Magmatic features of iron ores of the Kiruna type in Chile and Sweden; ore textures and magnetite geochemistry

Nystroem, Jan Olov; Henríquez, Fernando

doi:10.2113/gsecongeo.89.4.820

Cited by 267 publications

(122 citation statements)

References 19 publications

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“…However, the BF slags used in this study, M-kalk and Merit 5000, were high in vanadium because of naturally high vanadium levels in the iron ore [4]. The total vanadium concentrations in the M-Kalk and Merit 5000 were 803 and 783 mg kg -1 respectively, of which 85 and 72 % was recovered by aqua regia digestion (Table 1).…”

Section: Vanadium Concentrations and Speciation In Slags And Soilsmentioning

confidence: 92%

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Vanadium bioavailability in soils amended with blast furnace slag

Larsson

Baken

Smolders

et al. 2015

Journal of Hazardous Materials

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Blast furnace (BF) slags are commonly applied as soil amendments and in road fill material. In Sweden they are also naturally high in vanadium. The aim of this study was to assess the vanadium bioavailability in BF slags when applied to soil. Two soils were amended with up to 29 % BF slag (containing 800 mg V kg -1 ) and equilibrated outdoors for 10 months before conducting a barley shoot growth assay. Additional soil samples were spiked with dissolved vanadate(V) for which assays were conducted two weeks (freshly spiked) and 10 months (aged) after spiking. The BF slag vanadium was dominated by vanadium(III) as shown by V K-edge XANES spectroscopy. In contrast, results obtained by HPLC-ICP-MS showed that vanadium(V), the most toxic vanadium species, was predominant in the soil solution. Barley shoot growth was not affected by the BF slag additions. This was likely due to limited dissolution of vanadium from the BF slag, preventing an increase of dissolved vanadium above toxic thresholds. The difference in vanadium bioavailability among treatments was explained by the vanadium concentration in the soil solution. It was concluded that the vanadium in BF slag is sparingly available. These findings should be of importance in environmental risk assessment.

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Section: Vanadium Concentrations and Speciation In Slags And Soilsmentioning

confidence: 92%

“…The trace element concentrations of the BF slags depend mainly on the background concentrations in the ore. The iron ore mined in Sweden is found in an area with naturally high vanadium concentrations [4]. This results in BF slags that are naturally high in vanadium and concentrations can reach above 500 mg V kg -1 [5].…”

Section: Introductionmentioning

confidence: 99%

Vanadium bioavailability in soils amended with blast furnace slag

Larsson

Baken

Smolders

et al. 2015

Journal of Hazardous Materials

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“…Formation of larger monazite grains at the expense of smaller grains; intergrowth of monazite with magnetite, and development of allanite are due to late stage fluid-aided reaction of monazite with surrounding silicate minerals (cf. [1,13,53,54,57,58]). These features appear to be common in other Bafq district magnetite-apatite deposits, such as Esfordi, Se-Chahun, Choghart, and Mishdovan [18,20,28,35,36,52].…”

Section: Textural and Mineral Chemical Evidencementioning

confidence: 99%

“…Various studies of IOA deposits have proposed different petrogenetic models including magmatic (e.g., [58,66]), magmatic-hydrothermal [67], hydrothermal (-metasomatic) (e.g., [68][69][70]), and sedimentary exhalative (e.g., [71,72]). For the Bafq district, some researchers have referred to a magmatic model [17,28,73,74], whereas Torab and Lehmann (2007) [35], Jami (2005) [21], and Daliran (2010) [19] considered high-T hydrothermal fluids as being responsible for generation of some Bafq IOA deposits.…”

Section: Nature Of Fluidsmentioning

confidence: 99%

Multiple Stage Ore Formation in the Chadormalu Iron Deposit, Bafq Metallogenic Province, Central Iran: Evidence from BSE Imaging and Apatite EPMA and LA-ICP-MS U-Pb Geochronology

et al. 2018

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Abstract:The Chadormalu magnetite-apatite deposit in Bafq metallogenic province, Central Iran, is hosted in the late Precambrian-lower Cambrian volcano-sedimentary rocks with sodic, calcic, and potassic alterations characteristic of iron oxide copper-gold (IOCG) and iron oxide-apatite (IOA) ore systems. Apatite occurs as scattered irregular veinlets and disseminated grains, respectively, within and in the marginal parts of the main ore-body, as well as apatite-magnetite veins in altered wall rocks. Textural evidence (SEM-BSE images) of these apatites shows primary bright, and secondary dark areas with inclusions of monazite/xenotime. The primary, monazite-free fluorapatite contains higher concentrations of Na, Si, S, and light rare earth elements (LREE). The apatite was altered by hydrothermal events that led to leaching of Na, Si, and REE + Y, and development of the dark apatite. The bright apatite yielded two U-Pb age populations, an older dominant age of 490 ± 21 Ma, similar to other iron deposits in the Bafq district and associated intrusions, and a younger age of 246 ± 17 Ma. The dark apatite yielded a U-Pb age of 437 ± 12 Ma. Our data suggest that hydrothermal magmatic fluids contributed to formation of the primary fluorapatite, and sodic and calcic alterations. The primary apatite reequilibrated with basinal brines in at least two regional extensions and basin developments in Silurian and Triassic in Central Iran.

