 | | Journal (article/letter/editorial) | | Mineralization in Peralkaline Granites from the Amis Complex, Brandberg (Namibia): Evidence for Magmatic Pre-enrichment...Germany Abstract The Amis Complex is a late intrusive phase associated with the Brandberg anorogenic granite...of the Amis Complex, Namibia, which is a satellite intrusion of the Early Cretaceous Brandberg anorogenic...of postmagmatic element redistribution in the Amis Complex. Mass-balance calculations that were performed...roofward enrichment. Geology of the Amis Complex Geologic setting The Brandberg massif (Daureb in the local Damara |  | | Journal (article/letter/editorial) | | In situ 238U-230Th disequilibrium dating of pyrochlore at sub-millennial precision FLorian WetzeL,1...dating to pyrochlore [(Ca,Na,REE,Th,U)2(Nb,Ti,Ta,Zr)2O6(OH,F)]. Compositionally zoned pyrochlore is an accessory...Eifel, Germany, 12.9 ka ago. Separated individual pyrochlore crystals were analyzed for U-Th isotopes and...vs. SIMS calibration curve, and the resulting pyrochlore isochron age of 26.1 ± 1.4 ka (including external...ages for the same sample. By contrast, AM206 pyrochlore from a Cretaceous alkali granite shows significant |  | Huang, He, Wang, Tao, Zhang, Zhaochong, Li, Chao, Qin, Qie (2018) Highly differentiated fluorine-rich, alkaline granitic magma linked to rare metal mineralization: A case study from the Boziguo’er rare metal granitic pluton in South Tianshan Terrane, Xinjiang, NW China. Ore Geology Reviews, 96. 146-163 doi:10.1016/j.oregeorev.2018.04.021 | Journal (article/letter/editorial) | | minerals at least including zircon, monazite, pyrochlore, Fe-Ti oxides, xenotime, bastnasite and astrophyllite...elements in the pluton are mainly contained by pyrochlore (Nb-Ta), zircon (Zr-Hf, Th-U and HREE) and monazite...(LREEs) grains. Mineral chemistry suggests that the pyrochlore and monazite are of primary igneous mineral....(LREEs) and contains rare minerals including pyrochlore, zircon, thorite, monazite, xenotime and bastnasite...minerals (e.g., biotite, amphibole, alkali feldspar, pyrochlore, monazite and zircon grains). Based on these |  | Bernard, Cyrielle, Estrade, Guillaume, Salvi, Stefano, Béziat, Didier, Smith, Martin (2020) Alkali pyroxenes and amphiboles: a window on rare earth elements and other high field strength elements behavior through the magmatic-hydrothermal transition of peralkaline granitic systems. Contributions to Mineralogy and Petrology, 175 (9). doi:10.1007/s00410-020-01723-y | Journal (article/letter/editorial) | | xenotime-(Y), fergusonite-(Y), loparite-(Ce) and eudialyte-group minerals (EGM) (Larsen and Sørensen 1987; Chakhmouradian...and Manongarivo (Donnot 1963) in Madagascar, Amis in Namibia (Schmitt et al. 2002), Evisa in Corsica (Bonin...of in-depth studies, such as the Strange Lake complex which was first studied in the late 1980’s (e.g...Ma Evisa Post-orogenic extension or rift 290 Ma Amis Rift 130 Ma Ambohimirahavavy Rift- 25 Ma Manongarivo...poorly known, as is the case for the Manongarivo complex, for which the only available information is a |  | | Journal (article/letter/editorial) | | zircon, monazite-(Ce), gagarinite-(Ce) and the pyrochlore group minerals. Magma evolution was monitored by...and HFSE-rich phases (zircon, monazite-(Ce), pyrochlore group). An alkali feldspar-rich crystal-mush containing...5 wt% REE) in the peralkaline Amis granite Complex, Brandberg, Namibia (Schmitt et al., 2002). Although... (2013) showed that in the Loch Loyal syenite complex, Scotland, magmatic concentration of the REE in...diorites and granitoids of the 1353–1290 Ma Nain complex and finally by silica under- and over-saturated |  | | Book | | REPUBLIC OF NAMIBIA - MINISTRY OF MINES AND ENERGY GEOLOGICAL SURVEY THE MINERAL RESOURCES OF NAMIBIA FIRST...ENERGY Of the several hundred minerals present in Namibia, around sixty have been exploited. some, such as...base metals and industrial minerals have helped Namibia rank amongst the top five mining countries in Africa...terms of production and reserves. In this context, Namibia is a major producer of copper, lead, zinc, cadmium...unpublished. It is evident that mineral exploration in Namibia, as elsewhere. has changed from serendipitous discoveries |  | Atencio, D., Andrade, M. B., Christy, A. G., Giere, R., Kartashov, P. M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48 (3) 673-698 doi:10.3749/canmin.48.3.673 | Journal (article/letter/editorial) | | 673-698 (2010) DOI : 10.3749/canmin.48.3.673 THE PYROCHLORE SUPERGROUP OF MINERALS: NOMENCLATURE Daniel ATENCIO§...Abstract A new scheme of nomenclature for the pyrochlore supergroup, approved by the CNMNC–IMA, is based...referred to until now as the pyrochlore group should be referred to as the pyrochlore supergroup, and the subgroups...Ta, Sb, Ti, and W. The recommended groups are pyrochlore, microlite, roméite, betafite, and elsmoreite...and one root name (identical to the name of the group). The first prefix refers to the dominant anion |  | | Journal (article/letter/editorial) | | peralkaline granitic pegmatite from the Amis complex (Namibia) for which data on the composition of the...REE-bearing minerals are monazite-(Ce) and pyrochlore-group minerals, which generally occur as euhedra...transsolvus granite include early monazite-(Ce) and pyrochlore but also later crystallising gagarinite-(Ce)...