Early Pliocene Paleoceanography of the Vityaz Fracture Zone, Central Indian Ridge |
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作者姓名: | M. V. S. GUPTHA Ran adip BANERJEE Lina P. MERGULHAO Priyanka BANERJEE G. PARTHIBAN Manish TEWARI |
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作者单位: | [1]National Institute of Oceanography, Dona Paula, Goa-403 004, India [2]Department of Geological Sciences, Jadavpur University, Kolkata, 700032, India [3]Physical Research Laboratory, Navrangpura, Ahmedabad, India |
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摘 要: | 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 tuber 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.
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关 键 词: | 上新世 地裂 印度 地壳 |
修稿时间: | 2006-03-302007-04-15 |
Early Pliocene Paleoceanography of the Vityaz Fracture Zone, Central Indian Ridge |
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Authors: | MVSGUPTHA Ranadip BANERJEE Lina PMERGULHAO Priyanka BANERJEE GPARTHIBAN and Manish TEWARI National Institute of Oceanography Dona Paul Goa- Indi |
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Institution: | M.V.S.GUPTHA,Ranadip BANERJEE,Lina P.MERGULHAO,Priyanka BANERJEE,G.PARTHIBAN and Manish TEWARI National Institute of Oceanography,Dona Paul,Goa-,Indi,Department of Geological Sciences,Jadavpur University,Kolkat,Indi,Physical Research Laboratory,Navrangpur,Ahmedaba,India |
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Abstract: | 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. |
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Keywords: | Central Indian Ridge Vityaz Fracture Zone ferromanganese crust biogenic bloom freshwater influx Neogene climate change spores Asian monsoon |
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