 | | Journal (article/letter/editorial) | | depositsof Madhya Pradesh-Maharashtrabelt, India, Otjosondu, S.W. Africa and Mount Brandnuten,S. Norway are...garnet(ao-- 11.67A, n -- 1.809---+ 0.006), diopside, bustamite, quartz,apatiteand microcline. The garnet, as...MANGANESE FORMATION OF OTJOSONDU, S.W. AFRICA The manganese ore deposits of Otjosondu,S.W. Africa havebeenshown...Precambrian--Siberia, Sagan-Zaba(near Lake Baikal), Baikal region, Ukraine. Cambrian-•Qussinsk, W. Siberia,Kazakhstan(Cambrianto...hematite,magnetite,sericite,chlorite,rhodonite,bustamite, tephroite,tremolite,actinolite,tourmaline,biotite |  | B HN, B., OKRUSCH, M., WOERMANN, E., LEHNERT, K., HOERNES, S. (1995) Metamorphic Evolution of Neoproterozoic Manganese Formations and their Country Rocks at Otjosondu, Namibia. Journal of Petrology, 36 (2) 463-496 doi:10.1093/petrology/36.2.463 | Journal (article/letter/editorial) | | depending on their paragenesis. They indicate very Namibia were subjected to high-^T-low-P metamorphism dur-...WORD& manganiferous sediments; Damara Orogeny; Namibia; formations. They are correlated with peak pressure...Manganese Formations and their Country Rocks at Otjosondu, Namibia JOURNAL OF PETROLOGY VOLUME :t(i NUMBER...and Miller (1983a) tentatively correlated the Otjosondu ores with the Chuos Formation, which bears glaciomarine...metallogenetic model (Buhn et al., 1992, 1993*). The Otjosondu Mn ore-bearing unit consists of at least two manganese |  | | Journal (article/letter/editorial) | | garnet-spinel skarn is the dominant skarn type. Garnet-bustamite skarn is restricted to the marble boundary. The...asssociated with sphalerite, both forming nodules in a bustamite matrix (Fig. 7f). The nodules are interpreted...rhodonite, Rs – rhodochrosite, Ch – chlorite, Bu – bustamite, Ja – jacobsite, Mm – Mn-magnetite, Ma – magnetite;...and very fine-grained magnetite in a matrix of bustamite. Magnetite is partly replaced by hematite (white)...paragenetically bound to different assemblages. At Otjosondu (Namibia) Mn3+jacobsites are associated with hematite |  | CABRAL, A. R., MOORE, J. M., MAPANI, B. S., KOUBOVA, M., SATTLER, C.- D. (2011) GEOCHEMICAL AND MINERALOGICAL CONSTRAINTS ON THE GENESIS OF THE OTJOSONDU FERROMANGANESE DEPOSIT, NAMIBIA: HYDROTHERMAL EXHALATIVE VERSUS HYDROGENETIC (INCLUDING SNOWBALL-EARTH) ORIGINS. South African Journal of Geology, 114 (1) 57-76 doi:10.2113/gssajg.114.1.57 | Journal (article/letter/editorial) | | CONSTRAINTS ON THE GENESIS OF THE OTJOSONDU FERROMANGANESE DEPOSIT, NAMIBIA: HYDROTHERMAL EXHALATIVE VERSUS...Department of Geology, University of Namibia, Private Bag 13301, Windhoek, Namibia e-mail: b.mapani@unam.na M...Africa ABSTRACT The stratigraphic position of the Otjosondu ferromanganese deposit in the Neoproterozoic Damara...the Swakop Group, as previously proposed. The Otjosondu ore comprises ferromanganese silicate-oxide assemblages...and manganese formations. The formation of the Otjosondu ferromanganese deposit is therefore unrelated |  | | Journal (issue) | | ........................pg. 3 Actinolite from Namibia by Justin Zzyzx .................................we bring you eleven articles about locations in Namibia that do not receive much publicity. It is easy...legendary deposits such as Tsumeb, the Brandberg region and the Erongo Mountains. Alpine clefts, huge soda...Mountains, located in the southwestern part of central Namibia. The Gamsberg Mountain is the most important landmark...Fluorapatite Fluorapatite is quite rare from the region but can be found as complex, colorless crystals |  | | Report (chapter) | | et al. 1989) Spain (Milland & Velilla 