Geochemistry of terrigenous material in deep-sea sediments of the equatorial Pacific


Autoria(s): Ziegler, Christa L; Murray, Richard W; Plank, Terry; Hemming, Sidney R
Cobertura

MEDIAN LATITUDE: 0.425844 * MEDIAN LONGITUDE: -135.323761 * SOUTH-BOUND LATITUDE: -11.997300 * WEST-BOUND LONGITUDE: -140.146700 * NORTH-BOUND LATITUDE: 8.930000 * EAST-BOUND LONGITUDE: -110.521430 * DATE/TIME START: 1991-06-13T12:44:00 * DATE/TIME END: 1992-12-06T22:38:00

Data(s)

05/11/2008

Resumo

Biological productivity in the modern equatorial Pacific Ocean, a region with high nutrients and low chlorophyll, is currently limited by the micronutrient Fe. In order to test whether Fe was limiting in the past and to identify potential pathways of Fe delivery that could drive Fe fertilization (i.e., dust delivery from eolian inputs vs. Fe supplied by the Equatorial Undercurrent), we chemically isolated the terrigenous material from sediment along a cross-equatorial transect in the central equatorial Pacific at 140°W and at Ocean Drilling Program Site 850 in the eastern equatorial Pacific. We quantified the contribution from each potential Fe-bearing terrigenous source using a suite of chemical- and isotopic discrimination strategies as well as multivariate statistical techniques. We find that the distribution of the terrigenous sources (i.e., Asian loess, South American ash, Papua New Guinea, and ocean island basalt) varies through time, latitude, and climate. Regardless of which method is used to determine accumulation rate, there also is no relationship between flux of any particular Fe source and climate. Moreover, there is no connection between a particular Fe source or pathway (eolian vs. Undercurrent) to total productivity during the Last Glacial Maximum, Pleistocene glacial episodes, and the Miocene "Biogenic Bloom". This would suggest an alternative process, such as an interoceanic reorganization of nutrient inventories, may be responsible for past changes in total export in the open ocean, rather than simply Fe supply from dust and/or Equatorial Undercurrent processes. Additionally, perhaps a change in Fe source or flux is related to a change in a particular component of the total productivity (e.g., the production of organic matter, calcium carbonate, or biogenic opal).

Formato

application/zip, 7 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.706931

doi:10.1594/PANGAEA.706931

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Ziegler, Christa L; Murray, Richard W; Plank, Terry; Hemming, Sidney R (2008): Sources of Fe to the equatorial Pacific Ocean from the Holocene to Miocene. Earth and Planetary Science Letters, 270(3-4), 258-270, doi:10.1016/j.epsl.2008.03.044

Palavras-Chave #11031300 Multicorer1; 11071651 Pistoncore2; 11080952 Multicorer4; 11091335 Multicorer5; 11101338 Pistoncore5; 11120107 Multicorer8; 11161400 Multicorer11; 11172115 Multicorer12; 11181007 Multicorer13; 11191756 Piston core 8; 11220058 Pistoncore9; 11230530 Multicorer18; 11240508 Multicorer19; 11270742 Multicorer22; 11290827 Multicorer25; 12060614 Spadecore22; 12062238 Multicorer37; 138-850B; Age; AGE; Al; Aluminium; Chromium; Cr; Depth; DEPTH, sediment/rock; DRILL; Drilling/drill rig; e-Nd; epsilon-Neodymium; Equatorial Pacific; Event; ICP-MS, Inductively coupled plasma - mass spectrometry; JGOFS; Joides Resolution; Joint Global Ocean Flux Study; Leg138; Mass spectrometer Finnigan MAT 252; MUC; MultiCorer; Nb; Niobium; North Pacific Ocean; Ocean Drilling Program; ODP; ODP sample designation; PC; Piston corer; Rb; Rubidium; Sample code/label; Spade box corer; Stage; Thomas G. Thompson; Ti; Time window; Titanium; TT013; TT013_104; TT013_113; TT013_144; TT013_148; TT013_18; TT013_23; TT013_27; TT013_32; TT013_4; TT013_41; TT013_58; TT013_63; TT013_66; TT013_72; TT013_83; TT013_88; TT013_93; VEGBOXC
Tipo

Dataset