دوره 28، شماره 3 - ( 7-1399 )                   جلد 28 شماره 3 صفحات 771-788 | برگشت به فهرست نسخه ها


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Mousavi, Tahmasbi, Sarjoughian, Ahmadi Khalaji, Zare Shooli. The role of feldspar crystals zoning in interpreting the magmatic evolution of the Goushe granitoid Pluton (SE of Boroujerd). www.ijcm.ir. 2020; 28 (3) :771-788
URL: http://ijcm.ir/article-1-1529-fa.html
موسوی سیده اسما، طهماسبی زهرا، سرجوقیان فاطمه، احمدی خلجی احمد، زارع شولی معصومه. نقش منطقه‌بندی بلورهای فلدسپار در تفسیر دگرگونی ماگمایی توده گرانیتوئیدی گوشه (جنوب شرق بروجرد). مجله بلورشناسی و کانی شناسی ایران. 1399; 28 (3) :771-788

URL: http://ijcm.ir/article-1-1529-fa.html


1- دانشگاه لرستان
2- دانشگاه کردستان
چکیده:   (456 مشاهده)
توده گرانیتوئیدی گوشه در جنوب شرق بروجرد دارای ترکیب گرانیت، گرانودیوریت و برونبوم­­های ریزدانه­ای با ترکیب گرانودیوریت تا کوارتزمونزودیوریت است. حضور این برونبوم­ها به همراه شواهدی از بافت‌های غیرتعادلی چون لبه انحلالی و منطقه‌بندی در پلاژیوکلازها، بافت غربالی، لخته‌های مافیک، بیوتیت تیغه‌ای، بافت خال­خال فلدسپار قلیایی و آپاتیت سوزنی نشان دهنده شرایط ناپایدار و غیرتعادلی در محیط تبلور بوده که به احتمال بسیار در اثر صعود سریع ماگما و یا فرآیند آمیختگی ماگما ایجاد شده است. بلورهای فلدسپار قلیایی و پلاژیوکلاز در سنگ‌های نفوذی گوشه از دید ترکیب و بافتی ساختار منطقه‌ای نشان می‌دهند. ترکیب شیمیایی پلاژیوکلازها در سنگ‌های گرانیتوئیدی در گستره میان  اوایل آلبیت (An: 2) در لبه تا اوایل آندزین (An: 33) در مرکز و ترکیب پلاژیوکلاز برونبوم­ها در گستره به نسبت گسترده‌تری از اوایل الیگوکلاز (An: 11) تا اواسط آندزین (An: 36) تغییر می­کند. ترکیب فلدسپار قلیایی در سنگ‌های گرانیتوئیدی با درصد ارتوکلاز Or = 94 - 97 و در برونبوم­ها با Or = 69 - 96 مشخص شده است. فراوانی عناصر کمیاب Fe ،Sr ،Ba  و Mg در فلدسپارها، الگوی نوسانی نشان می‌دهند. الگوی نوسانی عناصر اصلی و کمیاب از مرکز به لبه در بلور فلدسپار به نقش مؤثر پدیده آمیختگی ماگمایی در شکل­گیری توده گرانیتوئیدی گوشه اشاره دارد.     
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نوع مقاله: پژوهشي | موضوع مقاله: تخصصي

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