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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1979
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| Online Access: | https://doi.org/10.1594/PANGAEA.881562 |
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| _version_ | 1867171851373903872 |
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| author | MacDougall, J Douglas |
| author_facet | MacDougall, J Douglas |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_881562 |
| institution | PANGAEA |
| language | en |
| publishDate | 1979 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1, pages 779) Alpha track determination of growth rates of manganese nodules, Pacific Ocean MacDougall, J Douglas 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 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. |
| title | (Table 1, pages 779) Alpha track determination of growth rates of manganese nodules, Pacific Ocean |
| topic | 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 |
| url | https://doi.org/10.1594/PANGAEA.881562 |