شیمی کانی و توزیع اندازه بلور پلاژیوکلازها در توده نفوذی مونزونیتی کانسار مس پورفیری سریدون، ایران: با تأکید بر فرایندهای کنترل‌ کننده تکامل ماگما

مقالات آماده انتشار

نوع مقاله : مقاله پژوهشی

نویسندگان

مهدیه بامروت ¹

سارا درگاهی ²

محسن آروین ³

علیرضا شاکر ⁴

جیمی جی ویلکینسون ⁵

ادگار ای کورتس-کالدرون ⁶

مجید امین زاده ⁷

¹ دانشجوی دکتری، گروه زمین‌شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران

² دانشیار، گروه زمین‌شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران

³ استاد، گروه زمین‌شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران

⁴ استادیار، گروه زمین‌‌شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران

⁵ استاد، گروه علوم‌زمین و مهندسی، دانشکده مهندسی، دانشگاه امپریال کالج لندن، لندن، بریتانیا

⁶ پژوهشگر، مرکز تصویربرداری و تحلیل، موزه تاریخ طبیعی، لندن، بریتانیا

⁷ رئیس بخش زمین‌شناسی و زهکشی، مجتمع مس سرچشمه، شرکت صنایع ملی مس ایران

10.22067/econg.2026.1165

چکیده

کانسار مس پورفیری سریدون، در بخش میانی کمربند مس پورفیری کرمان و سه کیلومتری شمال‌شرقی معدن مس سرچشمه واقع‌شده است. این پژوهش، با توجه به نقش پلاژیوکلاز در بازسازی فرایندهای تبلور ماگما، بررسی کیفی و کمی بلورهای پلاژیوکلاز توده مونزونیتی کانسار مس سریدون با بهره‌گیری از بررسی‌های سنگ‌شناسی، شیمی‌کانی و پراکندگی اندازه متمرکز است. این واحد سنگی که از نظر ترکیب از مونزونیت تا کوارتز مونزونیت متغیر است، شامل کانی‌های اصلی پلاژیوکلاز، کوارتز، فلدسپار پتاسیم، بیوتیت،آمفیبول و همچنین کانی‌های فرعی کدر اغلب از نوع مگنتیت، آپاتیت و زیرکن است. ترکیب بلورهای پلاژیوکلاز مورد بررسی از لابرادوریت تا آلبیت (An_3.0-55.0Ab_44.1-94.5Or_0.0-17.7, n= 80)  متغیر است. بر اساس بررسی‌های پراکندگی اندازه بلور، الگوهای نیمه لگاریتمی بلورهای پلاژیوکلاز مورد بررسی نشان‌دهنده تبلور چند مرحله‌ای ماگما در اعماق مختلف است. همچنین، وجود بافت غربالی، منطقه‌بندی نوسانی و نتایج پراکندگی اندازه بلور نشان‌دهنده کاهش فشار و تزریق پالس‌های مافیک در یک سامانه پویاست. با فرض نرخ رشد ثابت و چگالی هسته (n0)، نرخ هسته‌بندی بلورهای پلاژیوکلاز  بین ^1-/s^3-mm ^11- 10 Î 66  تا ^1-/s^3-mm 10^-11  Î64  تعیین‌شد. همچنین، بر اساس داده‌های توزیع اندازه بلورهای سه‌بعدی و با استفاده از نرخ رشد ^10- 10، زمان اقامت بلورهای پلاژیوکلازها بین 56 تا 63  سال برآورد شد. زمان اقامت محاسبه‌شده و آلومینیم اضافی بلورهای پلاژیوکلاز مورد بررسی با جای‌گیری ماگما در سطوح کم‌عمق‌تر و پتانسیل بالای آن برای آزادسازی سیالات همخوانی دارد؛ هرچند توده مونزونیتی فاز مسئول کانه‌زایی در کانسار مس پورفیری سریدون محسوب نمی‌شود.

کلیدواژه‌ها

توده نفوذی مونزونیتی

کانسار مس پورفیری سریدون

پراکندگی اندازه بلور

نرخ هسته بندی

زمان اقامت

پلاژیوکلاز

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