سامانه مدیریت نشریات علمی دانشگاه دامغان

سپاهی گرو, علی اصغر, سلامی, صدیقه, معانی جو, محمد. (1399). بررسی سنگ نگاری و شیمی کانی‌ها درآپلیت-پگماتیت‌های دره سیمین (جنوب همدان). مجله زمین شیمی ایران, 28(1), 37-50. doi: 10.29252/ijcm.28.1.37
علی اصغر سپاهی گرو; صدیقه سلامی; محمد معانی جو. "بررسی سنگ نگاری و شیمی کانی‌ها درآپلیت-پگماتیت‌های دره سیمین (جنوب همدان)". مجله زمین شیمی ایران, 28, 1, 1399, 37-50. doi: 10.29252/ijcm.28.1.37
سپاهی گرو, علی اصغر, سلامی, صدیقه, معانی جو, محمد. (1399). 'بررسی سنگ نگاری و شیمی کانی‌ها درآپلیت-پگماتیت‌های دره سیمین (جنوب همدان)', مجله زمین شیمی ایران, 28(1), pp. 37-50. doi: 10.29252/ijcm.28.1.37
سپاهی گرو, علی اصغر, سلامی, صدیقه, معانی جو, محمد. بررسی سنگ نگاری و شیمی کانی‌ها درآپلیت-پگماتیت‌های دره سیمین (جنوب همدان). مجله زمین شیمی ایران, 1399; 28(1): 37-50. doi: 10.29252/ijcm.28.1.37

بررسی سنگ نگاری و شیمی کانی‌ها درآپلیت-پگماتیت‌های دره سیمین (جنوب همدان)

مجله بلورشناسی و کانی شناسی ایران
مقاله 3، دوره 28، شماره 1 - شماره پیاپی 77، فروردین 1399، صفحه 37-50    اصل مقاله (4.26 M)
نوع مقاله: مقاله پژوهشی
شناسه دیجیتال (DOI): 10.29252/ijcm.28.1.37
نویسندگان
علی اصغر سپاهی گرو* ؛ صدیقه سلامی؛ محمد معانی جو
دانشگاه بوعلی سینا
چکیده
دایک­های آپلیتی -پگماتیتی موجود در جنوب شرقی همدان، در منطقه سیمین از لبه به سمت مرکز دو منطقه بافتی ویژه دارند که به خوبی اثر پیشرفت تبلور را در این دایک­ها نشان می­دهند: 1- منطقه حاشیه با ساخت­های ناهمسان شامل واحدهای دانه­ریز، هم رشدی گرافیکی و ساخت­های انجماد یک جهته و 2- منطقه داخلی با ساخت­های توده­ای و درشت بلور. تجزیه­­های ریزپردازشی برای کانی­های تورمالین، پلاژیوکلاز و فلدسپار پتاسیم انجام شد. تورمالین­ها دارای ترکیب شورلیت هستند. در نمودار FeO/(FeO+MgO) نسبت به MgO که خاستگاه تورمالین­ها را مشخص می­کند، تورمالین­های مورد بررسی دارای Fe# بین 8/0 تا 1 هستند که نشان دهنده­ی تشکیل آنها در یک سیستم ماگمایی و دخالت نداشتن سیال­های خارجی در تشکیل آنها­ست. ترکیب پلاژیوکلازهای مورد بررسی  غنی از آلبیت (Ab90-100) بوده و فلدسپارهای پتاسیم نیز دارای 97-92 درصد فلدسپار پتاسیم هستند. این امر نشان دهنده پیشرفت تبلور جدایشی در ماگمای وابسته است. منطقه بندی موجود در تورمالین­های مورد بررسی هم در مقاطع نازک و هم در تجزیه های شیمیایی به خوبی مشهود است. در فلدسپارهای مورد بررسی، مقادیر نسبتاً بالای Rb (ppm 1319) و همچنین Cs (ppm 205) نشان دهنده­ی درجه جدایش بالا در  ماگمای وابسته است.     
کلیدواژه‌ها
آپلیت؛ پگماتیت؛ تبلور جدایشی؛ منطقه بندی؛ سیمین؛ پهنه‌ی سنندج-سیرجان
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آمار
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