Magnetic charachterization of surface sediments in the South Atlantic
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PANGAEA
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1999
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| _version_ | 1867168583407108096 |
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| author | Schmidt, Andrea |
| author_facet | Schmidt, Andrea |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Surface sediment samples representative for the tropical and subtropical South Atlantic (15°N to 40°S) were investigated by isothermal magnetic methods to delineate magnetic mineral distribution patterns and to identify their predominant Holocene climatic and oceanographic controls. Individual parameters reveal distinct, yet frequently overlapping, regional sedimentation characteristics. A probabilistic ('fuzzy c-means') cluster analysis was applied to five concentration independent magnetic properties assessing magnetite to hematite ratios and diagnostic of bulk and fine-particle magnetite grain size and coercivity spectra. The resultant 10 cluster structures establish an oceanwide magnetic sediment classification scheme tracing the major terrigenous eolian and fluvial fluxes, authigenic biogenic magnetite accumulation in high-productivity areas, transport by ocean current systems, and effects of bottom water velocity on depositional regimes. Distinct dissimilarities in magnetic mineral inventories between the eastern and western basins of the South Atlantic reflect prominent contrasts of both oceanic and continental influences. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_55291 |
| institution | PANGAEA |
| language | en |
| publishDate | 1999 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Magnetic charachterization of surface sediments in the South Atlantic Schmidt, Andrea 06MT15_2; Amazon Fan; Amazon Shelf/Fan; Angola Basin; Angola Benguela Front; Angola Diapir Field; Argentine Basin; ARM, 100 mT AF, 0.04 mT DF; ARM, Intensity, per unit volume; ARM, median destructive field of anhysteretic remanent magnetization; ARM/IRM; Atlantic Caribbean Margin; Brazil Basin; Cape Basin; Congo Fan; Continental slope off Brazil; East Brazil Basin; Eastern Rio Grande Rise; Elevation of event; Equatorial Atlantic; Event label; GeoB; GeoB1005-2; GeoB1009-3; GeoB1010-3; GeoB1016-2; GeoB1017-3; GeoB1025-2; GeoB1026-3; GeoB1028-4; GeoB1029-1; GeoB1031-1; GeoB1032-2; GeoB1033-3; GeoB1035-3; GeoB1036-3; GeoB1037-1; GeoB1039-1; GeoB1040-3; GeoB1041-1; GeoB1043-2; GeoB1044-3; GeoB1046-2; GeoB1047-3; GeoB1101-4; GeoB1102-3; GeoB1104-5; GeoB1106-5; GeoB1109-4; GeoB1111-5; GeoB1113-7; GeoB1114-3; GeoB1115-4; GeoB1116-1; GeoB1117-3; GeoB1118-2; GeoB1119-2; GeoB1203-2; GeoB1212-2; GeoB1214-2; GeoB1216-2; GeoB1218-1; GeoB1220-2; GeoB1310-1; GeoB1311-2; GeoB1312-3; GeoB1313-1; GeoB1314-2; GeoB1315-2; GeoB1402-7; GeoB1403-1; GeoB1404-8; GeoB1405-8; GeoB1406-1; GeoB1413-1; GeoB