شیمی کانی و دما- فشارسنجی دایک‌های دیابازی ژوراسیک میانی قطع کننده مجموعه دگرگونی- آذرین شترکوه (جنوب شرق شاهرود)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی شاهرود

2 مؤسسه زمین‌شناسی و ژئوفیزیک آکادمی علوم چین و دانشگاه نورث‌وست (شمال‌غرب) چین

چکیده

مجموعه دگرگونی - آذرین شترکوه به سن نئوپروتروزوئیک­پایانی، در بخش ­شمالی پهنه­ساختاری ایران­مرکزی و در
جنوب­شرق شاهرود واقع است. این مجموعه توسط تعدادی دایک دیابازی به سن ژوراسیک­میانی قطع شده است. پلاژیوکلاز، پیروکسن و بیوتیت کانی­های اصلی تشکیل دهنده این دایک­ها هستند. پلاژیوکلازها بیشتر دارای ترکیب آندزینی (Ab69-51An31-49) هستند. پیروکسن­ها دارای ترکیب En30-45 Fs29-42Wo25-29 و از نوع اوژیت کم­کلسیم یا نیمه کلسیمی و بیوتیت­ها از نوع سرشار از منیزیم هستند. نتایج زمین‌دما- فشارسنجی با استفاده از شیمی کانی کلینوپیروکسن، دمای 1100 تا1200 درجه سانتی­گراد و فشار 2 تا 10 کیلوبار را نشان می­دهند. با توجه به ترکیب شیمیایی کانی­ها، سرشت ماگمای سازنده این دایک­ها، آهکی-قلیایی بوده و فوگاسیته اکسیژن طی تشکیل و تبلور کانی­های سازنده آنها نسبتاً کم بوده است. دایک­های مورد نظر، در یک جایگاه زمین­ساختی کششی موضعی درون قاره­ای از نوع حوضه کششی پشت­کمانی (فرورانش نئوتتیس به زیر پهنه ساختاری ایران مرکزی) تشکیل شده­اند.    

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry and Thermobarometry of Middle Jurassic diabasic dikes Cutting metamorphic - igneous Shotor-Kuh complex (SE Shahrood)

نویسندگان [English]

  • Shekari 1
  • Mahmmod Sadeghian 1
  • Habib allah Ghasemi 1
  • Zh Minggou 2
1 Shahrood University of Technology
2 Chinese Academy of Sciences, Beijing, China and Northwest University
چکیده [English]

Late Neoproterozoic metamorphic – igneous rocks of the Shotor Kuh complex is located in the northern edge of the Central Iran structural zone. This complex crosscut by several Middle Jurassic diabasic dikes. Plagioclase, pyroxene and biotite are the essential rock-forming minerals of these dikes. Plagioclases have mostly andesine composition (An31-49). Pyroxenes have following compositions: En30-45Fs29-42Wo25-29. Biotites with XFe = 0.49-0.53 and XMg= 0.46 - 0.5 are mostly Mg rich biotites. Temperatures and pressures obtained from clinopyroxene thermobarometry are in the range of 1200-1100°C and 10-2 kbar respectively. By attention to the results of chemichal composition of these minerals, magma forming of these dikes has calc-alkaline nature and during their crystallization oxygen fugacity has been low. The mentioned dikes generated in a tectonic setting accommodate to intracontinental extensional regime such as a back arc basin (subduction of Neo-Tethys oceanic lithosphere beneath the Central Iran zone).

کلیدواژه‌ها [English]

  • Mineral chemistry
  • Thermobarometry
  • diabasic dikes
  • Back arc basin
  • Shotor Kuh
  • Shahrood

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  • تاریخ دریافت: 20 آذر 1396
  • تاریخ بازنگری: 13 اسفند 1396
  • تاریخ پذیرش: 22 فروردین 1397

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