1994) Namibia (Bfihn et al. 1995) Sierra Nevada, California...hausmannite; Gt, garnet; Rdn, rhodonite; Bs, bustamite; Hdn, hedenbergite; Amph, amphibole; Br, braunite;...and IIA manganese silicate rocks from India and Namibia respectively. These authors have not attempted...clinopyroxenes from types IIIA and IIA rocks from India and Namibia respectively. Compositionally these are manganoan...compositions of coexisting rhodonite, pyroxmangite, bustamite, clinopyroxene and orthopyroxene define the miscibility |  | | Journal (article/letter/editorial) | | Ca–Mn–Al–Fe3þ quadrilateral. 1: Amphibolite-facies, Namibia (Vermaas, 1952; Dunn, 1979). 2: Amphibolite facies...clinopyroxene, hausmannite, apatite, Mn-rich calcite, bustamite, magnetite. 10. Eclogite facies, Praborna, W....Mn–Zn-spinel, quartz. 12. Amphibolite facies, Otjosondu, Namibia (B€uhn et al., 1995), with braunite, jacobsite...-bearing calderite-andradite garnets from Otjosondu, SWA=Namibia. Zeit Krist 189: 43–56 Andrut M, Wildner...manganese formations and their country rocks at Otjosondu, Namibia. J Petrol 36: 463–496 Cenki-Tok B, Ragu A |  | | Journal (article/letter/editorial) | | minerals include calcite, andradite, hendricksite, bustamite, aegirine-augite,franklinite and willemite with...the so-called celsianwith Cn 50 and Cn 55 from Otjosondu, South West Africa (Vermaas. 1953) and to a so-calledcelsianwith...by Larsen and Shannon (1922) as occurring with bustamite; it may have been anorthoclase.Small bodies of...M3LnnsnN, E. S. ,q,lrr E. V. Sn.a,wNoN(1922) Bustamite from Franklin Furnace, N J. Am. Minerotr.7,95 |  | | Journal (article/letter/editorial) | | ZONE. •1• •qUPRIYA ROF TABLE - 5 CONTINUED OTJOSONDU, S.W. AFRICA (ROPER, 1956) MANGANESE FORMATIONS...diagenetic' reconstitution,the unmetamorphosed man- Otjosondu,S.W. Africa [braunite-bixbyite-jacobsiteand garnet...meta-sedimentarymanganese (tephroite-rhodonite-bustamite-rhodochrosite) formation has been reconstitutedby...hausmannite-galaxite intergrowth)- andspessartite-rhodonite-bustamite-tephroite spessartite-rhodonite-tephroite-manganoan...Aravalli Group,GangpurGroup,andKhondaliteGroup), Otjosondu,S.W. Africa and Mount Brandnuten,S. Norway,are |  | | Journal (article/letter/editorial) | | stability of both minerals is constrained in the region of low f CO2 . The paper reports data on the Fe–Si–O...First, Fig. 1 shows two subparallel lines in the region of high oxygen fugacity corresponding to the reactions...reactions (1), (8), and (5) and encompasses the region of log f O2 values at which braunite is stable...diagram, below the reaction lines 7 and 6. This region of relatively low log f O2 values corresponds to...previous diagram (Fig. 1), it corresponds to the region in the vicinity of reaction line 4. Because of |  | | Journal (article/letter/editorial) | | sphalerite, galena, quartz, calcite Minor: feldspars, bustamite, manganoan wollastonite, apatite, gahnite, fluorite...2 lens Abundant: galena, sphalerite, calcite, bustamite, manganoan hedenbergite, rhodonite Minor: chalcopyrite...sillimanite, staurolite, chloritoid, sulphosalts, bustamite, pyrosmalite Downloaded by [University Of Pittsburgh]...calcite are abundant minerals and feldspars, bustamite, manganoan wollastonite, fluorapatite, gahnite...size northwards. Galena, sphalerite, calcite, bustamite, manganoan hedenbergite and ferroan rhodonite |  | | Book | | Mountainland The Central Northern to Northwest Region including Damaraland The Central Namib Desertand...Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and the Diamonds 44 49 241 254 272 275... Encyclopedia of the Mineralsof Namibia 443 Meteorites in Namibia Bibliography Index Photo credits...