Magma chamber processes in the Tellnes ilmenite deposit (Rogaland Anorthosite Province, SW Norway) and the formation of Fe–Ti ores in massif-type anorthosites

Charlier, Bernard; Duchesne, Jean-Clair; Auwera, Jacqueline Vander

doi:10.1016/j.chemgeo.2006.05.007

Cited by 72 publications

(45 citation statements)

References 61 publications

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“…The morphology, microstructures and magnetic fabric of the Tellnes ilmenite deposit were interpreted by Diot et al (2003) as resulting from the synemplacement deformation of a noritic crystal mush injected into a strike-slip weakness zone cutting across the Åna-Sira anorthosite. This interpretation has been challenged by Charlier et al (2006), who proposed that the Tellnes ore body represents a sill deformed during gravity-induced subsidence due to the higher density of the Fe-Ti oxide-rich rocks compared to the less-dense host anorthosite, possibly coupled with up-doming of the latter. This deformation mechanism is similar to that proposed to explain the deformation of the BjerkreimSokndal layered intrusion (Paludan et al, 1994;Bolle et al, 2000Bolle et al, , 2002.…”

Section: Structural Analysis and Deformationmentioning

confidence: 93%

“…Major examples occur in the Layered Series of the Bjerkreim-Sokndal layered intrusion, which outcrops over 230 km 2 and consists of a 7000 m-thick sequence of cumulates made up of anorthosite, troctolite, leuconorite, norite, gabbronorite, jotunite and mangerite (Wilson et al, 1996). Fe-Ti-P-enriched rocks occur at the top of the Layered Series, where huge volumes of rocks with 5-7 wt.% TiO 2 and 4-5 wt.% P 2 O 5 have been reported ( Charlier et al, 2006Charlier et al, , 2007Charlier et al, , 2009Chen et al, 2013). …”

Section: Stratiform Depositsmentioning

confidence: 99%

“…930 Ma (Schärer et al, 1996). The Tellnes ilmenite deposit is situated in the center of the easternmost anorthosite body, the Åna-Sira anorthosite massif Charlier et al, 2006).…”

Section: Spatial and Temporal Distributionmentioning

confidence: 99%

“…(1) Duchesne (1999); (2) Krause and Zeino-Mahmalat (1970); (3) Charlier et al (2006); (4) Charlier et al (2007); (5) Krause et al (1985); (6) Duchesne and Korneliussen (2003); (6b) Force (1991); (7) Wilson et al (1996); (8) Duchesne and Charlier (2005); (9) (2010); (14) Duchesne (1969); (14b) Ball (1907); (15) Lindsley et al (1988); (16) Lindsley (2003); (17) Corriveau et al (2007); (18) Rose (1969); (19) Schrijver (pers. comm.…”

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confidence: 99%

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Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Charlier

Namur

Bolle

et al. 2015

Earth-Science Reviews

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a b s t r a c t a r t i c l e i n f oMagmatic rocks containing economic concentrations of iron, titanium, vanadium and phosphorous are commonly associated with massif-type anorthosites and related rocks. This rock association is part of the anorthositemangerite-charnockite-(rapakivi-)granite suites that are restricted to the Proterozoic. Understanding the geochemistry and emplacement mechanisms of ilmenite, magnetite and apatite ore deposits is crucial for exploration, efficient mining operations and ore processing. This review discusses the controlling factors on the grade of an ore, its mineralogy, and its major and trace element distribution. We present petrogenetic models of currently mined deposits (Lac Tio, Tellnes, Damiao) and discuss the characteristics of minor ore bodies from anorthosite provinces worldwide (Grenville, North China Craton, East European Craton, Rogaland, Laramie). Models of formation of anorthosite and related rocks are presented, as well as the nature of the possible parental magmas of the suite. A mineralogical classification of Fe-Ti ores is proposed: (1) Gabbro-noritic ilmenite ore ± apatite ± magnetite; (2) Ti-magnetite-dominated ore; (3) Nelsonite (Fe-Ti oxides + apatite); and (4) Rutile-ilmenite ore. The stability of ilmenite and magnetite is then critically reviewed and the influence of various factors, particularly oxygen fugacity and crystallization pressure, is examined. We discuss liquidus compositions of Fe-Ti oxides and the behavior of important trace elements such as Cr and V, both of which are sensitive to fO 2 variations. Postcumulus evolution of both oxides can occur due to re-equilibration with trapped liquid, re-equilibration with ferromagnesian silicates, exsolution, oxidation, reaction between ilmenite and magnetite, and metamorphic overprinting. These various processes are described and their effects on the oxide geochemistry are emphasized. Several potential ore-forming processes have been invoked and can explain the formation of huge concentration of ilmenite, ±magnetite, ±apatite. Fractional crystallization can be combined with crystal sorting and plagioclase buoyancy to produce relative enrichment of dense ore minerals. Silicate liquid immiscibility can segregate conjugate Si-rich and Fe-rich melts, the latter being enriched in Fe-Ti-P. Magma mixing can produce hybrid magmas located in a single-phase field of the phase diagram and precipitate a pure ilmenite cumulate. Alternative processes are also described, such as ejection of Fe-Ti-enriched residual melts by filter-pressing and compaction, solidstate remobilization of ilmenite in veins, and hydrothermal transport of Fe and Ti from the host anorthosite followed by concentration in veins and lenticular ore bodies. The magnetic properties of Fe-Ti ore deposits present contrasting signatures, depending on whether the natural remanent magnetization is dominated by hemo-ilmenite or multi-domain magnetite. Micro-and macro-scale deformation features of ore rocks are intimately correlated with magma emplacement, and...

