دوره 30، شماره 4 - ( 10-1401 )
جلد 30 شماره 4 صفحات 626-615 |
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1- دانشگاه تبریز
چکیده: (731 مشاهده)
منطقهی مورد بررسی در نزدیکی روستای زینآباد، شمالغرب تبریز واقع است. واحدهای چینه ای پرکامبرین تا کرتاسه رخنمون اصلی سنگهای منطقه را تشکیلمیدهند. سنگهای بازیک مورد بررسی به صورت گدازه و دایکهای دیابازی در ارتباط با سنگهای شیل، ماسه سنگ و کنگلومرای سازند شمشک (تریاس پسین-ژوراسیک پیشین) تشکیل شده اند. این سنگ‌ها بسیار هوازده بوده و دارای حفره‌های پرشده فراوان از کانیهای ثانویه کلریت، کلسیت، زئولیت و کانیهای تیره هستند. بر اساس بررسیهای میکروسکوپی در سنگهای بازیک مورد بررسی، پلاژیوکلاز کانی اصلی تشکیل‌دهنده است و به احتمال بسیار کانیهای آهن و منیزیمدار پیروکسن بهطورکامل به کلریت، کلسیت، اپیدوت و کانیهای تیره تجزیهشدهاند. مهم‌ترین بافت‌های سنگی شامل پورفیری، گلومروپورفیری، بادامکی، غربالی و نیمه پوست ماری (ساب افتیک) هستند. براساس نتایج زمین شیمیایی، ترکیب سنگهای بازیک مورد بررسی در گستره بازالت با ماهیت قلیایی است. بر اساس نمودارهای عنصری، نمونههای مورد بررسی دارای مقادیر بالای U، Th و عناصر سنگ دوست (LILE) بزرگ یون (چون Ba, Rb) هستند. ناهنجاری مثبت سرب در این نمودارها را میتوان به نقش پوسته قارهای و یا دگرنهادی گوه گوشتهای توسط سیالهای برآمده از پوستهی اقیانوسی فرورو در تشکیل سنگهای مورد بررسی نسبت داد. در نمودارهای عناصر خاکی نادر، نمونههای مورد بررسی غنی از عناصر خاک نادر سبک (LREE) و تهی از عناصر خاکی نادر سنگین (HREE) هستند و نسبت بالای La به Yb در آنها را به احتمال بسیار میتوان به ذوب بخشی آنها از یک خاستگاه گارنتدار در اعماق زیاد نسبت داد. محیط زمینساختی تشکیل سنگهای بازیک زین آباد وابسته به محیط درون ورقهای است که به احتمال بسیار در ارتباط با فازهای کششی پس از برخورد قارهای سیمرین به درون پوسته قارهای آذربایجان در شمالغرب ایران نفوذ کردهاند.
واژه‌های کلیدی: بازالت، زمین شیمی، ژوراسیک، شمشک، زین آباد.
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