شیمی‌کانی و دما-فشار کانی‌های همزیست در سنگ‌های آندزیتی شمال سقز، شمال غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشکده علوم پایه، دانشگاه بوعلی سینا، همدان، ایران

2 گروه علوم زمین، دانشگاه ایالتی پنسیلوانیا، دانشگاه پارک، پ.ا. 16802، امریکا

چکیده

منطقه سقز در شمال غرب ایران، در شمال پهنه سنندج - سیرجان و استان کردستان قرار دارد. سنگ‌های آندزیتی و آندزیت بازالتی آن از کانی‌های آمفیبول، پلاژیوکلاز، کلینوپیروکسن و ارتوپیروکسن تشکیل شده‌اند. ترکیب آمفیبول‌ها از منیزیو-‌هستینگزیت، منیزیو‌-هورنبلند تا چرماکیت–پارگازیت متفاوت است. ترکیب پیروکسن‌ها اوژیت- 39.33 En40.37-40.26 Fs20.49-13.89  Wo45.39 و انستاتیت  En59.863-71.04Fs26.083-36.850Wo 2.842-3.287است. مقدار آنورتیت پلاژیوکلازها از 23/39 تا 70/68 درصد نوسان دارد و ترکیب آنها بین آندزین تا لابرادوریت متغیر است. براساس دما و فشارسنجی بر پایه آلومینیوم در شبکه آمفیبول‎ها، دما و فشار تبلور °C 895-961 و  kbar11/2 – 59/4  بوده است. بر اساس مقدار Ti، دمای °C 800 تا 950 بدست آمده است. بررسی شیمی کانی کلینوپیروکسن نشان می‌دهد که انواع سنگ‌های آتشفشانی مورد بررسی در دمای 1100 تا 1250 درجه سانتی‌گراد و فشار 2 تا 10 کیلوبار متبلور شده‌اند. همچنین مقدار AlIV و Si بیانگر تبلور آمفیبول‌ها در فشارهای پایین است   که با مقدار AlIV/AlVI در پیروکسن‌های کم فشار تا فشار متوسط این پژوهش همخوانی دارد. افزون بر این، بررسی مقدار کاتیون‌های AlVI+2Ti+Cr و Na+AlIV در شبکه پیروکسن‌ها و مقادیر LogƒO2 و Fe# در شبکه آمفیبول‌ها چنین برداشت می‌گردد که آن‌ها در شرایط فشاربخشی بالا متبلور شده­اند.

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry and P-T estimation of coexisting minerals in the andesitic rocks from the N-Saqqez, NW Iran

نویسندگان [English]

  • Sara Damchin mashak 1
  • Ashraf Torkian 1
  • Tanya Furman 2
1 Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
2 Department of Geology, State Pennsylvania university, Park university, P.A.16802, America
چکیده [English]

The studied area (Saqqez) is located in the north of Sanandaj-Sirjan zone in the Kurdistan province, northwestern Iran. Andesite and basaltic-andesite rocks contain amphibole, plagioclase, clinopyroxene, and orthopyroxene minerals with porphyritic and seriate textures. The composition of amphiboles ranges from magnesio-hastingsite, magnesio-hornblende to tschermakite-pargasite. Pyroxenes are augite Wo45.39 - 39.33 En40.37-40.26 Fs20.49-13.89 and enstatite Wo 2.842-3.287 En59.863-71.04Fs26.083-36.850 in compositions. The anorthite content in plagioclase is between 67 and 80 (wt.%) and their composition varies from labradorite to bytownite crystals. Thermobarometry through the method of Al- amphibole indicates crystallization temperature is between 895 and 961 °C with 2.11 - 4.59 kbar pressure. Moreover, the amount of Ti, indicates temperature crystalizing in the range 800 to 950 °C for amphibole. Clinopyroxene mineral chemistry based on the type of pyroxene shows that the studied volcanic rocks were crystallized at temperatures and pressures of 1100-1250 °C and 2-10 Kbar, respectively. Also, the amount of AlIV and Si indicates that amphiboles were crystalized at low pressures, which is consistent with the amount of AlIV/AlVI in the low to medium pressure pyroxenes of the investigation. Furthermore, the amount of AlVI+2Ti+Cr and Na+AlIV in the pyroxene crystals and LogƒO2 and Fe# values in studied amphiboles show they were crystallized in high oxygen fugacity.

کلیدواژه‌ها [English]

  • plagioclase
  • amphibole
  • pyroxene
  • Thermobarometry
  • oxygen fugacity

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  • تاریخ دریافت: 06 آبان 1402
  • تاریخ بازنگری: 26 آذر 1402
  • تاریخ پذیرش: 09 دی 1402

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