نتایج جستجو برای: actinolite
تعداد نتایج: 166 فیلتر نتایج به سال:
Siah-Kamar hornfalses and skarns are located about 5Km east of Dehsalm and 85Km west of Nehbandan city, southeast of Birjand Province and east of Lut Block. This Skarn formed by injected Rigi granitoid (Eocene age) into limestone and sandstone (Upper Cratacious). Rigi Mountain is mainly granodiorite in composition and contains plagioclase, quartz, hornbelend and biotite minerals. Geochemistry ...
Gabbroic complex of Soltan Abad is Located about 35 Km east of Sabzevar. According to tectonic classification, the study area is part of Sabzevar ophiolitic zone. The composition of these intrusion bodies are vary from gabbro to gabbro-diorite. The main minerals of gabbroic rocks are plagioclase (bytonite), clino-pyroxene and ortho-pyroxene (enstatit – hyperestene) and accessory minerals are ap...
Mineralogical and geochemical investigations indicate two general stages of skarnification i.e, prograde and retrograde stages in the Mohammad-Abad district, south west of Yazd province. Metasomatic skarn (Prograde stage) occurred with precipitation of anhydrous calc-silicate mineral assemblages (andradite and diopside- hedenbergite) within the temperature ranges of 470 to 550 ºC. During the re...
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...
Gazestan magnetite-apatite deposit is located in Central Iran and Bafq region, which has been occurred in form of veins, veinlets, and small apatite lenses as well as magnetite in metasomatic rock types such as green chlorite-actinolite rock units. These rocks are situated in the carbonate-volcanic complex of Upper Precambrian-Lower Cambrian Rizo formation. In this study, staged factor analysis...
توده نفوذی گرانیتوئیدی خضرآباد در شمال غرب استان یزد و در کمان ماگمایی ارومیه-دختر واقع شده است. نفوذ این توده در سنگ میزبان آهکی کرتاسه (سازند تفت) باعث اسکارن سازی در هشت کوه با مجموعه کانیایی زیر شده است: garnet+clinopyroxene+epidote+tremolite-actinolite+chlorite+calcite+quartz. مطالعه همیافتی کانی ها نشان می دهد که همیافت گارنت-پیروکسن با بیشترین فراوانی پایه کانیایی اسکارن را شکل داده، گار...
The acumulative beach deposits of the western-north coast Black Sea in area from village Liman (Katran spit) to Carolino-Bugaz (Odesa region) have been studied. length coastal line study is approximately 86 km. following forms areas are widespread here: spit, spills, sloping beaches. 35 samples were taken and analyzed all types depressions by same methodology during summer period. sampling was ...
Semi-pelitic rocks ranging in grade from the prehnite–pumpellyite to the greenschist facies from southeastern Otago, New Zealand, have been investigated in order to evaluate the reactions leading to formation and breakdown of stilpnomelane. Detrital grains of mica and chlorite along with fine-grained authigenic illite and chlorite occur in lower-grade rocks with compactional fabric parallel to ...
A shallow acid assemblage of sulfur and kaolinite +/alunite, dlclate and pyrophyllite dominates the hydrothermal alteration in the seven wells in Cawayan from surface down to 0 mRL. These zones range in thickness from 20 to 220 m. Thts shallow acid zone formed at temperatures < 160°C. Below 0 mFU down to -600 mRL, a deep acid zone of dlaspore and pyrophyllite +/alunite and dlclute appear in thi...
The north-dipping Hout River Shear Zone (HRSZ), which marks the boundary between high-grade Limpopo Complex in its hanging wall and low-grade granite-greenstone terrane of Kaapvaal Craton South Africa footwall, is a deep-crustal shear zone that controlled emplacement hot granulites over against granite-greenstones during exhumation at ~2.72–2.62 Ga. This major migration large volumes hydrous fl...
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