Jökull

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Jökull - 01.01.2017, Qupperneq 42

Jökull - 01.01.2017, Qupperneq 42
Holocene lavas in Bárðardalur, NE-Iceland Figure 10. (a) Sr-Nd-isotopic variations of samples from the Bárðardalur region compared to volcanic prod- ucts associated with Bárðarbunga and Askja. (b) Sr-Hf-isotopic variations of samples from the Bárðardalur region compared to volcanic products associated with Bárðarbunga. (c) Nd-Hf-isotopic variations of samples from the Bárðardalur region compared to volcanic products associated with Bárðarbunga. (d) 208Pb/204Pb vs. 206Pb/204Pb isotopic variations of samples from the Bárðardalur region compared to volcanic products associated with Bárðarbunga and Askja. – (a-d) Sr-Nd-Hf-Pb samsætu breytileiki hraunsýna úr Bárðardal í samanburði við goseiningar tengdar Bárðarbungu og Öskju. 2008; Manning and Thirlwall, 2014). We noted ear- lier that the major, minor and trace element chemistry of Bárðarbunga basement rocks and the eruptive units north of Vatnajökull defines a depleted endmember of the Bárðarbunga volcanic system. Thus, the data pre- sented in this study, along with previously published data from the Veiðivötn region, provide a more exten- sive view of the isotopic variability of the entire Bárð- arbunga volcanic system. On the basis of the chem- ical and isotopic data reported here, the Bárðarbunga volcanic system, particularly its northern segment, is regarded as being the most likely source for the lavas of Bárðardalur valley. Petrochemistry of the Northern Rift Zone: Future prospects In order to obtain better constraints on the total num- ber of volcanic systems along the NRZ, their associ- ation with each other and possible evolution of their products with time, it is important to acquire data from as many volcanic units as possible along the JÖKULL No. 67, 2017 37
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