Other
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32...11f&link_type=abstract
Earth and Planetary Science Letters, Volume 32, Issue 1, p. 11-17.
Other
11
Scientific paper
New oxygen isotope analyses have been obtained on 31 rocks and minerals from the Tertiary ring-dike complex on the Isle of Mull, Scotland. Whole-rock δ 18O values (SMOW) of basalts range from +9.1 to -6.5, and systematically decrease toward the central plutonic complex. The δ 18O values of the intrusive igneous rocks systematically increase with successively younger ages of emplacement, presumably because the meteoric-hydrothermal systems decreased in intensity with time, as a result of waning igneous activity and mineral deposition within the conduit fractures. Whole-rock δ 18O values of intrusions around the Beinn Chaisgidle center show a narrow range from -3.9 to -1.5, whereas those about the later Loch Ba center can be divided into two groups, the earliest with δ 18O = -3.3 to +0.5, and the latest with δ 18O = +1.0 to +3.4.All of the rocks within the ``limit of pneumatolysis'', a zone of hydrothermal contact metamorphism that lies 4-6 km outward from the central intrusions, are depleted in 18O, some by as much as 13‰. These effects are observed over an area of 500 km2, and were produced by meteoric-hydrothermal convective circulation of early Tertiary ground waters, which apparently had initial δ 18O values of about -11 to -12.
Forester Richard W.
Taylor Hugh P.
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