Abstract
We investigated the calcareous nannofossils in the western Pacific and Bahama Bank of Caribbean Sea to reconstruct the paleoceanography and correlate with the global events. The absolute abundant of coccolith (number/g) are gradually increased from NN6 throughout NN19 Zone, while the relative abundance of Discoaster is decreased at Sites 782 in the western Pacific Ocean. The changes of the modal and maximum size of Reticulofenestra which are strongly reflected the collapse of sea surface stability, show four times in 8.8 Ma, 6.4 Ma, 5.4 Ma and 3.75 Ma at Site 782. On the basis of relationship between the changes of maximum sizes of Reticulofenestra and nutrient condition, these eutrophication events are clearly traceable to the western Pacific, Bahama Bank, northwestern Pacific Ocean and to the Indian Ocean. Two paleoceanographic events found in 8.8 Ma and 3.75 Ma are interpreted as change to high nutrient condition resulted in the intensification of Asian Monsoon and closure of Panama Isthmus.
Highlights
Coccolithophorids, which live in photic zone of world Ocean, are considered to be sensitive to changes in sea surface temperature and nutrient conditions
Our results indicated that the size of Reticulofenestra increased five times throughout the section
It drastically decreased in NN8-10 (8.8 Ma), NN12-13 (5.4 Ma), NN14-NN15 (3.75 Ma), NN17/NN18 (2.514 Ma) and in NN19 Zone (0.8 Ma) in the western Pacific site
Summary
Coccolithophorids, which live in photic zone of world Ocean, are considered to be sensitive to changes in sea surface temperature and nutrient conditions. As these reasons, nannofossils, fossil of Coccolithophorids, are useful for biostratigraphy and for paleoceanographical reconstruction of Mesozoic and Cenozoic ages. The ecological characteristic of Florisphaera profunda is applicable to reconstruction of paleoceanographic conditions on stability and nutrient conditions of surface Ocean. Stoll et al [6] interpreted that Discoaster lived in lower photic zone based on Sr of discoasters in the Paleogene sequence This indicates that the discoasters are useful tool for reconstruction of paleoceanographic conditions such as ocean surface stability
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