عنوان

بررسی زمین شناسی اقتصادی پتانسیل های منگنز خراسانک، جنوب و جنوب غرب هشترود

‭۵۹۹۶پ‬

per

بررسی زمین شناسی اقتصادی پتانسیل های منگنز خراسانک، جنوب و جنوب غرب هشترود

/وارطان سیمونز

: علوم طبیعی

‮‭۱۳۹‬ص‬

چاپی

کارشناسی ارشد

زمین شناسی اقتصادی

‮‭۱۳۸۱/۰۶/۲۶‬

تبریز

The purpose of this thesis is to study geology and genesis of manganese ores in the south and southwest of Hashtroud, eastern Azerbaijan. In this regard, 3 main areas in the south and southwest of Hashtroud city, have been studied. The first area is Khorasanak station, which is located on the Tehran-Tabriz railway. This area is covered by Miocene volcanic rocks in the western part, and by Miocene marls, siltstones and limestones in the eastern zone. Bands of manganese oxide in these marls and limestones are common; the thichness of these bands vary from 1 to 20 centimeteres. These bands consist of pyrolusite and psylomelane and they also include veinlets of jasper and barite.The second area is Idalu-Jokandy, 37 kms southwest of Hastroud. In this area the first geologic formation is Jorasic shale and sandstone. Miocene conglomerates and pyroclastic rocks of Sahand volcano sedimentary complex cover extensive part of this area. The youngest formation in this area is hotspring limestone and marble; within these limestones, there are a lot of bands, lenses and patches of manganese and iron oxides. These oxides are also precipitated by hot springs. The main ore mineral in this area is pyrolusite, accompanied by some psylomelane and limonite. The third area is Zarashlu-Khalifeh Kamal, 47 kms southwest of Hashtroud. Extensive part of this area is covered by Miocene trachyandesite and basaltic andesite rocks, which contain manganese ores. The second formation is Miocene conglomerates, sandstones and mollases, and intruded by volcanic dome; it's composition is olivine basalt and it's pick is Cheragh Mardan with 2800 meters of height.Manganese ore occurs as vertical veins, which fills previous fractures and faults. The ore bearing fluids migrated through these faults and filled them. The main ore mineral of these veins is pyrolusite with some psylomelane and veinlets of barite.Petrographically, the main minerals of the volcanic rocks are plagioclase (albite-oligoclase), pyroxene (aujite, ejerine), amphybole (oxyhornblend) and opace minerals (hematite). The texture of these rocks is microlithic purphyry and hialopurphyry. Petrologically, the composition of Khorasanak volcanic rocks is andesite-dacite and they have calc alkaline nature.As mentioned earlier, the main ore mineral in these areas is pyrolusite which shows crustification and colloform texture. Also there is some psylomelane as aciccular aggregates with colloform texture.The main gange minerals of this region are silica (jasper), barite and travertine.Geochemical analysis show that these ores have hydrothermal origin and precipitated by hot springs which was during Quaternary and even recently there is some evidence of activity. At the end, more studies and researches on the continuity of the ores in other areas of the region are suggested.

سیمونز، وارطان

ملک قاسمی، فرهاد، استادراهنما

کریم زاده ثمرین، علیرضا، استادمشاور

مؤذن، محسن، استادمشاور

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