1414-2; GeoB1415-1; GeoB1417-2; GeoB1418-1; GeoB1419-1; GeoB1420-1; GeoB1421-1; GeoB1501-2; GeoB1503-2; GeoB1504-1; GeoB1505-4; GeoB1506-1; GeoB1508-2; GeoB1509-2; GeoB1510-1; GeoB1511-6; GeoB1512-1; GeoB1513-2; GeoB1514-5; GeoB1515-2; GeoB1519-2; GeoB1523-2; GeoB1606-7; GeoB1701-1; GeoB1702-7; GeoB1703-3; GeoB1704-2; GeoB1707-2; GeoB1710-2; GeoB1712-1; GeoB1713-6; GeoB1715-1; GeoB1716-1; GeoB1720-3; GeoB1721-5; GeoB1722-2; GeoB1724-4; GeoB1726-2; GeoB1728-2; GeoB1729-1; GeoB2001-1; GeoB2003-1; GeoB2004-1; GeoB2016-3; GeoB2018-1; GeoB2019-2; GeoB2021-4; GeoB2022-3; GeoB2102-1; GeoB2104-1; GeoB2106-1; GeoB2107-5; GeoB2108-1; GeoB2109-1; GeoB2110-1; GeoB2112-1; GeoB2113-1; GeoB2116-2; GeoB2117-4; GeoB2118-1; GeoB2119-2; GeoB2122-1; GeoB2123-1; GeoB2124-1; GeoB2126-1; GeoB2127-1; GeoB2129-1; GeoB2130-1; GeoB2301-1; GeoB2303-1; GeoB2304-1; GeoB2305-1; GeoB2306-1; GeoB2307-1; GeoB2308-1; GeoB2309-1; GeoB2310-1; GeoB2704-1; GeoB2705-7; GeoB2734-2; GeoB2801-1; GeoB2803-1; GeoB2804-2; GeoB2805-1; GeoB2806-6; GeoB2807-1; GeoB2808-3; GeoB2810-2; GeoB2811-1; GeoB2812-3; GeoB2813-1; GeoB2814-3; GeoB2817-3; GeoB2818-1; GeoB2819-2; GeoB2820-1; GeoB2821-2; GeoB2824-1; GeoB2825-3; GeoB2826-1; GeoB2827-2; GeoB2828-1; GeoB2829-3; GeoB2830-1; GeoB2905-1; GeoB2908-8; GeoB2909-1; GeoB2911-2; GeoB3601-1; GeoB3602-2; GeoB3603-1; GeoB3604-4; GeoB3605-1; GeoB3608-1; GeoB3801-5; GeoB3802-2; GeoB3803-1; GeoB3804-2; GeoB3805-1; GeoB3806-2; GeoB3807-1; GeoB3808-7; GeoB3809-1; GeoB3810-2; GeoB3812-2; GeoB3822-1; GeoB3825-1; GeoB3826-2; GeoB3827-1; GeoB3906-9; GeoB3908-11; GeoB3909-1; GeoB3910-3; GeoB3911-1; GeoB3912-2; GeoB3915-1; GeoB3925-2; GeoB3935-1; GeoB3936-2; GeoB3938-2; GeoB3939-1; Geosciences, University of Bremen; Giant box corer; GKG; Gravity corer (Kiel type); Guinea Basin; Hysteresis, Bcr/Bc; Hysteresis, coercive field; Hysteresis, remanent coercive field; Hysteresis, saturation magnetization; Hysteresis, saturation magnetization/ saturation remanence; Hysteresis, saturation remanence; Hysteresis, susceptibility, specific, ferromagnetic; Hysteresis, susceptibility, specific, non-ferromagnetic; Hysteresis, susceptibility, total specific; Hysteresis 0.3 T; Hysteresis 1.4 T; IRM, 800 mT DF; IRM, Intensity, per unit volume; Kappabridge; Kongo sediment fan; Latitude of event; Longitude of event; M12/1; M15/2; M16/1; M16/2; M20/1; M20/2; M23/1; M23/2; M29/1; M29/2; M29/3; M34/1; M34/3; M34/4; M6/6; M9/4; Magnetic susceptibility, volume; Magnetic susceptibility meter, Bartington MS2B bulk sensor; Magnetic susceptibility meter, Bartington MS2C coil sensor; Meteor (1986); Mid Atlantic Ridge; MUC; MultiCorer; Namibia Continental Margin; Namibia continental slope; Northeast Brasilian Margin; Northern Cape Basin; Northern Guinea Basin; Northern Rio Grande Rise; off Kunene; PROBOSWA; Rio Grande Rise; Santos Plateau; SFB261; SIRM 800 mT, Back field 300 mT; SL; Slope off Argentina; SO86; Sonne; South African