بررسی تطبیقی ‌کانی‌شناسی و زمین شیمی سنگ‌های فلسیک دگرسان شده در استان یزد

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین شناسی، پردیس علوم، دانشگاه یزد، یزد

چکیده

سنگ‌های فلسیک تجزیه شده و خاک‌های همراه آن در مناطق مختلف استان یزد بعنوان ماده اولیه سرامیک، چینی و شیشه برداشت‌ می‌شوند. به منظور بررسی شدت دگرسانی و عوامل موثر بر آن، تغییرات بافتی، کانی‌شناسی فرآورده­های دگرسانی در بخش‌های آذرین سری ریزو وابسته به پرکامبرین پیشین (زرین و توت)، متاگرانیت‌های پرکامبرین (ساغند)، لویکوگرانیت‌های پس از ژوراسیک (خضرآباد) و داسیت‌های نئوژن (عبداله) بررسی تطبیقی شدند. ‌کانی‌های عمده فرآورده­های دگرسانی این مناطق شامل کوارتز، فلدسپار، ایلیت، کائولینیت و مونتموریونیت هستند. شاخص‌ شیمیایی دگرسانی (CIA)، شاخص‌ شیمیایی هوازدگی(CIW)، شاخص‌ تغییرات ترکیبی (ICV) و شاخص‌شیمیایی دگرسانی پلاژیوکلاز(PIA)  برای فرآورده­های دگرسانی سنگ‌های دگرگونی پرکامبرین، لویکوگرانیت‌های پس از ژوراسیک و سنگ‌های داسیتی نئوژن درجه ضعیف تا متوسط و برای فرآورده­های دگرسانی بخش‌های آذرین سری ریزو درجه متوسط تا قوی را نشان می‌دهند. تغییرات مشاهده شده ناشی از تنوع سنگ‌های مادر فلسیک، ویژگی‌های زمین ساختاری منطقه، سن و شرایط آب و هوایی است.

کلیدواژه‌ها

عنوان مقاله [English]

Comparative study of mineralogy and geochemistry of altered felsic rocks in Yazd province

نویسندگان [English]

  • Khodami
  • Tajbakhsh
چکیده [English]

Altered quartz feldspathic rocks and associated soils with the felsic source rock crops out in different areas of the Yazd Province, and are used as ceramic, porcelain and glass raw materials. Alteration products in the igneous rocks of the Cambrian Rizo series (Zarrin and Tut), Precambrian metagranites (Saghand), post-Jurassic leucogranites (Khezrabad) and Neogene Dacites (Abdolah) were investigated and compared to each others for the intensity of alteration, textural variations, and mineralogy in the units. The major mineralogy of their alteration products includes quartz, feldspar, illite, kaolinite, and montmorillonite. Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), Index of compositional variety (ICV), and Plagioclase Index of Alteration (PIA) were determined for the alteration products. The indices values show a weak to moderate degree of alteration for Saghand metagranites, Khezrabad leucogranites, and Abdolah Dacites, and a moderate to strong degree of alteration for Rizo series. The observed differences have resulted from the lithologic type of the source rocks, age, climatic conditions as well as structural characteristics of the areas.

کلیدواژه‌ها [English]

  • Yazd Province
  • felsic rocks
  • clay mineralization
  • Chemical index of alteration (CIA)
  • Chemical Index of Weathering (CIW)
  • Index of compositional variety (ICV)
  • Plagioclase Index of Alteration (PIA)

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مجله بلورشناسی و کانی شناسی ایران
دوره 29، شماره 1 - شماره پیاپی 81
فروردین 1400
صفحه 165-178

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  • تاریخ دریافت: 20 اردیبهشت 1399
  • تاریخ بازنگری: 02 اردیبهشت 1399
  • تاریخ پذیرش: 22 تیر 1399

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