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Total alkali vs. silica diagram after Le Bas et al. (1986) for the CPR's "western segment" Middle Miocene volcanic rocks as a reference field (solid black outline; see Kovács and Szabó 2008 for references) and the Börzsöny samples (squares, with colors corresponding to the stages of volcanic activity: red-first, yellowsecond, green-third)

Total alkali vs. silica diagram after Le Bas et al. (1986) for the CPR's "western segment" Middle Miocene volcanic rocks as a reference field (solid black outline; see Kovács and Szabó 2008 for references) and the Börzsöny samples (squares, with colors corresponding to the stages of volcanic activity: red-first, yellowsecond, green-third)

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Fig. 1 Geologic map of Börzsöny Mts., with the sampling sites, and...
Fig. 2 Photomicrograph of thin sections from the representative samples...
Table 2 Published literature data of volcanic phenocryst trace water...
Fig. 3 Total alkali vs. silica diagram after Le Bas et al. (1986) for...
+2 Table 3 Bulk rock geochemistry, where available; the data from Karátson...
On the use of nominally anhydrous minerals as phenocrysts in volcanic rocks: A review including a case study from the Carpathian-Pannonian Region
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  • Mar 2019
The past decade has seen a great number of studies dealing with magmatic water contents and how these could be retrieved by the nominally anhydrous minerals' (NAMs) trace structural hydroxyl (water) contents. Constraints have been made to magmatic hygrometry with clinopyroxene and plagioclase. Although results suggest that the method is more flexib...
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Context 1
... elements. The bulk rock major element compositions were plotted on a total alkali silica (TAS) diagram (Fig. 3), where the samples correspond to dacitic and andesitic assemblages. SiO 2 contents decrease from the first volcanic period toward the subsequent ones. The samples from the second volcanic phase show the highest total alkali content. The samples of the third period are andesitic. The polygon outlined by a solid black line shows the ...
Context 2
... to the TAS diagram ( Fig. 3; Le Bas et al. 1986), the older volcanic products of the volcanism of Börzsöny Mts. are richer in SiO 2 ; after the first dacitic rocks, andesitic ones were formed (Karátson et al. 2000). Since visible variations occur, the bulk rock geochemistry will be discussed according to the age of the rocks, rather than the volcanic facies. ...