Abstract:
Mt. Eggvin is a large, discrete volcanic seamount located at 70°56.9’N, 13°02.1’W on the eastern wall of the axial valley of the Northern Kolbeinsey Ridge (NKR). It is the largest volcanic feature on the anomalously shallow Eggvin Bank. The magma source for the NKR is characterized by long-term chemical and isotopic enrichment, but the origin of the enriched source is under debate. To examine the source of this volcano and regional enrichment, I present new trace element measurements of seven basaltic samples, including two popping rock basalts and five glassy samples. Mt. Eggvin samples were found to be more enriched in incompatible elements (La/SmN = 2.1-2.3, Sm/YbN = 1.2-1.3) than the surrounding NKR (La/SmN = 1.6-1.9, Sm/YbN = 0.9), which is approaching Jan Mayen Island basalt enrichment (La/SmN= 4.3, Sm/YbN = 3.8). New, higher resolution bathymetric mapping and image analysis of Mt. Eggvin’s morphology reveal smooth, steep slopes that suggest the volcano is distinct from the NKR and has higher magma flux. The enriched composition and high magma flux to Mt. Eggvin is likely the result of mantle mixing with an increased magma supply from neighboring hotspot, Jan Mayen Island.
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