Unknown
PANGAEA
In:
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, https://doi.org/10.1007/978-1-4684-3518-4_25
Publication Date:
2024-07-01
Description:
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.
Keywords:
Agassiz; Argo; BC; Box corer; Core; CORE; Deposit type; DEPTH, sediment/rock; DNWB0ABD; DOMES Site C, Pacific Ocean; DOWNWIND-B1; Dredge; Dredge, bucket; DRG; DRG_BU; DSV-53P-8; DWBD1; Elevation of event; Event label; EXPL60-14D; EXPL60-4; Explorer; FFGR; Free-fall grab; GC; Grab; GRAB; Gravity corer; Growth rate; Growth rate, standard deviation; Horizon; Identification; Latitude of event; Longitude of event; MDPC01HO-005-02; MDPC01HO-016-01; Melville; Method/Device of event; MIDPAC; Mn-74-02-13B-D-001; Mn-74-02-13B-FFG-008; Mn-74-02-16-FFG-037; Mn-74-02 IDOE DOMES; MN76-01, Pleiades; Moana Wave; MONS01AR-MONS08AR; MONS08AR-150G; MONSOON; MPC-16-1; MPC-5-2; MSN-150G; MW7402; MW7402-13D01; MW7402-13G08; MW7402-16G37; NEL-14; NEL-4; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Oceanographer; Pacific Ocean; Photo/Video; PLDS04MV-109BX; PLDS-4; PV; RISEPAC; RISP-4PG; RP6OC75; RP6OC75-25-51; Sample code/label; SCR-MN-61; SCR-MN-68; SCR-MN-70; SCR-MR-55; SCR-MR-A17875; Seascope Expedition; Seattle-Norfolk_1960; Size; Spencer F. Baird; SS72/5; SS72-111DB; STYX_II; STYX02AZ; STYXII-48FF; TC; TRAWL; Trawl net; Trigger corer; Vityaz (ex-Mars); Vityaz-29; VITYAZ4221-TR
Type:
Dataset
Format:
text/tab-separated-values, 164 data points
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