__ Republic of Namibia The President State House W°Ntdhoek FOREWORD Namibia is endowed with an...from near and far. Fine mineral specimen from Namibia are displayed in all the famous natural science |  | | Journal (article/letter/editorial) | | Neoproterozoic Mn-rich rocks of the Damara Belt in Namibia are associated with iron formation and supermature...hedenbergite, minor spessartine–grossular garnet and bustamite with accessory sphalerite, galena and chalcopyrite...outer shelf manganese and iron deposits at Otjosondu (Namibia) related to the Damaran orogenic opening...(in Czech) Houzar S, Sejkora J, Šrein V (2005) Bustamite from Pb–Zn skarn in Moldanubian marbles at Meziříčko |  | | Book (edition) | | Vshaped Gypsum Erythrine Topaz simple twins Bustamite lamellar Rhodonite yes Fluorite polysynthetic...Madenköy Mine, Çayeli, Rize Province, Black Sea Region, Turkey (sample: Halbach); XPL If marked in description... Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia (sample: Melcher/Oberthür); PPL D Fine-grained... Karabash, Chelyabinsk Oblast’, Southern Urals Region, Russia Au-Cu alloys, native Copper, native Gold...Potaro River, Kangaruma District, Potaro-Siparuni Region, Guyana Chalcopyrite, native Gold, Hematite, Millerite |  | | Journal (article/letter/editorial) | | gonditesconsistof quartz,spessartite, rhodonite(rarely bustamite),winchite,tirodite,manganophyllite, alurgite,piedmontite...24. Roper, H., 1956, The manganesedeposits of Otjosondu, S.W. Africa: 20th Int. Geol. Cong. Symp. on Manganese |  | | Book | | persons living in Franklin or in the surrounding region. These col¬ lections have since been dispersed...Pennsylvania, in the Minisink region, in the period 1640 to 1657. The Minisink region, extending along the Delaware...these and other iron-smelting operations in the region are given by Snell (1881), Haines (1888), Swank...1874, fol¬ lowing the coming of railroads into the region, and continued in inter¬ mittent operation until...science and technology, and a leading citizen of the region, twice elected to Congress, made the first serious | | | Book | | persons living in Franklin or in the surrounding region. These col lections have since been dispersed...Pennsylvania, in the M i n isink region, in the period 1 640 to 1657. The Minisink region, extendi ng along the...these and other iron-smelting operations in the region are given by Snell (188 1 ), Haines (1888), Swank...874, fol lowing the coming of railroads into the region, and continued in inter mittent operation until...science and technology, and a leading citizen of the region, twice elected to Congress, made the first serious |  | | Report (volume) | | mineralization in the PlioceneQuaternary Calatrava Region (central Spain) 29 43 81 91 105 117 123 139...hausmannite, huebnerite and/or Mn silicates (rhodonite, bustamite, tephroite), Mn carbonate and Mn sulphide (alabandite)...run off. The Late Proterozoic Damara Sequence, Namibia (Table 7) consists mainly of shelf facies sedimentary...in Breitkopf 1988) of the Damara Sequence at Otjosondu consists of (bottom to top) lower quartzite, lower...c. 750-650Ma Chuos Fm, Damara Sequence Otjosondu, Namibia Interglacial transgressiveregressive sequence; |  | | Book | | of the granite-gneissic Precambrian rocks of the region and of manganese mobilized by leaching of basalts...controlled by the structurally superimposed unwrapping region. This engendered the decisive conditions in the...granitized material itself. The wide country rock-region may in many cases be a significant contributor...the new mineral (metasome) or may diffuse into a region of increasing mobility, culminating in a solution...mineral parageneses of the Abu Dabbab area (Red Sea region, Egypt) showed that a lithophilic (crust) mineral |  | | Report (issue) | | no. 2, 8990 (1979). Analysis from Lake Baikal region, x-ray, infra-red data. ALUMINITE. Farkas and Werner...