تعیین محیط تکتونیکی، پتانسیل کانی‌زایی و شرایط تبلور توده کوارتزدیوریت‎بیوتیت‎دار شمال شرق دلیجان با کاربرد شیمی بیوتیت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‎شناسی، دانشگاه پیام نور، تهران، ایران

2 گروه زمین‎شناسی، دانشگاه شهید بهشتی، دانشکده علوم زمین، تهران، ایران

چکیده

معدن آهن سرویان به­طور ژنتیکی با توده گرانیتوئیدی سرویان همراه است. هدف از این پژوهش بررسی سنگ‎شناسی، کانی‎شناسی و تعیین شرایط تشکیل کانی‎های بیوتیت ‎توده کوارتزدیوریت ‎بیوتیت‎دار سرویان است و در این تحقیق در مورد اهمیت مطالعه این کانی در تعیین محیط تکتونیکی، پتانسیل کانی‎زایی و شرایط تبلور این توده بحث شده است. آنالیز الکترون میکروپروب بیوتیت‎های این توده نشان می‎دهد که این کانی‎ها از نوع بیوتیت‎های منیزیم‎دار غنی از Ti و Mg و فقیر ازAl  و Fe هستند. محتوای AlT بیوتیت‎ها در حدود 37/2-52/2، با (ƩFeO)/(ƩFeO+MgO) بین 55/0 تا 58/0 و تمرکز MgO در گستره 77/12-94/13 درصد وزنی است. این شرایط نشان می‎دهد که توده‎ی مذکور متعلق به سری ماگمایی کالک‎آلکالن بوده و از رده گرانیت‎های کوهزایی نوع I است که ماگمای منشأ آن در یک محیط فرورانش، حاصل از ذوب پوسته و گوشته تشکیل شده است. بیوتیت‎ها توده سرویان در دمای 750 درجه سانتی‎گراد و در شرایط فوگاسیته اکسیژن بالا و تحت فشار 6/0-1/1 کیلوبار متبلور شده‎اند. در نتیجه چگونگی تشکیل بیوتیت‎ها تایید می‎کند که توده سرویان در تشکیل ته‎نشست‎های آهن اسکارنی منطقه مشارکت داشته است.

کلیدواژه‌ها


عنوان مقاله [English]

Study of biotite quartzdiorite rocks of NW Delijan by using biotite mineral chemistry

نویسندگان [English]

  • Mahboobeh Jamshidibadr 1
  • Mahnaz Khademi Parsa 2
  • Faribourz Masoudi 2
1 Department of Geology, Payame Noor University, Tehran, Iran
2 Department of Geology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Extended abstract
Introduction
The composition of skarn's mineralizing fluids is closely related to the physicochemical conditions prevailing during the cooling and crystallization of magma. Biotite is an effective indicator for determining the physio-chemical conditions prevailing during the cooling and crystallization of magma. In this study, the biotite composition of Sarvian biotite quartz diorite from Urmia-Dokhtar magmatic arc was investigated to estimate the magma crystallization conditions and also to determine the petrological and metallogenic characteristics of the granitoid rocks.
Materials and methods
The study area is located 15 km northeast of Delijan city and in Markazi province (Figure 1). Miocene Sarvian quartzdiorite rocks are classified into three subgroups: quartzdiorite, micro quartzdiorite and biotite quartzdiorite. In this study, 21 spots of Sarvian biotite quartzdiorite were analyzed at the Iran Mineral Processing Research Center (Table 1).
Results and discussion
The biotites of Sarvian granitoid are crystallized at a temperature of about 750 ° C, oxygen fugacity is between 10-11 and 10-13 and the pressure is about 0.6-1.1 kbar. The mentioned crystallization conditions indicate that the biotite quartzdiorite rocks of Sarvian crystallized at high temperature, shallowly and under high oxygen fugacity conditions. In addition, it shows that Sarvian biotite quartzdiorite has a high chance of mineral exploration. Placement of Sarvian biotite quartzdiorite rocks in Cretaceous limestones and Eocene pyroclastics, crystallization at a pressure of about 1 kbar and the mentioned crystallization conditions, indicate the formation of skarns in the region. The formation of skarn iron ores in the area is a confirmatory examination that has been performed on the studies.
Conclusion
Emplacement of Sarvian biotite quartzdiorite rocks are at shallow depth and crystallization at high temperature conditions. High magnesium calc-alkaline magmatic series, high oxygen fugacity and type I orogenic granites from subduction of the oceanic crust below the continental plate leads to magma which is the result of melting and mixing of crust and mantle. So it has created suitable conditions for the formation of metal skarns.

کلیدواژه‌ها [English]

  • Biotite
  • Sarvian biotite quartzdiorite
  • Delijan
  • Urmieh-Dokhtar Zone
  • Crystallization conditions
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