Sadoros rhyolite and felsic
dykes are two other types of felsic
/acidic rocks granite family.
Following detailed geological mapping and geochemical and geophysical surveys a series of close-spaced northeast dominant mineralised structures and subsidiary semi-orthogonal structures that cut north-west trending felsic
dykes have been discovered.
The geophysical anomalies are interpreted as the contact between felsic
tuffs and intermediate volcanics and are located near a kilometric tonalite plug intruding the northern limb of the fold.
The results obtained by Geologie Quebec from systematic mapping coverage indicate the presence of a wide variety of biotite-, hornblende- and pyroxene-bearing plutonic rocks, ranging in composition from felsic
to ultramafic, and numerous, isolated belts of variably metamorphosed volcanic and sedimentary rocks (Fig.
The units sampled and best estimates for their ages are the Lobster Brook Formation (554 [+ or -] 6 Ma), Leavitts Head Formation (554 [+ or -] 3 Ma), Ragged Falls Suite (553 [+ or -] 2 Ma), Mosquito Lake Road Formation (514 [+ or -] 2 Ma, maximum age), Bayswater Formation (436 [+ or -] 3 Ma), Centreton Granite (437 [+ or -] 3 Ma), felsic
dyke of North Head, Grand Manan Island (396+3/-2 Ma), and Lake George Cupola, Lake George Mine (414 [+ or -] 2 Ma).
Geochemical exploration undertaken by the Jordanian Natural Resources Authority (NRA) and Bureau de Reserches et Geologique between 1992 and 1994 over the southern Jordanian basement identified enhanced gold concentrations over felsic
volcanic rocks of the Aheimir Suite in Wadi Araba.
The mineralized zones are associated with quartz-carbonate-pyrite alteration, and are hosted by felsic
On a regional scale, a series of mafic to felsic
volcanic flows and tuffs underlie the property, which also appears to be centered on the axis of a regional geophysical gravity high.
The largely overlooked potential of felsic
intrusions and associated Cu-porphyry environments as PGE hosts is demonstrated with examples from the Entwine Lake Complex and Cordilleran alkalic porphyry copper deposits.
The matrix of the Hurricane Mountain melange includes mafic volcanic, felsic
volcanic, metasedimentary and serpentinite blocks.
The gemstones are closely related to the contact between mafic schists and felsic
gneisses and pegmatites.
prospect, hole KW06-01 was drilled vertically to 880 feet and encountered sheared and veined intermediate volcaniclastic andesite country rock and interbedded felsic
rhyolite to rhyodacite units.