CHEMICAL COMPOSITION OF MINERALS AND GENESIS OF MAFIC MICROGRANULAR ENCLAVES IN INTERMEDIATE - ACIDIC PLUTONIC ROCKS FROM KUH -E- ZAR AREA (SOUTHEAST OF SEMNAN)

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GHORBANI GHASEM

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2008 | Volume:15 | Issue:2 Page(s): 293-310

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Title

CHEMICAL COMPOSITION OF MINERALS AND GENESIS OF MAFIC MICROGRANULAR ENCLAVES IN INTERMEDIATE - ACIDIC PLUTONIC ROCKS FROM KUH -E- ZAR AREA (SOUTHEAST OF SEMNAN)

Author(s)

GHORBANI GHASEM | Issue Writer Certificate

Keywords

MAFIC MICROGRANULAR ENCLAVESQ3

CHEMISTRY OF MINERALSQ2

MAGMA MIXINGQ2

SOUTHEAST OF SEMNANQ3

Abstract

The Kuh-e- Zar area is located about 75 Km in SOUTHEAST OF SEMNAN. Electron microprobe analyses of' plagioclases of MAFIC MICROGRANULAR ENCLAVES and plutonic host rocks from Kuh-e-Zar area display that they have normal, oscillatory and reverse zoning, so that plagioclase cores of reverse zoning in enclaves have oligoclase and andesine compositions and their rims have andesine and laboradorite compositions, respectively. Investigation of biotite compositions in host rocks show that in the host granodiorite rocks, there are two types of biotites. The first type has high TiO2 (mean 4.8%), Al2O3 mean 12.84%), MgO (mean 15.38%) and low SiO2 (36.89%), which are similar to MAFIC MICROGRANULAR ENCLAVES (mean TiO2 4.67%, Al2O3 13.03%, MgO 15.19% and SiO2 37.23%). the second type is depleted in TiO2 (mean 0.04%) and MgO (mean 0.02%) and enriched in Al2O3 (mean 18.09%) and SiO2 (mean 64.5%). Contents of these elements in the biotites of host monzodiorite rocks are similar to enclaves. Chemical compositions of pyroxenes in enclaves are similar in compositions to those of host rocks. These features, in addition to the patterns and abundances of trace elements in enclaves, the presence of inclusions of fine grain biotite and hornblende in feldspares, synplutonic dykes, the nature of the plagioclase zoning and etc. display MAGMA MIXING and mingling origin for generation of these enclaves.

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APA: Copy

GHORBANI, GHASEM. (2008). CHEMICAL COMPOSITION OF MINERALS AND GENESIS OF MAFIC MICROGRANULAR ENCLAVES IN INTERMEDIATE - ACIDIC PLUTONIC ROCKS FROM KUH -E- ZAR AREA (SOUTHEAST OF SEMNAN). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 15(2), 293-310. SID. https://sid.ir/paper/3982/en

Vancouver: Copy

GHORBANI GHASEM. CHEMICAL COMPOSITION OF MINERALS AND GENESIS OF MAFIC MICROGRANULAR ENCLAVES IN INTERMEDIATE - ACIDIC PLUTONIC ROCKS FROM KUH -E- ZAR AREA (SOUTHEAST OF SEMNAN). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2008;15(2):293-310. Available from: https://sid.ir/paper/3982/en

IEEE: Copy

GHASEM GHORBANI, “CHEMICAL COMPOSITION OF MINERALS AND GENESIS OF MAFIC MICROGRANULAR ENCLAVES IN INTERMEDIATE - ACIDIC PLUTONIC ROCKS FROM KUH -E- ZAR AREA (SOUTHEAST OF SEMNAN),” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 15, no. 2, pp. 293–310, 2008, [Online]. Available: https://sid.ir/paper/3982/en

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