High-temperature seafloor hydrothermal circulation over geologic time and archean banded iron formations

TitleHigh-temperature seafloor hydrothermal circulation over geologic time and archean banded iron formations
Publication TypeJournal Article
Year of Publication2003
AuthorsLowell, RP, Keller, SM
JournalGeophysical Research Letters
Volume30
Issue7
Pagination1-44
Date PublishedApr 9
ISSN0094-8276
Accession NumberWOS:000182348000002
Abstract

Under the assumption of simple plate tectonics with a range of continental growth scenarios, we construct models of global lithospheric heat loss, hydrothermal heat loss and hydrothermal iron flux to the ocean as functions of geologic time from 4.0 Ga to present. The models show that lithospheric heat loss scales with the square root of the plate creation rate, whereas hydrothermal heat loss scales linearly with that rate. Thus during the Archean lithospheric and hydrothermal heat losses were approximate to3 and approximate to10 times greater than present, respectively. Straightforward extrapolation of hydrothermal Fe flux from the present to the Archean using these models indicates that hydrothermal Fe may not have been sufficient to supply the large Superior-type Banded Iron Formations deposited between 2.7 and 1.8 Ga.

DOI10.1029/2002GL016536