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Articles by Z. Tahmasbi
Total Records ( 4 ) for Z. Tahmasbi
  Z. Tahmasbi , M. Khalili , A. Castro and A. Ahmadi
  Microgabbrodiorite, microdiorite and less than microgranodiorite enclaves occur in the Astaneh pluton. These enclaves have I-type mineral assemblages that are broadly similar to those in the host granitoids except for the greater abundance of mafic minerals, such as amphibole. They show various features formed by magma mixing/mingling environment: abundant subrounded shape, sharp but partly diffuse contact with host granitoids, finer grain size than host granites, more mafic small enclave in large enclave, ocellar quartz, acicular apatite, poikilitic textures and pargasitic amphibole in dacitic enclave. Indeed geochemistry evidences and enclaves normalized against their host granodiorites show that magma mingling occurred.
  A. Ahmadi Khalaji , Z. Tahmasbi and R. Zarei Sahamieh
  The Boroujerd pluton is chiefly constituted of quartz-diorite, granodiorite and monzogranite. The mineral chemistry and microprobe analysis of mineral assemblages in these rocks indicate that the magma in this area has a metaluminous to slightly peraluminous composition, related to calc-alkaline, arc-type magmas and displays features typical of I-type granitoids. Also, the average pressure and temperature is estimated at 1.093 ± 0.6 k bars and 785 ± 40 in quartz-diorites, respectively. All analyzed samples have log FO2-14.1 which show this magma crystallized in high oxygen fugacity. Also, the occurrence of magnesio-hornblende and Fe2+biotite in Boroujerd rocks suggest relatively oxidized magma.
  Z. Tahmasbi , M. Khalili and A. Ahmadi-Khalaji
  The Astaneh area belongs to the Sanandaj-Sirjan Zone (SSZ) in Western Iran. The igneous rocks in this area consist of tonalite, granodiorite, monzogranite and subvolcanic rocks (rhyodacites). The mineral chemistry and microprobe analysis of mineral assemblages in these rocks indicate that the magma in this area has a metaluminous to slightly peraluminous composition, related to calc-alkaline, arc-type magmas and displays features typical of I-type granitoids. Also, the average of minimum pressure is estimated at 1.37 kbars in tonalites whereas the maximum pressure is 6.58 kbars in pargasite in dacitic enclaves. The maximum temperature is 767 °C in pargasitic amphibole crystallized in dacitic enclave whereas the minimum temperature is 650 °C in tonalite. All analyzed samples have log fO2 in the range between -13 (in dacitic enclave) to -18.3 (in tonalite ) and -15 (in tonalitic enclave), respectively, which show this magma crystallized in high fO2. The presence of phenocrysts of plagioclase (An = 80-90) together with plagioclase (An = 35-40), pargasitic amphibole in dacitic enclave and oscillatory zoned plagioclase in rhyodacites might be accounted for by a magma mixing model in the subvolcanics of Astaneh.
  I. Maghfouri-Moghadam , R. Zarei-Sahamieh , A. Ahmadi-Khalaji and Z. Tahmasbi
  The Tarbur Formation is a predominately carbonate lithostratigraphic unit that outcrops in Zagros basin, between main Zagros reverse fault and high Zagros and east of Sabzpushan faults. This Formation was studied from microbiostratigraphic point of view at four measured sections, in the north of Khorram Abad (Robat section) in the east of Khorram Abad (Chamsngar section) in the east of Shirz (Sarvestan section) and in the south east of Semirum (Balghar section). Microbiostratigraphical data mainly based on foraminifera which among them, species of Loftusia have more variety and abundance, so the species of Loftusia from the measured sections are used to determine the age of successions. It is analogous to Omphalocyclus-Loftusia assemblage zone but according to the distribution of the index species of Loftusia the age of Tarbur Formatoin is Early-Middle Maastrichtian at Sarvestan section and Middle Maastrichtian for Balgar, Robat and Chamsangar sections.
 
 
 
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