This is no fault of the editor, Reinhold Smid, as many who have labored through the laconic and trachytic
style of Husserl's research manuscripts would happily confirm.
Other igneous rocks in the vicinity include the rhyolitic intrusions of Carrizo Peak (Pertl, 1984) and the Vera Cruz Mountains to the north of the dike swarm and the predominantly andesitic to trachytic
flows, breccias, and agglomerates of the Sierra Blanca volcanic sequence (Thompson, 1966) to the south and west.
The mineral occurrences are hosted by a highly mixed sequence of andesitic to locally trachytic
volcanics, volcaniclastic sediments, and minor limestone.
It is dominated by a granodiorite phase and is cross-cut by some later trachytic
, doleritic, and lamprophyre dikes.
However, some rocks display either vitreous or trachytic
Fyffe and Barr (1986) examined some of the felsic volcanic rocks in the vicinity of Cumberland Hill, including lava flows and tuffs in a rhyolitic unit and underlying trachytic
Originally described by Blum as synonymous with nepheline syenite, and later applied by Brogger to nepheline syenite with trachytic
The Zubrnice Fault could be important for the development of the CS Volcanic Centre, as the "mondhaldeite" body on this fault limits the crater vent filled with trachytic
breccia in the SW.
2000; Weisenberger & Spurgin, 2009) would suggest that Colombia has zeolite deposits; such similarities concern tectonic setting, type of volcanism and deposits and the occurrence of explosive rhyolitic and trachytic
volcanic rocks having alkaline to calcoalkaline affinity.
The rock has been variously [TABULAR DATA FOR TABLE 1 OMITTED] described as tinguaite (Clark, 1955; Hodgson, 1969), trachytic
phonolite (Hanes, 1962) and nepheline syenite (Currie, 1976; Globensky, 1985).
Modal composition is trachytic
(Table 1) while chemical composition of sample PPG-005 suggests high-K cal-alkaline rhyolites (Figure 7).
Slip and normal NW trending faults interact with inverse NE trending regional structures and possibly create the volcanic conduits for trachytic
to rhyolitic magmas of alkaline affinity (Cepeda & Pardo, 2004).