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quartz-feldspar
A mechanism is proposed to explain the genesis of biotite-quartz-feldspar plagiomigmatite leucosomes as a consequence of the reaction of an amphibolite protolith with ascending fluid.
      
Regular quartz-feldspar (graphic) and two-feldspar intergrowths are typical of granitic pegmatites.
      
In the course of evolution of the Kronotsky island arc, all these elements were overlapped by tephrogenic turbidites (Pikezh Formation) and quartz-feldspar graywackes (Pikezh Sandstone) that were involved in the accretionary prism as well.
      
In the Eocene, a considerable amount of quartz-feldspar sediments enriched in radiogenic Nd was consumed in the subduction zone, which resulted in a strong contamination of magmas derived from the garnet lherzolites of the mantle wedge.
      
The Pancarli Ni-Cu mineralization is located in the metamorphic sequence of the Bitlis massif consisting of biotite gneiss, quartz-feldspar gneiss, amphibolite, and metagranitic rocks.
      
The host rock in the immediate vicinity of the orebodies is generally quartz-feldspar gneiss or more rarely quartz-feldspar gneiss and amphibolite.
      
Although other sources cannot be entirely ruled out, the lead isotope composition of most of the galenas and of local quartz-feldspar porphyries suggests that most of the lead in the vein-galenas was derived from the Dome mine porphyries.
      
The mineralization is situated within the J?rn granitoid complex and is associated with intrusive quartz-feldspar porphyries.
      
Mineralization consists of disseminated chalcopyrite and gold in a topaz bearing quartz-sillimanite gneiss hosted by quartz-feldspar and quartz-mica gneisses.
      
Based on evidence from field relationships, alteration studies and petrographic observations, the quartz-feldspar porphyry dikes intruded after the formation of ironstones, but prior to Au-Cu-Bi mineralization.
      
(1990), but inconsistent with the interpretation by McPhie (1993) that quartz-feldspar porphyry sills at the Peko smelter site intruded into wet sediments.
      
Two or more periods of quartz-feldspar porphyry intrusion occurred in the Tennant Creek district.
      
Gold-bearing veins are hosted by the Paleoproterozoic Barama-Mazaruni Supergroup, a greenstone belt sequence consisting of mafic volcanic rocks interbedded with sedimentary rocks that are intruded by quartz-feldspar porphyry and rhyolite dikes.
      
The Jupiter gold deposit in the northeastern Eastern Goldfields Province of the Yilgarn Craton of Western Australia is hosted in greenschist facies metamorphosed tholeiitic basalt, quartz-alkali-feldspar syenite, and quartz-feldspar porphyry.
      
Syenite intrudes basalt as irregularly shaped dykes which radiate from a larger stock, whereas at least three E-W and NE-SW striking quartz-feldspar porphyries intrude both syenite and basalt.
      
Much of the sulphide is associated with intergranular plagioclase, or quartz-feldspar symplectites, along the margins of rounded cumulus orthopyroxenes.
      
Oceanic specimens have a compositional spread ranging from trachytic to the quartz-feldspar cotectic zone, consistent with derivation through a trachyte magma stem.
      
Continental comendites show a strong correlation with the experimentally determined quartz-feldspar minima along a path of increasing peralkalinity.
      
Plagioclase in the range An2-An10 in a relatively undeformed Quartz-feldspar pegmatite is compared with similar material in a strongly deformed and recrystallized shear zone.
      
Idiomorphic crystals of roedderite occur in melt-coated cavities of xenoliths of contact-altered quartz-sillimanite and quartz-feldspar gneisses which were ejected with the tephritic lava of the Bellerberg volcano.
      
 

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