نتایج جستجو برای: alkaline rocks

تعداد نتایج: 64205  

Journal: :iranian journal of earth science 0
saeed saadat department of geology, mashhad branch, islamic azad university, mashhad, iran charles r. stern department of geological sciences, university of colorado, boulder, co, usa

the lut block in eastern iran is a micro-continental block within the convergent orogen between the arabian, eurasian and indian plates. large areas of the north-central, eastern, and western lut block are covered by volcanic rocks of paleogene, neogene and quaternary age.  peak volcanic activity took place in the north-central part of the lut block during the eocene, and then dramatically decr...

Ghorbani, , Khatibi, , Shafaii Moghadam, ,

The studied bodies are located in the west of Urumieyeh Lake and northeast of Oshnavieyeh, in the Sanandaj-Sirjan structural zone. Compositionaly, these bodies are formed from gabbro-diorite (Dourbeh) and granite (Nari). Gabbrodiorite rocks are composed of plagioclase (andesine to bytownite), amphibole (calcic group and magnesio-hornblende-tschermakite-hornblende type) and pyroxene (augite) as ...

Mohammadi, , Yari, , Zarrinkoub, ,

The study area is located about 105 kilometers east of Sarbisheh in Southern Khorasan and in the Sistan suture zone. The magmatic rocks of this area are exposed as intrusive and sub volcanice including diorite, quartz diorite, porphyry quartz diorite and porphyry diorite with Oligocene- Miocene age. These rocks have granular, porphyry with fine- grained matrix, ophitic, intergranular and glomer...

Journal: :زمین شناسی اقتصادی 0

the study area is located at northwest of sarbisheh in south khorasan province and eastern border of lut block. in this area, tertiary (eocene-oligocene to pliocene) volcanic rocks consisting of basaltic andesite, dacite, rhyodacite, vitreous rhyolite (perlitic in some parts), tuff and ignimbrite are exposed. in the daghar mountain, a, b and c perlite layers with thicknesses of 102, 7 and 58 me...

2012
H. H. G. J. Ulbrich J. B. Presser

The Asunci6n rift, eastem Paraguay, is a remarkable structure, first noticed by Degraft. It is a segmented, "Iazy Z", left-stepping rlft system, starting at Asunci6n, to the west, with a NW-8E direction. It then tums next into a E-W treneling middle saction, finally resuming, to the east, its inltlal NW-8E course. Its endings, at both extremes, are ill-defined. Total E-W length is about 150 Km,...

Journal: :E3S web of conferences 2021

In view of the current situation shortage alkaline aggregate and abundance weakly acidic weathered igneous rocks around Nairobi, Kenya, in order to fully improve adhesion performance asphalt rocks, this paper studies effects different anti-stripping agents separately combined on aggregates. The results show that agent can property medium rock asphalt, effect is better when combined.

جوانمردی, مژگان, داودیان دهکردی, علیرضا ,

Eocene volcanic rocks in south of Asad Abad (north-east of Koohpayeh, Isfahan Province) experienced very low-grade metamorphism (hydrothermal metamorphism), resulting in prehnite, malachite, azurite, zeolite, quartz and calcite crystallization in cavities and fractures. Chlorite (brunsvigite) and amphibole (ferro-actinolite) appear on secondary phases. Augite and labradorite are two main minera...

آلیانی, فرهاد, موکه, آرنو, میری, میرمحمد, یونسی, رضا ,

The ore bodies of Galali and Baba-Ali are two relatively important iron ore deposits in west Iran.  These ore deposits are situated in the Sanandaj-Sirjan zone. The deposits are associated with ultramafic, calc-alkaline, carbonatite and other rocks. Macroscopic observations, on the boreholes, show that one of the rare ultramafic rocks (hornblendite) appears in all various horizons parallel to m...

Ahmadi Khalaji, , Mousavi, , Sarjoughian, , Tahmasbi, , Zare Shooli, ,

The Goushe granitoid Pluton is located southeast of Boroujerd. The study area is composed of granite, granodiorite and the microgranular enclaves located in it with the granodiorite to quartzmonzodiorite combination. The microgranular enclaves presence along with evidence of the presence of the non-equilibrium textures such as dissolved margin and plagioclase zoning, sieve textures, mafic clots...

The Etive igneous complex has intruded into Dalradian and Moine meta-sedimentary rocks in Devonian. Main rock types of the complex are granodiorite, monzodiorite, monzogranite, granite and diorite. Geochemical studies show that the magmas were of high K calc-alkaline, I-type and metaluminous nature. Application of discriminant diagrams to the Etive rocks indicates a possible within-plate tecton...

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