نتایج جستجو برای: metasomatized mantle
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The northeast region of Birjand is located in Lut structural and geological province. In this area we can distinguish two separate volcanic rock groups: intermediate to acidic volcanic rocks, including dacite, andesite, rhyolite and trachyandesite; and basic rocks, including basaltic andesite, mugearite and basalt. In this region, intermediate to acidic rocks, which belong to the Eocene-Miocene...
about 50 Km northwest of Bardeskan, Eocene volcanic and volcano sedimentary rocks of magmatic belt of north central Iran structural zone are host of Abri copper deposit. Volcanic rocks dominantly have andesitic, basalt and andesitic basalt composition, and manifested such as submarine lava flows, brecciated lavas in the present of water (agglomerate), or ash and fragmented volcanic rocks (tuffi...
The Mashhad ultramafic complex with a Permo-Triassic stratigraphic age is exposed at the NE of Binaloud Mountain and the SW to NW of Mashhad city. This area is mainly composed of mafic and ultramafic rocks, metamorphosed carbonate and pelitic rocks and granitoids in a NW- SE trend. Serpentinized amphibole-peridotites are the main types of ultramafic rocks in this area. Minerals in these rocks i...
The volcanic rocks of Shah Soltan Ali area are located about 85 km southwest of the Birjand city at the eastern margin of the Lut block. Petrographic studies indicate that volcanic rocks consist of basalt to andesite. The main minerals are plagioclase, pyroxene and hornblende. Biotite and olivine observed rarely. The minor minerals are apatite and zircon. volcanic rocks show weak to strong pro...
Late Neoproterozoic Majerad basementic igneous - metamorphic complex with NE-SW trend located in the 150 Km southeast Shahrood and north edge of the central Iran structural zone. Same as the other basementic complex of southeast of Shahroud, in the north of Majerad pass, this complex crosscut by several small scale gabrrodioritic intrusions and numerous diabasic dikes. In these gabrodiorite int...
The Oligocene-Miocene granitic rocks of Deh Siahan, part of central Iranian volcanic belt, are intruded into Eocene volcano-sedimentary complex where their contact is marked by albite-epidote hornblende hornfels facies and granitic apophyses. The granitic rocks show enhanced LIL element abundances and low HFS/LIL ratios. Geochemical data, various trace element discriminant diagrams, enhanced Y/...
Kersantite is the international designation for hypabyssal lamprophyres essentially made up of dark micas and plagioclase. Kersantites from type locality (Kersanton hamlet) W-Armorican surrounding area are Serpukhovian/Bashkirian in age. They systematically associated field with microgranodiorites, both types being intruded synchronously as syn-compressional magmatic bodies that postdated pre-t...
In the Tethyan realm, leucocratic rocks were recognized as dikes and layers outcropping in ophiolitic of Western Alps, Corsica, Northern Apennines. Several authors have suggested that origin is associated with partial melting cumulate gabbro. Major trace elements composition paragenesis provided information about genetic processes. This research aims at disclosing, for first time, petrographica...
Abstract A plausible origin of the seismically observed mid-lithospheric discontinuity (MLD) in subcontinental lithosphere is mantle metasomatism. The metasomatized likely to stabilize hydrous phases such as amphiboles. existing electrical conductivity data on amphiboles vary significantly. hornblendite much higher than that tremolite. Thus, if truly represents amphibole varieties MLD regions, ...
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