The Role of Chlorine in the Formation of Magnetite Skarns

Purtov, V. K.; Kholodnov, V. V.; Anfilogov, V. N.; Nechkin, G. S.

doi:10.1080/00206818909465861

Cited by 18 publications

(4 citation statements)

References 3 publications

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“…In the North Aït Ahmane black smoker system, iron was leached out from the host serpentinites by the hydrothermal fluid and transported as Fe–Cl complexes up to the cracks, where it precipitated in the form of iron oxide 18 – 20 , 41 – 43 . Hence, the large amount of oxygen required to precipitate magnetite (Fe 3 O 4 ) as massive veins directly stems from the seawater-derived hydrothermal fluid circulating in the system.…”

Section: Resultsmentioning

confidence: 99%

Fossil black smoker yields oxygen isotopic composition of Neoproterozoic seawater

et al. 2018

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The evolution of the seawater oxygen isotopic composition (δ18O) through geological time remains controversial. Yet, the past δ18Oseawater is key to assess past seawater temperatures, providing insights into past climate change and life evolution. Here we provide a new and unprecedentedly precise δ18O value of −1.33 ± 0.98‰ for the Neoproterozoic bottom seawater supporting a constant oxygen isotope composition through time. We demonstrate that the Aït Ahmane ultramafic unit of the ca. 760 Ma Bou Azzer ophiolite (Morocco) host a fossil black smoker-type hydrothermal system. In this system we analyzed an untapped archive for the ocean oxygen isotopic composition consisting in pure magnetite veins directly precipitated from a Neoproterozoic seawater-derived fluid. Our results suggest that, while δ18Oseawater and submarine hydrothermal processes were likely similar to present day, Neoproterozoic oceans were 15–30 °C warmer on the eve of the Sturtian glaciation and the major life diversification that followed.

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Section: Resultsmentioning

confidence: 99%

Fossil black smoker yields oxygen isotopic composition of Neoproterozoic seawater

et al. 2018

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“…In this case, the fluid‐rock ratio, as well as the physico‐chemical properties of the fluid, could also play a key role in the spinel alteration. Particularly, the fluid redox state (oxidizing conditions favoring trivalent cations mobility), its pH (acidic pH promoting transition metals mobility) but also anionic ligands availability (the latter allowing transition metals mobility as well) have to be considered (Holser & Schneer, 1961; Kalczynski & Gates, 2014; Purtov et al., 1989). Significant spinel alteration (major to complete obliteration of the primary spinel by Cr‐magnetite and ferritchromite), associated to evidence of low metamorphic conditions (e.g., T < 350°C), likely constitutes a good indicator of significant hydrothermal activity.…”

Section: Discussionmentioning

confidence: 99%

Magnetic Properties of Ferritchromite and Cr‐Magnetite and Monitoring of Cr‐Spinels Alteration in Ultramafic and Mafic Rocks

Hodel

Macouin

Trindade

et al. 2020

Geochem Geophys Geosyst

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“…In oceanic island arcs, calcic iron skarns (CIS) are formed with iron-rich plutons intruded into volcanic wall rocks and limestone. Skarn minerals all are iron rich and generally include pyroxene and garnet, and small amount of actinolite, ilvaite and epidote (Purtov et al, 1989).Except CIS, magnesian iron skarns (MIS) that forms from ironrich plutons intruded dolomitic wall, do not contain much iron. Russian deposits have more outcrops of CIS deposits against MIS (Sokolov and Grigorev, 1977).…”

Section: Calcic Iron Skarn (Cis) Deposits Modelmentioning

confidence: 99%

A Comparative Analysis of Index Overlay and Topsis (Based on Ahp Weight) for Iron Skarn Mineral Prospectivity Mapping, a Case Study in Sarvian Area, Markazi Province, Iran

Mansouri

Feizi

Rad

et al. 2017

Bulletin of the Mineral Research and Exploration

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The aim of this research is to compare index overlay and TOPSIS (based on AHP weight) for predictive Skarn potential map. In this paper, for Calcic Iron Skarn mineralization, criteria and subcriteria introduced and ranked for generating mineral prospectivity map. The values of fi nal prospecting maps for Skarn deposit by index overlay and TOPSIS methods was specifi ed by dividing the prospectivity values into 10 classes. For better comparison, values assign to classes base on their priority in mineral exploration. The comparative analyses of index overlay and TOPSIS integration methods, has been performed by selecting four GCPs for fi eld checking. Field observation in GCP 1, 2 and 3, confi rmed Iron mineralization in the contact of intrusive bodies with sedimentary units, where the contact metamorphism was obvious but there is no observable mineralization in GCP4. Although high magnetic is distinct in mentioned GCP. Based on the fi eld checking in Sarvian area, the TOPSIS method has more accuracy compared to index overlay approach. Therefore, the TOPSIS method recommends for Calcic Iron Skarn Mineral Prospectivity Mapping in Sarvian and adjacent area.

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The Role of Chlorine in the Formation of Magnetite Skarns

Cited by 18 publications

References 3 publications

Fossil black smoker yields oxygen isotopic composition of Neoproterozoic seawater

Fossil black smoker yields oxygen isotopic composition of Neoproterozoic seawater

Magnetic Properties of Ferritchromite and Cr‐Magnetite and Monitoring of Cr‐Spinels Alteration in Ultramafic and Mafic Rocks

A Comparative Analysis of Index Overlay and Topsis (Based on Ahp Weight) for Iron Skarn Mineral Prospectivity Mapping, a Case Study in Sarvian Area, Markazi Province, Iran

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