Mineralogy and metasomatic evolution of the Mianeh iron skarn deposit, Norduz-Agarak border, NW Iran

Siahcheshm, Kamal

doi:10.1007/s12517-017-3084-z

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…epidote, chlorite, and sericite) and unhydrous (e.g. andradite, diopside, and hedenbergite) skarn minerals (Meinert et al, ; Meinert et al, ; Siahcheshm, ). At Yangla, results of this paper show that skarn minerals are dominated by garnet, diopside, and hedenbergite, and copper mineralization is closely associated with retrograde skarn alteration, which is consistent with most skarn Cu deposits (Meinert et al, ).…”

Section: Discussionmentioning

confidence: 99%

Mineralogy, Fluid Inclusion, and Hydrogen and Oxygen Isotope Studies of the Intrusion‐Related Yangla Cu Deposit in the Sanjiang Region, SW China: Implications for Metallogenesis and Deposit Type

Huang

et al. 2019

Resource Geology

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The Yangla deposit is an intrusion‐related Cu deposit in the Jinshajiang tectonic belt (eastern Sanjiang region, SW China). Despite extensive studies that have been conducted on this deposit, the relationship between the granitic magma and Cu mineralization is still unclear, and hence, the genesis is debated. To answer this question, we conducted an integrated study of mineralogy, fluid inclusions (FIs), and hydrogen and oxygen (H‐O) isotopes. Three mineralization stages were identified based on the ore textures, alteration zonation, and crosscutting relationships: (i) pre‐ore prograde skarn (stage I), with the garnet and pyroxene dominated by andradite and diopside, respectively; (ii) syn‐ore retrograde alteration (stage II), which is subdivided into the early syn‐ore stage (stage IIa) marked by retrograde hydrated mineral assemblages and significant Fe‐Cu‐Mo‐Pb‐Zn sulfide mineralization, and the late syn‐ore stage (stage IIb) featured by quartz‐calcite veins; and (iii) late supergene mineralization (stage III), which is characterized by secondary azurite and malachite. These results of mineralogy, FIs, and H‐O isotopes indicate that: (i) Cu mineralization has a close temporal, spatial, and genetic relationship with skarn alteration; (ii) the ore fluids were magmatic dominated with late‐stage meteoric water incursion; and (iii) Type‐S (halite‐bearing) and Type‐V (vapor‐rich) FIs coexisted in garnet and clinopyroxene of stage I, indicating that fluid boiling might have occurred during this stage. From stage I to stage IIa, the FI type transformed from Type‐S + Type‐V + Type‐L (liquid‐rich) to Type‐V + Type‐L with the conduct of mineralization and was accompanied by the disappearance of Type‐S, and homogenization temperature and salinity also tended to decrease dramatically, which may be caused by the deposition of skarn minerals. At stage IIa, boiling of the ore fluids still continued due to the change from lithostatic to hydrostatic pressure, which triggered the precipitation of abundant quartz‐Cu‐Mo‐Fe sulfides. Furthermore, fluid mixing between a high‐temperature magmatic fluid and a low‐temperature meteoric water might cause a considerable drop in temperature and the deposition of Cu‐bearing quartz/calcite veins during stage IIb. Hence, we consider the Yangla deposit to be of a skarn type, genetically related to the Mesozoic magmatism in the Sanjiang region.

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Section: Discussionmentioning

confidence: 99%

Mineralogy, Fluid Inclusion, and Hydrogen and Oxygen Isotope Studies of the Intrusion‐Related Yangla Cu Deposit in the Sanjiang Region, SW China: Implications for Metallogenesis and Deposit Type

Huang

et al. 2019

Resource Geology

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Section: Introductionmentioning

confidence: 99%

“…The UDMA hosts many porphyry Cu ± Mo deposits, base-metal skarn and epithermal precious metal deposits (Alirezaei et al, 2015;Siahcheshm, 2017). In the north and north-eastern parts of this belt, important skarn deposits such as Mazraeh and Anjerd Cu (Mollai, 2014), Astamal Fe-LREE (Baghban et al 2015), Gudul Fe-Cu (Somarin and Moayyed, 2002), Pahnavar Fe (Mokhtari, 2012) and Mianeh (Siahcheshm, 2017) were formed through the interaction between Upper Cretaceous limestone and metasomatic ore-bearing fluids, which were associated with hypabyssal stocks. Garnets in skarn deposits commonly display chemicalzoning patterns, which may record physicochemical conditions during garnet crystallization and/or changing fluid compositions during subsequent growth (e.g., Nakano et al, 1989, Jamtveit et al, 1993, Crowe et al, 2001.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study on the Aghbolaq (Fe, Cu) Skarn Deposit, Oshnavieh, NW Iran: Constraints on Metasomatic Fluid Evolution

Siahcheshm

Khajemohammadlo

Calagari

et al. 2021

Acta Geologica Sinica (Eng)

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The Aghbolaq skarn deposit is located in the Urumieh‐Golpayegan plutonic belt, NW Iran. The garnetite skarn (stage I) has been intensely cross‐cut by the magnetite‐garnet skarn (stage II) which were, in turn, cut and offset by the ore‐hosting quartz veins/veinlets (stage III). The predominance of andradite (Adr82.5–89.1) and its high Fe3+/Al ratio (up to 1685) apparently supports the high fO2, salinity and prevalence of magmatic/hydrothermal fluids involved, rather than meteoric waters, during the magnetite‐garnet skarn formation. Two major groups of fluid inclusions, namely aqueous (LV, LVS) and aqueous–carbonic (LVC, LLCVC), were recognized in garnet and quartz veins that, especially in growth zones and along intra‐granular trails, better display fluid inclusion assemblages (FIAs) than those in clusters. The prograde magnetite‐garnet skarn was formed by the metasomatic fluid at relatively high Th (209–374°C), under a lithostatic pressure of ∼200 bars. The retrograde mineralized quartz veins were formed at temperatures ranging from 124°C to 256°C, by dilute and less saline (2.57–11.93 wt% NaCl eq.) hydrothermal fluids under a hydrostatic pressure of ∼80 bars. The fluid evolution of the Aghbolaq skarn began with an earlier simple cooling of metasomatic fluid during the prograde stage, followed by the later influx of low salinity meteoric fluids during the retrograde stage.

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Geology, fluid inclusion, and stable isotope study of the skarn-related Pb–Zn (Cu–Fe–Sn) polymetallic deposits in the southern Great Xing’an Range, China: implications for deposit type and metallogenesis

Wang

et al. 2018

Arab J Geosci

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Mineralogy and metasomatic evolution of the Mianeh iron skarn deposit, Norduz-Agarak border, NW Iran

Cited by 4 publications

References 32 publications

Mineralogy, Fluid Inclusion, and Hydrogen and Oxygen Isotope Studies of the Intrusion‐Related Yangla Cu Deposit in the Sanjiang Region, SW China: Implications for Metallogenesis and Deposit Type

Mineralogy, Fluid Inclusion, and Hydrogen and Oxygen Isotope Studies of the Intrusion‐Related Yangla Cu Deposit in the Sanjiang Region, SW China: Implications for Metallogenesis and Deposit Type

A Preliminary Study on the Aghbolaq (Fe, Cu) Skarn Deposit, Oshnavieh, NW Iran: Constraints on Metasomatic Fluid Evolution

Geology, fluid inclusion, and stable isotope study of the skarn-related Pb–Zn (Cu–Fe–Sn) polymetallic deposits in the southern Great Xing’an Range, China: implications for deposit type and metallogenesis

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