 | | Journal (article/letter/editorial) | | jmukwakwami@yahoo.co.uk Ā© 2004 Geological Society of South Africa ABSTRACT We report UāPb baddeleyite crystallization...intruding the Waterberg Group in Botswana and South Africa. These data increase the known extent of ~1...~1.9 Ga intraplate magmatism in southern Africa and place tighter age constraints on the Waterberg Group...Group than previously available. In South Africa, ~1.88 Ga dolerite intrudes upper Waterberg strata, constraining...uplifted sources in reactivated segments of the Limpopo Belt. The dolerites are typical continental tholeiites |  | Scoates, James S, Wall, Corey J, Friedman, Richard M, Weis, Dominique, Mathez, Edmond A, VanTongeren, Jill A (2021) Dating the Bushveld Complex: Timing of Crystallization, Duration of Magmatism, and Cooling of the Worldās Largest Layered Intrusion and Related Rocks. Journal of Petrology, 62 (2) doi:10.1093/petrology/egaa107 | Journal (article/letter/editorial) | | roof, and a carbonatite from the nearby alkaline Phalaborwa Complex. The results indicate that (1) the Bushveld...Zone through 500 C by 2053 Ma. The c. 2060 Ma Phalaborwa Complex (pyroxenite, syenite, carbonatite Ć¾ ...Paleoproterozoic Bushveld Complex in the Kaapvaal craton of South Africa includes an immense layered intrusion characterized...granitic rocks, and a carbonatite from the nearby Phalaborwa Complex. The results, coupled with the trace...(TML) are indicated (Good & de Wit, 1997). P, Phalaborwa complex; U, Uitkomst intrusion. (b) Simplified |  | | Journal (article/letter/editorial) | | number of igneous units across much of southern Africa suggests that the Umkondo dolerites were intruded...and the eastern part of the Limpopo Belt (Stocklmayer, 1981). In the south, the Umkondo Group is overlain...DL. Jones, work in progress, 2001). The Umkondo SOUTH AFRICAN JOURNAL OF GEOLOGY, 2001,VOLUME 104, PAGE...ophitic dolerite, consisting dominantly of augite Ā±pigeonite and calcic plagioclase (50% and locally glorneroporphyritic)...biotite separates. Hanson et al. (1998) obtained SOUTH AFRICAN JOURNAL OF GEOLOGY M.T.D. WINGATE 15 |  | ZHANG, Ai-Cheng, HSU, Wei-Biao, FLOSS, Christine, LI, Xian-Hua, LI, Qiu-Li, LIU, Yang, TAYLOR, Lawrence A. (2010) Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results. Meteoritics & Planetary Science, 45 (12) 1929-1947 doi:10.1111/j.1945-5100.2010.01131.x | Journal (article/letter/editorial) | | 01131.x Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results...revision accepted 28 August 2010) AbstractāNorthwest Africa (NWA) 2977 is an olivine-gabbro lunar meteorite...hot-desert collections (e.g., Oman and Northwest Africa; Korotev 2005; Korotev et al. 2009). These objects...ā 03632 ā 04841, Miller Range 05035, Northwest Africa [NWA] 032 ā 479, NWA 4734, NWA 4898, and Yamato-793169)...(>90%) of unbrecciated basalt (Dhofar 287, Northeast Africa [NEA] 003, and NWA 773 clan). Among them, the NWA |  | Huthmann, F.M., Yudovskaya, M.A., Frei, D., Kinnaird, J.A. (2016) Geochronological evidence for an extension of the Northern Lobe of the Bushveld Complex, Limpopo Province, South Africa. Precambrian Research, 280. 