PETROGRAPHY AND GEOCHEMISTRY OF THE HOLOLEUCOCRATIC GRANITOIDS OF ALVAND COMPLEX (HAMADAN)

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ALIANI F.; SABURI Z.; MAANIJOU M.; SEPAHI A.A.

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Paper Information

Journal: Iranian Journal of Crystallography and Mineralogy Year:2011 | Volume:19 | Issue:1 Page(s): 131-144

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Title

PETROGRAPHY AND GEOCHEMISTRY OF THE HOLOLEUCOCRATIC GRANITOIDS OF ALVAND COMPLEX (HAMADAN)

Author(s)

ALIANI F. | SABURI Z. | MAANIJOU M. | SEPAHI A.A. | Issue Writer Certificate

Keywords

ALVANDQ2

HOLOLEUCOCRATIC GRANITOIDQ2

I- TYPEQ2

GEOCHEMISTRYQ2

CALC- ALKALINEQ2

ACTIVE CONTINENTAL MARGINQ2

Abstract

Hololeucocratic granitoids of ALVAND main granitoids crops out as veins with low thickness. They are scattered in the south and west of Hamadan with latitudes of 34o 30'- 35o00' N and longitudes of 48o00'- 48o 45' E. This granitoids, based on petrological studies, are in the ranges of leucotonalite, leucogranodiorite and leucoquartz- monzodiorite. The investigation, based on the grain size, show that HOLOLEUCOCRATIC GRANITOIDs can be divided into two groups: 1) coarse- graind and 2) fine- graind. Sharp contact between HOLOLEUCOCRATIC GRANITOIDs and ALVAND main granitoids indicate that HOLOLEUCOCRATIC GRANITOIDs are younger than main granitoids (Paleocene to Late- Paleocene). Mineralogical and geological studies show that they are I- TYPE, alkaline-calc and based on saturation degree of aluminum (ASI), they are metaluminous to slightly peraluminous. These granitoids enriched in Sr and depleted in Ba, Rb, Nb and Ti which are obvious in the spider diagrams. They are also poor in K2O, FeO, MgO and enriched in CaO, Na2O with respect to ALVAND main granitoids. These rocks show enrichment from LILE and LREE elements and are depleted from HFSE elements. These properties are an indication of subduction zones and ACTIVE CONTINENTAL MARGINs. The Rb vs. Ta + Nb, Nb vs. Y, Rb vs. SiO2 geotectonic affinity discrimination diagrams support an I- TYPE, volcanic arc environment for the HOLOLEUCOCRATIC GRANITOIDs of ALVAND Complex. With regard to geological history of this area, it can be attributed to subduction of oceanic crust of Neotethys under the Central Iran.

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References

بررسی سنگ شناسی و شیمی - کانی شناسی کمپلکس الوند (همدان)

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APA: Copy

ALIANI, F., SABURI, Z., MAANIJOU, M., & SEPAHI, A.A.. (2011). PETROGRAPHY AND GEOCHEMISTRY OF THE HOLOLEUCOCRATIC GRANITOIDS OF ALVAND COMPLEX (HAMADAN). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 19(1), 131-144. SID. https://sid.ir/paper/4015/en

Vancouver: Copy

ALIANI F., SABURI Z., MAANIJOU M., SEPAHI A.A.. PETROGRAPHY AND GEOCHEMISTRY OF THE HOLOLEUCOCRATIC GRANITOIDS OF ALVAND COMPLEX (HAMADAN). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2011;19(1):131-144. Available from: https://sid.ir/paper/4015/en

IEEE: Copy

F. ALIANI, Z. SABURI, M. MAANIJOU, and A.A. SEPAHI, “PETROGRAPHY AND GEOCHEMISTRY OF THE HOLOLEUCOCRATIC GRANITOIDS OF ALVAND COMPLEX (HAMADAN),” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 19, no. 1, pp. 131–144, 2011, [Online]. Available: https://sid.ir/paper/4015/en

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