TITLE:
Reconstruction of Paleoceanography Significance in the Western Pacific and Atlantic Oceans during the Neogene Based on Calcareous Nannofossil Productivity and Size Variations, Related to the Global Tectonic Events
AUTHORS:
Santi Dwi Pratiwi, Tokiyuki Sato
KEYWORDS:
Calcareous Nannofossils, Paleoceanography, Coccolith (Number/g), Discoaster, Reticulofenestra, Eutrophication Events, Paleoceanographic Events
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.8,
August
30,
2016
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.