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Minerals, Volume 15, Issue 7
July 2025 - 102 articles
Cover Story: The Tungnárhraun basalts (S. Iceland) erupted during the Holocene deglaciation. The lavas contained An-rich plagioclase macrocrysts that did not grow in the host lavas. Through thermobarometry, three distinct storage regions are revealed. A lower-crustal mush zone is fed by primitive, low-87Sr/86Sr magmas, and plagioclase growth is controlled by a pseudoazeotrope. Rapid magma ascent to the mid-crust reestablishes conventional feldspar phase constraints; plag growth releases heat; and olivine and pyroxene resorption provides the magmas with high levels of CaO/Al2O3 and Sc. MgO-rich lavas erupt directly or ascend to shallow storage, where they evolve to contain lower levels of MgO. Differences in Sr isotopes between plagioclase and carrier melts suggest minor crustal assimilation. This transcrustal system likely influenced much of the Icelandic magmatism in the Holocene. View this paper
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Minerals - ISSN 2075-163XCreative Common CC BY license