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Argon system behavior in a young volcanic system has been investigated through analysis of alkali feldspar phenocrysts and glass separates in order to constrain the potential effects of excess Ar upon 40 Ar– 39 Ar ages on feldspars and the crystal/melt partition coefficient. The importance of syn-and post-emplacement processes was investigated by sampling glass and pumice clasts derived...
Basaltic rocks from Shuangliao, northeast China include basanite, alkali olivine basalt, transitional basalt and sub-alkaline diabase. Ar–Ar dating shows that the basanites and alkali olivine basalts formed earlier (48.5–51Ma) than the transitional basalts and diabases (43–41.6Ma). These rocks have the highest Fe 2 O 3 contents (13.4–14.6wt.%) and lowest ( 87 Sr/ 86 ...
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