Hornblende-feldspar porphyries, displaying flow or trachytic
textures, occur as the extrusive equivalent of the intrusive dikes.
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.
Many samples preserve relict igneous or sedimentary textures, such as intergranular and trachytic
textures in mafic flows, eutaxitic banding in felsic flows, ffagmental texture in tuffaceous rocks, and bedding in epiclastic rocks.
loose, fragmental) know as local trachytic
basalt-andesite with an estimated age of 20000-30000 years BP (Asio 1996; Jahn and Asio 1998).
The Bear Lodge alkaline-igneous rocks, which are dominated by phonolitic and trachytic
sills, dikes, and plugs (as well as numerous related late-stage intrusions and intrusive breccia bodies), could represent the upper levels of an alkaline-igneous system similar to that exposed at Cripple Creek.
The same applies to the trachytic
tuff core from Karlich Ba, recovered outside stratigraphical context (Vollbrecht 1992).
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.
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