نتایج جستجو برای: alkaline volcanic
تعداد نتایج: 57247 فیلتر نتایج به سال:
Introduction Conclusions References
Cretaceous volcano-sedimentary basins and successions in the Korean Peninsula are located along NE-SW- NNE-SSW-trending sinistral strike–slip fault systems. Soft-sediment deformation structures (SSDS) of lacustrine sedimentary strata occur Wido, Buan, Haenam areas southwestern Peninsula. In this study, systematic geological, geochronological, geochemical investigations volcanic-sedimentary were...
The study area is located in northwest of Isfahan, 25 km northwest of Daran. Buin-Miandasht intrusive rocks consist of granite and granodiorite. Based on geochemical diagrams, these granitoids are I -type calc-alkaline and evolved in volcanic arc environments. The Buin-Miandasht intruded into the metamorphic basement (Paleozoic?) and a small skarn and hornfels occurred along its contact. Based ...
Tertiary volcanic rocks including andesite, trachydacite and rhyodacite with pyroclastic rocks cropped out in east of Sarbisheh at Southern Khorasan. The main minerals in andesites are plagioclase, pyroxene, amphibole and biotite and for acidic rocks include plagioclase, quartz, sanidine, amphibole and biotite. On the basis of microprobe analyses, the composition of plagioclases in andesites r...
More than 20 tonalitic to granodioritic plutons with Oligo-Miocene age had intruded the Eocene volcanic rocks, in south-east of Urumieh- Dokhtar magmatic belt, north-west of Shahre-Babak. These rocks show granoporphyritic texture and consist of phenocrysts of plagioclases (An21-An44), with normal to reverse zoning, magnesio hornblende and tshermakite and biotites. The matrix consists of fine-gr...
West and southwest of Razan igneous rocks are located in the Hamedan Province in the Sanandaj- Sirjan zone, west Iran. According to petrography and chemical studies, these rock bodies are composed of diorite, gabbrodiorite, monzonite, quartz- monzonite, andesite and andesibasalt. The results of geochemical analysis show that these rocks belong to a cal- alkaline magma series. The geochemical c...
Abstract Alkaline magmatic systems formed in intraplate settings have a low Au endowment, contrasting with the high fertility of alkaline arc and rift settings, which host numerous Au-rich porphyries Cu-Au Au-Ag epithermal deposits. Among other factors, system is determined by concentration ore-forming magma, strongly controlled amount chemistry sulfides that fractionated during magma different...
The study area is located in the western portion of Isfahan, in Shahrekord-Dehsard Terrene. This area is part of the Sanandaj- Sirjan structural Zone. In this area, metamorphosed igneous outcrops contain greenschist and metabasite rocks. These rocks have metamorphed into greenschist facies and belong to the Triassic-Jurassic age. The etabasite is mainly composed of plagioclase, amphibole, epido...
Hezar complex is a part of Dehaj-Sarduiyeh volcano-plotunic belt in southwest of Rayen (Kerman province). Investigations on lava flows show that they have basalt, basaltic-trachy-andesite, trachy-andesite ,and trachy-basalt composition. On the basis of petrographic studies, the rocks contain plagioclase (Oligoclase - Andesine), pyroxene (Augite - Diopside) and much altered olivine. Plagioclases...
Granitoid bodies of south of Damghan with northeast- southwest trend have intruded into the Eocene volcanic,volcanoclastic and Cretaceous carbonate deposits. Recent studies have revealed that the Al content of hornblende in calc-alkaline granitoids varies linearly with pressure of crystallization , thereby providing a mean of determining depth of pluton emplacement . Based on results of el...
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