 | | Journal (article/letter/editorial) | | which have only 5â10 wt% K2O. Keywords: fenite, carbonatite, sodic metasomatism, potassic metasomatism, K-feldspar...(Traduit par la RĂ©daction) Mots-clĂ©s: fĂ©nite, carbonatite, mĂ©tasomatose sodique, mĂ©tasomatose potassique...understood to be âalkali silicate and associated carbonatite igneous activityâ. Although a side issue from...descent relationship between silicate magma and carbonatite magmaâ, and therefore the word § E-mail address:...within 20 km of each other; each has coexisting carbonatite and nephelinite. In this contribution, I consider |  | Rampilova, Maria, Doroshkevich, Anna, Viladkar, Shrinivas, Zubakova, Elizaveta (2021) Mineralogy of Dolomite Carbonatites of Sevathur Complex, Tamil Nadu, India. Minerals, 11 (4) 355 doi:10.3390/min11040355 | Journal (article/letter/editorial) | | Research, Bhopal 462066, India; sviladkar@gmail.com Carbonatite Research Centre, Amba Dongar, Kadipani 390117...of the Sevathur carbonatite complex (Tamil Nadu, India) consists of dolomite carbonatite with a small number...number of ankerite carbonatite dikes. Calcite carbonatite occurs in a very minor amount as thin veins...veins within the dolomite carbonatite. The age (207 Pb/204 Pb) of the Sevathur carbonatites is 801 ± 11 Ma...trending fault systems. Minor minerals in dolomite carbonatite are fluorapatite, phlogopite (with a kinoshitalite |  | | Journal (article/letter/editorial) | | production of Nb, with the primary St. HonorĂ© carbonatite and other sources accounting for only for 7 and...individual petrographically-deïŹned units of carbonatite contain distinct suites of pyrochlore. Bulk rock...10 times or more above those of the primary carbonatite. Commonly, pyrochlores in laterites are ïŹne grained...and 1%, respectively. Mining at the CatalĂŁo-I carbonatite was discontinued in 2001, although there is a...(Cordeiro et al., 2011). Many other occurrences of carbonatite are currently being evaluated [e.g. Aley and |  | 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) | | (albite, K-feldspar, quartz, arfvedsonite and aegirine). The Nb in the deposit is mainly hosted in pyrochlore...supergroup minerals from other rocks such as carbonatite and nepheline syenite, which are dominated by...may be significantly different from those in carbonatite and nepheline syenite, and that magmatic differentiation...while there are numerous studies focused on carbonatite- and granitic pegmatite-related Nb deposits [3â7]...results are further compared with those from carbonatite and nepheline syenite in order to investigate |  | Starikova, Anastasia E., Bazarova, Ekaterina P., Savelâeva, Valentina B., Sklyarov, Eugene V., Khromova, Elena A., Kanakin, Sergei V. (2019) Pyrochlore-Group Minerals in the Granite-Hosted Katugin Rare-Metal Deposit, Transbaikalia, Russia. Minerals, 9 (8) 490 doi:10.3390/min9080490 | Journal (article/letter/editorial) | | or slightly later than melanocratic minerals (aegirine, biotite, and arfvedsonite) at the late magmatic...and REE. They are common accessory phases in carbonatite and are often found in such lithologies as nepheline...biotite-arfvedsonite (Bt-Arf); and arfvedsonite, aegirine-arfvedsonite and aegirine (Arf, Aeg-Arf, and Aeg) granites...minerals. At the same time, some arfvedsonite and aegirine granites appear as isolated pegmatitic veins....biotite-arfvedsonite (4), biotite arfvedsonite (5), aegirine-arfvedsonite and aegirine (6); = ore-bearing (5), granite; |  | | Journal (article/letter/editorial) | | REE, and Y contents gradually increased. All carbonatite types are suggested to contain initial fluorcalciopyrochlore...from melt inclusions in minerals from calcite carbonatite and ijolite (Panina and Podgornykh, 1975, 1979;...reactions and hydration during the evolution of carbonatite complexes. This reflects on the content and behavior...duringthe multistage formation of the Belaya Zima carbonatite complex. This provides insight into the role...GEOLOGICAL AND MINERALOGICAL DESCRIPTION The carbonatite complex is located in the Tulun district, Irkutsk |  | | Journal (article/letter/editorial) | | island of SaÌo Vicente has the most abundant carbonatite outcrops in the Cape Verde Islands. A ïŹeld survey...extrusive carbonatites, carbonatite dykes and small apophyses of intrusive carbonatite. These outcrops are...nephelinite crystallization and high-temperature carbonatite immiscibility. The carbonatitic melts crystallized...1993). SaÌo Vicente has the greatest number of carbonatite exposures (Gerlach et al., 1988), including calcitic...they must also be studied to fully understand carbonatite genesis. In this work we present ïŹeld, petrographic |  | | Book | | GeoGuide Peter Kresten Valentin R. Troll The Alnö Carbonatite Complex, Central Sweden GeoGuide Series editors... Peter Kresten Valentin R. Troll âą The Alnö Carbonatite Complex, Central Sweden 123 Peter Kresten...works where a magmatic origin was proposed for carbonatiteâalkaline silicate rock associations focused on...Archaean to the present. The only currently active carbonatite volcano, Oldoinyo Lengai (Fig. 1a) in the East...northern Tanzania, stands out from the other carbonatite occurrences in the world because of its unusually |  | | Journal (article/letter/editorial) | | fluid evolution of alkaline rock or related carbonatite type NbâTa deposits. The PanzhihuaâXichang (Panxi)...either carbonatites or felsic igneous rocks [1]. Carbonatite is reserved for igneous rocks containing 50%...ankerite, or siderite). In rare-metal deposits of carbonatite, Nb is more common than Ta, and they usually...arfvedarfvedsonite aegirine pegmatite and granite pegmatite sonite syenitesyenite dikes, dikes, aegirine pegmatite...(50â60%), albite aegirine (5â10%), structure. The albite(10â20%), (10%â20%), aegirine (5%â and arfvedsonite |  | DolnĂÄek, ZdenÄk, KropĂĄÄ, Kamil, Uher, Pavel, PolĂĄch, Martin (2010) Mineralogical and geochemical evidence for multi-stage origin of mineral veins hosted by teschenites at TichĂĄ, Outer Western Carpathians, Czech Republic. Geochemistry, 70 (3) 267-282 doi:10.1016/j.chemer.2010.03.003 | Journal (article/letter/editorial) | | ïŹrst stage is composed of titanite, aegirine-augite to aegirine, annite, analcime and strontian apatite...reached 390â510 1C for early phases, titanite and aegirine-augite. The second stage is formed by calcite...Hydrothermal alteration Mineralogy Geochemistry Aegirine Fluid inclusions Stable isotopes Outer Western...assemblage involving, inter alii, also titanite, aegirine-augite and Sr-minerals. The speciïŹc mineral composition...of clinopyroxene (augite to diopside with rare aegirine-augite rims), brown amphibole (kaersutite), Ti-rich |  | | Journal (article/letter/editorial) | | Analogues of these varieties are present in many carbonatite complexes. The aim of this study was to investigate...strength elements during the late stages of carbonatite formation. We conducted a multilateral study...the late hydro (carbo) thermal stage of the carbonatite formation and high migration capacity of Ti and...50 modal percent carbonate [1]. Varieties of carbonatite are named based on the dominant carbonate mineral...well. Most of the known carbonatite complexes have a common scheme of carbonatite genesis, whereby early |
|
