Clay mineraology and grain size composition of surface sediments from South Pacific Ocean
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2011
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| _version_ | 1867168556611796992 |
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| author | Saukel, Cornelia Lamy, Frank Stuut, Jan-Berend W Tiedemann, Ralf Vogt, Christoph |
| author_facet | Saukel, Cornelia Lamy, Frank Stuut, Jan-Berend W Tiedemann, Ralf Vogt, Christoph |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The reconstruction of low-latitude ocean-atmosphere interactions is one of the major issues of (paleo-)environmental studies. The trade winds, extending over 20° to 30° of latitude in both hemispheres, between the subtropical highs and the intertropical convergence zone, are major components of the atmospheric circulation and little is known about their long-term variability on geological time-scales, in particular in the Pacific sector. We present the modern spatial pattern of eolian-derived marine sediments in the eastern equatorial and subtropical Pacific (10°N to 25°S) as a reference data set for the interpretation of SE Pacific paleo-dust records. The terrigenous silt and clay fractions of 75 surface sediment samples have been investigated for their grain-size distribution and clay-mineral compositions, respectively, to identify their provenances and transport agents. Dust delivered to the southeast Pacific from the semi- to hyper-arid areas of Peru and Chile is rather fine-grained (4-8 µm) due to low-level transport within the southeast trade winds. Nevertheless, wind is the dominant transport agent and eolian material is the dominant terrigenous component west of the Peru-Chile Trench south of ~ 5°S. Grain-size distributions alone are insufficient to identify the eolian signal in marine sediments due to authigenic particle formation on the sub-oceanic ridges and abundant volcanic glass around the Galapagos Islands. Together with the clay-mineral compositions of the clay fraction, we have identified the dust lobe extending from the coasts of Peru and Chile onto Galapagos Rise as well as across the equator into the doldrums. Illite is a very useful parameter to identify source areas of dust in this smectite-dominated study area. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_757925 |
| institution | PANGAEA |
| language | en |
| publishDate | 2011 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Clay mineraology and grain size composition of surface sediments from South Pacific Ocean Saukel, Cornelia Lamy, Frank Stuut, Jan-Berend W Tiedemann, Ralf Vogt, Christoph AWI_Paleo; BC; Box corer; Eastern Equatorial Pacific; FD75-3; FD75-3-15; FD75-3-16; GC; Genesis III, RR9702A; Gravity corer; M1; M2; MANOP Site H, Pacific Ocean; ME0005A; ME0005A-14MC2; ME0005A-15MC6; ME0005A-20MC8; ME0005A-21MC3; ME0005A-25MC5; ME0005A-29MC2; ME0005A-35MC1; ME0005A-38MC2; ME0005A-41MC2; Melville; MG1; MG2; MG3; MG4; MUC; MultiCorer; NEMO; North Pacific Ocean; OC73-3; OC73-3-06; Oceanographer; P (20), MG2; Pacific Ocean; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PC; Piston corer; PLDS-2; PLDS-2-33; Pleiades; PLTO03MV; PLUTO-3; PLUTO-3-15; Roger A. Revelle; RP1OC70; RP-1-OC-70; RP1OC70-182P; RP1OC70-186P; RR9702A; RR9702A-50MC4; RR9702A-52MC3; RR9702A-54MC3; RR9702A-60MC2; RR9702A-62MC3; RR9702A-64MC1; RR9702A-66MC1; RR9702A-68MC3; RR9702A-70MC3; RR9702A-72MC3; RR9702A-74MC2; RR9702A-76TC; RR9702A-77MC2; RR9702A-79PC; South Pacific Ocean; ST35 33G; TC; Thomas G. Thompson; Thomas Washington; Trigger corer; TT9108; TT9108_04GC; VLCN-1; VLCN-1-50BC; VNTR01; VNTR01-11GC; VNTR01-12GC; VNTR01-13GC; VNTR01-14GC; VNTR01-15GC; VNTR01-20GC; VNTR01-21GC; VULCAN Leg 