 | | Journal (article/letter/editorial) | | Etendeka Volcanism of the Goboboseb Mountains and Messum Igneous Complex, Namibia. Part I: Geochemical Evidence...REVISED TYPESCRIPT ACCEPTED JULY 30, 1997 The Goboboseb Mountains and Messum Complex represent a major Cretaceous...lower sequence of mafic lavas, followed by the Goboboseb quartz latite members, the Messum Mountain Basalts...oxide phenocryst assemblages, and groundmass pigeonite and subcalcic augite. Stratigraphically, the LTZ...Energy, P.O. Box 2168, Windhoek 9000, Republic of Namibia. ‡ Present address: Research School of Earth Sciences |  | | Journal (issue) | | way out to the Gobobosebberge (Goboboseb Mountains) south of the Brandberg Mountai n, west of Uis. The Ras...10 cm. with 6 cm. Aquamarine Crystal, Erongo Mountains, Namibia. Author's collection. Stan Taylor photo...specimen is 5 cm., Ras Greeff Claim, Goboboseb Mountains, Namibia. Author's collection. Fig. 1: Ras Greeff...Greeff Claim, Goboboseb Mountains, Namibia. Author's photo. Fig. 5: Ras Greeff Claim, crystal cavity...center distance on the flat, barren plain, with Brandberg Mountain. in the distance. Author's photo. Fig |  | Lustrino, Michele, Melluso, Leone, Brotzu, Pietro, Gomes, Celso B., Morbidelli, Lucio, Muzio, Rossana, Ruberti, Excelso, Tassinari, Colombo C.G. (2005) Petrogenesis of the early Cretaceous Valle Chico igneous complex (SE Uruguay): Relationships with Paraná–Etendeka magmatism. Lithos, 82 (3) 407-434 doi:10.1016/j.lithos.2004.07.004 | Journal (article/letter/editorial) | | subordinate volcanic rocks and dykes cropping out over an area of about 250 km2. This complex is strictly linked...SiO2-rich rocks. Mineralogical (sporadic presence of pigeonite, Ca– Na and Na clinopyroxene, calcic- and calco-sodic...VC and the coeval Paresis granitoids (Etendeka, Namibia) are evidenced in this paper. The genetic similarities...latites (s.l.) of the Awahab Formation (Etendeka region, Namibia). D 2005 Elsevier B.V. All rights reserved...are located in Angola (Marzoli et al., 1999) and Namibia (Etendeka; Ewart et al., 1998a,b, 2004a,b; Thompson |  | | Journal (article/letter/editorial) | | Etendeka Volcanism of the Goboboseb Mountains and Messum Igneous Complex, Namibia. Part II: Voluminous Quartz...REVISED TYPESCRIPT ACCEPTED JULY 30, 1997 The Goboboseb–Messum volcanic centre is the source of two voluminous...voluminous silicic eruptive sequences, the Goboboseb quartz latites (Units I–III), and the Springbok quartz...Parana´ suggests eruptive volumes of ~2320 km3 (Goboboseb units) and 6340 km3 (Springbok unit). The latter...range from augite, to augite + pigeonite, to pigeonite, to pigeonite ± hypersthene, the assemblages changing |  | | Journal (article/letter/editorial) | | the Grootberg and Wereldsend quartz latites of Namibia, but the much higher Pb contents of the Namibian...a total volume estimated to exceed 1 Mkm³ and an area greater than 1.2 AC Mkm³ (Peate, 1997). Most of...volcanic rocks occuping approximately 2% of this area. The latter have unusually high temperatures, >1000°C...Polo et al., 2018). In Brazil, where the largest area of silicic volcanic rocks occur, they have been...Lucchetti et al., 2018). ACCEPTED MANUSCRIPT In Namibia all of the low-Ti silicic units are interpreted |  | Pankhurst, M. J., Schaefer, B. F., Betts, P. G., Phillips, N., Hand, M. (2011) A Mesoproterozoic continental flood rhyolite province, the Gawler Ranges, Australia: the end member example of the Large Igneous Province clan. Solid Earth, 2 (1). 