Stratiform chromitites in the Faryab ophiolitic massif, Southern Iran

Mohamad Rahgoshay; Hadi Shafaii Moghadam

Stratiform chromitites in the Faryab ophiolitic massif, Southern Iran

Mohamad Rahgoshay^*, Hadi Shafaii Moghadam

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The Faryab ophiolitic massif, located in the extreme southernmost Iran, contains stratiform chromites in the ultramafic portion of its cumulate sequence. The stratiform chromites alternate with thick dunitic layers. Their Cr₂O₃ content varies between 42 and 44% and shows lower values compared to the disseminated chromites of the dunitic layers. Pyroxenites, websterites and wherlites cumulate layers alternate with dunites. Mg# of orthopyroxenes in websterites is higher than those in pyroxenites. Chromites in pyroxenites are relatively rich in Al₂O₃. The forsterite content of associated olivines varies between 88.5 and 90.5. The temperatures calculated from the chromite-olivine thermometer are very low, and vary from 654 to 710°C and corresponding probably to subsolidus reactions.

Original language	English
Pages (from-to)	85-89
Number of pages	5
Journal	Ofioliti
Volume	30
Issue number	2
Publication status	Published - 2005
Externally published	Yes

Keywords

Iran
Mineral chemistry
Stratiform chromite
Thermometry. Faryab

Cite this

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title = "Stratiform chromitites in the Faryab ophiolitic massif, Southern Iran",

abstract = "The Faryab ophiolitic massif, located in the extreme southernmost Iran, contains stratiform chromites in the ultramafic portion of its cumulate sequence. The stratiform chromites alternate with thick dunitic layers. Their Cr2O3 content varies between 42 and 44% and shows lower values compared to the disseminated chromites of the dunitic layers. Pyroxenites, websterites and wherlites cumulate layers alternate with dunites. Mg# of orthopyroxenes in websterites is higher than those in pyroxenites. Chromites in pyroxenites are relatively rich in Al2O3. The forsterite content of associated olivines varies between 88.5 and 90.5. The temperatures calculated from the chromite-olivine thermometer are very low, and vary from 654 to 710°C and corresponding probably to subsolidus reactions.",

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T1 - Stratiform chromitites in the Faryab ophiolitic massif, Southern Iran

AU - Rahgoshay, Mohamad

AU - Moghadam, Hadi Shafaii

PY - 2005

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N2 - The Faryab ophiolitic massif, located in the extreme southernmost Iran, contains stratiform chromites in the ultramafic portion of its cumulate sequence. The stratiform chromites alternate with thick dunitic layers. Their Cr2O3 content varies between 42 and 44% and shows lower values compared to the disseminated chromites of the dunitic layers. Pyroxenites, websterites and wherlites cumulate layers alternate with dunites. Mg# of orthopyroxenes in websterites is higher than those in pyroxenites. Chromites in pyroxenites are relatively rich in Al2O3. The forsterite content of associated olivines varies between 88.5 and 90.5. The temperatures calculated from the chromite-olivine thermometer are very low, and vary from 654 to 710°C and corresponding probably to subsolidus reactions.

AB - The Faryab ophiolitic massif, located in the extreme southernmost Iran, contains stratiform chromites in the ultramafic portion of its cumulate sequence. The stratiform chromites alternate with thick dunitic layers. Their Cr2O3 content varies between 42 and 44% and shows lower values compared to the disseminated chromites of the dunitic layers. Pyroxenites, websterites and wherlites cumulate layers alternate with dunites. Mg# of orthopyroxenes in websterites is higher than those in pyroxenites. Chromites in pyroxenites are relatively rich in Al2O3. The forsterite content of associated olivines varies between 88.5 and 90.5. The temperatures calculated from the chromite-olivine thermometer are very low, and vary from 654 to 710°C and corresponding probably to subsolidus reactions.

KW - Iran

KW - Mineral chemistry

KW - Stratiform chromite

KW - Thermometry. Faryab

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JO - Ofioliti

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IS - 2

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Stratiform chromitites in the Faryab ophiolitic massif, Southern Iran

Abstract

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