Z. Gharehchahi; M. Moayyed; J. Ahmadiyan; M. Murata
Abstract
Sungun and Haftcheshme mines located in Arasbaran volcano-plutonic complex in the North West of Azarbaijan province. lamprophyric dikes of Sungun with younger age Oligo-Miocene including minerals, biotite, plagioclase and pyroxene, porphyritic texture, classified part of the calc-alkaline and kersantite ...
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Sungun and Haftcheshme mines located in Arasbaran volcano-plutonic complex in the North West of Azarbaijan province. lamprophyric dikes of Sungun with younger age Oligo-Miocene including minerals, biotite, plagioclase and pyroxene, porphyritic texture, classified part of the calc-alkaline and kersantite and The area lamprophyric rocks are intruded in to Sungun quartz - monzonite. lamprophyric dikes of haftcheshme with with younger age Oligo-Miocene including minerals, biotite, alkali feldspar and pyroxene, the main textures microlitic porphyy and flow, Calc-alkaline Lamprophyre component - are classified minette and The area lamprophyric rocks are intruded in to Haftcheshme quartz - diorite. The behavior of trace elements studied by the means of spider diagrams show low enrichment of LREE relative to MREE and HREE. Review geochemical characteristics of the study show that the origin of mantle-derived magmas essentially lamprophyres. The lamprophyric rocks are generated from calc-alkaline lamprophyrecomponent, related to magmatic arc tectonic setting and these lamprophyres have gneated from lamprophyre low degree of partial melting of garnet lherzolite.
J. Ahmadian; M . H. Emami; M. R . Ghorbani; M . Murata
Abstract
Kal-e Kafi granitoid complex is a part of Central Iranian structural zone called Yazd block. This complex is composed of a wide spectrum of plutonic rocks ranging from gabbro to alkalike granite with age range of Upper Eocene-Lower Oligocene. Potassic granitoid shows geochemical ...
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Kal-e Kafi granitoid complex is a part of Central Iranian structural zone called Yazd block. This complex is composed of a wide spectrum of plutonic rocks ranging from gabbro to alkalike granite with age range of Upper Eocene-Lower Oligocene. Potassic granitoid shows geochemical and mineralogical characteristics distinct from other plutonic rocks in the complex. The potassic granitoids are peralkaline and ferroan while other plutonic rocks in the complex are alkaline to calc-alkaline and magnesian. With respect to REE abundances and patterns, the potassic rocks of the complex are different from other Kal-e Kafi granitoids. Low REE abundances of the potassic granitoids indicate that the rocks could not be related to other plutonic bodies through magmatic differentiation. This would probably demonstrate that different petrogenetic processes were involved in petrogenesis of the potassic granitoids. The potassic granitoids are likely to be the consequence of crustal partial melting.