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dc.contributor.authorGuptha, M.V.S.
dc.contributor.authorBanerjee, R.
dc.contributor.authorMergulhao, L.P.
dc.contributor.authorBanerjee, P.
dc.contributor.authorParthiban, G.
dc.contributor.authorTewari, M.
dc.date.accessioned2008-01-31T07:07:15Z
dc.date.available2008-01-31T07:07:15Z
dc.date.issued2007
dc.identifier.citationActa Geologica Sinica, Vol.81; 614-621p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/727
dc.description.abstractPlanktic 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.
dc.language.isoen
dc.publisherGeological Society of China
dc.subjectpalaeoceanography
dc.subjectpliocene
dc.subjectfracture zones
dc.subjectclimatic changes
dc.subjectbiogenic material
dc.subjectneogene
dc.subjectmonsoons
dc.subjectspores
dc.subjectcarbonate sediments
dc.subjectChemical composition
dc.titleEarly Pliocene paleoceanography of the Vityaz Fracture Zone (VFZ), Central Indian Ridge
dc.typeJournal Article


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