61-75 doi:10.1016/j.precamres.2016.04.010 | Journal (article/letter/editorial) | | Northern Lobe of the Bushveld Complex, Limpopo Province, South Africa F.M. Huthmann a,ā, M.A. Yudovskaya...Johannesburg, South Africa Department of Earth Sciences, Stellenbosch University, South Africa and Department...Earth Sciences, University of the Western Cape, South Africa c IGEM, Moscow, Russia b a r t i c l e i n...Project) located in the Southern Marginal Zone of the Limpopo Belt north of the Northern Lobe of the Bushveld...succession and will therefore give an overview of the local geology. U/Pb baddeleyite ages for the main mafic |  | | Journal (article/letter/editorial) | | containing orthopyroxene lamellae), inverted pigeonite, interstitial quartz, and minor biotite and opaque...contain calcic plagioclase, augite, inverted pigeonite, interstitial quartz,. microcline, quartzāfeldspar...during each session by repeated analysis of the Phalaborwa baddeleyite reference standard, which has been...approximate, owing to large variation in 238U in the Phalaborwa standard, but are proportional to true values...with magmatic activity throughout much of southern Africa during the 1105 Ā± 2 Ma Umkondo igneous event (Hanson |  | | Journal (article/letter/editorial) | | chadacrysts. Pyroxene oikocrysts are zoned from pigeonite cores to augite rims. In nonpoikilitic areas,...Basaltic shergottites mainly consist of pyroxene (pigeonite and augite) and plagioclase. Olivinephyric shergottites...and a nonpoikilitic one consisting of olivine, pigeonite, augite with interstitial maskelynite. Based on...Lewis Cliff (LEW) 88516, GRV 99027, and Northwest Africa (NWA) 1950 (Miao et al. 2004; Lin et al. 2008a)...relationship between Pb+ ā U+ and UO2+ ā U+ relative to Phalaborwa baddeleyite standard (2059.6 Ma) (Heaman 2009) |  | | Journal (article/letter/editorial) | | U-Pb geochronology of the mare basalt Northwest Africa 10597: Implications for low-Ti mare volcanism around...U-Pb geochronology of the mare basalt Northwest Africa 10597: Implications for low-Ti mare volcanism around...U-Pb geochronology of the mare basalt Northwest Africa 10597: Implications for low-Ti mare volcanism around...meteorite collection. Found in 2015, Northwest Africa (NWA) 10597 is a medium-grained low-Ti mare basalt...one of the youngest basaltic units located in the south of the Aristarchus Plateau. The spatial and temporal |  | Zhou, Qin, Herd, Christopher D.K., Yin, Qing-Zhu, Li, Xian-Hua, Wu, Fu-Yuan, Li, Qiu-Li, Liu, Yu, Tang, Guo-Qiang, McCoy, Timothy J. (2013) Geochronology of the Martian meteorite Zagami revealed by UāPb ion probe dating of accessory minerals. Earth and Planetary Science Letters, 374. 156-163 doi:10.1016/j.epsl.2013.05.035 | Journal (article/letter/editorial) | | Zagami (NZ), is dominated by subequal amounts of pigeonite and augite ( 75 vol%) and maskelynite ( 20...and 238U16O2/238U against baddeleyite standard Phalaborwa (207Pb/206Pb Ā¼ 0.127198; t207/206 Ā¼2059.8 7 0...168 lithology (Fig. S1aāc). Pyroxene (mostly pigeonite), maskelynite (after igneous plagioclase), FeāTi...fayalite and a silica-rich phase occur adjacent to pigeonite phenocrysts (Fig. S1a). Fayalite occurs with inclusions...(similar to DML), as parts of assemblages of oxides, pigeonite and chlorapatite within maskelynite (e.g., Fig |  | Shaulis, B.J., Righter, M., Lapen, T.J., Jolliff, B.L., Irving, A.J. (2017) 3.1 Ga crystallization age for magnesian and ferroan gabbro lithologies in the Northwest Africa 773 clan of lunar meteorites. Geochimica et Cosmochimica Acta, 213. 