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“…4) (Ruiz et al, 1965;Espinoza, 1990;Nyström and Henríquez, 1994;Sillitoe, 2003;Gelcich et al, 2005;Maksaev et al, 2007). The Atacama Fault Zone is a major sinistral, strike-slip fault system that extends along the Coastal Cordillera for more than 1,000 km between latitudes 20° and 30° (Arabasz, 1971;Scheuber and González, 1999) (Fig.…”

Section: Metallogenic Settingmentioning

confidence: 99%

Determinaciones geocronológicas y termocronológicas para la mineralización de cobre porfídico en la zona de alteración de Domeyko, norte de Chile.

Maksaev

Almonacid

Munizaga

et al. 2010

Andgeo

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ABsTrACT. At Domeyko, 40 km south of Vallenar in northern Chile (28°57'S-70°53'W), the Dos Amigos and Tricolor porphyry copper centers are located within a north-south-elongated hydrothermal alteration zone 6x1.5 km of surface dimensions. The centers are related to tonalite to granodiorite porphyry stocks displaying potassic alteration, which are surrounded by Lower Cretaceous andesitic volcanic rocks with sericitic, kaolinite-illite and propylitic alteration zones. The western boundary of the alteration zone is marked by the post-mineralization Cachiyuyo Batholith of granodioritic to dioritic composition. U-Pb zircon ages for the Dos Amigos porphyry are of 106.1±3.5 and 104.0±3. 39 Ar data establish a minimum Late Cretaceous age for this activity. A fission track age of 59.8±9.8 Ma of apatite from the Dos Amigos porphyry indicates cooling through the temperature range of the apatite partial annealing zone (~125-60°C) during the Paleocene; and an (U-Th)/He age of 44.7±3.7 Ma of apatite from the same porphyry sample shows cooling through the temperature range of the apatite He partial retention zone (~85-40°C) during the Eocene. These ages correspond to the exhumation of the porphyry, and the latter provides a maximum age for the supergene enrichment processes that formed the chalcocite blanket currently mined at Dos Amigos.Keywords: Porphyry copper, Andes, Chile, Geochronology, Thermochronology, Coastal Cordillera. 145 Maksaev et al./ Andean Geology 37 (1): 144-176, 2010 resuMen. Determinaciones geocronológicas y termocronológicas para la mineralización de cobre porfídico en la zona de alteración de Domeyko, norte de Chile. En Domeyko, a 40 km al sur de la ciudad de Vallenar, en el norte de Chile (28°57'S-70°53'O), se ubican los pórfidos cupríferos Dos Amigos y Tricolor dentro de una zona de alteración hidrotermal elongada en sentido norte-sur de 6x1,5 km. Estos están relacionados con stocks porfídicos tonalíticos a granodioríticos con alteración potásica, rodeados por zonas de alteraciones sericítica, caolinita-illita y propilítica, las cuales afectaron principalmente rocas volcánicas del Cretácico Inferior. El límite oeste de la zona de alteración lo constituye el Batolito Cachiyuyo postmineral de composición granodiorítica a diorítica. Edades U-Pb en circón para el pórfido Dos Amigos son de 106,1±3,5 Ma y 104,0±3,5 Ma y de 108,5±3,4 Ma para el pórfido Tricolor. El Batolito Cachiyuyo adyacente dio edades U-Pb en circón de 99,6±1,9 y 99,1±1,9 Ma y edades 40 Ar/ 39 Ar en biotita de 96,9±3,9 y 94,8±0,9 Ma. De acuerdo a estas edades el emplazamiento del batolito fue posterior a los pórfidos Dos Amigos y Tricolor, consistente con las relaciones geológicas. Aunque la mineralización de cobre está relacionada espacialmente y genéticamente con los stocks porfídicos del Cretácico Inferior (Albiano), la mayoría de las micas datadas Ar establecen con certeza una edad mínima Cretácico Tardío para ella. Una edad de trazas de fisión en apatita de 59,8±9,8 Ma para el pórfido Dos Amigos indica enfriamiento a través del ...

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Magmatic features of iron ores of the Kiruna type in Chile and Sweden; ore textures and magnetite geochemistry

Cited by 267 publications

References 19 publications

Vanadium bioavailability in soils amended with blast furnace slag

Vanadium bioavailability in soils amended with blast furnace slag

Multiple Stage Ore Formation in the Chadormalu Iron Deposit, Bafq Metallogenic Province, Central Iran: Evidence from BSE Imaging and Apatite EPMA and LA-ICP-MS U-Pb Geochronology

Determinaciones geocronológicas y termocronológicas para la mineralización de cobre porfídico en la zona de alteración de Domeyko, norte de Chile.

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