Les inclusions fluides des minéraux des syénites agpaïtiques à néphéline et des filons hydrothermaux de l'intrusion alcaline d'Ilímaussaq (Groenland du Sud) sont très riches en hydrocarbures (principalement en méthane) tandis que les pourcentages de CO2 et CO sont insignifiants. Les hydrocarbures sont considérés comme d'origine inorganique et comme reflétant des fugacités d'oxygène très basses pendant la cristallisation. Il est proposé que ces fluides ont été piégés comme des gouttelettes immiscibles dans une solution aqueuse très saline (33 à 46 % poids en équivalents NaCl). Des inclusions isolées, riches en hydrocarbures, indiquent des conditions de capture comprises entre 800-500° C et 1,4-0,8 kbar.
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.
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