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Almasi A, Arjmandzadeh R, fransisko santoz J, karimpour M H. Whole rock geochemistry and Sr-Nd isotopes of mafic to intermediate subvolcanics bodies of Kashmar, evidence for subduction of Sabzevar back arc basin beneath Lut block. www.ijcm.ir 2018; 25 (4) :711-726
URL: http://ijcm.ir/article-1-990-fa.html
URL: http://ijcm.ir/article-1-990-fa.html
الماسی علیرضا، ارجمندزاده رضا، فرانسیسکو سانتوز ژوزه، کریم‌پور محمدحسن. شیمی سنگ و ایزوتوپ‌های Sr-Nd تودههای نیمهعمیق مافیک- حدواسط کاشمر، شاهدی بر فرورانش حوضه پشت کمان سبزوار به زیر بلوک لوت. مجله بلورشناسی و کانی شناسی ایران. 1396; 25 (4) :711-726
1- دانشگاه لرستان
2- دانشگاه پیام نور
3- دانشگاه آویرو
4- دانشگاه فردوسی
2- دانشگاه پیام نور
3- دانشگاه آویرو
4- دانشگاه فردوسی
چکیده: (3966 مشاهده)
براساس شواهد صحرایی، تودههای نیمهعمیق مافیک-حدواسط کاشمر به دو مجموعه قدیمی (غالبا استوکهای گابرو، دیوریت، کوارتزدیوریت/مونزودیوریت) و مجموعه جدید (دسته آذرین تیغههای موازی کوارتزمونزودیوریتی) تقسیم میشوند. از لحاظ روابط قطعشدگی، مجموعه قدیمی سنی بین قدیمیترین واحدهای آتشفشانی منطقه (57 میلیون سال) و گرانیتوئیدهای ائوسن (40 میلیون سال) دارد، اما دسته دایکهای موازی به پس از ائوسن (الیگوسن ؟) نسبت داده میشوند. تودههای نیمهعمیق مافیک-حدواسط با ویژگی آهکی-قلیایی پتاسیم بالا تا شوشونیتی، متاآلومین تا کمی پرآلومین، غنیشدگی LILE/HFSE و LREE [8/6-3/5La/Yb)N = )] و تخلیه از HREE، یادآور کمانهای منطقه فرورانشاند. این ویژگیها به همراه بیهنجاری منفی Eu نشاندهنده تشکیل ماگما در عمق پایداری پلاژیوکلاز و آلودگی ماگما با پوسته قارهای است، که طی ذوب سنگ گارنت باقیمانده است. روند خطی اکسید عناصر اصلی و فرعی در نمودارهای هارکر دلالت بر اهمیت تبلور جدایشی در تکامل ماگمایی دارد. میانگین نسبتهای ایزوتوپ اولیه 87Sr/86Sr و 143Nd/144Nd (در 50 میلیون سال) برای نمونههای مجموعه قدیم به ترتیب دارای گستره 7062/0-7054/0 و 51264/0-51262/0 و میزان εNdi دارای گستره 08/1 تا 42/1 است. نسبتهای ایزوتوپ اولیه 87Sr/86Sr و 143Nd/144Nd (در 30 میلیون سال) برای دسته دایکهای موازی به ترتیب 7056/0 و 51263/0 و مقدار εNdi آن 59/0 است. مقادیر εNdi مثبت و ISr کم در همه سنگ ها همراه با TDM اشان (8/0-6/0) ، دلالت بر این دارد که از ذوب بخشی منبع گوشته سنگکرهای، که با گدازههای حاصل از فرایندهای فرورانش قبل تر از آن تعدیل شده است، تشکیل شده اند. براساس نمودارهای Th/Ta نسبت به Nb/Ta و نمودار Nb/Y نسبت به Zr/Y، هر دوی فرآیندهای فرورانش و کافتزایی در تشکیل سنگ های کاشمر دخیل بودهاند. این ویژگی با فرورانش پوسته اقیانوسی سبزوار به زیر قلعه لوت سازگار است.
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