... is the fundamental petrogenetic process that controls the evolution of both groups of granites. The tin-bearing alkali-feldspar aplogranites of the western group display an extreme degree of differentiation that has no petrological equivalent in the eastern group. These aplogranites are the product of a combination...

...M. Casimir; Frederick A. Henson Abstract The medium-grained porphyritic granite of the Dicq Rock on Jersey in the Channel Islands, and the aplogranites and dolerite intruding it, are described petrographically and their age relationships unravelled. GeoRef, Copyright 2004, American Geological...

... in the form of successive thin sheets or sills. Then followed the intrusion of the gabbros, possibly in the form of a laccolith. This was followed by the injection of the aplogranite magma and the production of its associated hybrids. Late-stage activity on the part of this magma may have caused...

... . geol. QUATERN TER 0 L Velasco Alkaline Province m . . . Quartz-rich veins Coarse Pulaskite Fine Pulaskite Volcanic blocks in Pulasklte matrix m Nordmarkite Quartz syenite Monzonite Riebeckite - Aegirine Granita Hornblende - Biotite Granite Aplogranite Gneiss blocks in Aplogranite Volcanics matrix...

... * ferrohastingsite is the main amphibole; also includes common hornblende. t ferrohastingsite rare. 3. A biotite aplogranite of Romapahari-Baharagora region, with strong potash enrichment, occurs as minor injections within the porphyroblastic gneissose granites (Table n, col. 4). Clear cross-cutting relationships...

... plutonic units of Sardinia batholith show mainly granodioritic and granitic composition and are broadly crosscut by late-satellite stocks mainly of fine-grained granites, as well as by a dike swarm of basaltic and aplogranitic rocks. The Fizza Ona outcrop, located near the small town of Padru west of Olbia...

...). This structure is offset by a late, south inclined, extensional fault of several tens of metres of offset. (2) Rapakivi‐related, aplogranite and pegmatite sheets are very common along and near this contact. These can be seen to cross cut SE‐down extensional shears and crenulations and also be deflected...

... = 0.70293) and aplogranites at 1003 f 18 ("Sr/?3r = 0.70360). K-Ar mineral dates (Clarkson & Brook 1977) are essentially concordant with the aplogranite age, indicating that no 1 2 B . C . S T O R E Y ET A L . L Fig. 1. A sketch map of the crustal blocks of West Antarctica illustrating the location of rocks...

...-unit builders [b(i such as the Santa Rosa, lie the younger ring complex super-units. They are of importance in the present context in that they often show strong vertical zonations. Thus, Puscao varies from granodiorite to granite (over 700 m) with massive drusy aplogranite sheets in flat sag-like...

...–feldspar veinlets in fine-crystalline aplogranite are usually overprinted by hydrothermal (W, Sn, Mo and Bi)-bearing mineralisation also related to the granite intrusion (Karwowski et al. , 1973 ; Kozłowski et al. , 1975 ; Olszyński et al. , 1976 ; Pieczka and Gołębiowska, 2012 ). Silesiaite...

... prospect is characterized by a suite of intrusive rocks similar to those at San Carlos. An equigranular monzogranite host rock, intruded by aplogranite, is cut by an early and two intermineral monzogranite porphyries. The three porphyries have grade signatures of 0.6 to 0.8, 0.3, and 0.15 percent hypogene...

... near the northwestern and southwestern margins of the pluton (figs. 2 , 3 B ). A suite of small intrusions of leucogranite and aplogranite forms an outer ring around the pluton. Granodiorite porphyry sheets occur as satellite intrusions in the country rocks. Granodioritic rocks are commonly...

.... Several of these granites come into the Russian aplogranite category, i.e. the ultimate product of the crystallization of late magmatic volatile solutions enriched in rare metals, or pneumatolytic-hydrothermal autometasomatic products of leucocratic biotite-granites. A tourmalinized hydrothermal intrusion...

...-(muscovite) granite (for details see Vennum & Storey 1987a). Plagioclase feldspar is An Some granites are porphyritic, with up to 40% of K-feldspar phenocrysts, which are often strongly perthitic. Others are fine-grained aplogranites, and veins and small bodies of aplite are common. Alteration and xenoliths...

... of lenses and nests up to several tens of centimetres across are relatively frequent within the coarsely-crystalline porphyritic to equigranular granite; smaller nests and mineralised quartz veinlets are frequent in finely crystalline aplogranite (Pieczka et al. , 2015 ). Here, the pegmatitic assemblage...

... in this sector are quartzite, hornblende biotite schist, as lensoidal metasedimentary enclave within MBG and Nolerite with numerous quartz veins. Three textural and mineralogical variants of granites are encountered in this area viz.-(a) augen gneiss: an aplogranite, porphyritic in nature composed of orthoclase...

... microgranite (G3) (Fig. 2A) . Both G1 and G2 have aplogranitic marginal facies (interpreted as roof facies), in which muscovite replaces much of the biotite. As described by Gindy (1953) , the pluton contains a weak, approximately east-west fabric (Fig. 2B) . The Trawenagh Bay Granite is in contact...

.... A later aplogranite or rnicrogranitc and spati:illy joined with thc typc Ilchari is also obscrvcd intruding ihe carlicr two Jour. Gcol. Soc. India, Vol. 42, Oct, 1993 EARLY PROTEROZOICARAVALLI METASEDIMENTS,RklASTi-IAN Tabie 11. Modal composifion of the Ahar River Granite Bi - 2.01 -2.19 - 1.51 Ms 2.21...

... and patchy TABLE I RESULTS OF GROUND CHECKING OF A FEW IMPOR'l'ANT AERIAL ANOMALIES RAJASTHAN (Field Seasons 1958-59) S. No. Locality 1. Saira Area District (Udaipur) Sheet No. 45H/NW Rock type Granite-Pegmatite aplite & aplogranites Order of activity 4-12 X bg 2. Singhara Area - do - 3. Kotra-Gandi Sarna...

... than the coexisting muscovite age of 54.5 Ma. A second muscovite separate (80-100 vs. 60-80 mesh) pre- pared from this specimen, yields a similar apparent age of 52.8 Ma. Sample CR12A was collected from a deformed and greisened aplogranitic vein cutting the metasediments a short distance to the NE...