M. Sadeghian; H. Ghasemi; Z. Farsi
Abstract
Chah Salar granitoidic pluton is located in the N of Chah-Salar village, SW of Neishabour, in the northern margin of structural Central Iran zone. This pluton intruded in Sabzevar ophiolitic Zone and based on the field observations, petrographical and geochemical classification diagrams, its lithological ...
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Chah Salar granitoidic pluton is located in the N of Chah-Salar village, SW of Neishabour, in the northern margin of structural Central Iran zone. This pluton intruded in Sabzevar ophiolitic Zone and based on the field observations, petrographical and geochemical classification diagrams, its lithological composition composed of diorite, quartzdiorite, granodiorite and alkali feldspar granite. Alkali feldspar granites as a much fractionated end-members of this rock association are intruded in this pluton in the form of dikes or apophyse shapes. Granitic pegmatites and their associated quartzolites are the most differentiated end-member of this rock association. Their subvolcanic equivalents such as pyroxene-bearing andesite, andesite, trachyandesite and dacite cut this pluton in the forms of dikes or domes. The studied rocks show variety of textures including granular, myrmekitic, graphic, porphyritic, microlitic porphyry and pilotaxitic. Except alkali feldspar granites which are highly fractionated, the other lithological compositions, on the variations diagrams of major, trace and rare earth elements versus SiO2 or differentiation index show continuous compositional variations. This pluton has calc-alkaline and metaluminous nature and belongs to I-type granitoids. Also tectonic setting discrimination diagrams indicate that the Chah Salar granitoidic pluton belongs to volcanic arc granitoids (VAG) and continental arc granitoids (CAG). Detailed investigations of field geology, petrography and geochemical characteristics indicate that magma-forming of this pluton is resulted from partial melting of subducted oceanic slab (metabasite) or metasomatized mantle wedge and then evolved by fractional crystallization, magma contamination or magma mixing.
A. Kangi; A. Rastgou; F. Ebrahimi; N. Kangi
Abstract
Shadyakh, commonly deemed as the headquarters of NeishabourCity, has so far endured such various events as war, earthquake, and other natural disasters. What has been revealed through recent archeological excavations convincingly depicts a brilliant scientific, cultural, and political manifestation of ...
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Shadyakh, commonly deemed as the headquarters of NeishabourCity, has so far endured such various events as war, earthquake, and other natural disasters. What has been revealed through recent archeological excavations convincingly depicts a brilliant scientific, cultural, and political manifestation of this city in a glorious epoch between 9th to 12th centuries, which must have continued till 1205. Notwithstanding, owing to an unanticipated occurrence, the city was thoroughly devastated. The history of devastating events along with archeological evidence discovered recently indicates that the annihilation of Shadyakh has been an upshot of Genghis Khan's holocaust.