 | | Journal (article/letter/editorial) | | OF KAFFO VALLEY ALBITE-RIEBECKITEGRANITE, LIRUEI GRANITE RING-COMPLEX, NORTHERN NIGERIA I.P. ORAJAKA Department...Anambra State University of Technology, Enugu (Nigeria) (Received November 20, 1985; accepted for publication...Kaffo Valley albite--riebeckite-granite, Liruei Granite ring-complex, northern Nigeria. Chem. Geol.,... 56 : 85--92. The Kaffo Valley albite--riebeckite-granite is a small alkaline intrusion covering an area...composed largely of albite and K-feldspar and subordinate aegirine. The Kaffo Valley albite--riebeckite-granite |  | | Journal (article/letter/editorial) | | two latest granite intrusives in the Rossesring complex, County Donegal, Ireland. The beryl occursin patchesof...haveformedat a late stagein the development of the ring complex. Guidedby this interpretation,the distributionand...Newer Caledonian (post-Dalradian, pre-Carboniferous) ring complexthat intrudesmigmatitic granodiorite in north-west...granite(G1), whichissucceeded by an intermediate ring oœcoarse-grained granite(G2), followed in turn by...granodiorite; G1-G4:granite typesin theRosses ring complex(nmscovite-rich G3 graniteshownstippled);B: beryl |  | | Book | | Distribution in Tin-bearing Pegmatites of Southwestern Nigeria. . . . . . . G. Matheis, W.O. Emofurieta and S...Department of Geology, University of Ife, Ile-Ife, Nigeria B.J. FRYER Department of Geology, Memorial University...Nigerian Steel Development Authority, Kaduna, Nigeria OHIWEREJ List of Contributors IX B. VAN DE...metallotects: (1) intracontinental hot spots (e.g. Jos Plateau) and consequent, but aborted, rifts (e.g. Sullivan...Hunter, D.L. (1976). 'Some Enigmas of the Bushveld Complex', Econ. Geo/., 71, 229-48. Hutchinson, R. W. (1979) |  | | Book (volume) | | allocated on a structural basis: vol. 1. Ortho- and Ring Silicates, vol. 2. Chain Silicates, vol. 3. Sheet...illustrate the six polymorphs as in Fig. 4. Many more complex cells are possible and the existence of some of...103 days, and muscovite is formed similarly on an albite with only 0-20 per cent. K2O. The hydrothermal... c C c C Corundum F Felspar Or K-felspar Ab Albite Ms Muscovite Pg Paragonite ss Solid solution Fig...pressure. The hydrous phases are projected on to the albite-potassium felspar-corundum plane (after Eugster |  | | Book (edition) | | Petrography Continental Basaltic Associations Plateau Basalts • Local Basalt Fields Chapter 4 4.1 Field...Overall. energy is conserved. but its flow is complex. Immediately before impact, the total energy is...chemical equilibrium. Many geologic systems are so complex (varying significantly in both space and time)...applied to systems in which flows of energy are complex and cause more than one state property to change...can be done. Water in an enclosed lake on a high plateau has lots of potential energy relative to sea level |
|
