PEGMATITES CHARACTERISTICS OF SOUTH HAMADAN: SAPPHIRES GEMOLOGICAL STUDY APPROACH

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SHEIKHI GHESHLAGHI RASOL; AHMADI MOHAMMAD HADI

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Journal: GEOCHEMISTRY Year:2015 | Volume:4 | Issue:3 Page(s): 269-282

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Information Journal Paper

Title

PEGMATITES CHARACTERISTICS OF SOUTH HAMADAN: SAPPHIRES GEMOLOGICAL STUDY APPROACH

Author(s)

SHEIKHI GHESHLAGHI RASOL | AHMADI MOHAMMAD HADI | Issue Writer Certificate

Keywords

HAMEDANQ2

PEGMATITEQ2

PERALUMINOUSQ2

SAPPHIREQ2

GRANITEQ2

Abstract

Some PEGMATITEs have been found in the Sanandaj-Sirjan Zone in a region located at 5 km south of HAMEDAN. These PEGMATITEs contain SAPPHIRE, which is a precious mineral. In this study, the features and conditions of PEGMATITE formation have been presented as a key in exploration for this mineral. Based on the petrographic studies, these PEGMATITEs are mica- SAPPHIRE bearing types and were not mentioned in previous studies of Alvand PEGMATITEs. According to this study, there are genetic relationships between the igneous rocks of this region and PEGMATITEs which have been formed as a result of differentiation of magmas with mafic composition. Tectonic discriminant diagrams indicate a syncollision tectonic environment for the rocks studied. The rocks are mainly PERALUMINOUS and S-type GRANITEs, in terms of the degree of aluminum saturation, which suggests the conditions of SAPPHIRE formation. Geochemical studies suggest that SAPPHIRE has been crystallized after microcline and before quartz. The existence of muscovite, zircon and tourmaline in PEGMATITEs found in the south of HAMEDAN reflects the fact that these PEGMATITEs are profound species which is a reason for the coarseness of formed SAPPHIREs. Also, the dark color of SAPPHIRE is due to the iron content in the PEGMATITEs. In addition, Fe, Ti and Ga are also involved in the color of these gems. Gemological studies and SAPPHIRE processing tests indicate that a cut parallel to c-axis gives higher refractive index, luster intensity, color and specific gravity than a cut perpendicular to it which is especially useful in cutting these gems.

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APA: Copy

SHEIKHI GHESHLAGHI, RASOL, & AHMADI, MOHAMMAD HADI. (2015). PEGMATITES CHARACTERISTICS OF SOUTH HAMADAN: SAPPHIRES GEMOLOGICAL STUDY APPROACH. GEOCHEMISTRY, 4(3), 269-282. SID. https://sid.ir/paper/230878/en

Vancouver: Copy

SHEIKHI GHESHLAGHI RASOL, AHMADI MOHAMMAD HADI. PEGMATITES CHARACTERISTICS OF SOUTH HAMADAN: SAPPHIRES GEMOLOGICAL STUDY APPROACH. GEOCHEMISTRY[Internet]. 2015;4(3):269-282. Available from: https://sid.ir/paper/230878/en

IEEE: Copy

RASOL SHEIKHI GHESHLAGHI, and MOHAMMAD HADI AHMADI, “PEGMATITES CHARACTERISTICS OF SOUTH HAMADAN: SAPPHIRES GEMOLOGICAL STUDY APPROACH,” GEOCHEMISTRY, vol. 4, no. 3, pp. 269–282, 2015, [Online]. Available: https://sid.ir/paper/230878/en

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