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Volcanogenic nutrient fluxes and plant ecosystems in large igneous provinces: an example from the Columbia River Basalt Group

DAVID W. JOLLEY, MIKE WIDDOWSON and STEPHEN SELF
Journal of the Geological Society, 165, 955-966, 13 August 2008, https://doi.org/10.1144/0016-76492006-199
DAVID W. JOLLEY
1Department of Geology and Petroleum Geology, Meston Building, King's College, Aberdeen AB24 3UE, UK (e-mail: )
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MIKE WIDDOWSON
2Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK
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STEPHEN SELF
2Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK
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Abstract

Research from biological and geological sources has highlighted the role of volcanoes in the outgassing of P, and thermal fixation and subsequent atmospheric oxidation of NOx in volcanic environments. The impact of these nutrient fluxes on biological systems has been demonstrated on present-day Hawai'i, and here we consider the impact on the plant communities within a large igneous province (LIP). The Miocene Columbia River Basalt Province, the youngest LIP on Earth, contains many sedimentary interbeds between the flows of the major extrusive phase, and these interbeds preserve variable but often diverse palynofloras. By integration of palynofloral analysis with analysis of macronutrient levels in the interbeds it can be suggested that there may have been significantly elevated levels of P within the lava field proximal to the source vents, a distribution mirrored by Ca and Mg. Evidence for potential volcanogenic eutrophication is restricted to >103 year duration interbeds, contemporary with eruptive activity elsewhere in the LIP. The geochemistry and palynology of other interbeds demonstrate nutrient deficiency, with a potential route to nutrient sufficiency available from long-term symbiotic N-fixation. Elsewhere within the Columbia River Basalt Province, this process is short-circuited by the imput of felsic ash from the nearby Cascades Range of volcanoes.

  • © 2008 The Geological Society of London
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Journal of the Geological Society: 165 (5)
Journal of the Geological Society
Volume 165, Issue 5
September 2008
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Volcanogenic nutrient fluxes and plant ecosystems in large igneous provinces: an example from the Columbia River Basalt Group

DAVID W. JOLLEY, MIKE WIDDOWSON and STEPHEN SELF
Journal of the Geological Society, 165, 955-966, 13 August 2008, https://doi.org/10.1144/0016-76492006-199
DAVID W. JOLLEY
1Department of Geology and Petroleum Geology, Meston Building, King's College, Aberdeen AB24 3UE, UK (e-mail: )
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MIKE WIDDOWSON
2Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK
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STEPHEN SELF
2Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK
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Volcanogenic nutrient fluxes and plant ecosystems in large igneous provinces: an example from the Columbia River Basalt Group

DAVID W. JOLLEY, MIKE WIDDOWSON and STEPHEN SELF
Journal of the Geological Society, 165, 955-966, 13 August 2008, https://doi.org/10.1144/0016-76492006-199
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  • Article
    • Abstract
    • Nutrient flow in present-day volcanic environments
    • Macronutrient availability
    • Estimating NOx flux from LIP lava-field eruption
    • Nutrient flux in LIPs
    • Analytical techniques
    • Nutrient flux within the Columbia River Large Igneous Province
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