(Table 1) Age, porocity, density, mass accumulation rates and grain size of the eolian component of sediments from DSDP Leg 92, supplement to: Bloomstine, Maurice K; Rea, David K (1986): Post-middle Oligocene Eolian deposition from the trade winds of the Southeast Pacific. In: Leinen, M; Rea DK; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 92, 331-340


Eolian dust preserved in deep-sea sediments provides a record of atmospheric circulation throughout geologic time. This eolian component has been isolated to determine its mass accumulation rate (MAR) and grain size in post-middle Oligocene sediments from DSDP Sites 597 to 602, which lie along 19°S on the East Pacific Rise. The rate of eolian deposition has been very low (about 2 to 3 mg/(cm2 x 103 yr) and reasonably consistent at all the sites, except that the MAR of the eolian component at Site 597 increases to an average of about 8 mg/(cm2 x 103 yr) between 17 and 19 Ma. Eolian grain size at Site 598 changes dramatically at 10.5 Ma from 7.2 phi in younger sediments to 8.2 phi in older material and may provide evidence of an intensification of zonal winds that took place in response to Antarctic ice formation just prior to that time. Pliocene to Pleistocene samples from Leg 92 show no evidence of the severalfold increase in dust accumulation and grain size recorded at Northern Hemisphere locations at the time corresponding to the onset of Northern Hemisphere glaciation. The low and constant flux of eolian material indicates that South America was consistently vegetated from post-middle Oligocene time to the present.

DOI https://doi.org/10.1594/PANGAEA.789710
Related Identifier https://doi.org/10.2973/dsdp.proc.92.114.1986
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.789710
Creator Bloomstine, Maurice K; Rea, David K
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1986
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 1384 data points
Discipline Earth System Research
Spatial Coverage (-129.770W, -19.451S, -116.840E, -18.806N); South Pacific; South Pacific/PLATEAU; South Pacific/CONT RISE; South Pacific/TROUGH
Temporal Coverage Begin 1983-03-02T00:00:00Z
Temporal Coverage End 1983-03-26T00:00:00Z