Other
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.261..296n&link_type=abstract
Earth and Planetary Science Letters, Volume 261, Issue 1-2, p. 296-302.
Other
1
Scientific paper
This paper presents a new approach for determining the paleo-redox conditions of the Early Archean deep-sea using U Th systematics of seafloor hydrothermally altered basalts. In the modern ocean system, fresh unaltered basaltic glasses from the seafloor exhibit a tight U Th correlation, which reflects magmatic processes. However, basalts that have been hydrothermally altered are noticeably enriched in U due to adsorption and precipitation of dissolved U from oxygenated deep-sea water onto the altered rocks. Irrespective of alteration temperature they exhibit much higher U/Th (up to 34) than the primary igneous ratio of ˜0.35. In marked contrast, hydrothermally altered basalts from the Early Archean (3.46 Ga) seafloor have maintained igneous U/Th (˜0.25) perfectly, in spite of having been subjected to intense alteration. This can be explained by a lack of dissolved U in Early Archean deep-sea water due to the prevalence of anoxic deep-sea conditions.
Kato Yasuhiro
Nakamura Kentaro
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