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| ISOTOPE DATA TO THE PETROGENESIS OF THE MARANGUDZI RING COMPLEX, RHODESIA K.A. FOLAND Department of Geology...1975 The Marangudzi ring complex, Rhodesia, consists essentially ofa gabbro mass intruded by ring dykes...short time span. 1. Introduction The Marangudzi igneous complex is located in southeast Rhodesia, approximately...approximately 80 km east of Beitbridge. The complex, emplaced into the roughly 2.7 b.y. old granitic basement...the Limpopo orogenic belt [1], is one of several ring complexes occurring in the Nuanetsi igneous province |
 | Riishuus, M. S., Peate, D. W., Tegner, C., Wilson, J. R., Brooks, C. K. (2008) Petrogenesis of Cogenetic Silica-Oversaturated and -Undersaturated Syenites by Periodic Recharge in a Crustally Contaminated Magma Chamber: the Kangerlussuaq Intrusion, East Greenland. Journal of Petrology, 49 (3) 493-522 doi:10.1093/petrology/egm090 | Journal (article/letter/editorial) |
| nordmarkite (quartz syenite) at the margin, through pulaskite, to foyaite (nepheline syenite) in the centre;...volumetrically dominated by the Kangerlussuaq Alkaline Complex, which includes the KI (Wager, 1965; Kempe & Deer...Beckinsale et al. (1970) dated a transitional pulaskite by the K^Ar method to 504 12 Ma. Pankhurst...ages. Tegner et al. (2008) dated biotite from a pulaskite to 508 11Ma using 40Ar^39Ar. The Kangerlussuaq...world. To the authors’ knowledge the Brandberg Complex (Schmitt et al., 2000), and Khibina and Lovozero |
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| eline intergrowths in a syenite from the Marangudzi complex, Rhodesia C. M. B. HENDERSON and F. G. F...SUMMARY. Nepheline in a basic syenite from the Marangudzi complex is relatively Ca-rich with CaO from I'9 to... THE nepheline-bearing rocks from the Marangudzi Ring Complex, Rhodesia, form a differentiated series...series varying from nepheline monzonite to pulaskite and foyaite. In this series the modal alkali feldspar...intergrowths described in this paper. Textures. One pulaskite sample (R. 26) is described as it shows the nephelineplagioclase |
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| five from the nepheline-bearing rocks in the Marangudzi complex of Southern Rhodesia have been analysed chemically...hastingsites from rocks occurring in the Marangudzi Ring Complex of Southern Rhodesia have also been made...PB 38 Mbul hornblende-fayalite granite. Kaleri Complex, Jos Plateau, Nigeria. A.17. Hastingsite from R...R. 17. R.18. PB 48 Syenite from Pankshin Complex. Jos Plateau, Nigeria. A.18. Hastingsite from R.18....21. PB.47 Hornblende-fayalite granite. Pankshin Complex, Jos Plateau, Nigeria. A.21. Hastingsite from R |
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| Japan-Ryukyu Izu-Bonin-Marianas Philippines-Sulawesi South-west Pacific New Zealand Sumatra-Java Southern Italy...sea-level is Macquarie Island, situated 1100 kilometres south-west of New Zea¬ land. In the northern part of the...section through the Macquarie Island ophiolite complex (after Griffin and Varne 1980). VOLCANIC SEQUENCE...Sediments SHEETED DYKE COMPLEX MASSIVE GAB BROS LAYERED GABBR0 COMPLEX X~ X X—X~X~X— x— x — X...present-day volcanism is concentrated in a north¬ east-south-west belt through the middle of Iceland, lying parallel |
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| AIr ring complexes and the chapter devoted to the Cameroon line. A detailed review of African ring complexes...discrimination between tholeiitic, transitional and alkaline ring complexes. Based on the available data (including...so-called alkaline intrusions which occur in African ring complexes are associated with tholeiitic or transitional...geochemical criteria discriminating the anorogenic ring complexes (including A - granites s.s.) from the...review our present knowledge of the main African ring complexes and emphasize the need for a new classification |