25-33 doi:10.5194/se-2-25-2011 | Journal (article/letter/editorial) | | large-scale lobate fiows > 100 km in length. Pigeonite inversion thermometers indicate eruption temperatures...Polylhermai boundary Mol% Stewart (19941 • Pigeonite compositions \ o Augite compositions En / 0...pyroxene geothermometer after Lindsley (1983). Pigeonite and augite data from Creaser and White (1991)...within the province (Figs. 2 and 3) based on pigeonite inversion geothermometry (Lindsley, 1983) support...Photomicrograph (sample YD23, crossed-polarized light) of a pigeonite crystal within unaltered microcrystalline matrix |  | Bennio, L., Brotzu, P., D'Antonio, M., Feraud, G., Gomes, C.B., Marzoli, A., Melluso, L., Morbidelli, L., Morra, V., Rapaille, C., Ruberti, E. (2003) The tholeiitic dyke swarm of the Arraial do Cabo peninsula (SE Brazil): 39Ar/40Ar ages, petrogenesis, and regional significance. Journal of South American Earth Sciences, 16 (2) 163-176 doi:10.1016/s0895-9811(03)00030-0 | Journal (article/letter/editorial) | | present-day southern Brazil, Uruguay, Argentina, Namibia, and Angola were flooded by a broadly bimodal tholeiitic...1998; Thompson et al., 1998) have been found in the area of the Santos– Rio Early Cretaceous dyke swarm....al., 1986) for the dykes of the Arraial do Cabo area. Group a dykes ¼ squares, and Group b dykes ¼ circles...Ca32Mg26Fe42; TiO2 ¼ 0.12 –1.33 wt%; Fig. 3, Table 2). Pigeonite is occasionally present in basaltic andesites...Mesozoic Santos–Rio dyke swarm (MR19 and IT151, in the area of the Morro Redondo and Itatiaia alkaline massifs; |  | Zhang, Yi-Shen, Hou, Tong, Veksler, Ilya V., Lesher, Charles E., Namur, Olivier (2018) Phase equilibria and geochemical constraints on the petrogenesis of high-Ti picrite from the Paleogene East Greenland flood basalt province. Lithos, 300. 20-32 doi:10.1016/j.lithos.2017.11.011 | Journal (article/letter/editorial) | | material and the presence of low-Ca pyroxene (pigeonite) at high pressure in our PT E experiments, we...1), emplaced atop pre-Cretaceous rocks over an area of about 65000 km2 (Pedersen et al., 1997): they...of Paleogene flood basalts in the North Atlantic region. Previous studies have shown that North Atlantic...of tholeiitic flood basalts occurs in the inland region of MA Prinsen af Wales Bjerge (Hansen et al....of olivine (Ol), Cr-spinel (Sp), augite (Aug), pigeonite (Pig), orthopyroxene (Opx), plagioclase (Plag) |  | | Journal (article/letter/editorial) | | high temperature low pressure metamorphism in the region (the Hiltaba event; Betts and Giles, 2006; Betts...(oligoclase-andesine), Kfeldspar, orthopyroxene (pigeonite Mg#24–43, augite Mg#30–53), Fe–Ti oxide, ±quartz...ratio (ratio of diameter of circle with equivalent area and mean thickness) is up to ∼1:250 (Table 2). All...fiammebearing, layered Microcrystalline Outcrop area and volume are calculated by interpolation of outcrops... Aspect ratio: diameter of circle of equivalent area/average thickness. Eu- to sub-hedral Sub- to eu-hedral |  | Bryan, S.E., Cook, A., Evans, J.P., Colls, P.W., Wells, M.G., Lawrence, M.G., Jell, J.S., Greig, A., Leslie, R. (2004) Pumice rafting and faunal dispersion during 2001–2002 in the Southwest Pacific: record of a dacitic submarine explosive eruption from Tonga. Earth and Planetary Science Letters, 227 (1) 135-154 doi:10.1016/j.epsl.2004.08.009 | Journal (article/letter/editorial) | | plagioclase (An8874), augite (En35Fs29Wo36), pigeonite (En45Fs46Wo9), and titanomagnetite. Examined pumice...to other pumice-forming eruptions from the Tonga region. Most clasts stranded along eastern Australia were...eruption from any island volcano in the Tonga region, and the pumice was alternatively inferred to be...The southwest Pacific Ocean (Fig. 1) is an ideal area to examine the characteristics and dispersal of...sea-rafted pumice as it is bounded to the east by an area of active (both emergent and submerged) island arc |  | Sarmento, Carla Cecília Treib, Sommer, Carlos Augusto, Lima, Evandro Fernandes, Barreto, Carla Joana Santos, Rossetti, Lucas, Lafon, Jean Michel (2021) Mafic subvolcanic intrusions from the southern
Paraná‐Etendeka
Large Igneous Province, Brazil: Insights from geochemistry and
Sr–Nd–Pb