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Section: Structural Analysis and Deformationmentioning

confidence: 93%

Section: Stratiform Depositsmentioning

confidence: 99%

“…930 Ma (Schärer et al, 1996). The Tellnes ilmenite deposit is situated in the center of the easternmost anorthosite body, the Åna-Sira anorthosite massif Charlier et al, 2006).…”

Section: Spatial and Temporal Distributionmentioning

confidence: 99%

mentioning

confidence: 99%

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Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Charlier

Namur

Bolle

et al. 2015

Earth-Science Reviews

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“…Além de sua importância petrológica e geotectônica, os anortositos ainda constituem importante fonte para minérios de ferro, titânio, fósforo, elementos do grupo da platina, níquel e cobre (Charlier et al 2006(Charlier et al , 2007Mukherjee et al 2005;Areback & Stigh 2000), bem como caulim e alumínio (Schenato & Formoso 1993).…”

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Estruturas primárias e tectônicas do Anortosito Capivarita, Pântano Grande (RS): significado e implicações na sua evolução petrológica

Philipp¹,

Formoso²,

Dossin³

et al. 2010

RBG

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Revista Brasileira de GeociênciasRuy Paulo Philipp et al. 40(1): 99-110, março de 2010 Arquivo digital disponível on-line no site www.sbgeo.org.br 99Estruturas primárias e tectônicas do Anortosito Capivarita, Pântano Grande (RS): significado e implicações na sua evolução petrológica Resumo O Anortosito Capivarita é uma unidade de idade Mesoproterozóica, constituída por anortositos, com presença subordinada de anortositos com granada, metagabros e anfibolitos. Apresenta relações intrusivas com os paragnaisses de alto grau do Complexo Várzea do Capivarita e encontra-se como pendentes de teto nos Granitos Encruzilhada do Sul e Pitangueiras, de idade Neoproterozóica. Estudos estruturais, petrográficos e mineralógicos caracterizaram os anortositos e os gabros como representantes de um magmatismo metaluminoso relacionado a série toleítica. Os protólitos são dominados por anortositos, com ocorrência de corpos tabulares de composição gabróica e níveis de granada anortositos e rochas ricas em óxidos de Fe-Ti, constituindo uma associação de anortosito do tipo maciço. A estrutura bandada é definida por variação composicional e de tamanho de grão, indicando que os anortositos apresentam uma evolução relacionada a processos de fracionamento mineral. As feições estruturais, petrográficas e os padrões composicionais são muito similares aos descritos em anortositos de idade Paleoproterozóica. A presença dominante de anortositos, com anfibolitos associados sugere que a porção principal desta associação pode representar acumulações de plagioclásio formadas pelo fluxo magmático e/ou por flotação, associada ao assentamento gravitacional. As feições estruturais primárias e composicionais dos anortositos sugerem que este magmatismo ocorreu sob condições anorogênicas, em um ambiente estável, provavelmente cratônico. Após a sua cristalização o anortosito foi afetado por um evento de metamorfismo regional orogênico sob condições da fácies anfibolito superior a Granulito. Palavras-chave:Anortosito Capivarita, gabros, tipo maciço, septos do embasamento, Cinturão Dom Feliciano. Abstract Primary and tectonics structures of Capivarita Anortosite, Pântano Grande, RS: meaning and implication from petrologic evolution. The Capivarita Anorthosite is a unit of Mesoproterozoicage constituted by anorthosite with subordinate presence of garnet anorthosite, metagabros and amphibolites. The anorthosite shows intrusive relationship with high degree paragneisses of Várzea do Capivarita Complex and occurs as a roof pendant in the Neoproterozoic Encruzilhada do Sul and Pitangueiras granites. Structural, petrographic and mineralogical studies characterized the anorthosite and amphibolites as magmatism probably related to tholeitic series. The protoliths are dominated by anorthosites with occurrence of garnet anorthosites and rocks rich in Fe-Ti oxides, constituting an association of massif-type anorthosite. The banded structure is defined by regular variations in composition and size of grains, probably related to mineral fractionation process. The str...

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Magmatic Deposits

Neukirchen¹,

Ries²

2020

The World of Mineral Deposits

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Magma chamber processes in the Tellnes ilmenite deposit (Rogaland Anorthosite Province, SW Norway) and the formation of Fe–Ti ores in massif-type anorthosites

Cited by 72 publications

References 61 publications

Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Estruturas primárias e tectônicas do Anortosito Capivarita, Pântano Grande (RS): significado e implicações na sua evolução petrológica

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