435-456 doi:10.1016/j.gca.2017.06.031 | Journal (article/letter/editorial) | | AND FERROAN GABBRO LITHOLOGIES IN THE NORTHWEST AFRICA 773 CLAN OF LUNAR METEORITES B.J. Shaulis, M. Righter...AND FERROAN GABBRO LITHOLOGIES IN THE NORTHWEST AFRICA 773 CLAN OF LUNAR METEORITES, Geochimica et Cosmochimica...AND FERROAN GABBRO LITHOLOGIES IN THE NORTHWEST AFRICA 773 CLAN OF LUNAR METEORITES Shaulis B.J.1,2, Righter...98195 Version May, 2017 ABSTRACT The Northwest Africa (NWA) 773 clan of meteorites is a group of paired...sampled by manned or robotic missions. The Northwest Africa (NWA) 773 clan of meteorites is a group of paired |  | Wang, Ying, Hsu, Weibiao, Guan, Yunbin, Li, Xianhua, Li, Qiuli, Liu, Yu, Tang, Guoqiang (2012) Petrogenesis of the Northwest Africa 4734 basaltic lunar meteorite. Geochimica et Cosmochimica Acta, 92. 329-344 doi:10.1016/j.gca.2012.06.024 | Journal (article/letter/editorial) | | elsevier.com/locate/gca Petrogenesis of the Northwest Africa 4734 basaltic lunar meteorite Ying Wang a,b, Weibiao...geochronology of the lunar meteorite Northwest Africa (NWA) 4734 and make a comparison with the LaPaz...landings to the lunar mare, are absent. Northwest Africa (NWA) 4734 is an unbrecciated mare basalt found...instrumental drift (DM/M) within 2.5 ppm over 16 h. Phalaborwa baddeleyite was analyzed to calibrate the relative... The reproducibility of the PbāPb age of the Phalaborwa baddeleyite was within 0.9% (1r). 3. RESULTS |  | | Book | | periods of stability PLANET | 114 San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 om are uncommon...ct RIGHT: Round brilliant-cut white diamonds, South Africa and Canada Ā« 2.00 ct and 3.06 ct leaves the...Oklahoma, USA * 10 x 11 x 8 cm Talc, Mpumalanga, South Africa * 19 x 5 x 3cm Hardness 1 Hardness 4 Tale...Hardness 10 Quartz Diamond Diamond, Kimberley, South Africa * 0.5 x 0.5 x 0.5 cm | 19 MINERALS: PRODUCTS...crystals arranged in Cerussite, Broken Hill, New South Wales, Australia * 7 x 6 x 6 om Epidote, BrazilĀ» |  | | Journal (article/letter/editorial) | | proļ¬les of major elements in coexisting augite and pigeonite are homogenous and reļ¬ect a magmatic temperature...diameter baddeleyite grains from the Phalaborwa igneous complex, South Africa (crystallization age ā¼2059.8 Ma;...cathodoluminescence features from the shergottite Northwest Africa (NWA) 5298, which records a higher degree of shock...interfaces and Ca, Mg and Fe proļ¬les across augiteāpigeonite interfaces in the shergottite RBT 04262, which...consequence of the compositions of the augiteāpigeonite pair, provide additional constraints on the possible |  | | Journal (article/letter/editorial) | | in East Africa and Madagascar, together with the lower grade Arabian-Nubian Shield of NE Africa and Arabia...Science and Environment, The University of the South Paciļ¬c, Laucala Campus, Suva, Fiji Islands. E-mail...and high-pressure (HT/HP) rocks in the MB of East Africa and Madagascar has been interpreted as the result...99 1.17 0.00 0.00 99.75 Ferric form Si Al Ti Cr Ba Fe3 Mg Fe Mn Ca Na K Sum HS74 3.00 1.98 0.02 0.00...Representative EPMA analyses of orthopyroxene and pigeonite. Ideal cations 4.00 4.00 4.00 4.00 4.00 |  | | Journal (article/letter/editorial) | | phenocrysts in basaltic lunar meteorite Northwest Africa 032 Stephen M. Elardo* and Charles K. Shearer Jr...phenocrysts in basaltic lunar meteorite Northwest Africa (NWA) 032. This is only the third known occurrence...longer-scale core to rim normal magmatic zoning from pigeonite to augite compositions. Oscillatory zoning of...olivine and pyroxene in lunar meteorite Northwest Africa (NWA) 032, which is the focus of this study. The...meteorites (NWA 773, LaPaz Icefield 02205, Northeast Africa 003A, NWA 4734) with ages younger than the basaltic |  | Ramsay, R.R., Eves, A.E., Denyszyn, S.W., Wingate, M.T.D., Fiorentini, M., Gwalani, L.G., Rogers, K.A. (2019) Geology and geochronology of the Paleoproterozoic Hart Dolerite, Western Australia. Precambrian Research, 335. 