Publication: EXPRESS LETTER
Helium isotopic ratios in fluid inclusions from fluorite-rich Mississippi Valley-
Type district of Asturias, northern Spain
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Publication Date
2010
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The Geochemical Society of Japan
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Abstract
Helium isotopes have been measured in fluorite and sulphides from fluorite-rich Mississippi Valley-type (MVT) deposits
from Asturias, Spain, in order to assess the involvement of mantle and crust-derived volatiles in the genesis of the
deposits. The 3He/4He of the ore fluids are ≤0.1 Ra ruling out a contribution of mantle-derived magmatic helium in the
inclusion fluids. Data support a crustal source for the volatiles and is consistent with the existing basinal model for the
genesis of the Asturias MVT mineralization by mixing of sedimentary brines with infiltrating superficial fluids.