Uranium–lead ages of apatite from iron oxide ores of the Bafq District, East-Central Iran

Stosch, H.-G.; Romer, Rolf L.; Daliran, Farahnaz; Rhede, Dieter

doi:10.1007/s00126-010-0309-4

Cited by 85 publications

(45 citation statements)

References 30 publications

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“…The Bafq district iron oxide ores are locally associated with REE-rich apatite ± silicate ± carbonate assemblages [34]. The timing of ore formation at Choghart has been constrained to be 515 ± 21 Ma and 529 ± 21 Ma (monazite Th-U-Pb total method; [35]).…”

Section: Previous Geochronologymentioning

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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Section: Previous Geochronologymentioning

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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“…The Posht-e-Badam Block is located between the western Yazd Block and the central Tabas Block, and together with the Lut Block further to the east, these blocks form the CIZ's crustal domain. This major metallogenic province hosts abundant iron oxide -apatite deposits (≈2 Gt of ore distributed across 34 deposits) and an important lead-zinc SEDEX mineralized zone [47,48]. The Posht-e-Badam Block is hosted by the Precambrian basement of the Iran Plate, and has later been covered by Lower Cambrian to Mesozoic rocks [49].…”

Section: Regional Geologymentioning

confidence: 99%

“…1) developed along the Proto-Tethyan margin of the Gondwanan supercontinent [45,[53][54][55]. Some authors have reported geological features, predominantly bimodal alkaline volcanism, suggestive of an extensional back-arc regime in the eastern portion of the area [47,48,56].…”

Section: Regional Geologymentioning

confidence: 99%

Identification of mineralized zones in the Zardu area, Kushk SEDEX deposit (Central Iran), based on geological and multifractal modeling

et al. 2016

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Abstract:The aim of this paper is to delineate the different lead-zinc mineralized zones in the Zardu area of the Kushk zinc-lead stratabound SEDEX deposit, Central Iran, through concentration-volume (C-V) modeling of geological and lithogeochemical drillcore data. The geological model demonstrated that the massive sulfide and pyrite+dolomite ore types as main rock types hosting mineralization. The C-V fractal modeling used lead, zinc and iron geochemical data to outline four types of mineralized zones, which were then compared to the mineralized rock types identified in the geological model. 'Enriched' mineralized zones contain lead and zinc values higher than 6.93% and 19.95%, respectively, with iron values lower than 12.02%. Areas where lead and zinc values were higher than 1.58% and 5.88%, respectively, and iron grades lower than 22% are labelled "high-grade" mineralized zones, and these zones are linked to massive sulfide and pyrite+dolomite lithologies of the geological model. Weakly mineralized zones, labelled 'low-grade' in the C-V model have 0-0.63% lead, 0-3.16% zinc and > 30.19% iron, and are correlated to those lithological units labeled as gangue in the geological model, including shales and dolomites, pyritized dolomites. Finally, a log-ratio matrix was employed to validate the results obtained and check correlations between the geological and fractal modeling. Using this method, a high overall accuracy (OA) was confirmed for the correlation between the enriched and highgrade mineralized zones and two lithological units -the massive sulfide and pyrite+dolomite ore types.

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“…The first generation includes coarse grained euhedral crystals, and the second generation is made up of fine-grained crystals that are present in the Fe ore matrix. Usually coarse-grained crystals contain inclusions of REE minerals such as monazite, bastnasite, xenotime, and alanite (Kryvdik and Mykhaylov 2001;Jami 2005;Torab and Lehman 2008;Torab 2010;Stosch et al 2011;Bumeri 2013). Apatite crystals from the PBB are fluorine-rich and rather low in chlorine (Jami 2005;Stosch et al 2011); this is common for apatite from felsic to intermediate (as well as other) magmatic rocks and independent of their relation to ore systems (Piccoli and Candela 2002).…”

Section: Rees Mineralizationmentioning

confidence: 99%

“…Usually coarse-grained crystals contain inclusions of REE minerals such as monazite, bastnasite, xenotime, and alanite (Kryvdik and Mykhaylov 2001;Jami 2005;Torab and Lehman 2008;Torab 2010;Stosch et al 2011;Bumeri 2013). Apatite crystals from the PBB are fluorine-rich and rather low in chlorine (Jami 2005;Stosch et al 2011); this is common for apatite from felsic to intermediate (as well as other) magmatic rocks and independent of their relation to ore systems (Piccoli and Candela 2002). REE mineralization in the PBB is related to the IOA deposits (Abedian 1983;Darvish Zadeh 1983;Daliran 1990;Samani and Babakhani 1990;Samani 1998Samani , 1999Kryvdik and Mykhaylov 2001;Rahmani and Mokhtari 2002;Jami 2005;Mokhtari and Emami 2008;Torab and Lehman 2008;Torab 2010;Bumeri 2013;Mokhtari et al 2013).…”

Section: Rees Mineralizationmentioning

confidence: 99%

Posht-e-Badam Metallogenic Block (Central Iran): A suitable zone for REE mineralization

Mokhtari¹

2015

Central European Geology

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One of the most important ores for REE mineralization are iron oxide-apatite (IOA) deposits. The Posht-e-Badam Block (PBB) is a part of the Central Iranian geostructural zone which is the host of most important Fe deposits of Iran. Exploration studies of the IOA deposits within the PBB (e.g. Esphordi, Gazestan, Zarigan, Lak-e-Siah, Sechahoun, Chahgaz, Mishdovan, Cheshmeh Firouzi and Shekarab) demonstrate that these deposits contain high contents of REE. Concentrations of ∑REE in the most important IOA deposits of the PBB include the following: the Esphordi deposit varies between 1.2 and 1.88%, the Gazestan deposit between 0.17 and 1.57%, the Zarigan deposit between 0.5 and 1.2% and the Lak-e-Siah deposit varies between 0.45 and 1.36%. Concentrations of ∑REE within the apatite crystals present within the IOA ores in the Esphordi, Lak-e-Siah and Homeijan deposits have ranges between 1.9-2.54%, 1.9-2.16% and of 2.55%, respectively. These elements are mainly concentrated in apatite crystals, but other minerals such as monazite, xenotime, bastnasite, urtite, alanite, thorite, parisite-synchysite and britholite have been recognized as hosts of REEs, as small inclusions within the apatite crystals, and in subsequent carbonate, hematite-carbonate and quartz veins and veinlets. Given the extent of this block and the presence of several IOA deposits within this block, and also the high grades of REEs within these deposits, one can reasonably state that it is obvious that there are significant resources of REEs in this part of Iran.

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Uranium–lead ages of apatite from iron oxide ores of the Bafq District, East-Central Iran

Cited by 85 publications

References 30 publications

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

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

Identification of mineralized zones in the Zardu area, Kushk SEDEX deposit (Central Iran), based on geological and multifractal modeling

Posht-e-Badam Metallogenic Block (Central Iran): A suitable zone for REE mineralization

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