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ملیحه نخعی سید احمد مظاهری محمد حسن کریم پور جی لنگ فارمر چارلز استرن محمد حسین زرین کوب محمد رضا حیدریان شهری

چکیده

در منطقه بیشه واقع در شرق بلوک لوت، هورنبلند دیوریت های پورفیری در سنگهای رسوبی و آذرین (توف‌ها و سنگهای دیوریتی پیروکسن‌دار) نفوذ کرده و به‌ترتیب تشکیل اگزواسکارن و اندواسکارن داده است. بخشهای تغییر نیافته سنگهای دیوریتی پیروکسن‌دار، دارای ماهیت کالک آلکالن پتاسیم بالا و متاآلومین (78/1 A/NK≥ و 95/0(A/CNK≤ هستند. نمودار چند عنصری به‌هنجار شده با گوشته اولیه نشان دهنده غنی شدگی از عناصر LIL مانند Rb، Ba، Cs و تهی شدگی از عناصر HFS نظیر Nb، P، Ti، Y و Yb است. نمودار عناصر نادر خاکی بیانگر مقادیر (La/Yb)N از 75/7 تا 63/8 و بی هنجاری منفی ضعیف Eu می باشد. این خصوصیات به همراه مقادیر بالای Th/Yb و Ta/Yb نشان‌دهنده ماگماتیسم وابسته به مناطق فرورانش حاشیه قاره هاست. تهی‌شدگی مشخص Nb و Ti ، میزان نسبتاً بالای Mg#، نسبتهای اولیه 87Sr/86Sr ( 70606/0)، 143Nd/144Nd ( 512424/0) و Nd ε (05/3-) نشان می دهد که ماگمای سازنده سنگهای مورد مطالعه از گوشته غنی شده منشأ گرفته و دچار آغشتگی پوسته ای شده است. مقادیر بالای Rb، Th، K و مقدار پایین P و Ti در سنگهای مورد بررسی مؤید آلودگی ماگما در پوسته فوقانی طی تکامل ماگما است. میزان Ba/Rb پایین (4/7-6/4) و Rb/Sr بالا (22/0-17/0)، نشاندهنده حضور فلوگوپیت در گوشته منشأ است. با توجه به میزان بالای CaO+ Al2O3 نمونه های مورد مطالعه (متوسط 3/22 درصد)، میتوان گارنت پیروکسنیت فلوگوپیتدار را به‌عنوان منشأ ماگما در نظر گرفت. سن‌سنجی به روش زیرکن-اورانیم-سرب بر روی پیروکسن دیوریت پورفیری نشان می‌دهد که این ماگماتیسم در 07/44 میلیون سال پیش یعنی در ائوسن میانی(Lutetian) رخ داده است.

جزئیات مقاله

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ارجاع به مقاله
نخعیم., مظاهریس. ا., کریم پورم. ح., فارمرج. ل., استرنچ., زرین کوبم. ح., & حیدریان شهریم. ر. (۱۳۹۳-۱۰-۱۵). پتروژنز و سن‌ سنجی زیرکن-اورانیم- سرب سنگهای دیوریتی پیروکسن‌ دار اسکارنی شده منطقه بیشه (جنوب بیرجند- شرق ایران). زمین‌شناسی اقتصادی, 6(2), 393-409. https://doi.org/10.22067/econg.v6i2.31772
نوع مقاله
علمی- پژوهشی