نتایج جستجو برای: protolith
تعداد نتایج: 242 فیلتر نتایج به سال:
Geophysical observations indicate that patches of localized fracturing occur within otherwise viscous regions subduction plate boundaries. These place uncertainty on the possible down-dip extent seismogenic zone, and as a result maximum magnitude thrust earthquakes. However, processes controlling where how occurs shear zones are unclear. We examined three exposures exhumed boundary Kyushu, Japa...
The Belomorian Province of the Fennoscandian Shield exposes numerous Precambrian eclogites, which makes it significant for study early tectonic processes. age these eclogites has been discussed more than 15 years and regarded as either Archean or Paleoproterozoic. In Kuru-Vaara quarry within northern Province, eclogitic assemblage is preserved in concordant mafic boudins felsic gneisses a parti...
Delbar metamorphic complex is located in 130 Km south of Shahrood (Biarjmand area) in Northern margin of the central Iran zone. The varied metamorphic rocks including meta-psammite, meta-greywacke, meta-pelite, marble and amphibolite and mylonitized granites and leucogranites intrusions are exposed in this complex. The field and petrography evidences indicated the evolutions resulted of the inc...
The studied area is located in the west Azerbaijan Province at north-west of Serow town. Variety of metamorphic rocks including metabasites, marbles and metaperidotites crop out in the area. The metabasites are metamorphosed under greenschist to amphibolite facies. The metamorphosed calcareous rocks are mainly marble in which calcite form more than 90% volume of the rocks. The metaperidotites a...
mehredjan bentonite deposit is located ~33 km southeast of khoor in isfehan province. it includes 15 discrete outcrops and occurs as layered and massive forms within a volcano-clastic sequence. bentonitization process was accompanied with development of minerals such as montmorillonite, quartz, cristobalite, calcite, kaolinite, halite, albite, orthoclase, and muscovite. the collected field and ...
The protoliths of metamorphosed argillaceous rocks from the Garmichay area in the East Azerbaijan province of NW Iran were clay-rich sediments of reworked nature, originating most likely from an andesite to andesite-basalt source and deposited in an active continental margin tectonic setting. The protoliths of the Garmichay metapelites experienced low to moderate chemical weathering. Andalusite...
Aghadjari bauxite deposit is located in ~15km south of Shahindezh, West-Azarbaidjan province. This deposit was developed as stratiform lenses along the contact of Rutheh and Elika carbonate formations. Bauxitization processes led to the formation of boehmite, diaspore, kaolinite, pyrophyllite, illite, hematite, goethite, anatase, rutile, and quartz. Ferrugenization and deferrugenization mechani...
The Geysour area is located east of Gonabad and is a part of the northern Lut block. The rocks in this area include granitoid and metamorphic rocks. Based on field and mineralogical evidence, the protolith of amphibolite rocks are calc-silicate. The metamorphic rocks of this region are divided into metapelites and amphibolites. Textures, such as post-tectonic garnet and random amphiboles, are i...
Microstructural and petrographical features as well as field relations, show that formation of the metapelitic rocks of Bolandparchin and Poshtuk in northwestern Iran was poly-metamorphic. Mineral assemblages in the metapelites of two areas are different. The Bolandparchin schists are graphite-rich and have dark color. Peak metamorphic assemblage is garnet, biotite, staurolite, aluminosilicate ...
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