H. Kawahata et N. Eguchi, BIOGENIC SEDIMENTS ON THE EAURIPIK RISE OF THE WESTERN EQUATORIAL PACIFIC DURING THE LATE PLEISTOCENE, Geochemical Journal, 30(4), 1996, pp. 201-215
It has been suggested that late Quaternary variability in atmospheric
CO2 concentrations may have resulted from variations in the nature of
biogenic sedimentation. In this paper we present 262 kyr time series f
or the mass accumulation rates of organic carbon (MAR(OC)), carbonate
(MAR(Carbonate)), and biogenic opal (MAR(Opal)) of the Eauripik Rise,
the western equatorial Pacific. The MAR(OC) record exhibits a general
trend of higher values during glaciation time; Stage 2, Stage 3, Stage
4, Stage 6 and late Stage 8 except middle Stage 5. A weak correlation
between MAR(OC) and MAR(Opal) as well as MAR(Carbonate) is attributed
to the oligotrophic character of the western Pacific in the Eauripik
Rise area. Spectral analysis of organic carbon contents displays eccen
tricity, obliquity and precession-related peaks. The presence of 23-ky
r periodicity indicates a possible link between organic carbon burial
and trade winds associated with insolation.