Abstract
We present Fe isotope data for high temperature hydrothermal fluids, sulfides, and basalts from the Juan de Fuca Ridge. USGS basalt standard BCR-2 and the Canyon Diablo iron meteorite. The Fe isotopic compositions of all samples fall within a range of ∼1%. However, there is a small but statistically significant isotopic variation between Fe dissolved in hydrothermal fluids and Fe in Canyon Diablo. Specifically, the hydrothermal fluids are lighter compared to Canyon Diablo, yielding δ56Fe (= BCR-2 basalt and Canyon Diablo are isotopically indistinguishable. Measurements of δ56Fe in Juan de Fuca Ridge basalts and sulfides suggest that Fe isotopes are fractionated in hydrothermal systems. However, the data do not exclude the possibility of small δ56Fe differences between the rocks from which fluid Fe is derived and other igneous Fe, in which case fractionation in igneous systems is indicated. Regardless, these results are evidence of non-biological mass fractionation of Fe isotopes in nature. Further, venting of hydrothermal fluids into the overlying water column could provide a source of isotopically light Fe to the deep oceans, contributing to Fe isotopic variations observed in deep-sea sediments.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 39-51 |
| Number of pages | 13 |
| Journal | Earth and Planetary Science Letters |
| Volume | 194 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - 2001 |
| Externally published | Yes |
Fingerprint
Keywords
- Canyon Diablo
- Fluid phase
- Hydrothermal vents
- Inductively coupled plasma methods
- Iron
- Isotope fractionation
- Juan de Fuca Ridge
- Mass spectroscopy
- Meteorite
- Stable isotopes
- Sulfides
ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics
Cite this
Iron isotopes in hot springs along the Juan de Fuca Ridge. / Sharma, M.; Polizzotto, M.; Anbar, Ariel.
In: Earth and Planetary Science Letters, Vol. 194, No. 1-2, 2001, p. 39-51.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Iron isotopes in hot springs along the Juan de Fuca Ridge
AU - Sharma, M.
AU - Polizzotto, M.
AU - Anbar, Ariel
PY - 2001
Y1 - 2001
N2 - We present Fe isotope data for high temperature hydrothermal fluids, sulfides, and basalts from the Juan de Fuca Ridge. USGS basalt standard BCR-2 and the Canyon Diablo iron meteorite. The Fe isotopic compositions of all samples fall within a range of ∼1%. However, there is a small but statistically significant isotopic variation between Fe dissolved in hydrothermal fluids and Fe in Canyon Diablo. Specifically, the hydrothermal fluids are lighter compared to Canyon Diablo, yielding δ56Fe (= BCR-2 basalt and Canyon Diablo are isotopically indistinguishable. Measurements of δ56Fe in Juan de Fuca Ridge basalts and sulfides suggest that Fe isotopes are fractionated in hydrothermal systems. However, the data do not exclude the possibility of small δ56Fe differences between the rocks from which fluid Fe is derived and other igneous Fe, in which case fractionation in igneous systems is indicated. Regardless, these results are evidence of non-biological mass fractionation of Fe isotopes in nature. Further, venting of hydrothermal fluids into the overlying water column could provide a source of isotopically light Fe to the deep oceans, contributing to Fe isotopic variations observed in deep-sea sediments.
AB - We present Fe isotope data for high temperature hydrothermal fluids, sulfides, and basalts from the Juan de Fuca Ridge. USGS basalt standard BCR-2 and the Canyon Diablo iron meteorite. The Fe isotopic compositions of all samples fall within a range of ∼1%. However, there is a small but statistically significant isotopic variation between Fe dissolved in hydrothermal fluids and Fe in Canyon Diablo. Specifically, the hydrothermal fluids are lighter compared to Canyon Diablo, yielding δ56Fe (= BCR-2 basalt and Canyon Diablo are isotopically indistinguishable. Measurements of δ56Fe in Juan de Fuca Ridge basalts and sulfides suggest that Fe isotopes are fractionated in hydrothermal systems. However, the data do not exclude the possibility of small δ56Fe differences between the rocks from which fluid Fe is derived and other igneous Fe, in which case fractionation in igneous systems is indicated. Regardless, these results are evidence of non-biological mass fractionation of Fe isotopes in nature. Further, venting of hydrothermal fluids into the overlying water column could provide a source of isotopically light Fe to the deep oceans, contributing to Fe isotopic variations observed in deep-sea sediments.
KW - Canyon Diablo
KW - Fluid phase
KW - Hydrothermal vents
KW - Inductively coupled plasma methods
KW - Iron
KW - Isotope fractionation
KW - Juan de Fuca Ridge
KW - Mass spectroscopy
KW - Meteorite
KW - Stable isotopes
KW - Sulfides
UR - http://www.scopus.com/inward/record.url?scp=0035705227&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035705227&partnerID=8YFLogxK
U2 - 10.1016/S0012-821X(01)00538-6
DO - 10.1016/S0012-821X(01)00538-6
M3 - Article
AN - SCOPUS:0035705227
VL - 194
SP - 39
EP - 51
JO - Earth and Planetary Sciences Letters
JF - Earth and Planetary Sciences Letters
SN - 0012-821X
IS - 1-2
ER -