 | | Journal (article/letter/editorial) | | geochemistry of massif-type anorthosites from southwest Madagascar Received: 19 December 1997 / Accepted: 12 June...June 1998 Abstract Four massif-type anorthosite bodies 25± 100 km2 in area occur within high-pressure...supracrustal gneisses in southwestern Madagascar. Two of these bodies (Ankafotia and Saririaky) appear to have...charnockites) are conspicuously absent. The anorthosite bodies are dominated by coarse grained anorthosites...d'Antananarivo, B.P. 906, Ankatso, Antananarivo 101, Madagascar Present address: 1 Randgold & Exploration, Sanmatenga |  | | Journal (article/letter/editorial) | | ZSSN: 1342-937X Gondwana Research Geology of Madagascar: A Brief Outline Lewis D. Ashwall and Robert...Febriinry 27, 1999) Introduction The island of Madagascar covers an area of -627,000 km', about tlie size...oil and gas, both on-and off-shore in western Madagascar, is being renewed. Precambrian rocks, intruded...two-thirds of Madagascar. The presence of Archaean rocks, long suspcctcd in Madagascar, has recentIy...two-thirds of the island. The geological map of Madagascar given in Figure 1 represents a highly simplified |  | | Journal (article/letter/editorial) | | late Precambrian deformation history in southern Madagascar Jean-Emmanuel Martelat a,b,*, Jean-Marc Lardeaux...Uni6ersité d’Antananari6o, BP 906, Antananari6o, 101, Madagascar Received 29 December 1998; accepted 5 October...Precambrian times, with an example from southern Madagascar. The finite strain pattern is derived from the...high temperatures were ubiquitous in southern Madagascar. By contrast, regional pressure differences were...general discussion]. The Precambrian belt of Madagascar represents a more-or-less continuous section |  | | Journal (article/letter/editorial) | | metamorphic age of metasedimentary rocks from southern Madagascar Alan S. Collins a,b,⁎, Peter D. Kinny c, Théodore...de la Terre, Université de Toliara, Toliara, Madagascar b c a r t i c l e i n f o Article history:...Metamorphism East African Orogeny Madagascar Gondwana a b s t r a c t Southern Madagascar is the core of a N 1 million...southern East African Orogen of eastern Africa, Madagascar, southern India and Sri Lanka. Here the Vohibory...early East African Orogeny affecting the west of Madagascar along with its type area in East Africa, whereas |  | | Journal (article/letter/editorial) | | 1 kbar) massif-type anorthosite from the Ankafotia body of southwest Madagascar. The sample studied is...Four small (25–100 km2) massif-type anorthosite bodies (Ankafotia, Saririaky, Volovolo, and Manambahy)...granulite facies ductile shear zones in southwestern Madagascar (Boulanger, 1959; Morel, 1996; Ashwal et al....that magmatic emplacement of the Ankafotia and Saririaky anorthosite bodies took place at 660 ⫾ 60 Ma... samples over a large region in southwestern Madagascar, de Wit et al. (1998, 1999) proposed that early |  | Boger, S.D., Hirdes, W., Ferreira, C.A.M., Jenett, T., Dallwig, R., Fanning, C.M. (2015) The 580–520Ma Gondwana suture of Madagascar and its continuation into Antarctica and Africa. Gondwana Research, 28 (3) 1048-1060 doi:10.1016/j.gr.2014.08.017 | Journal (article/letter/editorial) | | The 580–520 Ma Gondwana suture of Madagascar and its continuation into Antarctica and Africa...Fanning, C.M., The 580–520 Ma Gondwana suture of Madagascar and its continuation into Antarctica and Africa...MANUSCRIPT The 580–520 Ma Gondwana suture of Madagascar and its PT continuation into Antarctica and...ABSTRACT SC RI U–Pb age data from southwest Madagascar provides a compelling case that the pre-Gondwana...continuity across the suture. In southwest CE Madagascar the distribution of metamorphic ages places the |  | | Journal (article/letter/editorial) | | early 1990s, my colleagues and I were working in Madagascar, and we recognized the need to appreciate the...coeval with and equivalent to the one present in Madagascar. By using similar types of approaches, we tracked...plume at 182 Ma, Gondwana fragmentation began as Madagascar + India + Antarctica separated from Africa, and...and drifted southward. Only after 90 Ma, when Madagascar was blanketed by lavas of the