Mar 01, 2010nbsp018332The geology of the Komu area, southwestern Nigeria was investigated in order to determine the nature of occurrence, petrography and chemical composition, and to evaluate the mineral potential of granitic pegmatites. The pegmatites are hosted by paragneisses, amphibolites and granitic rocks. These host rocks are characterized by low pressure mineral assemblages of upper greenschist
Northwestern nigeria was carried out. this is aimed at determining the structural setting, ... medium grained biotite granite and pegmatites. different generations of pegmatites were mapped in the area and these are divided in to barren with repect to rare metal and mineralized types. the mineralized pegmatites are rich in beryl and they strike
The rare-metal pegmatites represent the youngest intrusions in this area and thus are likely to have formed in a separate magmatic episode, post-dating granite intrusion. the minna area of western nigeria lies within a pan-african orogenic belt that extends along the margin of the west african craton, from algeria southwards through nigeria ...
X-ray fluorescence base investigation of the gwon-gwon pegmatite field wamba, northcentral, nigeria. journal of geosciences and geomatics . 2017 5137-45. doi 10.12691jgg-5-1-4. correspondence to abdullahi a.m, applied geology department,
Pegmatites globally because of its attractive economic potentials. over the years in nigeria, the study of pegmatite has aroused interest. for example jacobson and webb 1946 studied the pegmatites of nigeria and highlighted that it is concentrated in a 400km ne-sw trending belt,
Pegmatite is a very coarse-grained igneous rock. simple pegmatites are composed of large crystals of ordinary minerals. here is a sample of alkali feldspar granite pegmatite from northern norway which is composed of alkali feldspar pink, quartz gray and biotite black. width of view 50 cm.
Department of geology, university of maiduguri, p.m.b 1069, borno state, nigeria corresponding author kamale, h.i abstract the geology of liji area is composed of members of the pan-african granitoids granite and pegmatite and the cretaceous sedimentary rocks of bima, yolde, pindiga and gombe sandstone formations.
Been reported in oban massif, southeastern nigeria33,34 and recently in the kushaka schist belt of northwestern nigeria7. within this belt, the individual pegmatite bodies generally trend in a n-s direction. the pegmatites are intrusive hosted by rocks such as migmatites, gneisses, schists and granites of the pan african
The pegmatites of new york have simple to complex, and variable, mineral assemblages table 1. the pegmatites from valhalla and new york city, as well as those from the adirondack lowlands, do not show mineralogical zoning. such zoning is a common feature of the bedford pegmatites and those in the southern and eastern adirondack highlands. post-
Pegmatites is that the wallrocks around these pegmatites are metasomatized i.e. metamorphosed via an in ux of pegmatite-derived components, and the dispersion of alkali rare elements in the metasomatic aureoles around pegmatites is used as an exploration tool. lithium anoma-lies de ne the widest halos adjacent to pegmatites, which
Nigeria granite tiles find out your desired nigeria granite tiles with high quality at low price many stone suppliers publishing nigeria granite tiles products ... schorl and lithiumrich tourmalines are usually found in granite and granite pegmatite magnesiumrich tourmalines dravites are generally restricted to schists and marble tourmaline is ...
Pegmatites in the harts range region, informally named the entia pegmatite field, appear to be analogous to the nyf-type pegmatite and associated granitic suite of cern253 1991. an unusual deposit that may be part of the granite-related mineral system is the mary kathleen deposit in northwest queensland, which was mined for u until the 1970s.
Pegmatite bodies around awo in southwestern nigeria were carried out with a view to characterising them and determining their genesis and rare metal potentials that may be related to ta-nb mineralization. economic potentials. fifteen 15 whole rock pegmatite samples and five 5 muscovite
Lying pegmatite veins intruding gneisses, schists and granitic rocks around igbeti area, southwestern nigeria. this is with a view to determine their compositional characteristics and rare metal ta-nb potential. a total of 24 samples comprising whole rock pegmatites and mineral ex-
Generally, the pegmatites in the janjala area favourably compared well with other relatively mineralized rare-metal pegmatites of the north central nigeria, such as wamba, nasarawa and keffi pegmatites. keywords pegmatite, geochemistry and mineralization, granite, petrography
Oligaclase albite and tourmaline -rich pegmatite in ijero-ekiti represent the apical parts of a concealed granitoid most likely older granite body. the field relationship shows that the pegmatite occurs as massive and tabular bodies as well as dykes and veins plates 1amp 2 . plate 1 photomicrograph of tabular pegmatite
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41 kinds of granite from nigeria, such as red river granite,kporoko african multicolour,gitata gold,guddi ivory granite,karu spotty granite.
The pegmatites contains more fluxes and liquidus depressing elements p, h2o, f especially phosphorus. the granitoids biotite muscovite granite, albite granite and granite aplite are therefore fertile, peraluminous, siliceous and s-type and are parental to the pegmatites.
Although pegmatites having gross compositions similar to other rock types are known, their composition is generally that of granite the composition may be simple or complex and may include rare minerals rich in such elements as lithium, boron, fluorine, niobium, tantalum, uranium, and rare earths.
Generalized geological map of nigeria oyawoye, 1972. which include granite, granodiorite, diorite charnockite, pegmatites and aplites. the ago-iwoye study area covers the northeastern part of the map of ijebu-ode sheet 280 ne. the rock types observed in this area include coarse porphyritic granite, biotite- granite-gneiss,
Pegmatites are the major source of gem-quality minerals throughout the world. they typically host perfectly clear topazes, tourmalines, beryls and are mined globally from brazil the minas gerais region, to ukraine volyn pegmatite field, near volodarsk-volynsk, russia alabanshka pegmatite district in the urals, us the sawtooth batholith, colorado san diego county, california, nigeria ...
Various studies have been carried out on pegmatites in nigeria by 5 6. 4 in the southwestern part of nigeria, pegmatites are hosted within varieties of rocks of metamorphic and igneous origin where they intrude the older litholo-gies discordantly 87 9 10 but there is paucity of information on pegma-tites in igangan sheet 240 nw.
In the past, the search for mineralized pegmatites in nigeria was concentrated within the ne-sw regions, within the so-called tin province or pegmatite belt of nigeria jacobson and webb, 1946. however, recent studies by ekwueme and matheis 1995, ero and ekwueme 2009, garba 2003, okunlola 2004, okunlola and king 2003,
Jun 13, 2018nbsp018332pegmatite is an extremely coarse-grained intrusive igneous rock composed of large interlocking crystals. there is no defined mineralogy for pegmatite any plutonic rock may form pegmatite. the most common type of pegmatite is made of granite. granite pegmatite typically contains feldspar, mica, and quartz.
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