Comparison between element concentrations in mafic melt inclusions trapped in amphibole from an intrusion (ML3/5) and from extrusive rocks of various ages (NB5B and NB31A). The close similarity between the compositions suggests that both rock types were generated from the same primary magma. Also shown is the comparison between the melt inclusion from sample ML3/5 and a lamprophyre dyke emplaced in the Capillitas valley (CAP 4, CAP 5; Halter et al. 2004a). This dyke has a bulk composition most similar to that of the most mafic melt inclusions and could represent the most pristine mafic magma endmember
Figure 6 shows similar compositions of such a mafic inclusion from an intrusive rock and inclusions from extrusive rocks of various ages.
Evidence for a constant composition of the most mafic magma is provided by constant compositions of the most mafic melt inclusions in amphiboles of rocks of various ages (Fig. 6 ).
The similarity in composition of these inclusions in intrusive and extrusive rocks (Fig. 6 ) suggests a common source for the mafic melt in both rock types.
Characteristic differences between intrusive and extrusive rocks (Fig. 8 ), despite a common source (Fig. 6 ), show that intrusions tapped different parts of this magma chamber than did volcanic rocks.
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