Computer Science
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1765n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 8, pp.1765-1774
Computer Science
Scientific paper
A deep-sea Mn nodule handpicked from top of a 20 cm diameter North Pacific tripod core was directly counted by an -spectrometer with a silicon surface barrier detector. A distinct 210 Po peak was recorded for the nodule upper side in contact with bottom seawater. Based on the spectrum, the 210 Po (supported by 210 Pb with 22 year half life) is thought to be confined in the top few microns of the nodule. Since the 210 Po peak diminishes considerably for the bottom side resting on sediment, nondestructive -spectrometry is useful for determining the sea floor orientation of nodules. This method was tested for a western North Pacific dredged Mn nodule, and was successful in identifying the orientation (and also surface loss of the nodule by dredging). Radiochemical analysis was also carried out for carefully scraped samples from the top and bottom of the two nodules. The growth rates of the hand-picked nodule based on excess 230 Th and 231 Pa profiles were 1 to 4 mm/10 6 y and apparently varied with time. The dredged sample has grown at 2 to 6 mm/ 10 6 y and the growth has likely been episodic. The radionuclide composition was significantly different between the top and bottom. Evidence was found that the radionuclide fluxes of 230 Th and 231 Pa into the nodules considerably changed during the growing histories. The 230 Th/ 232 Th activity ratios in the nodule tops are comparable with those in bottom seawater suggesting that the top is growing with metals of seawater origin. However it remains unresolved whether the nodule bottoms are growing by utilizing metals in the sediment pore water.
Nozaki Yoshiyuki
Yang Han-Soeb
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