Atmospheric and juvenile noble gases in the Skaergaard layered igneous intrusion

Details Atmospheric and juvenile noble gases in the Skaergaard layered igneous intrusion Atmospheric and juvenile noble gases in the Skaergaard layered igneous intrusion

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1033s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, May 1984, p. 1033-1041. Research supported by the Ford Motor Co.

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2

Gas Composition, Igneous Rocks, Petrology, Rare Gases, Rock Intrusions, Argon Isotopes, Diorite, Earth Atmosphere, Gabbro, Neon Isotopes, Subduction (Geology)

Scientific paper

Gabbro and diorite from the Skaergaard layered igneous intrusion contain noble gases which are mixtures of atmospheric and juvenile components. Atmospheric noble gases predominate in samples that have undergone extensive oxygen isotope exchange with meteoric-hydrothermal water. The source of the atmospheric noble gas component is inferred to be the hydrothermal circulation system. A juvenile component with Ar-40/Ar-36 not less than about 6100 and containing fission xenon is also present. This component predominates in samples showing unaltered magmatic oxygen isotope compositions. Neon of atmospheric isotopic composition is associated with the juvenile radiogenic Ar-40 and fission xenon. The source of this second noble gas component may be either the crustal country rock or the upper mantle. If the neon is juvenile primordial neon from a mantle source region, terrestrial primordial Ne-20/Ne-22 is the same as atmospheric to within 4 percent. However, subduction of atmospheric noble gases into the upper mantle may provide an alternate source of neon and other noble gases in the mantle.

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