نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

بررسی سنگ شناختی، جایگاه زمین ساختی و پتانسیل کانه زایی سنگ‌های بازیک شمال کمپلکس الوند با استفاده از شیمی کانی های آمفیبول و پلاژیوکلاز

نویسندگان
عادل ساکی
میرمحمد میری
سکینه سلطانی مهر
محسن رضائی
دانشگاه شهید چمران اهواز، دانشکدۀ علوم زمین، گروه زمین‌شناسی
10.52547/gnf.6.2.321
چکیده
مجموعه آذرین الوند (جنوب غرب همدان) متشکل از توده­هایی با ترکیب اسیدی تا حد واسط و بازیک است. این توده‌ها طی فازهای مختلف ماگماتیسم در دورۀ ژوراسیک در توالی دگرگونی ناحیه­ای منطقه (فیلیت­های همدان) نفوذ کرده­اند. در بخش شمالی این کمپلکس (منطقۀ چشمه قصابان) بیرون­زدگی­هایی از هورنبلندگابرو و الیوین گابرونوریت حضور دارند. الیوین گابرونوریت­ها از کانی­های الیوین، کلینوپیروکسن، ارتوپیروکسن و پلاژیوکلاز به‌همراه مقداری آمفیبول تشکیل شده­اند. آپاتیت، مگنتیت، تیتانومگنتیت، پیریت و کالکوپیریت نیز کانی­های فرعی آنها هستند. دگرسانی­ها شامل جانشینی الیوین و پیروکسن با بولینژیت، سرپانتین و کلریت هستند. تجزیۀ شیمیایی ریزکاوندۀ الکترونی نشان می­دهد که آمفیبول­های این سنگ­ها از دو نوع پارگازیتی و منیزیوهورنبلند هستند. تغییر مقادیر اکسیدهای منیزیم، سدیم و آلومینیوم و نیز محاسبات دما- فشارسنجی به‌روش هورنبلند- پلاژیوکلاز نشان می­دهد که پارگازیت­ها در متوسط فشار و دمای 11 کیلوبار و 835 درجۀ سانتی‌گراد، در یک محیط کششی و از ذوب گوشته متاسوماتیزه در نتیجه بالاآمدگی گوشته آستنوسفری، تشکیل شده­اند. ماگمای مافیک ضمن صعود به‌سمت سطح با مواد پوسته­ای آلایش پیدا کرده است. چنین شرایطی می­تواند در یک محیط کافت (احتمالاً حوضۀ پشت کمانی) فراهم شود. بررسی روند تغییرات غلظت Fe و Ti در ترکیب پلاژیوکلازها نشان می­دهد که روند تفریق ماگمای مولد این سنگ­ها در راستای غنی‌شدگی مذاب از این عناصر معدنی نبوده است. بالا بودن فوگاسیته اکسیژن و نیز روند کند سرد شدن ماگما ، منجر به تهی‌شدن ماگما از آهن طی تبلور پلاژیوکلاز شده­است. علاوه بر این، مشتق شدن از یک منشأ تهی از آهن، می­تواند از دیگر عوامل دخیل در فقدان کانه­زایی آهن ماگمایی در الیوین گابرونوریت­های چشمه قصابان باشد.
کلیدواژه‌ها
الیوین گابرونوریت
آمفیبول گوشته­ای
آمفیبول پوسته­ای
کانه­زایی آهن
مجموعه الوند

عنوان مقاله English

Investigation of petrology, tectonic setting and ore mineralization potential of basic rocks in north of the Alvand complex using amphibole and plagioclase mineral chemistry

نویسندگان English

Adel Saki
Mirmohammad Miri
Sakineh Soltanimehr
Mohsen Rezaei
Shahid Chamran University of Ahvaz
چکیده English

The Alvand complex (Hamedan province) comprises several bodies ranging from acidic to intermediate and basic compositions intruded in the regional metamorphic sequence of the area (the Hamedan phyllites) during various magmatic episodes in Jurassic. In northern part of the complex (the Cheshmeh-Ghasaban area) there are some outcrops of hornblende gabbro and olivine gabbronorite. The olivine-gabbronorites are composed of olivine, clino- and ortho-pyroxene, plagioclase and hornblende. Apatite, magnetite, titano-magnetite, pyrite and chalcopyrite are the accessory minerals. The alterations include substitution of the olivine and pyroxene by bolingite, serpentine and chlorite. Electron microprobe analyses show that the amphiboles are of pargasite, and magnesio-hornblende. Variations of MgO, Al2O3 and Na2O and thermobarometry calculations based on amphibole and plagioclase compositions indicate that pargasites formed in average pressure and temperature of 11 kbar and 835°C, from metasomatized mantle derived melt as a result of asthenospheric mantle elevation and in extensional setting. Mafic magma contaminated with crustal material as it ascends. This situation can be provided in a rift setting (probably a back arc basin). Investigation of Fe and Ti concentration variations in the plagioclases indicates that differentiation trend of the parental magma was not consistent with concentration of these elements in the melt. High fO2 and slow cooling rate of the magma caused Fe-depletion during plagioclase crystallization. In addition, formation from a Fe-depleted source could be another factor that limited iron mineralization of the Cheshmeh-Ghasaban olivine-gabbronorite.

کلیدواژه‌ها English

Olivine gabbronorite
Amphibole chemistry
Iron mineralization potential
Alvand complex
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