isotopes. Geological Journal, 56 (2). 1143-1166 doi:10.1002/gj.3993 | Journal (article/letter/editorial) | | et al., 2014, 2018; Val- also occur in western Namibia including the Henties Bay-Outjo ente et al., 2007;...basic with gramado lavas in the southeast outcrop area (Peate, intrusions and its correlation with the...fields formed of multiple from the central-eastern region of Rio Grande do Sul State; (b) to lobes of basalt...relationship the most primitive compositions in the area (>5 wt% MgO), and by between dikes of the Paraná...stratigraphy (Torres and Vale do in western Africa, in Namibia and Angola (Jerram et al., 2019; Sol formations) |  | | Report (issue) | | 4IJArf39Ar geochronology from the Sangre de Cristo Mountains, south-central Colorado and northern New Mexico...Valente 159 II. Volcanic passive tnlll'gin of Namibia: A B. Corner, J. Canwright, and R. Swan pote~tialfields...normal asthenosphere provide an appropriate source region? Is the lower continental lithosphere wet enough...in these margins by oil and ga companie . Future area of interest include the nature of the lithosphere-asthenosphere...magmatic hiatus, erosion of newly formed rift mountains, and the formation of high-velocity lower crust |  | | Journal (article/letter/editorial) | | Previous experimental studies relevant to this area (Vander Auwera & Longhi, 1994; Vander Auwera et...geological map of southern Norway [inset shows the area of the Sveconorwegian orogen (in grey); B-K, Bamble–Kongsberg...apatite; Lpx, low-calcium pyroxene (orthopyroxene or pigeonite). 2412 Downloaded from http://petrology.oxfordjournals...clinopyroxene, low-Ca pyroxene (either orthopyroxene or pigeonite), amphibole, biotite, plagioclase, magnetite,...% H2Omelt. At low H2Omelt, a low-Ca pyroxene (pigeonite or orthopyroxene; Table 9) crystallizes with the |  | | Book | | Republic, 6 cm). Figure 1.2 Halite crystals (Namibia, 5.8 cm). 6 section devoted to the display of...in groups 8–12, show marked deviation. In this region of the Periodic Table, electronegativity increases...bonded substances, the electrons are confined to the region between the nuclei of the bonded atoms and they...Fluorite showing stepped, cubic crystal faces (Erongo, Namibia, 5.8 cm). hence occurs less commonly. Figure...(left, 6 cm) and grossular garnet (both from Kayes region, Mali); (C) grossular (Jeffrey mine, Canada, 5 |  | Choudhary, Babita R., Ernst, Richard E., Xu, Yi-Gang, Evans, David A.D., de Kock, Michiel O., Meert, Joseph G., Ruiz, Amarildo S., Lima, Gabrielle A. (2019) Geochemical characterization of a reconstructed 1110 Ma Large Igneous Province. Precambrian Research, 332. 105382 doi:10.1016/j.precamres.2019.105382 | Journal (article/letter/editorial) | | Moabi et al., 2017), and also in the MidContinent region of North America (Keweenawan LIP) (Heaman et al...dated NW-NNW trending Epembe dykes of northern Namibia as a single Huila-Epembe swarm, as well as an approximately...Huanchaca Suite intrude the Aguapeí Group in a region not 7 affected by the deformation and metamorphism...ultramafic, and alkaline intrusions in the Lake Nipigon region at 1115–1110 Ma was followed by a major pulse of...Grunehogna terrane of Antarctica also contains a region in Dronning Maud Land with 1110 Ma LIP magmatism |  | | Book | | Africa 194 3.5.2. The Damaraland alkaline province, Namibia 198 3.5.3. Carbonatites 199 3.5.4. Kimberlites...metamorphism in the Central Zone ofthe Damara Orogen, Namibia 6.3.2. Anorogenic metamorphism in the eastern Pyrenees...that metals, oxides and silicate dominated in the region between Mercury and the asteroid belt. Details...crystallographic axes will aceeierate in the given region, thereby providing another way of mapping out hot...other of the above cases dominating in a given region. More recently, measurements of crustal Poisson's |  | Ngonge, Emmanuel Donald, de Hollanda, Maria Helena Bezerra Maia, Archanjo, Carlos José, de Oliveira, Diógenes Custódio, Vasconcelos, Paulo Marcosde Paula, Muñoz, Patrício Rodrigo Montecinos (2016) Petrology of continental tholeiitic magmas forming a 350-km-long Mesozoic dyke swarm in NE Brazil: Constraints of geochemical and isotopic data. Lithos, 258. 