سامانه مدیریت نشریات علمی دانشگاه دامغان

ابراهیمی, محمد, عمادی, فاطمه, آسیابانها, عباس. (1399). سنگ‌نگاری و زمین شیمی توده نفوذی کهریزبیگ، جنوب غرب زنجان. مجله زمین شیمی ایران, 28(1), 141-158. doi: 10.29252/ijcm.28.1.141
محمد ابراهیمی; فاطمه عمادی; عباس آسیابانها. "سنگ‌نگاری و زمین شیمی توده نفوذی کهریزبیگ، جنوب غرب زنجان". مجله زمین شیمی ایران, 28, 1, 1399, 141-158. doi: 10.29252/ijcm.28.1.141
ابراهیمی, محمد, عمادی, فاطمه, آسیابانها, عباس. (1399). 'سنگ‌نگاری و زمین شیمی توده نفوذی کهریزبیگ، جنوب غرب زنجان', مجله زمین شیمی ایران, 28(1), pp. 141-158. doi: 10.29252/ijcm.28.1.141
ابراهیمی, محمد, عمادی, فاطمه, آسیابانها, عباس. سنگ‌نگاری و زمین شیمی توده نفوذی کهریزبیگ، جنوب غرب زنجان. مجله زمین شیمی ایران, 1399; 28(1): 141-158. doi: 10.29252/ijcm.28.1.141

سنگ‌نگاری و زمین شیمی توده نفوذی کهریزبیگ، جنوب غرب زنجان

مجله بلورشناسی و کانی شناسی ایران
مقاله 10، دوره 28، شماره 1 - شماره پیاپی 77، فروردین 1399، صفحه 141-158    اصل مقاله (2.13 M)
نوع مقاله: مقاله پژوهشی
شناسه دیجیتال (DOI): 10.29252/ijcm.28.1.141
نویسندگان
محمد ابراهیمی* 1؛ فاطمه عمادی1؛ عباس آسیابانها2
1دانشگاه زنجان
2دانشگاه بین‌المللی امام خمینی(ره)
چکیده
توده­ نفوذی کهریزبیگ در شمال‌ غرب ایران و در پهنه ساختاری ایران مرکزی واقع بوده و داخل آهک­های کرتاسه نفوذ و موجب دگرگونی مجاورتی آنها شده است. همچنین، قطعات تخریبی این توده­ در بخش‌های کنگلومرایی سازند قرمز زیرین به سن الیگوسن آغازین قابل مشاهده هستند و بنابراین سن پس از کرتاسه­ و پیش از الیگوسن دارد. ترکیب این توده در گستره­ گرانیت تا گرانودیوریت متغیر بوده و حجم عمده آن را گرانودیوریت تشکیل داده است. کانی‌های سنگ‌ساز اصلی آن شامل کوارتز، پلاژیوکلاز و فلدسپار قلیایی همراه با کانی‌های مافیک بیوتیت و آمفیبول و کانی­های فرعی اسفن، آپاتیت و کانی­های کدر هستند. کلریت و کلسیت نیز به عنوان کانی­های ثانویه وجود دارند. بافت غربالی، بافت اسفن چشمی، لخته­های مافیک، احاطه شدن بیوتیت توسط آمفیبول و بیوتیت­های تیغه­ای شواهد بافتی هستند که به احتمال بسیار بر اثر فرایند آمیختگی ماگمایی در سنگ‌های مورد بررسی ایجاد شده‌اند. فراوانی برونبوم­های مافیک ریزدانه در بخش‌هایی از این توده نیز این امر را تایید می‌کند. الگوی عناصر خاکی نادر بهنجار شده نسبت به کندریت برای سنگ‌های مورد بررسی به نسبت هموار بوده و دارای غنی‌شدگی از عناصر خاکی نادر سبک (LREE) نسبت به عناصر خاکی نادر سنگین (HREE) است. غنی‌شدگی LREEها نسبت به HREEها می‌تواند به‌دلیل درجه پایین ذوب بخشی، فراوانی LREE در خاستگاه و یا آلودگی ماگما به­ مواد پوسته‌ای باشد. در نمودارهای عنکبوتی، عناصر سنگ دوست درشت یون چون روبیدیم، پتاسیم، توریم و برخی عناصر خاکی نادر سبک نسبت به عناصر با شدت میدان بالا مانند Yb، Sm،Zr ،  Taو  Nbغنی‌شدگی نشان می‌دهند. بی هنجاری مثبت عناصر روبیدیم، توریم و پتاسیم می‌تواند ناشی از آمیختگی ماگماهای گوشته‌ای و پوسته‌ای و یا به دلیل آلایش ماگمای گوشته‌ای با سنگ‌های پوسته‌ای باشد. بی‌هنجاری منفی Nb-Ta و Ti می­تواند به دلیل فعالیت ماگمایی وابسته به فرایندهای فرورانش، کمبود این عناصر در خاستگاه و یا مشارکت پوسته در فرایندهای ماگمایی باشد. بر اساس بررسی‌های سنگ­شناسی و زمین شیمیایی، توده گرانیتوئیدی کهریزبیگ از نوع I و دارای ترکیب آهکی قلیایی و متاآلومین است. توده­ نفوذی کهریزبیگ در یک محیط کمان ماگمایی برآمده از فرورانش سنگ کره اقیانوسی نئوتتیس به زیر خرده‎قاره­ای ایران مرکزی، تشکیل شده‌ است.    
کلیدواژه‌ها
گرانیتوئید نوع I؛ کمان ماگمایی؛ آمیختگی ماگمایی؛ کهریزبیگ؛ زنجان
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