NW Namibia: Implications for the Paleoproterozoic to Mesoproterozoic evolution of the Congo Craton
Show more Articles

Similar Articles

Keywords

  • CO2 hydration/dehydration
  • clumped and oxygen isotopes

Navigate

  • Current Issue
  • Archive

More Information

  • RSS

Other Services

  • About Us

© 2022 American Journal of Science

Powered by HighWire