Determining the Δ47 acid fractionation in dolomites

Sean T. Murray, Monica M. Arienzo, Peter K Swart

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

This paper reports the fractionation of Δ47 during the digestion of dolomite in phosphoric acid between 25°C and 90°C using five different samples, including three of Pliocene age from the Bahamas, one from the Jurassic in the Middle East, and one obtained from the National Institute of Standards (NIST 88b). The composition of the dolomites analyzed varied from Ca0.56Mg0.44CO3 to Ca0.50Mg0.50CO3. Fractionation values were also compared between the common acid bath and sealed vessel techniques at various temperatures. No statistically significant differences were observed either between these two methods or as a function of the dolomite's stoichiometry.These data produce a difference in fractionation of 0.153±0.011‰ for dolomite samples digested at 90°C compared to those reacted at 25°C, a value higher and statistically different to previously published values. Utilization of this value in a study of dolomites from a core drilled on the island of San Salvador in the Bahamas yielded temperatures and δ18Ofluid values which agree with previous interpretations on the formation of these dolomites. Application of this value to other published studies produces lower estimates of temperature and δ18Ofluid values for the dolomitization process that are more consistent with the geologic models suggested for these studies.

Original languageEnglish (US)
Pages (from-to)42-53
Number of pages12
JournalGeochimica et Cosmochimica Acta
Volume174
DOIs
StatePublished - Feb 1 2016

Fingerprint

Fractionation
dolomite
fractionation
Acids
acid
Geologic models
dolomitization
temperature
stoichiometry
Stoichiometry
Temperature
digestion
Pliocene
vessel
Jurassic
Chemical analysis

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Determining the Δ47 acid fractionation in dolomites. / Murray, Sean T.; Arienzo, Monica M.; Swart, Peter K.

In: Geochimica et Cosmochimica Acta, Vol. 174, 01.02.2016, p. 42-53.

Research output: Contribution to journalArticle

Murray, Sean T. ; Arienzo, Monica M. ; Swart, Peter K. / Determining the Δ47 acid fractionation in dolomites. In: Geochimica et Cosmochimica Acta. 2016 ; Vol. 174. pp. 42-53.
@article{cfd4e5979cf74edabc665d595ccd5103,
title = "Determining the Δ47 acid fractionation in dolomites",
abstract = "This paper reports the fractionation of Δ47 during the digestion of dolomite in phosphoric acid between 25°C and 90°C using five different samples, including three of Pliocene age from the Bahamas, one from the Jurassic in the Middle East, and one obtained from the National Institute of Standards (NIST 88b). The composition of the dolomites analyzed varied from Ca0.56Mg0.44CO3 to Ca0.50Mg0.50CO3. Fractionation values were also compared between the common acid bath and sealed vessel techniques at various temperatures. No statistically significant differences were observed either between these two methods or as a function of the dolomite's stoichiometry.These data produce a difference in fractionation of 0.153±0.011‰ for dolomite samples digested at 90°C compared to those reacted at 25°C, a value higher and statistically different to previously published values. Utilization of this value in a study of dolomites from a core drilled on the island of San Salvador in the Bahamas yielded temperatures and δ18Ofluid values which agree with previous interpretations on the formation of these dolomites. Application of this value to other published studies produces lower estimates of temperature and δ18Ofluid values for the dolomitization process that are more consistent with the geologic models suggested for these studies.",
author = "Murray, {Sean T.} and Arienzo, {Monica M.} and Swart, {Peter K}",
year = "2016",
month = "2",
day = "1",
doi = "10.1016/j.gca.2015.10.029",
language = "English (US)",
volume = "174",
pages = "42--53",
journal = "Geochmica et Cosmochimica Acta",
issn = "0016-7037",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Determining the Δ47 acid fractionation in dolomites

AU - Murray, Sean T.

AU - Arienzo, Monica M.

AU - Swart, Peter K

PY - 2016/2/1

Y1 - 2016/2/1

N2 - This paper reports the fractionation of Δ47 during the digestion of dolomite in phosphoric acid between 25°C and 90°C using five different samples, including three of Pliocene age from the Bahamas, one from the Jurassic in the Middle East, and one obtained from the National Institute of Standards (NIST 88b). The composition of the dolomites analyzed varied from Ca0.56Mg0.44CO3 to Ca0.50Mg0.50CO3. Fractionation values were also compared between the common acid bath and sealed vessel techniques at various temperatures. No statistically significant differences were observed either between these two methods or as a function of the dolomite's stoichiometry.These data produce a difference in fractionation of 0.153±0.011‰ for dolomite samples digested at 90°C compared to those reacted at 25°C, a value higher and statistically different to previously published values. Utilization of this value in a study of dolomites from a core drilled on the island of San Salvador in the Bahamas yielded temperatures and δ18Ofluid values which agree with previous interpretations on the formation of these dolomites. Application of this value to other published studies produces lower estimates of temperature and δ18Ofluid values for the dolomitization process that are more consistent with the geologic models suggested for these studies.

AB - This paper reports the fractionation of Δ47 during the digestion of dolomite in phosphoric acid between 25°C and 90°C using five different samples, including three of Pliocene age from the Bahamas, one from the Jurassic in the Middle East, and one obtained from the National Institute of Standards (NIST 88b). The composition of the dolomites analyzed varied from Ca0.56Mg0.44CO3 to Ca0.50Mg0.50CO3. Fractionation values were also compared between the common acid bath and sealed vessel techniques at various temperatures. No statistically significant differences were observed either between these two methods or as a function of the dolomite's stoichiometry.These data produce a difference in fractionation of 0.153±0.011‰ for dolomite samples digested at 90°C compared to those reacted at 25°C, a value higher and statistically different to previously published values. Utilization of this value in a study of dolomites from a core drilled on the island of San Salvador in the Bahamas yielded temperatures and δ18Ofluid values which agree with previous interpretations on the formation of these dolomites. Application of this value to other published studies produces lower estimates of temperature and δ18Ofluid values for the dolomitization process that are more consistent with the geologic models suggested for these studies.

UR - http://www.scopus.com/inward/record.url?scp=84948784072&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84948784072&partnerID=8YFLogxK

U2 - 10.1016/j.gca.2015.10.029

DO - 10.1016/j.gca.2015.10.029

M3 - Article

AN - SCOPUS:84948784072

VL - 174

SP - 42

EP - 53

JO - Geochmica et Cosmochimica Acta

JF - Geochmica et Cosmochimica Acta

SN - 0016-7037

ER -