105482 doi:10.1016/j.precamres.2019.105482 | Journal (article/letter/editorial) | | baddeleyite in a late-stage pigeonite vein in Hart Dolerite 120 km south of the Speewah Dome. These new...markers that can be used to correlate sequences at local, regional, and global scales (e.g. Haggerty, 1996;...elements. Examples include the Bushveld Complex in South Africa, the Norilsk and Talnakh chonolith intrusions...a vein of pigeonite gabbro that intrudes a sill of Hart Dolerite about 120 km to the south-southwest...latter exhibiting abundant granular and lamellar pigeonite exsolution. Within this interval, the lower 20 | | | Book | | A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...ct RIGHT: Round brilliant-cut white diamonds, South Africa and Canada Ā« 2.00 ct and 3.06 ct leaves the...for cutting other minerals. Tale, Mpumalanga, South Africa * 19 x 6 x 83cm Hardness 1 Hardness 4 Talc...Hardness 10 Quartz Diamond Diamond, Kimberley, South Africa * 0.5 x 0.5 x 0.5 cm | 19 MINERALS: PRODUCTS...structure of a feather. Cerussite, Broken Hill, New South Wales, Australia * 7 x 6 x 6 cm Epidote, Brazil |  | | Report (chapter) | | intrusive rocks underwent relatively low-grade local metamorphism and preserve cumulus and intracumulus...deposits. However, drilling and excavations in the south of Mt Kamennik reveal a strongly sheared and metamorphosed...mediumgrained and contain bronzite, augite (rare pigeonite), andesine-labradorite, hornblende, actinolite...apatite. Co-existing ortho- and clinopyroxenes, pigeonite and plagioclase of labradorite composition are...the coarsegrained slightly amphibolized host pigeonite gabbronorite. The sample is dominated by coarsegrained |  | Li, LiāXing, Li, HouāMin, Zi, JianāWei, Rasmussen, Birger, Sheppard, Stephen, Ma, YuāBo, Meng, Jie, Song, Zhe (2019) The link between an anorthosite complex and underlying olivineāTi-magnetite-rich layered intrusion in Damiao, China: insights into magma chamber processes in the formation of Proterozoic massif-type anorthosites. Contributions to Mineralogy and Petrology, 174 (6) doi:10.1007/s00410-019-1586-2 | Journal (article/letter/editorial) | | Ti-magnetite), 10ā20% plagioclase, 5ā20% inverted pigeonite and 5ā15% apatite with minor olivine, K-feldspar...fine-grained pyroxene (diopside and inverted pigeonite), ~ 25% FeāTi oxides and ~ 15% apatite with minor...clinopyroxene, Plag plagioclase, Pig inverted pigeonite, Opx orthopyroxene, Ser sericite, Zo zoisite ...picking. All the baddeleyite grains, together with Phalaborwa baddeleyite standard, were mounted in epoxy and...sensitivity of baddeleyite (Li et al. 2010b). The Phalaborwa baddeleyite standard was used to calibrate the |  | | Conference Proceedings (Volume) | | Far Southeast porphyry Cu-Au deposit, Mankanyan District, Philippines P 2.6 Caricchi L., Sheldrake T...M.: The Sakdrisi Au-Cu deposit, Bolnisi mining district, Georgia: providing a genetic model based on petrographic...record of this period yields abundant findings of local and imported ceramics, iron smelting slags and turned...energy filters. For some elements (Al, V, Mn, Mo, Ba) pressed-powder samples show systematically slightly...sections to be fully digitized in a matter of minutes. Local microfacies can then be identified using machine |  | | Journal (article/letter/editorial) | | calcite; o, olivine; e, enstatite