The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: implications for seawater chemistry?

Details The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: implications for seawater chemistry? The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: implications for seawater chemistry?

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.224...91l&link_type=abstract

Earth and Planetary Science Letters, Volume 224, Issue 1-2, p. 91-105.

Other

17

Iron Isotopes, Manganese Crusts, Atmospheric Input, Hydrothermal Input, Intraoceanic Processes

Scientific paper

The iron (Fe) isotope compositions of 37 hydrogenetic ferromanganese deposits from various oceans have been analysed by MC-ICPMS; they permit the construction of a global map of Fe isotopic values. The isotopic compositions range between -1.2 and -0.1‰ in δ57FeIRMM14. Averages for the Atlantic and the Pacific are -0.41 and -0.88‰, but their standard deviations are identical (0.27, 1σ) and the data very largely overlap. No correlation is found with Pb or Nd isotope compositions and there is no evidence that the observed oceanic Fe isotopic heterogeneity is directly controlled by variations in continental sources. The small quantities of Fe that can be introduced from hydrothermal sources render as unlikely the possibility that the isotopic variations reflect variable proportions of continental and hydrothermal Fe, as recently proposed. The more likely explanation is that the variations are induced locally within the ocean. The exact sources of fractionation remain unclear. Likely possibilities are the dissolution and reprecipitation processes that liberate Fe from sediments during anoxic events, dissolution in surface waters or processes occurring during growth of the crusts.

Affiliated with

Also associated with

No associations

Rating

The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: implications for seawater chemistry? 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 The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: implications for seawater chemistry?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: implications for seawater chemistry? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1009281