TY - JOUR
T1 - Late Neogene to Pleistocene palynological facies of the Peruvian continental margin upwelling, Leg 112
AU - Powell, A. J.
AU - Dodge, J. D.
AU - Lewis, J.
PY - 1990/6/8
Y1 - 1990/6/8
N2 - The main objectives of this study are (1) to characterize the spatial and temporal variations in organic matter deposited in upwelling and related sediments (manifest in the palynoclast and organic-walled microplankton assemblages) and (2) to relate these variations to paleoenvironmental changes. A total of 40 samples from Holes 679D, 680B, 681B, 686B, and 687B were analyzed. Cysts of heterotrophic peridiniacean dinoflagellates (P-cysts) dominate the microplankton assemblages, with variable levels of cysts of autotrophic gonyaulacacean dinoflagellates (G-cysts). Samples dominated by P-cysts are derived largely from laminated, unbioturbated units deposited under the influence of strong upwelling. A lower abundance of P-cysts in some samples is restricted to unlaminated, bioturbated units deposited under oxygenated conditions. We conclude that the ratio of P-cysts to G-cysts is a useful indicator of variable upwelling strength. -from Authors
AB - The main objectives of this study are (1) to characterize the spatial and temporal variations in organic matter deposited in upwelling and related sediments (manifest in the palynoclast and organic-walled microplankton assemblages) and (2) to relate these variations to paleoenvironmental changes. A total of 40 samples from Holes 679D, 680B, 681B, 686B, and 687B were analyzed. Cysts of heterotrophic peridiniacean dinoflagellates (P-cysts) dominate the microplankton assemblages, with variable levels of cysts of autotrophic gonyaulacacean dinoflagellates (G-cysts). Samples dominated by P-cysts are derived largely from laminated, unbioturbated units deposited under the influence of strong upwelling. A lower abundance of P-cysts in some samples is restricted to unlaminated, bioturbated units deposited under oxygenated conditions. We conclude that the ratio of P-cysts to G-cysts is a useful indicator of variable upwelling strength. -from Authors
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U2 - 10.2973/odp.proc.sr.112.196.1990
DO - 10.2973/odp.proc.sr.112.196.1990
M3 - Article
AN - SCOPUS:0025683702
SP - 297
EP - 321
JO - Scientific Results
JF - Scientific Results
ER -