MacDougall, J Douglas (1979): (Table 1, pages 779) Alpha track determination of growth rates of manganese nodules, Pacific Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.881562, Supplement to: MacDougall, JD (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, https://doi.org/10.1007/978-1-4684-3518-4_25
Always quote citation above when using data! You can download the citation in several formats below.
Published: 1979 (exact date unknown) • DOI registered: 2017-11-08
Abstract:
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.
Source:
Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT
Further details:
Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN
Project(s):
Coverage:
Median Latitude: 19.897853 * Median Longitude: -139.161059 * South-bound Latitude: -4.233034 * West-bound Longitude: 173.765000 * North-bound Latitude: 40.340000 * East-bound Longitude: -107.800000
Date/Time Start: 1950-08-05T00:00:00 * Date/Time End: 1976-08-27T00:00:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
DSV-53P-8 * Latitude: 14.970000 * Longitude: -125.000000 * Elevation: -5000.0 m * Location: Pacific Ocean * Method/Device: Box corer (BC)
DWBD1 * Latitude: 21.450000 * Longitude: -126.717000 * Date/Time: 1957-10-25T00:00:00 * Elevation: -4300.0 m * Location: Pacific Ocean * Campaign: DOWNWIND-B1 (DNWB0ABD) * Basis: Spencer F. Baird * Method/Device: Dredge (DRG)
EXPL60-4 (NEL-14) * Latitude: 14.466667 * Longitude: -107.800000 * Date/Time: 1960-02-20T00:00:00 * Elevation: -3678.0 m * Recovery: 0.64 m * Location: Pacific Ocean * Campaign: Seattle-Norfolk_1960 * Basis: Explorer * Method/Device: Core (CORE)
Comment:
Alpha particle tracks are detected photographically in a cellulose nitrate detector. Growth rates are determined from the ratio 230Th/231Pa excess.
From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | MacDougall, J Douglas | |||
| 2 | Latitude of event | Latitude | MacDougall, J Douglas | |||
| 3 | Longitude of event | Longitude | MacDougall, J Douglas | |||
| 4 | Elevation of event | Elevation | m | MacDougall, J Douglas | ||
| 5 | Method/Device of event | Method/Device | MacDougall, J Douglas | |||
| 6 | Identification | ID | MacDougall, J Douglas | |||
| 7 | Sample code/label | Sample label | MacDougall, J Douglas | |||
| 8 | DEPTH, sediment/rock | Depth sed | m | MacDougall, J Douglas | Geocode | |
| 9 | Growth rate | µ | mm/a | MacDougall, J Douglas | ||
| 10 | Growth rate, standard deviation | µ std dev | ± | MacDougall, J Douglas | ||
| 11 | Deposit type | Deposit type | MacDougall, J Douglas | |||
| 12 | Size | Size | mm | MacDougall, J Douglas |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
164 data points