 | | Journal (article/letter/editorial) | | principally of potassium feldspar (sanidine-anorthoclase, partly microperthitic) in thick tablets 3 to...and to this should be added the granites round Uweinat (Burollet, 1963) and the younger members of the...y. (Jacobson et al., 1963). At Jebel Uweinat, on the borders of Libya, Egypt and Sudan, Burollet (1963)...of the Kufra basin. Compagnie des Petroles Total (Libye). Saharan Symposium, Tripoli {Libya), 1963. |  | Franz, Gerhard, Steiner, Gesine, Volker, Frank, Pudlo, Dieter, Hammerschmidt, Konrad (1999) Plume related alkaline magmatism in central Africa—the Meidob Hills (W Sudan) Chemical Geology, 157 (1) 27-47 doi:10.1016/s0009-2541(98)00195-8 | Journal (article/letter/editorial) | | magnetite, and in a late stage by plagioclase–anorthoclase and apatite. Significant contamination by crustal...Hills. The oldest volcanic rocks Ž36 Ma. come from Jebel Kussa, a small occurrence near the centre of the...olivine q clinopyroxene, then plagioclase and anorthoclase. The high Ba, low Sr concentrations in the trachytic...clinopyroxene, spinel-magnetite, plagioclase–anorthoclase and 38 G. Franz et al.r Chemical Geology...to a change in feldspar composition towards anorthoclase. The ZrrNb ratio ŽFig. 5. for the lavas of the |  | | Book | | Democratic Republic of the Congo Ethiopia Guinea Libya Malagasy Republic Mali Republic Morocco iti Contents...the high-temperature Or-Ab series are called anorthoclase (triclinic). At lower temperatures and under...be expressed as follows: Na-rich nepheline + anorthoclase—— > Na,K nepheline + albite + microcline (volcanic...plateau region, the Kasungu area, and the Ncheu district. Four miles to the north-west of the town of Rumpi...hundred miles north of Mount Elgon in the Karamoja district of Northern Province, have not been fully examined |  | | Journal (article/letter/editorial) | | best outcrops of these rocks in Egypt are found at Jebel Meatiq (26°07'N, 33°43'E) in the Eastern Desert...toward the Precambrian outcrops at Jebel Uweinat at the Egypt--Sudan--Libya junction. Here ages up to 2670...al., 1980), which reach at their type locality, Jebel Dokhan, a thickness of 1200 m. Stern (1979a) obtained... , ) Fig. 5. The Hamad Abadu unconformity at Jebel Katharina (southern Sinai). 40 (Fig. 5) in Sinai...has been suggested (Agron and Bentor, 1981) after Jebel Katharina, the highest m o u n t a i n in Sinai |  | | Book | | chronology: Nubia (650 Ma), Iforas (560- 540 Ma), Uweinat (490), AIr (490-400 Ma), BaIche-Mangbai (425-384...(Cret.-Mioc.), Los (96 Ma), Red Sea Hills (90 Ma), Uweinat (60 Ma), Cameroon Line (60- 30 Ma and 30 Ma-Present)...292) Prior GT (1900) On aegirine and riebeckite anorthoclase rocks related to the "grorudite-tinguaite" series...if' Cope Verde Ahaggar ()-o ~ Tibesti cY Jebel Mora Tristan do Cunha Fig. 4. Africa-hot spot...Foids Ti-magnetite Apatite Oligoclase-andesine-anorthoclase (15 - 50/65 - 45/3 - 20) Labradorite (55 - |
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