کانی‌شناسی و زمین‌شیمی ذخیره کائولن رحمت‌آباد، گردنه ملا احمد نایین، استان اصفهان

نویسندگان

1 دانشگاه اصفهان

2 دانشگاه صنعتی اصفهان

3 دانشگاه تبریز

چکیده

ذخیره کائولن رحمت­آباد در فاصله 25 کیلومتری جنوب­ غربی نایین واقع است. این ذخیره فرآورده دگرسانی سنگ­های آتشفشانی و واحدهای آذرآواری به سن ائوسن است. بررسی­های کانی­شناسی نشان می­دهند که کائولینیت، ژاروسیت، هماتیت، کوارتز، کلسیت، آنورتیت، آلونیت، دیاسپور، کلریت، مونت­موریلونیت، ایلیت، آلبیت، اورتوکلاز، هالیت، سانیدین، گوتیت، مالاکیت، آزوریت و سرسیت از کانی­های سنگ­ساز این ذخیره هستند. بر اساس نتایج گرماسنجی روی کلریت­های حاصل از دگرسانی، دمای سیالات مسوول دگرسانی از 25/98 تا 04/321 درجه سانتی­گراد بوده است. بر پایه بررسی­های زمین­شیمیایی، فرایند تبدیل سنگ­های آتشفشانی و آذرآواری به کائولن با غنی­شدگی Rb، Cs، Ba، Sr، Nb، Hf، Zr، Y، Th، Al و U، شستشو-تثبیت Si، Ca، Ti، Na و P < /span> و تهی­شدگی Fe، K، Mn، Mg، K، Cr، Ni و REEs همراه بوده است. از سیماهای زمین­شیمیایی مشخص دیگر می­توان به نسبت­های بالای (La/Lu)N و بالا بودن مقادیر Ba و Sr نسبت به مقادیر La، Ce و Y اشاره نمود. همچنین در ناحیه مورد بررسی، تغییرات بی­هنجاری­های Eu و Ce به ترتیب توسط درجه دگرسانی فلدسپارها و تغییر درجه اکسایش محیط کنترل شده­اند. به نظر می­رسد که توسعه ذخیره کائولن در رحمت­آباد توسط همپوشی فرآیند درون­زاد توسط فرآیند برون­زاد در منطقه حاصل شده است. اختلاف در میزان شدت دگرسانی مواد منشاء، شیمی محلول­های دگرسان کننده، جذب سطحی، ترکیب در ساختار بلوری، اختلاف در درجه کمپلکس­شدن با لیگندهای سولفاتی، کلریدی و فلوریدی و تفاوت در میزان پایداری کانی­های اولیه در برابر دگرسانی شش عامل مهم کنترل کننده تحرک، توزیع، و تمرکز عناصر در ذخیره کائولن منطقه رحمت­آباد هستند.       

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogy and geochemistry of Rahmatabad Kaolin deposit, ghaut of Mollaahmad Nain, Isfahan Province

نویسندگان [English]

  • mohammadali Makizadeh 1
  • khadijeh mari 1
  • Mahin Mansouri Esfahani 2
  • shirin Fatahi 3
1 University of Isfahan
2 Isfahan University of Technology
3 University of Tabriz
چکیده [English]

The Rahmatabad Kaolin deposit is located about 25 km southwest of Nain. This deposit is formed by alteration process from Eocene volcanic rocks and pyroclastic units. Mineralogical studies display that the kaolinite, jarosite, hematite, quartz, calcite, anortite, alunite, diaspore, chlorite, montmorillonite, illite, albite, orthoclase, halite, sanidine, goethite, malachite, azurite and sericite are the rock-forming minerals in this deposit. Based on geothrmometry data on the chlorite which produced by alteration process, the temperature of hydrothermal fluid formed this deposit has been between 98.25 oc to 321.04oc. According to geochemical studies, the alteration process of volcanic and pyroclastic rocks to Kaolin have been accompanied by enrichment of Rb, Cs, Ba, Sr, Nb, Hf, Zr, Y, Th, Al and U; leaching-fixation of Si, Ca, Ti, Na and P; and depletion of Fe, Mn, Mg, K Cr, Ni and RREs. Furthermore, the geochemical data can be refer to high (La/Lu)N, and high Sr, Ba values than to La, Ce and Y. Also Ce and Eu anomalies in the studied area were controlled by degree of feldspar alteration as well as changing the in degree of oxidation of environment respectively.  It seems that the development of the Rahmatabad Kaolin deposit was supported by mixing of two hypogene and supergene processes. The discrepancy in the rate of alteration intensity of the source materials, chemistry of altering solutions, adsorption, incorporation in crystal lattice, difference in degree of complexation with sulfate, chloride, and fluoride ligands and difference in the stability scale of primary minerals against the alteration are considered as six important factors for controlling the mobilization, distribution, and concentration of elements in the Rahmatabad Kaolin deposit. 

کلیدواژه‌ها [English]

  • mineralogy
  • Kaolin
  • pyroclastic units
  • mobilization of elements
  • Ghuat of Mollaahmad Nain

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  • تاریخ دریافت: 11 تیر 1404
  • تاریخ بازنگری: 15 بهمن 1404
  • تاریخ پذیرش: 11 تیر 1404

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