(Table 1, pages 779) Alpha track determination of growth rates of manganese nodules, Pacific Ocean, supplement to: MacDougall, J Douglas (1979): The distribution of total alpha radioactivity in selected manganese nodules from the North Pacific: implications for growth processes. In: Bischoff, J.L., Piper, D.Z. (Eds.), Marine Geology and Oceanography of the Pacific Manganese Nodule Province, Marine Science. Plenum Publishing Corporation, New York, U.S.A., 775-790


Analyses of the total alpha radioactivity distribution in 31 North Pacific manganese nodules yield an average growth rate of 6.8 ( 2) mm /m.y. Samples from a single box core show almost identical total activity vs. depth profiles, regardless of nodule size or shape. A characteristic feature of many nodules examined is an apparent change (steepening) in slope of the alpha activity profile between depths of 0.5-1.5 mm. This feature may reflect a fundamental feature of nodule growth, possibly mobility of 230Th or its daughters in a regular way, interrupted growth, or nodule turnover. Near-surface decreases in total alpha activity probably result from 226Ra loss.

Alpha particle tracks are detected photographically in a cellulose nitrate detector. Growth rates are determined from the ratio 230Th/231Pa excess.

DOI https://doi.org/10.1594/PANGAEA.881562
Related Identifier https://doi.org/10.1007/978-1-4684-3518-4_25
Related Identifier https://doi.org/10.7289/V52Z13FT
Related Identifier https://doi.org/10.7289/V53X84KN
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.881562
Creator MacDougall, J Douglas
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1979
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 164 data points
Discipline Earth System Research
Spatial Coverage (-107.800W, -4.233S, 173.765E, 40.340N); Pacific Ocean; DOMES Site C, Pacific Ocean
Temporal Coverage Begin 1950-08-05T00:00:00Z
Temporal Coverage End 1976-08-27T00:00:00Z