کلریت‌زایی بیوتیت در گنبدهای داسیتی باغات (جنوب سیرجان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه هرمزگان

2 سازمان زمین شناسی و اکتشافات معدنی کشور

چکیده

گنبدهای داسیتی منطقه باغات در جنوب سیرجان و پهنه سنندج-سیرجان قرار دارند. کانی­های اصلی تشکیل­دهنده این سنگ­ها شامل پلاژیوکلاز و کلینوپیروکسن و کانی­های فرعی شامل بیوتیت، زیرکن و آپاتیت است. ترکیب شیمیایی بیوتیت­ها در این سنگ­ها نشان می­دهد که این کانی­ها به کانی­های کلریت و احتمالاً همرشدی­هایی با کانی روتیل دگرسان شده­اند. مقدار Fe/(Fe+Mg) در گستره 53/0 تا 57/0 و مقدار Si در گستره 7/5 تا 15/6 بوده و معرف کانی پیکنوکلریت است. در این کلریت­ها مقدار جزء کلریت (Xc)، بین 43/0 تا 85/0 قرار دارد که اشاره به وجود لایه­های اسمکتیت در ساختار کلریت دارد. ترکیب شیمیایی کلریت دمای تشکیل این کانی را 252 تا 263 درجه سانتیگراد نشان می­دهد و بیانگر ماهیت آهکی-قلیایی ماگمای سازنده سنگ­های مورد بررسی است که در مناطق کوهزایی تشکیل شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Dacitic dome in the Southern Sanandaj-Sirjan Zone- An example of chloritization in biotite minerals

چکیده [English]

The dacitic domes lie in the Sanandaj-Sirjan Zone. They were subjected to deformation resulting from tectonic movements. They are as oriented rocks which show deformation textures such as plagioclase with mechanical twin, biotite fish, and deformed clinopyroxene set in foliated groundmass. Under condition of hydrothermal alteration, biotites altered into chlorite with smectite interlayers and probably leucoxene and titanite intergrowths. The deformation has created micro-fractures and micro-cavities which has provided suitable spaces for fluids movements and hydrothermal alteration. The plagioclases show albitisation and sericitaion alteration (An 5-10) in these rocks.

کلیدواژه‌ها [English]

  • chlorite
  • biotite
  • aAlteration
  • Sanandaj-Sirjan Zone

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  • تاریخ دریافت: 13 خرداد 1396
  • تاریخ بازنگری: 08 شهریور 1396
  • تاریخ پذیرش: 15 مهر 1396

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