(melt inclusions) have been measured is the Amis pluton in Namibia (Schmitt et al., 2002). In the paragraphs...partition coefficients (Di) for the M4 site in the Amis arfvedsonite. The arfvedsonite from the sample (granitic |  | Sun, Zhenghao, Qin, Kezhang, Mao, Yajing, Tang, Dongmei, Wang, Fangyue, Evans, Noreen J., Zhou, Qifeng (2022) Mineral Chemistry of Pyrochlore Supergroup Minerals from the Boziguoer Nb-Ta-Zr-Rb-REE Deposit, NW China: Implications for Nb Enrichment by Alkaline Magma Differentiation. Minerals, 12 (7) 785 doi:10.3390/min12070785 | Journal (article/letter/editorial) | | minerals Article Mineral Chemistry of Pyrochlore Supergroup Minerals from the Boziguoer Nb-Ta-Zr-Rb-REE...; Evans, N.J.; Zhou, Q. Mineral Chemistry of Pyrochlore Supergroup Minerals from the Boziguoer Nb-Ta-Zr-Rb-REE...and 0.02 Mt Ta2 O5 . It is an alkaline felsic complex 4.45 km in length and 0.5–1.3 km in width, composed...aegirine). The Nb in the deposit is mainly hosted in pyrochlore supergroup minerals, ubiquitous in alkalic granite...in the A-site further classifies the Boziguoer pyrochlore supergroup minerals as fluornatropyrochlore, |  | Zozulya, Dmitry, Lyalina, Lyudmila, Macdonald, Ray, Bagiński, Bogusław, Savchenko, Yevgeny, Jokubauskas, Petras (2019) Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola Peninsula, NW Russia. Minerals, 9 (12) 732 doi:10.3390/min9120732 | Journal (article/letter/editorial) | | Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola...Abstract: The Keivy alkali granite-nepheline syenite complex, Kola Peninsula, NW Russia, contains numerous associated...Zr-REE-Y-Nb occurrences and deposits, formed by a complex sequence of magmatic, late-magmatic, and post-magmatic...of economic importance) and diverse britholite group minerals. The REE and actinides distribution in...crystallization of fluorbritholite-(Ce). Britholite group minerals (mainly fluorcalciobritholite and ‘calciobritholite’) |  | | Journal (article/letter/editorial) | | This mineralogical diversity, in addition to the complex geological history of the pluton, provides a unique...their formation conditions are still limited. The complex geological history of this pluton provides a unique...Pluton. (b) Geological map of the Wentworth pluton area showing the geographic distribution of the studied...faults (Koukouvelas et al. 2002). The plutonic complex was compartmentalized into smaller blocks with...than U, which is characteristic of the aeschynite group minerals (Ewing 1975). Furthermore, the analyzed |  | | Journal (article/letter/editorial) | | Mineralization in the Ambohimirahavavy Alkaline Complex, Madagascar Guillaume Estrade,1 Stefano Salvi,1...Abstract The Cenozoic Ambohimirahavavy alkaline complex in Madagascar consists of several syenitic to granitic...dikes intruding mudstone and limestone of the Isalo Group. A network of dikelets and veinlets propagates from...HFSE-rich phases are bastnäsite-(Ce), zircon, pyrochlore, Nb-rich titanite, and an unidentified F-rich...these conditions, the fluid was in the two-phase region and vapor dominated. The rare metals were deposited |  | | Journal (article/letter/editorial) | | Crystallization and destabilization of eudialyte-group minerals in peralkaline granite and pegmatite: a...a case study from the Ambohimirahavavy complex, Madagascar GUILLAUME ESTRADE *, STEFANO SALVI AND DIDIER...Editor: Katharina Pfaff ] ABSTR ACT Eudialyte-group minerals (EGM) are very common in highly evolved...pegmatitic granites from the Cenozoic Ambohimirahavavy complex, and assess the magmatic conditions required to...external Ca-bearing fluid. K E Y WO R D S : eudialyte-group minerals, peralkaline granites, agpaitic rocks, |  | | Journal (article/letter/editorial) | | post-magmatic products of the Keivy alkali granite complex, NW Russia Dmitry Zozulya, Ray Macdonald, Bogusław...post-magmatic products of the Keivy alkali granite complex, NW Russia, Ore Geology Reviews (2020), doi: https://doi...post-magmatic products of the Keivy alkali granite complex, NW Russia Dmitry Zozulya a,*, Ray Macdonald b... Zozulya). Abstract The Keivy alkali granite complex, Kola Peninsula, NW Russia, contains numerous Zr-REE-YNb...Zr-REE-YNb occurrences and deposits, formed by a complex sequence of pegmatitic, hydrothermal and metasomatic |
|
