Fe-Ti Oxide Minerals Geothermometry and Oxygen Fugacity at the Dar Gaz Anomaly, Kahnuj

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KARIMI SHAHRAKI BEHROUZ; Ghasemi Siani Majid; Gholizadeh Kazem

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Journal: KHARAZMI JOURNAL OF EARTH SCIENCES (JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY)) Year:2019 | Volume:5 | Issue:1 Page(s): 79-98

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Title

Fe-Ti Oxide Minerals Geothermometry and Oxygen Fugacity at the Dar Gaz Anomaly, Kahnuj

Author(s)

KARIMI SHAHRAKI BEHROUZ | Ghasemi Siani Majid | Gholizadeh Kazem | Issue Writer Certificate

Keywords

Kahnuj Ophiolitic Complex

Dar Gaz anomaly

Fe-Ti oxides

Geothermometry

Oxygen Fugacity

Abstract

In the southeast of Iran, titaniferous magnetite deposits associated with the gabbro rocks occur in Kahnuj Ophiolitic Complex. Mineraloghraphy studies have revealed the primary and secondary ore mineral consist of titanomagnetite, ilmenite, hematite, goethite, martite, pyrite, chalcopyrite, pyrrhotite and silicate minerals (plagioclase, pyroxene, hornblende, olivine, alkali feldspar). Trellis-sandwich textures and ilmenite-titanomagnetite intergrowths are resulted from oxidation of former Ti-rich magnetite at different temperatures. Chemical analyses show that the ilmenite and magnetite (titanomagnetite) contains 46. 51 to 52. 68 and 4. 00 to 19. 71 wt. % TiO2 and 1. 00 to 2. 98 and 0. 00 to 1. 74 wt. % V2O3, respectively. The ulvö spinel (Mol % Usp) (Fe2TiO4) in titanomagnetite shows a composition ranging from 4. 58 to 56. 87 wt. %, and ilmenite lamellae are varying thickness and ilmenite type 1 to 3 contain of 88. 23 to 93. 94, 93. 04 to 99. 80 and 99. 09 to 99. 73 wt. % of the ilmenite (Mol % Ilm), respectively. Compositions of intergrowth Tm-Ilm pairs (type 2) were plotted on T/fO2 diagrams. The Tm-Ilm pairs show varying degrees of re-equilibration to subsolidus temperatures (551 to 830° C) and fO2 (-21. 6 to-23. 97). The Tm-Ilm pairs from Dar Gaz cluster around the QFM buffer curve for 1. 5 kbar total pressure.

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APA: Copy

KARIMI SHAHRAKI, BEHROUZ, Ghasemi Siani, Majid, & Gholizadeh, Kazem. (2019). Fe-Ti Oxide Minerals Geothermometry and Oxygen Fugacity at the Dar Gaz Anomaly, Kahnuj. KHARAZMI JOURNAL OF EARTH SCIENCES (JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY)), 5(1 ), 79-98. SID. https://sid.ir/paper/269010/en

Vancouver: Copy

KARIMI SHAHRAKI BEHROUZ, Ghasemi Siani Majid, Gholizadeh Kazem. Fe-Ti Oxide Minerals Geothermometry and Oxygen Fugacity at the Dar Gaz Anomaly, Kahnuj. KHARAZMI JOURNAL OF EARTH SCIENCES (JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY))[Internet]. 2019;5(1 ):79-98. Available from: https://sid.ir/paper/269010/en

IEEE: Copy

BEHROUZ KARIMI SHAHRAKI, Majid Ghasemi Siani, and Kazem Gholizadeh, “Fe-Ti Oxide Minerals Geothermometry and Oxygen Fugacity at the Dar Gaz Anomaly, Kahnuj,” KHARAZMI JOURNAL OF EARTH SCIENCES (JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY)), vol. 5, no. 1 , pp. 79–98, 2019, [Online]. Available: https://sid.ir/paper/269010/en

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