MINERALOGICAL, TEXTURAL AND GEOCHEMICAL EVIDENCE TO IDENTIFY POTASSIC METASOMATISM IN KARAJ DAM SILL AND ITS INFLUENCE ON COUNTRY ROCKS

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RAZAVI M.H.; MASOUDI F.; FARAHKHAH N.

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Journal: Iranian Journal of Geology Year:2010 | Volume:4 | Issue:13 Page(s): 3-11

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Title

MINERALOGICAL, TEXTURAL AND GEOCHEMICAL EVIDENCE TO IDENTIFY POTASSIC METASOMATISM IN KARAJ DAM SILL AND ITS INFLUENCE ON COUNTRY ROCKS

Author(s)

RAZAVI M.H. | MASOUDI F. | FARAHKHAH N. | Issue Writer Certificate

Keywords

KARAJ DAM SILLQ3

METASOMATISMQ2

MYRMEKITEQ3

Abstract

At the NE of Baraghan, gabbroic to monzonitic sill, known as KARAJ DAM SILL, intruded into the tuffs. Based on field observations and microscopic studies, the sill is differentiated from margin toward the center. Plagioclase crystals sometimes show zoning, but the zoning is not present in rocks with MYRMEKITE texture from the lower part of the sill. However, twinning is preserved in unzoned crystals. MYRMEKITE is wart like type. High temperature ferromagnesian minerals are decomposed but plagioclases are mostly remained fresh. Based on whole rock XRF analyses, there are non-linear trend on Rb-SiO2 and K2O-Na2O diagrams. Based on norm calculations, Na2O values decreased and K2O values increased in samples from the contact with country rocks. It could be due to extraction of Na2O from the rocks by fluids. Such textural, mineralogical and geochemical features are evidences for low potasic METASOMATISM in lower part of KARAJ DAM SILL. Fluid had influenced on tuffs and caused kaolinitization of K-feldspar, sosuritization of plagioclase and chloritization of ferromagnesian minerals. In the other hand, fluids made chemical re-mobilization of ore minerals and accumulation of secondary copper minerals in the tuffs.

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APA: Copy

RAZAVI, M.H., MASOUDI, F., & FARAHKHAH, N.. (2010). MINERALOGICAL, TEXTURAL AND GEOCHEMICAL EVIDENCE TO IDENTIFY POTASSIC METASOMATISM IN KARAJ DAM SILL AND ITS INFLUENCE ON COUNTRY ROCKS. IRANIAN JOURNAL OF GEOLOGY, 4(13), 3-11. SID. https://sid.ir/paper/129297/en

Vancouver: Copy

RAZAVI M.H., MASOUDI F., FARAHKHAH N.. MINERALOGICAL, TEXTURAL AND GEOCHEMICAL EVIDENCE TO IDENTIFY POTASSIC METASOMATISM IN KARAJ DAM SILL AND ITS INFLUENCE ON COUNTRY ROCKS. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2010;4(13):3-11. Available from: https://sid.ir/paper/129297/en

IEEE: Copy

M.H. RAZAVI, F. MASOUDI, and N. FARAHKHAH, “MINERALOGICAL, TEXTURAL AND GEOCHEMICAL EVIDENCE TO IDENTIFY POTASSIC METASOMATISM IN KARAJ DAM SILL AND ITS INFLUENCE ON COUNTRY ROCKS,” IRANIAN JOURNAL OF GEOLOGY, vol. 4, no. 13, pp. 3–11, 2010, [Online]. Available: https://sid.ir/paper/129297/en

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