Biostratigraphy of tropical and equatorial Pleistocene nannofossils for ODP Leg 202

During Ocean Drilling Program (ODP) Leg 202, Pleistocene calcareous nannofossils were recovered from several sites situated between 16°S and 8°N latitude. These sites are under the influence of coastal or equatorial upwelling and offer the opportunity to refine biostratigraphic patterns using alternative events from those used in "standard" zonations (Martini, 1971; Okada and Bukry, 1980, doi:10.1016/0377-8398(80)90016-X). Differences in the positions of the studied sites determine changes in sedimentation rates, which range from ~0.8 to 6 cm/k.y. (Shipboard Scientific Party, 2003, doi:10.2973/odp.proc.ir.202.101.2003). These differences are due to the proximity to the continent and to organic production.在大洋钻探计划（Ocean Drilling Program, ODP）第202航次中，研究人员从纬度介于南纬16°至北纬8°的多个站位采获了更新世钙质超微化石（calcareous nannofossils）。这些站位受沿岸上升流或赤道上升流影响，为利用不同于“标准”生物地层分带所采用的标志性事件（Martini, 1971; Okada and Bukry, 1980, doi:10.1016/0377-8398(80)90016-X）优化生物地层格架提供了契机。 研究站位的位置差异会导致沉积速率发生变化，其范围约为0.8至6厘米/千年（船上科学工作组, 2003, doi:10.2973/odp.proc.ir.202.101.2003）。该差异源于站位与大陆的邻近程度以及海洋有机生产力的差异。