Boron and boron isotopes in pore waters from ODP Leg 127, Sea of Japan

Details Boron and boron isotopes in pore waters from ODP Leg 127, Sea of Japan Boron and boron isotopes in pore waters from ODP Leg 127, Sea of Japan

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.113..427b&link_type=abstract

Earth and Planetary Science Letters, Volume 113, Issue 3, p. 427-433.

Computer Science

8

Scientific paper

Interstitial waters that have been recovered from the Sea of Japan down to a depth of 662 m below seafloor were analysed for B and δ11B. B concentrations cover the range 0.12-3.37 mM (0.3-8 × seawater) and vary isotopically from +11.5 to +51.3‰ (relative to SRM 951 boric acid). Consistent concentration depth profiles demonstrate that the behaviour of this element is non-conservative and much more complicated during early diagenesis than previously thought. Small departures from seawater B concentration and isotopic composition in the core tops from sites in the Yamato Basin result from the desorption of an isotopically light B fraction. In the Japan Basin a large positive δ11B anomaly seems to be related to the preferential adsorption of 10B in the depth range of more frequent ash layers. A large negative B anomaly seems to result from the alteration of volcaniclastic sands in a recently uplifted area. It seems that the thermal regime, in particular high heat flow, leads to B and Li maxima, δ11B values lighter than seawater, and rather low Sr87/Sr86 ratios. B seems to be removed from pore waters at greater depth. It is finally incorporated into the sediment itself or altered basement rocks.
Adsorption/desorption processes and alteration reactions within the sedimentary column and in the basement rocks govern the distribution of B in the pore fluids and should also influence the B content and isotopic composition of the alteration products, mainly clay minerals.

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