Sediment in the black smoker area of the East Pacific Rise (18.5°S)

Details Sediment in the black smoker area of the East Pacific Rise (18.5°S) Sediment in the black smoker area of the East Pacific Rise (18.5°S)

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..79...93m&link_type=abstract

Earth and Planetary Science Letters, Volume 79, Issue 1-2, p. 93-106.

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15

Scientific paper

A sediment profile perpendicular to the East Pacific Rise (EPR) was investigated in an area in which massive sulfides have been observed along the axis of the EPR. A Holocene to Late Pleistocene age is concluded for all of the up-to-3-m-long cores leading to sedimentation rates of 0.3-2.6 cm/1000 a. The sediments are composed of hydrothermal precipitate, calcareous tests and, in traces, hyaloclastic material. The proportion of carbonate increases with increasing distance from the spreading center. The hyaloclastic material is more or less weathered and is concentrated near the spreading center. The hydrothermal component is composed mainly of iron and manganese hydroxides. The proportion of hydrothermal matter in the sediment is higher near the axis of the EPR. Also near the axis, the elements B, P, Cr, and V are enriched in the hydrothermal component whereas Mn, Zn, Cu, Fe, and As are depleted. The core profiles show a fluctuation in the proportion of hydrothermal material. Periods of higher hydrothermal input correlate with periods of the best calcite preservation. Diagenetic alteration of the sediment increases with increasing distance from the spreading center, i.e. with decreasing sedimentation rate. Mo, Zr, Co, Ni, Rb, Th, Y, Ba, La, and REE are enriched in the sediment by diagenetic processes.

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