Clay mineraology and grain size composition of surface sediments from South Pacific Ocean, supplement to: Saukel, Cornelia; Lamy, Frank; Stuut, Jan-Berend W; Tiedemann, Ralf; Vogt, Christoph (2011): Distribution and provenance of wind-blown SE Pacific surface sediments. Marine Geology, 280(1-4), 130-142


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.

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Metadata Access
Creator Saukel, Cornelia; Lamy, Frank; Stuut, Jan-Berend W; Tiedemann, Ralf; Vogt, Christoph
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2011
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 4 datasets
Discipline Earth System Research
Spatial Coverage (-102.573W, -23.606S, -71.128E, 9.588N); South Pacific Ocean; Pacific Ocean; North Pacific Ocean; MANOP Site H, Pacific Ocean
Temporal Coverage Begin 1971-09-23T00:00:00Z
Temporal Coverage End 1989-09-29T00:00:00Z