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Jökull - 01.01.2017, Qupperneq 27

Jökull - 01.01.2017, Qupperneq 27
Svavarsdóttir et al. Figure 3. cont. (d) The Kvía- hraun lava near Kiðagil. (e) Holocene lava flows of Dyngjuháls to the southeast of Gæsavötn. (f) The pahoe- hoe lavas of Trölladyngja. – Ljósmyndir af hraunum norðan Vatnajökuls. Sciences, University of Iceland. In the case of highly plagioclase phyric samples, plagioclase macrocrysts were separated from the groundmass by handpicking under a binocular microscope. Preferentially, only fresh samples were used, excluding samples show- ing evidence of secondary fillings, organic material or signs of oxidations. Details regarding preparation of the samples prior to ICP-OES analyses can be found in Svavarsdóttir (2017). Assessment of analytical un- certainty associated with these analyses was made by multiple analyses of the rock standard K1919 (a Ki- lauea basaltic standard collected from the same flow as BHVO-1 and provided by Ken Rubin at the Uni- versity of Hawaii). Multi-Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS) Methods adopted for isotopic analyses are in general similar, but improved, to those described by Halldórs- son et al. (2008) and Sigmarsson and Halldórsson (2015) with further details given in Svavarsdóttir (2017). Sr-, Nd-, Hf-, and Pb-isotopic ratios were determined on powdered rock samples with a Nu Plasma MC-ICP-MS at the Institute of Earth Sci- ences, University of Iceland. Strontium isotope ra- tios were normalized to NIST SRM-987 87Sr/86Sr ra- tio of 0.710248 after correction for Rb and Kr inter- ference following Konter and Strom (2014). Sim- ilarly, 143Nd/144Nd was normalized internally to a 22 JÖKULL No. 67, 2017
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