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Early Pliocene paleoceanography of the Vityaz Fracture Zone (VFZ), Central Indian Ridge

DRS at CSIR-National Institute of Oceanography

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Title Early Pliocene paleoceanography of the Vityaz Fracture Zone (VFZ), Central Indian Ridge
 
Creator Guptha, M.V.S.
Banerjee, R.
Mergulhao, L.P.
Banerjee, P.
Parthiban, G.
Tewari, M.
 
Subject palaeoceanography
pliocene
fracture zones
climatic changes
biogenic material
neogene
monsoons
spores
carbonate sediments
Chemical composition
 
Description Planktic foraminifera from the calcareous substrate of a ferromanganese crust in the Vityaz Fracture Zone (VFZ), Central Indian Ridge were studied to reconstruct the early Pliocene paleoceanography of this region. Eleven species of planktic foraminifera were encountered, among them Globorotalia menardii, Neogloboquadrina dutertrei, Globigerina bulloides and Globigerinoides ruber are prominent. Predominance of N. dutertrei in the top 3 cm of the carbonate substrate is attributed to an influx of fresh water which eventually triggered their productivity by increasing the nutrient level. The presence of G. bulloides and G. menardii in significant proportions in deeper layers suggests the prevalence of open ocean upwelling. The bulk chemical compositions of the substrate at different depth intervals indicates higher enrichment of trace metals in the upper sections which could have been supplied through oceanic water by the chemical weathering of terrestrial matter during the peak of Pliocene Asian monsoon. Thus, it is concluded that during the early Pliocene the biogenic components of the substrate were distinctly contributed by both upwelling and productivity triggered by an influx of fresh water originating from the intensification of the Asian monsoon during the early Pliocene Period.
 
Date 2008-01-31T07:07:15Z
2008-01-31T07:07:15Z
2007
 
Type Journal Article
 
Identifier Acta Geologica Sinica, Vol.81; 614-621p.
http://drs.nio.org/drs/handle/2264/727
 
Language en
 
Publisher Geological Society of China