ژئوشیمی و جایگاه تکتونوماگمایی سنگهای آتشفشانی ترشیری منطقه کنگان، شمال شرق سربیشه، خراسان جنوبی

زمین شناسی اقتصادی

مقاله 15، دوره 8، شماره 2 - شماره پیاپی 15، بهمن 1395، صفحه 553-568   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v8i2.54029

نویسندگان

مهشید ملکیان دستجردی¹؛ سید سعید محمدی^{* 1}؛ ملیحه نخعی²؛ محمد حسین زرین کوب¹

¹بیرجند

²صنعتی بیرجند

چکیده

منطقه کنگان در شمال شرق سربیشه، خراسان جنوبی و حاشیه شرقی بلوک لوت قرار دارد. در این منطقه، گدازه های بازالتی بر روی سنگهای حدواسط و اسیدی شامل آندزیت، داسیت، ریولیت (گاهی پرلیتی) رخنمون دارد. کانیهای اصلی بازالت شامل پلاژیوکلاز، اولیوین و پیروکسن، در آندزیت شامل پلاژیوکلاز، پیروکسن، بیوتیت، آمفیبول و در گدازه های اسیدی متشکل از پلاژیوکلاز، کوارتز، سانیدین، بیوتیت و آمفیبول هستند. سنگهای حدواسط و اسیدی ماهیت کالک آلکالن پتاسیم متوسط تا بالا و بازالت ماهیت آلکالن دارد. غنی شدگی LREE نسبت به HREE (7/28-14/21= Ce/Yb)، نسبت Zr/Y بالا (79/4 تا81/10)، غنی شدگی LILE و آنومالی منفی Eu، Nb، P،Ti ،Ba و Sr در گدازه های حدواسط و اسیدی بیانگر ماگماتیسم کالک آلکالن وابسته به فرورانش است. ویژگیهای ژئوشیمیایی نظیر نسبت La/Yb بالا (18/8)، محتوای پایین Rb به‌همراه نمودارهای تمایز محیط زمین‌ساختی، بیانگر محیط درون صفحه ای قاره ای برای بازالت است. ماگمای سازنده سنگهای مورد بررسی، حاصل ذوب‌بخشی یک منبع گارنت لرزولیتی غنی شده در عمق 100 تا 110 کیلومتری است.

کلیدواژه‌ها

آندزیت؛ آلکالی بازالت؛ حاشیه قاره ای فعال؛ کنگان؛ بلوک لوت

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