A STUDY OF CONTROLLING FACTORS ON THE MORPHOLOGY OF GARNET CRYSTALS IN METAMORPHIC AND IGNEOUS ROCKS OF THE HAMADAN AREA

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HOSSEIN MIRZAEE ZAHRA; SEPAHI A.A.; MOAZZEN M.; HOSSEIN MIRZAEE ZOHREH; DADKHAH R.

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2011 | Volume:18 | Issue:4 Page(s): 519-530

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Title

A STUDY OF CONTROLLING FACTORS ON THE MORPHOLOGY OF GARNET CRYSTALS IN METAMORPHIC AND IGNEOUS ROCKS OF THE HAMADAN AREA

Author(s)

Keywords

GARNETQ2

SPECIAL DODECAHEDRON FORMQ3

SPECIAL TRAPEZOHEDRON FORMQ3

COMPOSITE FORMSQ3

Abstract

The study area is a part of the Sanandaj- Sirjan metamorphic belt. The Hamadan metamorphic rocks can be divided into three groups including regional metamorphic rocks, contact metamorphic rocks and migmatites. GARNET crystals are usually common in all of the metamorphic rocks (except for slates and phyllites) and in the igneous rocks (i.e. aplite, pegmatite and monzogranite). These GARNETs, from point of morphological view, can be divided into three groups: special rhombic dodecahedron form, SPECIAL TRAPEZOHEDRON FORM and COMPOSITE FORMS that made up of particular dodecahedron form, mature COMPOSITE FORMS and particular trapezohedron form. Particular dodecahedron forms are common in these rocks: GARNET amphibole schists, seldom in GARNET mica schists, rarely in mesosome of migmatites and in GARNET mica hornfelses. GARNETs in aplites and pegmatites have SPECIAL TRAPEZOHEDRON FORM. GARNET crystals in other rocks of the study area have COMPOSITE FORMS. The important factor, which is effective in changing these crystal forms, is chemical composition. With increasing of Mn/Ca and (Mn+Mg)/Ca ratio, GARNET crystal forms change from dodecahedron to trapezohedron.

Cites

MINERALOGY AND MINERAL-CHEMISTRY OF TOURMALINE AND GARNET FROM MOLATALEB VILLAGE GRANITOID (NORTH OF ALIGUDARZ) NW OF ISFAHAN

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APA: Copy

HOSSEIN MIRZAEE, ZAHRA, SEPAHI, A.A., MOAZZEN, M., HOSSEIN MIRZAEE, ZOHREH, & DADKHAH, R.. (2011). A STUDY OF CONTROLLING FACTORS ON THE MORPHOLOGY OF GARNET CRYSTALS IN METAMORPHIC AND IGNEOUS ROCKS OF THE HAMADAN AREA. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 18(4), 519-530. SID. https://sid.ir/paper/3753/en

Vancouver: Copy

HOSSEIN MIRZAEE ZAHRA, SEPAHI A.A., MOAZZEN M., HOSSEIN MIRZAEE ZOHREH, DADKHAH R.. A STUDY OF CONTROLLING FACTORS ON THE MORPHOLOGY OF GARNET CRYSTALS IN METAMORPHIC AND IGNEOUS ROCKS OF THE HAMADAN AREA. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2011;18(4):519-530. Available from: https://sid.ir/paper/3753/en

IEEE: Copy

ZAHRA HOSSEIN MIRZAEE, A.A. SEPAHI, M. MOAZZEN, ZOHREH HOSSEIN MIRZAEE, and R. DADKHAH, “A STUDY OF CONTROLLING FACTORS ON THE MORPHOLOGY OF GARNET CRYSTALS IN METAMORPHIC AND IGNEOUS ROCKS OF THE HAMADAN AREA,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 18, no. 4, pp. 519–530, 2011, [Online]. Available: https://sid.ir/paper/3753/en

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