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Jökull - 01.01.2017, Qupperneq 23

Jökull - 01.01.2017, Qupperneq 23
Svavarsdóttir et al. Figure 1. The Bárðarbunga volcanic system with its subglacial central volcano and its extensive fissure swarm (strippled outline). The Veiðivötn fissure swarm extends to the southwest of the Bárðarbunga central volcano. Box 1 denotes the location of Bárðardalur valley and box 2 the Þjórsárhraun lava. Map from Larsen and Guð- mundsson (2016). – Kort af eldstöðvakerfi Bárðarbungu sem sýnir sprungusveim (brotalína) og megineldstöð kerfisins, ásamt hraunum sem eru talin tengjast kerfinu og runnið hafa til strandar norðanlands og sunnan. Hraun sem runnið hafa eftir landnám eru í ljósari lit. Jakobsson (1979) used major and minor elements to assign lava units to their source, and this method has been widely adopted to trace the origin of tephra layers in Iceland (e.g., Larsen and Eiríksson, 2008). When adopting this "fingerprint" method, it is impor- tant to keep in mind that crustal processes affecting the melt after it has left its source may strongly mod- ify its primary chemical characteristics, adding further complexities to inherent heterogeneity of the erupted magma (e.g., Maclennan et al., 2003; Shorttle et al., 2013). However, radiogenic isotopic tracers should, in theory, not be modified during transport of a melt from its source to the surface, particularly when con- sidering long-lived isotopes with half-lives exceeding the age of the Icelandic crust (e.g., Sr, Nd, Hf, and Pb). This is particularly true when magmas do not need to bypass a seawater-altered crust in which radiogenic Sr enrichment can occur. Thus, measured isotope 18 JÖKULL No. 67, 2017
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