Žor enstatiteāpigeoniteāaugite series in BG10.; d, diopside Žor mostly...than the Type II assemblage Ždiopside, augite, pigeonite, enstatite, labradoriterandesine, apatite, magnesiochromite...extends from 3.9 to 36.4% Wo, i.e., enstatite to pigeonite, sub-calcic augite and augite Žafter the classification...olivine. This formation of clinopyroxenes is always a local phenomenon Žon 1 to 40 mm in length. but develops...crystallized in the silicate matrix of Type II Pigeoniteāenstatite series SiO 2 Al 2 O 3 TiO 2 FeO MnO |  | Giacomoni, P. P., Coltorti, M., Bryce, J. G., Fahnestock, M. F., Guitreau, M. (2016) Mt. Etna plumbing system revealed by combined textural, compositional, and thermobarometric studies in clinopyroxenes. Contributions to Mineralogy and Petrology, 171 (4) doi:10.1007/s00410-016-1247-7 | Journal (article/letter/editorial) | | ApennineāMaghrebian belt which extends westward; (2) to the south, the undeformed northern margin of the African plate...from three subterminal craters (South East and North East and New South East Craters), and from eruptive...eruptions) Ellittico Ancient Alkaline Centers Pigeonite En Orthopyroxenes Fs Fig. 4āāComposition of...finer-scale oscillations are manifestations of local disequilibrium, while coarser oscillations arise... due to convection, with chemical and physical local heterogeneities inside the magma volume that can |  | | Book | | Australia in 1990, IDC-3 in Israel in 1995, IDC-4 in South Africa in 2001, IDC-5 in Finland in 2005, and IDC-6...newly identiļ¬ed early Cretaceous *135ā120 Ma LIP in South America. They suggest that the Rio CearĆ” Mirim dykes...Mashishing Dykes from the Eastern Kaapvaal Craton in South Africaā) provide new geochronological, geochemical...Mashishing Dykes from the Eastern Kaapvaal Craton in South Africa . . . . . . . . . . . . . . . . 215 H. Wabo...troctolite ring dyke/cone sheet of northwestern Africa (Moreau et al. 1995), and the circumferential dyke |  | | Book | | knowledge and understanding of the Archaean geology of South India. Among his pioneering works are studies of...well-preserved Archaean terrains, such as in the South Indian shield, and to build up and test models...CONTRIBUTORS C.R. Anhaeusser, Witwatersrand, 1 Africa. Economic Geol.ogy Research Unit, University of...of Jan Smuts Avenue, Johannesburg 2001, South F.W.U. Appel, The Geological Survey of Greenland, Oster...USSR Academy of Sciences, Chernogolvka, Moscow district, U . S . S . H . J. Foden, Bureau of Mineral Resources |  | Darling, James R., Moser, Desmond E., Barker, Ivan R., Tait, Kim T., Chamberlain, Kevin R., Schmitt, Axel K., Hyde, Brendt C. (2016) Variable microstructural response of baddeleyite to shock metamorphism in young basaltic shergottite NWA 5298 and improved UāPb dating of Solar System events. Earth and Planetary Science Letters, 444. 1-12 doi:10.1016/j.epsl.2016.03.032 | Journal (article/letter/editorial) | | the highlyshocked basaltic shergottite Northwest Africa (NWA) 5298, using high-resolution electron backscattered...020090 (192 Ā± 10 Ma; Jiang and Hsu, 2012), Northwest Africa (NWA) 5298 (187 Ā± 33 Ma, Moser et al., 2013), and...planetary materials. 2. Basaltic shergottite northwest Africa 5298 Meteorite NWA 5298 is an unbrecciated, evolved...mm in length, and are irregularly zoned from pigeonite to augite compositions (Hui et al., 2011). The...abundances (about 50 Ī¼g/g to 300 Ī¼g/g) compared to the Phalaborwa reference standard (51ā2124 Ī¼g/g; Heaman, 2009) |
|
