Multiple Pulses of the Mantle Plume: Evidence fromTertiary Icelandic Lavas
We present major and trace element concentrations and Sr^Nd^ Hf^Pb isotope data for the c. 13^2Ma Tertiary lavas from east-ern Iceland. Our new geochemical results, together with published geological, geochronological, geochemical and geophysical data, are used to evaluate temporal changes in mantle...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2007
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.5744 http://petrology.oxfordjournals.org/content/49/7/1365.full.pdf |
| Summary: | We present major and trace element concentrations and Sr^Nd^ Hf^Pb isotope data for the c. 13^2Ma Tertiary lavas from east-ern Iceland. Our new geochemical results, together with published geological, geochronological, geochemical and geophysical data, are used to evaluate temporal changes in mantle sources contributing to the Tertiary Icelandic magmatism and the relative roles of these sources in magma productivity. The trace element and radiogenic isotopic compositions clearly distinguish three distinct end-member components in the Tertiary magmatism. Temporal variations in lava geochemistry can be attributed to changes in the relative con-tributions of these three end-member components to the erupted magmas and correlated with temporal variations in magma productivity. The extrusion of lavas with geochemically and isotopically enriched compositions was particularly pronounced at 13^12 and 8^7Ma, coincident in time with higher magma pro- |
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