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Hedayaty Kharagh S N, Ghasemi H, Kazemi Hassanvand Z. Mineral chemistry and physical conditions of crystallization in Filshour and Goft dioritic intrusions, Southwest of Sabzevar. www.ijcm.ir 2019; 27 (3) :667-682
URL: http://ijcm.ir/article-1-1334-fa.html
URL: http://ijcm.ir/article-1-1334-fa.html
هدایتی خرق سیده نفیسه، قاسمی حبیب الله، کاظمی حسنوند زکیه. شیمی کانی و شرایط فیزیکی تبلور در تودههای دیوریتی کرتاسه پسین فیلشور و گفت، جنوب غرب سبزوار. مجله بلورشناسی و کانی شناسی ایران. 1398; 27 (3) :667-682
1- دانشگاه صنعتی شاهرود
چکیده: (2626 مشاهده)
تودههای نفوذی دیوریتی فیلشور و گفت به سن کرتاسه پسین در جنوب غرب سبزوار، در لبه شمالی پهنه ایران مرکزی قرار دارند. سنگهای این تودهها دارای بافتهای پورفیری، افیتی، ساب افیتی و میان دانهای در لبهها و دانهای در مرکز هستند و از کانیهای آمفیبول، پلاژیوکلاز و کلینوپیروکسن (در ساب افیتی) به همراه کوارتز (در کوارتزدیوریتها) تشکیل شدهاند. آمفیبول موجود در این سنگها در گروه کلسیمی و از نوع هورنبلند منیزیمدار است. ترکیب پلاژیوکلازها از آنورتیت تا لابرادوریت متغیر است. دماها و فشارهای بسته شدن و برقراری تعادل در آمفیبولها و پلاژیوکلازها بر اساس روشهای مختلف دما- فشارسنجی بین 918 تا 763 درجه سانتیگراد و 3 تا 5/5 کیلوبار (برابر با فشار عمقهای 10-18 کیلومتری) به دست آمده است. پیروکسنها در گستره وابسته به پیروکسنهای کلسیم، منیزیم و آهندار با ترکیب اوژیتی قرار دارند و از یک ماگمای اولیه در محیطی با گریزندگی اکسیژن بالا در فشارهای 5-2 کیلوبار بار در دماهای 1150-1000 درجه سانتیگراد متبلور شدهاند. شیمی کانی آمفیبول و پیروکسن بیانگر سرشت نیمهقلیایی ماگما و جایگاه فرافرورانش کمان ماگمایی برای این تودههای نفوذی است که با محیط جزایر کمانی درون اقیانوسی سنگهای ماگمایی کرتاسه پسین پهنه اقیانوسی فرافرورانشی سبزوار سازگار است.
فهرست منابع
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