1975
DOI: 10.1016/0033-5894(75)90025-3
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Paleoclimatic Significance of Quartz/Illite Variations in Cores from the Eastern Equatorial North Atlantic

Abstract: Detailed X-ray diffraction analysis of cores taken in the eastern equatorial Atlantic suggest that during approximately the last 600,000 yr a relatively constant background of clay mineral deposition has existed on which are superimposed large oscillations in quartz input (relative to illite). The quartz is transported from the Sahara Desert by the northeast trade winds and the quartz/illite oscillations appear to reflect past changes in the transporting effectiveness (intensity) of the trade winds. Comparison… Show more

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Cited by 46 publications
(21 citation statements)
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“…The relative abundance of the clay mineral assemblages is in good agreement with various previous studies (Biscaye, 1965;Griffin et al, 1968;Bowles, 1975). We presume …”
Section: Mineralogy Of Green Grainssupporting
confidence: 80%
“…The relative abundance of the clay mineral assemblages is in good agreement with various previous studies (Biscaye, 1965;Griffin et al, 1968;Bowles, 1975). We presume …”
Section: Mineralogy Of Green Grainssupporting
confidence: 80%
“…Occurring in minor quantities are gibbsite, clinoptilolite, pyrite, and feldspar. The relative abundance of the clay minerals is in good agreement with various previous works (Biscaye, 1965;Griffin et al, 1968;Bowles, 1975). Cold and warm periods were analyzed; no significant changes in the relative abundance of the clay minerals were found, suggesting that the climatic changes of the Pleistocene had little effect on the production and deposition of clay minerals in this margin.…”
Section: Clay Minerals and Other Mineralogical Indicatorssupporting
confidence: 76%
“…For the most part, the highest content of illite parallels the glacial stages (4, 6, 12, 16, 20, and 22), but some of them correspond to interglacial stages (13, 21, and 25) One of the preliminary working hypotheses was a possible quartz supply from the Sahara desert or from the northern Chad area by the northeast Trade Winds to this southern boundary. Bowles (1975) in the eastern equatorial North Atlantic (4°-9°N) compared quartz/illite variations of the bulk sample with paleotemperature variations and suggested that major inputs of quartz correlate with cold periods. Our purpose was to apply the same method in our more intertropical environment.…”
Section: Clay Minerals and Other Mineralogical Indicatorsmentioning
confidence: 99%
“…Enhanced inputs of aeolian dust, and in some cases dune sand, to Atlantic Ocean cores off west Africa (Sarnthein and Diester-Haass, 1977;Kolla, Biscaye and Hanley, 1979;Holz, Stuut and Hentrich, 2004), downwind from the Australian deserts (Thiede, 1979;Hesse and McTainsh, 1999) and in the Arabian Sea (Kolla and Biscaye, 1977) occurred within Quaternary cold periods. The relationship holds for at least the last 600 000 years (Emiliani, 1966;Bowles, 1975), while dust is detectable almost back to 2 million years BP in some core sediments (Parmenter and Folger, 1974).…”
Section: Marine Sediments and Palaeoariditymentioning
confidence: 95%