نوع مقاله: مقاله پژوهشی
نویسندگان
1 کارشناسی ارشد، پژوهشکده علوم زمین، سازمان زمینشناسی و اکتشافات معدنی کشور، تهران، ایران
2 دانشیار، پژوهشکده علوم زمین، سازمان زمینشناسی و اکتشافات معدنی کشور؛ دانشگاه آزاد اسلامی، واحد تهران شمال، تهران، ایران
3 دانشیار، پژوهشکده علوم زمین، سازمان زمینشناسی و اکتشافات معدنی کشور؛ دانشگاه آزاد اسلامی، واحد اسلامشهر، اسلامشهر، ایران
4 استادیار، گروه زمینشناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران
5 دانشیار، گروه زمین شناسی، دانشکده علوم، دانشگاه ارومیه، ارومیه، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Mesgarabad area is located in ~10 km southeast of Tehran, the Central- Alborz structural zone (CASZ) of Iran. The rock units exposed in the area consist of Eocene volcanics, volcano-sedimentary and sedimentary rocks intruded by post upper Eocene granodiorite to quartz monzo-diorite. These subvolcanic intrusive bodies show porphyroid to microgranular textures and have calc-alkaline magmatic nature. These bodies produced hydrothermal fluids causing extensive alteration zones developed along the Se-Darreh-e-Bozorg strike-slip fault. The effects of hydrothermal fluids on the entire Eocene rock units and subvolcanic intrusive bodies are remarkable. The main alterations are silicification, sericitization, chloritization, epidotizaton, actinolitization, argillization, carbonatization, and alunitization-jarositization, which provided suitable physico-chemical conditions for ore-mineralization. The penetration of subvolcanic intrusive bodies into the Eocene volcanics, volcano-sedimentary and sedimentary rocks brought about skarn mineralization and epithermal barite veins. Microscopic studies and advanced analysis showed that the principal mineral phases in the epithermal zones are magnetite, pyrite, chalcopyrite, bornite, chalcocite, barite, Cu+Sn+Fe alloy, hematite, psilomelane, jacobsite, martite, geothite, and lepidochrosite. The skarnification processes occurred at two distinct stages, (1) progressive and (2) retrogressive. The pyrometasomatic anhydrous minerals such as andradite-grossularite formed during progressive stage and the hydrous minerals like epidote, chlorite, tremolite- actinolite, calcite, quartz, pyrite, chalcopyrite and chalcocite were developed during retrogressive stage. Fluid inclusion studies on primary aqueous inclusions trapped in barite crystals revealed fluid that mixing of two fluids having different physico-chemical conditions played an important role for ore deposition.
کلیدواژه‌ها [English]
کتابنگاری
آسرتو، ر.، دلنباخ، ج.، نبوی، م. ح.، انگالن، م. و وحدتی دانشمند، ف.، 1376- نقشه زمینشناسی 1:100000 شرق تهران، سازمان زمین شناسی و اکتشافات معدنی کشور.
بلوریان، غ.، مطالعه پتروگرافی و پترولوژی سازند کرج در البرز مرکزی، پایان نامه کارشناسی ارشد، دانشگاه تربیت معلم، 158 ص.
داوری، م.، 1366- بررسی های زمین شناسی و پترولوژی سنگ های نفوذی قصر فیروزه، رساله کارشناسی ارشد پترولوژی، دانشگاه تهران.
نوروزی، م.، 1388- مطالعات زمینشناسی، آلتراسیون، کانی‌شناسی و تعیین ژنز احتمالی کانی سازی در منطقه مسگرآباد (جنوب خاور تهران)، پایان‌نامه کارشناسی ارشد، پژوهشکده علوم زمین، 198ص.
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