Marion plume, did...Permian – Eocene sedimentary basins of western Madagascar: transtensional pull-apart structures are dextral |  | | Journal (article/letter/editorial) | | ferrodiorites at the immediate contacts of three anorthosite complexes (Chilka Lake, Bolangir and Turkel)...provide reliable constraints on the time of anorthosite emplacement. Zircons from three ferrodiorite...calc silicate rocks of the border zone of the anorthosite. Zircon grains in the Chilka Lake ferrodiorite...disprove the often quoted Mesoproterozoic age of anorthosite emplacement in the EGB, which was based on a...Rb–Sr whole rock ‘isochron’ for the Chilka Lake anorthosite complex (1404 9 89 Ma; Sarkar et al., 1981). |  | | Journal (article/letter/editorial) | | differentiation at the base of the thickened orogen, anorthosite diapirism and pervasive thermal overprinting...1974, 1976). In the northern hemisphere the anorthosite belt begins in Europe in Finland / Ukraine, continues...and the United States. The southern hemisphere anorthosite belt begins in the west at Capivarita, Brazil...Brazil, extends eastwards to Angola, Tanzania, Madagascar, Queen Maud Land in Antarctica, the Eastern Ghats...Donaldson et al. (1973) and confirmed (a) the anorthosite belt on the elongate ledge-like Proterozoic supercontinent |  | | Journal (article/letter/editorial) | | "ff,'itb 1 table Zusammenfassung Plutone, die Anorthosite als Haupt- oder Nebenbestandteile enthalten,...Gesteine vorkommen. Es gibt ,,Orogen-plutonische Anorthosite", die zeitlich und rtiumlieh an Orogenesen gebunden...plutonischen Gesteinen geh5ren; anderseits gibt es ,,Anorthosite, die durch Sehwerkraft geb~indert sind" und die...ne ] massif, einige Minder zwischengelagert Anorthosite J" magmatische Texturen in Pyroxengranuliten...Abstract A comparison of plutons containing anorthosite as a major or minor constituent, in North America |  | | Journal (article/letter/editorial) | | Model for the Origin of Sulfide Deposits in Anorthosite-Associated Intrusive Complexes JUDITH L. HANNAH†...in only a handful of Proterozoic massif-type anorthosite complexes. Yet exploration interest has expanded...sulfides in this environment. Sulfide minerals in anorthosite complexes are generated when the silicate magma...concentrations will be spatially confined in large anorthosite complexes, with sulfide exposure dependent entirely...commonly characterize the country rocks of major anorthosite-associated intrusive complexes. Nevertheless |  | | Book | | references and index.ISBN-13: 978-3-642-77442-3 1. Anorthosite. I. Title. II. Series. QE462.A55A84 1993 552'...be expressed in terms of a comparison between anorthosite and basalt. A first-order understanding of basalt...there is little agreement about the origin of anorthosite. There are good reasons for studying and writing...the surfaces of the other terrestrial planets. Anorthosite is not a common rock on Earth, except in a few...Mercury as well. I would argue, therefore, that anorthosite is as worthy of study as basalt, if not more |  | | Book | | WITWATERSRAND TRIAD 73 H. C. M. Whiteside THe ANORTHOSITE OF SOUTHERN ANGOLA: A REVIEW OF PRESENT DaTA...and structure of the Moine Schists in the Morar district, western Inverness-shire. Abstract. Proc. geol...the sedimentary-volcanic sequences in the Kenema district of Sierra Leone reach the amphibolite and granulite...Angola Angola - Kasai Craton Tanzania woh —-ny Anorthosite Craton Rhodesia-Transvaal Craton Namaqua-—...Equally significant was the emplacement of the anorthosite body of southern Angola and northern South-West |  | | Book (volume) | | Bancroft areas in Ontario, or in the Coimbatore district of Madras. Although originally believed to be...p. 264. Eckermann, H. von, 1948. The alkaline district of Alno Island. Undersok., Ser. Ca., No. 36. Eppler...Roccati. . Ferrian ilmenite, anorthosite-norite, Ankafotia, Madagascar (Boulanger, 1957). 3. Ilmenite...Boulanger, J., 1957. Les anorthosites de Madagascar. Serv. Oeol. Madagascar, Trav. Bur. Geol., No. 79. Bowie...Black tantalian rutile (struverite), Kuala Kangsar district, Perak, Malaya (Crook & Johnstone, 1912). Anal |
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