شیمی کانی‌های سنگ‌های بازالتی پرمین شمال بلده (البرز مرکزی): بحث زمین‎دمافشارسنجی و جایگاه زمین‎ساخت- ماگمایی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

2 گروه زمین شناسی دانشگاه خوارزمی

3 استاد، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

4 استادیار، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

چکیده

سنگ‌های آتشفشانی پرمین البرز مرکزی (شمال خاور بلده- سیاه‌بیشه) در میان سازندهای روته و نسن رخنمون دارند. ترکیب این سنگ‌ها بیشتر در محدوده بازالت هستند و از دید بافتی بیشتر پلاژیوکلاز- فیریک هستند. کانی‌های فرومنیزین همچون کلینوپیروکسن و الیوین فراوانی مودال زیادی ندارند و در مواردی کاملاً دگرسان شده‌اند. بر پایه تجزیه نقطه‌ای کانی‌ها، شیمی کلینوپیروکسن‌ در محدوده دیوپسید جای دارد و ترکیب پلاژیوکلاز لابرادوریتی (50<An%<55) است. نتایج زمین‎دمافشارسنجی کلینوپیروکسن­ و پلاژیوکلاز نشانگر فشار کمتر از 5/2 کیلوبار و دمای 1050 تا 1200 درجه سانتی‌گراد است. همچنین شیمی کلینوپیروکسن‌ها با میزان بالای TiO2 (94/4 تا 24/7 درصد وزنی) مشخص می‌شود. داده‌های شیمیایی کلینوپیروکسن نشانگر مذابی با ترکیب بازالتی آلکالن است که در یک جایگاه زمین‎ساخت- ماگمایی درون صفحه‌ای تشکیل ‌شده است. بر پایه داده‌های این پژوهش می‌توان گفت که در زمان پرمین، البرز مرکزی به‌صورت یک حاشیه غیرفعال در جنوب پالئوتتیس جای دارد و فعالیت ماگمایی آن با زمین‌ساخت کششی اواخر پالئوزوئیک در حاشیه شمالی گندوانا و مقارن با مراحل آغازین گسترش نوتتیس قابل تفسیر است.

کلیدواژه‌ها


عنوان مقاله [English]

Mineral chemistry of the Permian basalts from North of Baladeh Central Alborz: Geothermobarometry and tectonomagmatic setting

نویسندگان [English]

  • F. Rostami 1
  • M. Delavari 2
  • S. Amini 3
  • A. Dolati 4
1 M.Sc. Student, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran
3 Professor, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran
4 Assistant Professor, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran
چکیده [English]

The Permian volcanic rocks of Central Alborz (northeast of Baladeh- Siahbisheh) crop out between Ruteh and Nesen Formations. The volcanic rocks are predominantly basaltic and plagioclase- phyric. Ferromagnesian minerals such as clinopyroxene and olivine are not modally abundant and sometimes are totally altered. Based on microprobe data, clinopyroxene and plagioclase are diopside (En34.2-36.4 Wo43.1-47.2 Fs14.9-18.1) and labradorite (50<An%<55), respectively. Clinopyroxene and plagioclase geothermobarometric calculations shows the temperature and pressure ranges of 1050 to 1200 °C and 2 contents (4.94- 7.24 wt. %). Clinopyroxene chemical data display that the parent melt was alkaline basalt, generated in a within plate setting.  On the basis of our findings it can be stated that, Central Alborz was a continental passive margin in middle- late Permian at south of Paleo-Tethys and its magmatism was likely triggered by late Paleozoic extensional tectonism of northern margin of Gondwana during the early stages of Neo-Tethyan development.

کلیدواژه‌ها [English]

  • Geothermobarometry
  • Alkali basalt
  • Intra-plate
  • Permian
  • Baladeh
  • Central Alborz

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