Hf isotope ratios of marine sediments and Mn nodules: evidence for a mantle source of Hf in seawater

Details Hf isotope ratios of marine sediments and Mn nodules: evidence for a mantle source of Hf in seawater Hf isotope ratios of marine sediments and Mn nodules: evidence for a mantle source of Hf in seawater

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..79...46w&link_type=abstract

Earth and Planetary Science Letters, Volume 79, Issue 1-2, p. 46-54.

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Hf isotope ratios are reported for 6 Mn nodules and 15 other sediments, including siliceous oozes, red clays and terrigenous sediments. Overall, ɛHf ranges from -19.8 to +3.5, but only from +0.4 to +3.5 in the Mn nodules. The Indian and Atlantic nodules have ɛHf values (+0.4 and +0.9) which are only slightly lower than values from Pacific nodules (+1.9 to +3.5). The positive ɛHf values of the Mn nodules indicate much, and perhaps most, of the Hf in seawater is derived from some ``mantle'' source such as ocean ridge hydrothermal activity, low-temperature alteration of the oceanic crust, or weathering of the young volcanic terranes of the circum-Pacific region. The dominance of ``mantle'' sources of Hf may result from a very low flux of Hf from the continents rather than a particularly high volcanic one. A low continental flux may result from retention of Hf in zircon, a mineral which is very resistant to weathering. The near uniformity of Hf in nodules from various oceans suggests a longer seawater residence time for Hf than for Nd, probably because Hf is not readily scavanged by particulate matter.
Laboratoire de Géochemie, I.P.G., Université de Paris VI et VII, 4 Place Jussieu, 75230 Paris, France.

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