Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.222..259v&link_type=abstract
Earth and Planetary Science Letters, Volume 222, Issue 1, p. 259-273.
Other
5
Hydrothermal Fluids, Hf Isotopes, Pb Isotopes, Ferromanganese Crusts, Galapagos Rise
Scientific paper
Secular variations in the Pb isotopic composition of a mixed hydrogenous-hydrothermal ferromanganese crust from the Bauer Basin in the eastern Equatorial Pacific provide clear evidence for changes in hydrothermal contributions during the past 7 Myr. The nearby Galapagos Rise spreading center provided a strong hydrothermal flux prior to 6.5 Ma. After 6.5 Ma, the Pb became stepwise more radiogenic and more similar to Equatorial Pacific seawater, reflecting the westward shift of spreading to the presently active East Pacific Rise (EPR). A second, previously unrecognized enhanced hydrothermal period occurred between 4.4 and 2.9 Ma, which reflects either off-axis hydrothermal activity in the Bauer Basin or a late-stage pulse of hydrothermal Pb from the then active, but waning Galapagos Rise spreading center.
Hafnium isotope time-series of the same mixed hydrogenous-hydrothermal crust show invariant values over the past 7 Myr. Hafnium isotope ratios, as well as Nd isotope ratios obtained for this crust, are identical to that of hydrogenous Equatorial Pacific deep water crusts and clearly indicate that hydrothermal Hf, similar to Nd, does not travel far from submarine vents. Therefore, we suggest that hydrothermal Hf fluxes do not contribute significantly to the global marine Hf budget.
Frank Martin
Günther Detlef
Halliday Alex N.
Hattendorf Bodo
Hein James R.
No associations
LandOfFree
Tracing the history of submarine hydrothermal inputs and the significance of hydrothermal hafnium for the seawater budget-a combined Pb-Hf-Nd isotope approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Tracing the history of submarine hydrothermal inputs and the significance of hydrothermal hafnium for the seawater budget-a combined Pb-Hf-Nd isotope approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tracing the history of submarine hydrothermal inputs and the significance of hydrothermal hafnium for the seawater budget-a combined Pb-Hf-Nd isotope approach will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1057642