margin; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Southern Cape Basin; South of Cape Verde Islands; S-ratio (hematite/magnetite); Susceptibility, frequency dependence; Susceptibility, specific; Uruguay continental margin; Vema Channel; Walvis Ridge; West Angola Basin; Western Equatorial Atlantic Surface sediment samples representative for the tropical and subtropical South Atlantic (15°N to 40°S) were investigated by isothermal magnetic methods to delineate magnetic mineral distribution patterns and to identify their predominant Holocene climatic and oceanographic controls. Individual parameters reveal distinct, yet frequently overlapping, regional sedimentation characteristics. A probabilistic ('fuzzy c-means') cluster analysis was applied to five concentration independent magnetic properties assessing magnetite to hematite ratios and diagnostic of bulk and fine-particle magnetite grain size and coercivity spectra. The resultant 10 cluster structures establish an oceanwide magnetic sediment classification scheme tracing the major terrigenous eolian and fluvial fluxes, authigenic biogenic magnetite accumulation in high-productivity areas, transport by ocean current systems, and effects of bottom water velocity on depositional regimes. Distinct dissimilarities in magnetic mineral inventories between the eastern and western basins of the South Atlantic reflect prominent contrasts of both oceanic and continental influences. |
| title | Magnetic charachterization of surface sediments in the South Atlantic |
| topic | 06MT15_2; Amazon Fan; Amazon Shelf/Fan; Angola Basin; Angola Benguela Front; Angola Diapir Field; Argentine Basin; ARM, 100 mT AF, 0.04 mT DF; ARM, Intensity, per unit volume; ARM, median destructive field of anhysteretic remanent magnetization; ARM/IRM; Atlantic Caribbean Margin; Brazil Basin; Cape Basin; Congo Fan; Continental slope off Brazil; East Brazil Basin; Eastern Rio Grande Rise; Elevation of event; Equatorial Atlantic; Event label; GeoB; GeoB1005-2; GeoB1009-3; GeoB1010-3; GeoB1016-2; GeoB1017-3; GeoB1025-2; GeoB1026-3; GeoB1028-4; GeoB1029-1; GeoB1031-1; GeoB1032-2; GeoB1033-3; GeoB1035-3; GeoB1036-3; GeoB1037-1; GeoB1039-1; GeoB1040-3; GeoB1041-1; GeoB1043-2; GeoB1044-3; GeoB1046-2; GeoB1047-3; GeoB1101-4; GeoB1102-3; GeoB1104-5; GeoB1106-5; GeoB1109-4; GeoB1111-5; GeoB1113-7; GeoB1114-3; GeoB1115-4; GeoB1116-1; GeoB1117-3; GeoB1118-2; GeoB1119-2; GeoB1203-2; GeoB1212-2; GeoB1214-2; GeoB1216-2; GeoB1218-1; GeoB1220-2; GeoB1310-1; GeoB1311-2; GeoB1312-3; GeoB1313-1; GeoB1314-2; GeoB1315-2; GeoB1402-7; GeoB1403-1; GeoB1404-8; GeoB1405-8; GeoB1406-1; GeoB1413-1; GeoB1414-2; GeoB1415-1; GeoB1417-2; GeoB1418-1; GeoB1419-1; GeoB1420-1; GeoB1421-1; GeoB1501-2; GeoB1503-2; GeoB1504-1; GeoB1505-4; GeoB1506-1; GeoB1508-2; GeoB1509-2; GeoB1510-1; GeoB1511-6; GeoB1512-1; GeoB1513-2; GeoB1514-5; GeoB1515-2; GeoB1519-2; GeoB1523-2; GeoB1606-7; GeoB1701-1; GeoB1702-7; GeoB1703-3; GeoB1704-2; GeoB1707-2; GeoB1710-2; GeoB1712-1; GeoB1713-6; GeoB1715-1; GeoB1716-1; GeoB1720-3; GeoB1721-5; GeoB1722-2; GeoB1724-4; GeoB1726-2; GeoB1728-2; GeoB1729-1; GeoB2001-1; GeoB2003-1; GeoB2004-1; GeoB2016-3; GeoB2018-1; GeoB2019-2; GeoB2021-4; GeoB2022-3; GeoB2102-1; GeoB2104-1; GeoB2106-1; GeoB2107-5; GeoB2108-1; GeoB2109-1; GeoB2110-1; GeoB2112-1; GeoB2113-1; GeoB2116-2; GeoB2117-4; GeoB2118-1; GeoB2119-2; GeoB2122-1; GeoB2123-1; GeoB2124-1; GeoB2126-1; GeoB2127-1; GeoB2129-1; GeoB2130-1; GeoB2301-1; GeoB2303-1; GeoB2304-1; GeoB2305-1; GeoB2306-1; GeoB2307-1; GeoB2308-1; GeoB2309-1; GeoB2310-1; GeoB2704-1; GeoB2705-7; GeoB2734-2; GeoB2801-1; GeoB2803-1; GeoB2804-2; GeoB2805-1; GeoB2806-6; GeoB2807-1; GeoB2808-3; GeoB2810-2; GeoB2811-1; GeoB2812-3; GeoB2813-1; GeoB2814-3; GeoB2817-3; GeoB2818-1; GeoB2819-2; GeoB2820-1; GeoB2821-2; GeoB2824-1; GeoB2825-3; GeoB2826-1; GeoB2827-2; GeoB2828-1; GeoB2829-3; GeoB2830-1; GeoB2905-1; GeoB2908-8; GeoB2909-1; GeoB2911-2; GeoB3601-1; GeoB3602-2; GeoB3603-1; GeoB3604-4; GeoB3605-1; GeoB3608-1; GeoB3801-5; GeoB3802-2; GeoB3803-1; GeoB3804-2; GeoB3805-1; GeoB3806-2; GeoB3807-1; GeoB3808-7; GeoB3809-1; GeoB3810-2; GeoB3812-2; GeoB3822-1; GeoB3825-1; GeoB3826-2; GeoB3827-1; GeoB3906-9; GeoB3908-11; GeoB3909-1; GeoB3910-3; GeoB3911-1; GeoB3912-2; GeoB3915-1; GeoB3925-2; GeoB3935-1; GeoB3936-2; GeoB3938-2; GeoB3939-1; Geosciences, University of Bremen; Giant box corer; GKG; Gravity corer (Kiel type); Guinea Basin; Hysteresis, Bcr/Bc; Hysteresis, coercive field; Hysteresis, remanent coercive field; Hysteresis, saturation magnetization; Hysteresis, saturation magnetization/ saturation remanence; Hysteresis, saturation remanence; Hysteresis, susceptibility, specific, ferromagnetic; Hysteresis, susceptibility, specific, non-ferromagnetic; Hysteresis, susceptibility, total specific; Hysteresis 0.3 T; Hysteresis 1.4 T; IRM, 800 mT DF; IRM, Intensity, per unit volume; Kappabridge; Kongo sediment fan; Latitude of event; Longitude of event; M12/1; M15/2; M16/1; M16/2; M20/1; M20/2; M23/1; M23/2; M29/1; M29/2; M29/3; M34/1; M34/3; M34/4; M6/6; M9/4; Magnetic susceptibility, volume; Magnetic susceptibility meter, Bartington MS2B bulk sensor; Magnetic susceptibility meter, Bartington MS2C coil sensor; Meteor (1986); Mid Atlantic Ridge; MUC; MultiCorer; Namibia Continental Margin; Namibia continental slope; Northeast Brasilian Margin; Northern Cape Basin; Northern Guinea Basin; Northern Rio Grande Rise; off Kunene; PROBOSWA; Rio Grande Rise; Santos Plateau; SFB261; SIRM 800 mT, Back field 300 mT; SL; Slope off Argentina; SO86; Sonne; South African margin; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Southern Cape Basin; South of Cape Verde Islands; S-ratio (hematite/magnetite); Susceptibility, frequency dependence; Susceptibility, specific; Uruguay continental margin; Vema Channel; Walvis Ridge; West Angola Basin; Western Equatorial Atlantic |
| url | https://doi.org/10.1594/PANGAEA.55291 |