quartz porphyry

quartz porphyry

[′kwȯrts ′pȯr·fə·rē]
(petrology)
A porphyritic extrusive or hypabyssal rock containing quartz and alkali feldspar phenocrysts embedded in a microcrystalline or cryptocrystalline matrix. Also known as granite porphyry.
References in periodicals archive ?
The different zones are strong propylite, argillic, sericitic and potassic (biotite) alteration hosted in a biotite, feldspar quartz porphyry.
Recent analyses by IGMI's Consulting Geologist, Dan Robertson determined that the mineralization represents a skarn zone between sediments and quartz porphyry.
Gold mineralization occurs in quartz tourmaline ankerite veins located at the contact of ultramafic and mafic rocks as well as quartz porphyry intrusive hosted mineralization.
Intruding this is quartz porphyry dikes and sills which has a coarsely crystalline phase and a finer grained phase occurring in the margin of the intrusions perhaps as "chill margin" phenomena.
A quartz porphyry felsic intrusive with adjacent felsic rock form are believed to be part of an eastern extension of this MMI trend
Commenting on the results, Conquest's President & CEO, Terence McKillen, noted: " The target mineralization, as indicated by the three discrete boulder trains comprising over 265 boulders found on the south shore of King Bay, is high grade gold contained in blue-black quartz veins in a hydrothermally altered quartz porphyry together with pyrrhotite.
The trench exposed a sericite altered Feldspar Quartz Porphyry and the Hangwall contact to the Quartz Breccia Vein.
The key features are quartz porphyry intrusion host rock with phyllic alteration, now a quartz-sericite schist, containing deformed quartz-sulfide veins and veinlets, plus an association of Au, Cu and Mo.
The 3rd phase of exploration will focus on two additional targets: (1) attempt to intercept a second quartz porphyry dyke crossing the property in an east-west direction some 150 metres to the north of the main dyke and (2) the putting down of a 900' to 1300' hole in order to intersect possible Balmer Sequence of Rocks, that are host to the orebodies at both the Campbell and the Red Lake mine.
This mine was developed on a large ridge underlain by outcropping sheared and altered quartz porphyry diorite, containing pervasive quartz veining and pyrite-chalcopyrite disseminations.
Gold and silver mineralization appears to be localized along high-angle structures within a complex series of quartz porphyry and distinctive intrusive breccia dykes that trend east-west through the Outcrop breccia.