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Chemical and isotope data were obtained for the active gas and noble gas of inclusion fluids in coarse-grained samples of magmatic-hydrothermal and magmatic-steam alunite from well-studied deposits (Marysvale, Utah; Tambo, Chile; Tapajós, Brazil; Cactus, California; Pierina, Peru), most of which are discussed in this Volume. Primary fluid inclusions in the alunite typically are less than 0.2 μm but...
New data from the Reykjanes Peninsula, Iceland, show that 3 He/ 4 He ratios of subglacial basaltic glasses are well correlated with CaO/Al 2 O 3 . High CaO/Al 2 O 3 ratios are likely due to assimilation of lower crustal clinopyroxene and the large variations in 3 He/ 4 He likely result from addition of crustal 4 He to the magma...
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