اختلاط ماگمایی در گرانودیوریت¬ها و انکلاوهای مافیک ده بالا: شاهدی برای ماگماتیسم کالک-آلکالن نوع I از دو منشا پوسته زیرین و گوشته لیتوسفریک
الموضوعات :زینب قرامحمدی 1 , علی کنعانیان 2 , محسن ضرغام 3
1 - دانشگاه تهران
2 - دانشکده زمین‌شناسی، پردیس علوم، دانشگاه تهران
3 - دانشگاه پیام نور تهران
الکلمات المفتاحية: اختلاط ماگمایی انکلاو¬, های میکروگرانولار مافیک توده نفوذی ده بالا پوسته زیرین کالک¬, آلکالن.,
ملخص المقالة :
توده گرانودیوریتی ده بالا با روند شرقی - غربی در 45 کیلومتری جنوب غرب بویین‌زهرا، در استان قزوین برونزد دارد. این توده حاوی انکلاوهای میکروگرانولار مافیک متعدد با ترکیب دیوریت - کوارتزمونزودیوریت است. انکلاوها با اشکال گرد شده و بیضوی با اندازه های دو تا 20 سانتی متر در گرانودیوریت های میزبان پراکنده شده اند. انکلاوها عموماً تماس ناگهانی با گرانودیوریت های میزبان دارند و از مجموعه کانی های آذرین تشکیل شده اند. وجود شواهد بافتی نشان‌دهنده عدم تعادل از قبیل حضور پلاژیوکلازهایی با زونینگ ترکیبی و سطوح تحلیلی مکرر، سوزن های آپاتیت و کوارتزهای اوسلی در انکلاوها نشانه تغییرات شیمیایی و یا حرارتی مذاب در حین رشد بلور و شاهدی برای وقوع اختلاط ماگمایی هستند. انکلاو ها از LREES و LILES غنی شده و از HFSES تهی شده هستند. گرانودیوریت ها با محتوای 9/66-2/64= SiO2، از نوع کالک آلکالن غنی از پتاسیم بوده و مشخصات سنگ های متا آلومین (1/1>A/CNK) را نشان می دهند. غنی شدگی از عناصر ناسازگار La, Ce, Rb, Th, K وNd در کنار آنومالی منفیTi, Ba, Eu, Nb و P دلالت بر نقش پوسته زیرین در شکل گیری ماگمای سازنده گرانودیوریت ها دارد، اما محتوای نسبتاً بالای≠Mg ( 43/0- 039/0) پیشنهاد می کند که گرانودیوریت های ده بالا از اختلاط ماگمای مافیک حاصل از گوشته با ماگمای فلسیک پوسته به وجود آمده باشند. انکلاوها با مقادیر نسبتاً پایین 2/58- 8/52=SiO2، 92/0- 77/0=A/CNK، مقدار متوسط پتاسیم 8/3-4/1=K2O و مقدار نسبتاً بالای (46/0-4/0)≠Mg مشخص می شوند. بر اساس ویژگی های ژئوشیمیایی و مقادیر 8/1-6/1=Dy/Yb، به نظر می رسد ماگمای سازنده انکلاوها از ذوب بخشی گوه گوشته در زون انتقالی اسپینل- گارنت حاصل شده و در تماس با ماگماهای فلسیک حاصل از ذوب پوسته، تا حدی متحول شده باشد.
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