(not in abs.; from metamorphic rocks, Altai-Sayan region. AMPHlBULh. Lesnov et al., (Tr. Inst. Geol. Geofiz...395, 133-147 (1978). Analyses from Altai-Sayan region. BIUTITL. Kupriidnova et al., Uokl. AKad. Nauk...8, 76021 (1980). Analyses (not in abs.), Gissar region. BIOTITE. Mendoza Sanchez, Bol. Geol., Publ. Espec...Reversibility of lattice collapse in cation exchange. BUSTAMITE. Ashley, Econ. Geol. 75, 15-29 (1980). Microprobe |  | | Book (edition) | | an inner solid region of diameter 2440 km and density about 8 gcm3, and an outer region about 2260 km...alumina, alkalis and the rarer elements. If the region is quiescent and all the magma solidifies in the...if about half way through crystallization, the region becomes 8 Rocks and the Processes That Formed... More recently, it has been found that where a region is saturated with water, jadeite can form in veins... The Geological Sources of Gems In the Merelani region of Tanzania, veins containing tanzanite and tsavorite |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | Huantaya(*), Chanarcillo(*), and Chanca, Chile; Tsumeb, Namibia. BM DI:96, R:313, P&J:71, ABI:475. 1.1.1.3 Copper...Broken Hill mine, Zambia; Onganja mining district, Namibia. Andacolla, near Coquimbo, and Chuquicamata, Chile;...nm); weakly anisotropic. Bolshoi Anyui R.., Kolyma region, Russia, in gold-bearing alluvium. sm MZ 11(4):88(1989)...VHNjo9 = 260. R = 55.3 (540 nm). Magnetic. Kumak region, Southern Ural Mts., Russia, in quartz veins with...VHNjo9 = 900. R = 58.8 (540 nm). Magnetic. Kumak region, Southern Ural Mts., Russia, in quartz veins with |  | | Book (edition) | | abbreviated, e.g. canton (Switzerland), vilayet (Turkey), region (Chile), kray and oblast (Russia). The country...by Mobutu, and is now the Katanga administrative region again. The former Kivu province is now divided...United States or of the Upper Silesian historical region in Poland, where the importance of ore-bearing...Kunlun Mts., near Hotan, Xinjiang Uygur Autom. region, China, also at Fengtien, Taiwan. Green at Ospinskoye...Dara-i-Pioz In green needles to 7 mm at Tsumeb, Namibia. massif, Alai Mts.,Tajikistan. AM 62, 173, 1977 |  | | Book | | crystals are found in Germany and the St. Gotthard region of Switzer¬ land. Pyritohedra are found in the...sapphire; parti-coloured stones also found in this region. Good quality rubies and sapphires come from Cambodia...also with magnetite deposits in the Adiron¬ dack region of the same state. Ilmenite in the form of sand...found in the Altai Mountains, USSR; from the Eifel region of Germany; from Broken Hill, New South Wales and...deposits; with the hematite ores of the Lake Superior region and from Colorado; from Hants County, Nova Scotia |  | | Book (volume) | | from the Tertiary volcanic rocks of the San Juan region, Colorado. Amer. Min., vol. 21, p. 679. Layman...C02. Tephroite and rhodonite, associated with bustamite, are the main silicate constituents of the Treburland...1946); two assemblages are present, tephroite-bustamite-rhodonite and tephroitebustamite-manganocalcite...involving tephroite, bustamite and calcite: CaMnSi206 + Mn2Si04 + 2CaC03 bustamite tephroite calcite... Mag., vol. 75, p. 76. Tilley, C. E., 1946. Bustamite from Treburland manganese mine, Cornwall, and |
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