سنگ شناسی، ژئوشیمی و جایگاه زمین ساختی توده های آداکیتی منطقه تیغناب و ارتباط آنها با کانه زایی اسکارن آهن (جنوب خاور سربیشه-خاور ایران)

زمین شناسی اقتصادی

مقاله 1، دوره 12، شماره 4 - شماره پیاپی 27، 1399، صفحه 449-470   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v12i4.81783

نویسندگان

ملیحه نخعی^{* 1}؛ سید سعید محمدی²

¹گروه مهندسی معدن، دانشگاه صنعتی بیرجند، بیرجند، ایران

²گروه زمین شناسی، دانشکده علوم، دانشگاه بیرجند، بیرجند، ایران

چکیده

منطقه مورد بررسی در بخش خاوری زون جوش‌خورده سیستان و در نقشه زمین ­شناسی 1:100000 ماهیرود قرار‌گرفته است. توده‌های نیمه‌عمیق با ترکیب کلی کوارتزدیوریتی، به درون سنگ آهک و ماسه‌سنگ­ های پالئوسن-ائوسن نفوذ کرده و اسکارن و کانی­ سازی آهن (مگنتیت) را تشکیل داده است. بافت­ های عمده در کوارتزدیوریت پورفیری شامل پورفیری با زمینه ریزدانه و پوئی‌کلیتیک هستند. پلاژیوکلاز، هورنبلند و کوارتز سازنده­ های اصلی این سنگ ­ها هستند. نمودارهای مختلف ژئوشیمیایی نشان‌دهنده انطباق سنگ­ های آذرین تیغناب با نفوذی­ های مرتبط با اسکارن­ های آهن است. ویژگی‌های ژئوشیمیایی مانند میزان میانگین SiO₂ (‌64/48 درصد)، Al₂O₃ (16/68 درصد)، Sr (ppm 470)، Y (ppm9/8)، Sr/Y (58/55)، Yb (ppm89/0) و آنومالی منفی ضعیف Eu، نشان‌دهنده ماهیت آداکیتی و از نوع پرسیلیس برای این سنگ­ ها‌ست. میزان Mg# (48/55 تا 1/68)، Sr/Y (میانگین 58/55)، Th/La (میانگین 32/0)، La/Yb_N (میانگین 2/4) و Th (میانگین ppm 8/1) نشان­ دهنده ذوب پوسته اقیانوسی فرورونده با ترکیب گارنت ­آمفیبولیتی برای تشکیل ماگمای آداکیتی است.  

کلیدواژه‌ها

کوارتزدیوریت پورفیری؛ گرانتیوئید نوع I؛ آداکیت پرسلیس؛ اسکارن؛ تیغناب؛ زمین درز سیستان

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