wacke


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Related to wacke: Arenite, lithic sandstone

wacke

[′wak·ə]
(petrology)
Sandstone composed of a mixture of angular and unsorted or poorly sorted fragments of minerals and rocks and an abundant matrix of clay and fine silt.
References in periodicals archive ?
The Logans Mountain showing is similar to the Jimmy Hill occurrence in that the mineralization is hosted in east south-east trending quartz greissen veins cutting hornfelsic wacke.
Wacke correctly characterizes the underlying issue as one of the acceptability of hard-bargaining behavior.
The ore consists of unsorted, matrix-supported, re-sedimented, polylithic breccia-conglomerate that occurs within channel-fill sequences comprising felsic pyroclastics, barren polylithic breccias and finegrained volcaniclastic rocks and wackes (Fig.
Furthermore, hole ELE-05-142 also intersected near the surface a zone of biotite-actinolite wacke with disseminated arsenopyrite and 5-10% of quartz veinlets, which zone returned 2.
The dominantly mafic volcanic rocks of the Long Pond Bay Formation are separated from the dominantly felsic to intermediate volcanic rocks of the Ingalls Head Formation to the northeast by a sequence of thick-bedded wacke that may represent a facies of the Flagg Cove Formation.
Furthermore, trench TR-63, located between TR-20 and TR-52 (surface plan), has outlined disseminated arsenopyrite mineralization (1%) within a diorite dyke and its enclosing altered wacke.
The composition of the metasandstone is dominantly feldspathic wacke with subordinate quartz- and lithic wacke and rare feldspathic arenite (White 2010).
From the compiled data, they constructed variograms taking into account grades and thicknesses, 1:2500 isopachs for wacke thicknesses and top of wacke to basement distances, a 1:10,000 structural map of the basement unconformity, cross sections for the projects division group, and statistical analyses.
1997) plot as shale and wacke with a few samples scattering in the Fe-sandstone field (Herron 1988).
Mineralization consists of finely disseminated sulphides (arsenopyrite-pyrrhotite), associated with quartz- tourmaline-actinolite veins and veinlets in a very altered wacke.
The Mosquito Lake Road Formation consists of a heterogeneous, interbedded sequence containing rhyolitic crystal tufts and flows, felsic pyroclastic breccia, laminated phyllitic siltstone and sandstone, quartz-rich feldspathic wacke, volcanic lithic wacke, conglomerate and minor mafic volcanic rocks (Johnson 1994;Johnson and McLeod 1996,Johnson 2001b).