Abstract
The importance of volatile components in the generation and crystallization of alkaline rocks has been emphasized by a number of authors (see review by Kogarko, 1974). ane method of determining the character of the volatile components associated with natural magmatism is to study the volatiles trapped as fluid inclusions in minerals during formation of the rocks. Although there may often be difficulties in relating the volatiles observed in fluid inclusions in minerals to those present in the melt at the time of solidification, this approach is considered to provide a potential method for determining the characteristics of volatiles associated with formation of natural rocks.
Highlights
The importance of volatile components in the generation and crystallization of alkaline rocks has been emphasized by a number of authors. ane method of determining the character of the volatile components associated with natural magmatism is to study the volatiles trapped as fluid inc1usions in minerals during formation of the rocks
The data points falllargely along a line originating in the atmospheric composition point, suggesting that the observed variation is due to varying atmospheric contamination
The contribution from radioactive decay ean be calculated from the age of the Ilfmaussaq intrusion and
Summary
The importance of volatile components in the generation and crystallization of alkaline rocks has been emphasized by a number of authors (see review by Kogarko, 1974). ane method of determining the character of the volatile components associated with natural magmatism is to study the volatiles trapped as fluid inc1usions in minerals during formation of the rocks. Analyses of the gases in fluid inc1usions in Ilfmaussaq minerals and whole rocks show them to be composed predominantly of hydrocarbons (especiaIly CH4), varying amounts of hydrogen, and minor amounts of He, CO2 and/or CO (Petersi1ie & Sørensen, 1970; Konnerup-Madsen et al, 1979).
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