THE EFFECT OF WEATHERING ON THE GEOCHEMISTRY AND MINERALOGY OF THE DEHNO GRANITES (NORTHEAST OF ALIGUDARZ)

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MOHAMMADY A.S.; KHALILI M.; MANSOURI ESFAHANI M.

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2011 | Volume:18 | Issue:4 Page(s): 601-614

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Title

THE EFFECT OF WEATHERING ON THE GEOCHEMISTRY AND MINERALOGY OF THE DEHNO GRANITES (NORTHEAST OF ALIGUDARZ)

Author(s)

MOHAMMADY A.S. | KHALILI M. | MANSOURI ESFAHANI M. | Issue Writer Certificate

Keywords

WEATHERING PROFILEQ3

GEOCHEMISTRYQ2

RARE EARTH ELEMENTSQ2

DEHNO GRANITEQ3

ALIGUDARZQ2

Abstract

The DEHNO GRANITEs are located 20 Km northeast of ALIGUDARZ. They are one of the four separated plutonic masses, exposed in the Sanandaj – Sirjan Zone. These rocks are composed of granodiorite and tonalite covered by granite arens. The main minerals of these rocks are quartz, plagioclase, biotite, muscovite and accessory minerals such as sphene, apatite, epidote, zircon, rutile and opaques. By using equation of change percentage (%change= [(RW-RP)/RP] 100), the changes of the elements content in the weathered and fresh rocks were determined and compared. According to this equation, the Si, Al, Na, K, P, Ba, Rb, Zr, Ta, Fe3+, Nb, Y and U concentrations are decreased whereas Mg is increased. Fe2+, Sr and Ca show various trends in the weathered samples compare to the parent rocks. The elements such as Hf, Y and Ta display the least changes in different depths. The chondrite – normalized REE's show decreasing trend indicating that the LREE's content in comparison to HREE's are enriched and concentrated in the weathering products rather than in fresh rocks. This may be due to surface absorption of clay minerals. In the weathered samples, Eu and Ce show depletion and slightly positive anomaly respectively. Depletion in Eu is likely caused by alteration of feldspars.

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APA: Copy

MOHAMMADY, A.S., KHALILI, M., & MANSOURI ESFAHANI, M.. (2011). THE EFFECT OF WEATHERING ON THE GEOCHEMISTRY AND MINERALOGY OF THE DEHNO GRANITES (NORTHEAST OF ALIGUDARZ). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 18(4), 601-614. SID. https://sid.ir/paper/3750/en

Vancouver: Copy

MOHAMMADY A.S., KHALILI M., MANSOURI ESFAHANI M.. THE EFFECT OF WEATHERING ON THE GEOCHEMISTRY AND MINERALOGY OF THE DEHNO GRANITES (NORTHEAST OF ALIGUDARZ). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2011;18(4):601-614. Available from: https://sid.ir/paper/3750/en

IEEE: Copy

A.S. MOHAMMADY, M. KHALILI, and M. MANSOURI ESFAHANI, “THE EFFECT OF WEATHERING ON THE GEOCHEMISTRY AND MINERALOGY OF THE DEHNO GRANITES (NORTHEAST OF ALIGUDARZ),” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 18, no. 4, pp. 601–614, 2011, [Online]. Available: https://sid.ir/paper/3750/en

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