228-252 doi:10.1016/j.lithos.2016.04.008 | Journal (article/letter/editorial) | | plagioclase, clinopyroxene (±olivine), Fe-Ti oxides and pigeonite in their groundmass. These tholeiites have been...NU emplaced as linear sets of dykes covering an area of approximately 12,500 km2 (Fig.1) marking the...processes led to the break-up of this major continental area, especially from the Early Jurassic to the Late...tholeiites which are typically confined to the western region. ED On the basis of the dataset presented in...groundmass (Wo37.7En46Fs16.2) together with rare pigeonite (according to one analysis shown in Appendix 2) |  | Alizadeh, Elahe, Ghadami, Gholamreza, Esmaeily, Dariush, Ma, Changqian, Lentz, David R, Omrani, Jafar, Golmohammadi, Abbas (2018) Origin of 1.8 Ga zircons in Post Eocene mafic dikes in the Roshtkhar area, NE Iran. International Geology Review, 60 (15) 1855-1882 doi:10.1080/00206814.2017.1396259 | Journal (article/letter/editorial) | | zircons in Post Eocene mafic dikes in the Roshtkhar area, NE Iran Elahe Alizadeh, Gholamreza Ghadami, Dariush...zircons in Post Eocene mafic dikes in the Roshtkhar area, NE Iran, International Geology Review, DOI: 10...zircons in Post Eocene mafic dikes in the Roshtkhar area, NE Iran Elahe Alizadeha, Gholamreza Ghadamia, Dariush... Iran ABSTRACT ARTICLE HISTORY The Roshtkhar area is located in the Khaf-Kashmar-Bardaskan volcano-plutonic...subvolcanic rocks occurring mainly as dikes in the area, which intruded into Cenozoic intrusive rocks. We |  | | Book | | papers and 19 geological maps in Western Australia, Namibia and Greenland. Throughout his career, which has...Nova Scotia, Canada . 4.3.9 The Brandberg West Greisen Vein Systems, Namibia . . 4.3.10 The Kalguta Mo-W-Be-Bi.... . . . . . . . . . . . . . . 6.5.1 Navachab, Namibia. . . . . . . . . . . . . . . . . . . . . . . ....Cu Deposits of the Matchless Amphibolite Belt, Namibia . . . . . . . . . . . . . . . . . . . . . . . 7...Pb-Zn-Cu-Ag-V Deposits of the Otavi Mountain Land, Namibia . . . . . . . . . . . . . . . . . . . . . . . |  | | Journal (article/letter/editorial) | | The Bunbury Basalt, although only covering a small area in the Cape Naturaliste–Cape Leeuwin Peninsula,...discoveries in the West Musgrave and in the Kimberley region, the LIPs in these regions have good mineral potential...2–54 2.4. 1.8–1.7 Ga Hart-Carson LIP, Kimberley region . . . . . . . . . . . . . . . . 2.4.1. Carson Volcanics...the Central Atlantic Magmatic Province (estimated area of ca. 7 × 106 km2), the Ontong Java oceanic plateau...Australia; those discussed in this paper are underlined. Region or tectonic unit Event number in Table 1 of Ernst |  | | Book | | conference proceedings. It covers the entire research area of geology including, but not limited to, economic...atm fO2 . Proterozoic mafic dykes from the Bomdila area, NE Lesser Himalaya, India, have been studied for...Significance of the Proterozoic Mafic Dykes from the Bomdila Area, NE Lesser Himalaya, India”). Geochemistry of these...Significance of the Proterozoic Mafic Dykes from the Bomdila Area, NE Lesser Himalaya, India . . . . . . . . . . ...are usually thought to be emplaced from a focal region above a mantle plume (e.g., Halls 1982; Ernst and |  | | Report (issue) | | authors also consider the mineral deposits of the region, indicating their spatial and temporal association...quite clearly that southern México is a complex region with a stratigraphic record that begins in the...Middle America and the Gulf of Mexico-Caribbean Sea region during Mesozoic time: Geological Society of America...carpet of the Sierra Madre Occidental covers an area of ~300,000 km2 (McDowell and Keizer, 1977; McDowell...W E Boundary between area with east or west tilting of rocks Limit of area affected by Tertiary extension |
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