1; W7706; W7706-15; W7706-16K; W7706-17; W7706-21; W7706-24; W7706-62; W7706-63K; W7706-65GC; W7706-68GC; W7706-69; W7706-70GC; W7706-71GC; Wecoma; Y69-83; Y69-84; Y69-97; Y71-03; Y71-03-06; Y71-03-08; Y71-03-09; Y71-03-10A; Y71-03-11; Y71-03-13; Y71-03-20; Y71-03-22; Y71-06; Y71-06-26; Y71-07; Y71-07-28; Y71-07-30; Y71-07-31; Y71-07-33; Y71-07-34; Y71-08; Y71-08-76; Y73-03; Y73-03-006; Y73-03-015; Y73-03-020; Y73-03-023; Y73-04; Y73-04-026; Y73-07; Y73-07-094; Y73-07-097; YALOC69; Yaquina The reconstruction of low-latitude ocean-atmosphere interactions is one of the major issues of (paleo-)environmental studies. The trade winds, extending over 20° to 30° of latitude in both hemispheres, between the subtropical highs and the intertropical convergence zone, are major components of the atmospheric circulation and little is known about their long-term variability on geological time-scales, in particular in the Pacific sector. We present the modern spatial pattern of eolian-derived marine sediments in the eastern equatorial and subtropical Pacific (10°N to 25°S) as a reference data set for the interpretation of SE Pacific paleo-dust records. The terrigenous silt and clay fractions of 75 surface sediment samples have been investigated for their grain-size distribution and clay-mineral compositions, respectively, to identify their provenances and transport agents. Dust delivered to the southeast Pacific from the semi- to hyper-arid areas of Peru and Chile is rather fine-grained (4-8 µm) due to low-level transport within the southeast trade winds. Nevertheless, wind is the dominant transport agent and eolian material is the dominant terrigenous component west of the Peru-Chile Trench south of ~ 5°S. Grain-size distributions alone are insufficient to identify the eolian signal in marine sediments due to authigenic particle formation on the sub-oceanic ridges and abundant volcanic glass around the Galapagos Islands. Together with the clay-mineral compositions of the clay fraction, we have identified the dust lobe extending from the coasts of Peru and Chile onto Galapagos Rise as well as across the equator into the doldrums. Illite is a very useful parameter to identify source areas of dust in this smectite-dominated study area. |
| title | Clay mineraology and grain size composition of surface sediments from South Pacific Ocean |
| topic | AWI_Paleo; BC; Box corer; Eastern Equatorial Pacific; FD75-3; FD75-3-15; FD75-3-16; GC; Genesis III, RR9702A; Gravity corer; M1; M2; MANOP Site H, Pacific Ocean; ME0005A; ME0005A-14MC2; ME0005A-15MC6; ME0005A-20MC8; ME0005A-21MC3; ME0005A-25MC5; ME0005A-29MC2; ME0005A-35MC1; ME0005A-38MC2; ME0005A-41MC2; Melville; MG1; MG2; MG3; MG4; MUC; MultiCorer; NEMO; North Pacific Ocean; OC73-3; OC73-3-06; Oceanographer; P (20), MG2; Pacific Ocean; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PC; Piston corer; PLDS-2; PLDS-2-33; Pleiades; PLTO03MV; PLUTO-3; PLUTO-3-15; Roger A. Revelle; RP1OC70; RP-1-OC-70; RP1OC70-182P; RP1OC70-186P; RR9702A; RR9702A-50MC4; RR9702A-52MC3; RR9702A-54MC3; RR9702A-60MC2; RR9702A-62MC3; RR9702A-64MC1; RR9702A-66MC1; RR9702A-68MC3; RR9702A-70MC3; RR9702A-72MC3; RR9702A-74MC2; RR9702A-76TC; RR9702A-77MC2; RR9702A-79PC; South Pacific Ocean; ST35 33G; TC; Thomas G. Thompson; Thomas Washington; Trigger corer; TT9108; TT9108_04GC; VLCN-1; VLCN-1-50BC; VNTR01; VNTR01-11GC; VNTR01-12GC; VNTR01-13GC; VNTR01-14GC; VNTR01-15GC; VNTR01-20GC; VNTR01-21GC; VULCAN Leg 1; W7706; W7706-15; W7706-16K; W7706-17; W7706-21; W7706-24; W7706-62; W7706-63K; W7706-65GC; W7706-68GC; W7706-69; W7706-70GC; W7706-71GC; Wecoma; Y69-83; Y69-84; Y69-97; Y71-03; Y71-03-06; Y71-03-08; Y71-03-09; Y71-03-10A; Y71-03-11; Y71-03-13; Y71-03-20; Y71-03-22; Y71-06; Y71-06-26; Y71-07; Y71-07-28; Y71-07-30; Y71-07-31; Y71-07-33; Y71-07-34; Y71-08; Y71-08-76; Y73-03; Y73-03-006; Y73-03-015; Y73-03-020; Y73-03-023; Y73-04; Y73-04-026; Y73-07; Y73-07-094; Y73-07-097; YALOC69; Yaquina |
| url | https://doi.org/10.1594/PANGAEA.757925 |