بررسی شرایط تشکیل و عوامل رنگزا در مرمراونیکس‌های ایران بر پایه زمین‌شیمی و میانبارهای سیال

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران

10.22128/ijcm.2026.3159.1020

چکیده

مرمراونیکس‌ها به عنوان یکی از انواع سنگ‌های کربناتی در اثر عملکرد چشمه‌های آبگرم آهک‌ساز، به‌وجود می­آیند. تشکیل مرمر در چشمه‌های تراورتنی به صورت درجازا و شیمیایی است. این سنگ‌ها از نظر ساخت، بافت و ویژگی­های فیزیکوشیمیایی متفاوت از سایر مرمرهای دارای خاستگاه دگرگونی هستند، در این پژوهش، این دو نوع سنگ از نظر واژه‌شناسی از هم تفکیک شده و سپس شرایط تشکیل مرمر در چشمه‌های تراورتنی بررسی شده است. کنار هم بودن سنگ‌های آتشفشانی جوان و گسل‌های متعدد با نهشته‌های تراورتن و اونیکس منطقه نشانگر عملکرد مؤثر همزمانی فعالیت ماگمایی و زمین ساخت پلیوکواترنری در تشکیل این ذخایر ارزشمند است. در این پژوهش مناطق قروه، نقده، بورق و آذرشهر از نظر موارد یاد شده بررسی شده­اند. تعیین غلظت عناصر خاکی نادر (REE) نمونه‌های انتخابی مرمراونیکس گویای نقش موثر این عناصر در رنگزایی با طیف‌های ویژه رنگی است. اکسیدآهن مهمترین عنصر رنگزا در مرمراونیکس‌های با طیف رنگی سبز است. بررسی میانبارهای سیال نشان داد که دمای همگن­شدگی تبدیل بخار به مایع 280-132 درجه سانتی‌گراد و مقدار شوری نمونه‌ها در گستره 98/9-90/2 درصد وزنی Nacl متغیر است. نتایج این بررسی­ها نشان دهنده خاستگاه جوی، دگرگونی و آب دریا برای شکل­گیری سیال کانه‌ساز در نمونه‌های‌ مورد بررسی است. محیط تشکیل نمونه‌های مورد بررسی در گستره کانسارهای فراگرمایی است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the formation conditions and coloring agents in onyx marbles of Iran based on geochemistry and fluid inclusion.

نویسندگان [English]

  • Bahman Rahimzadeh
  • Azadeh Ebrahimi Ardekani
Department of Economic Geology and Hydrogeology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Onyx Marbles are formed as a type of carbonate rock through the action of calcareous hot springs. The formation of Onyx marble in travertine springs occurs in autogenic and through chemical processes. These rocks differ from other marbles of metamorphic origin in terms of structure, texture and physicochemical characteristics. This article aims, first, to distinguish these two types of rocks terminologically and second, to investigate and explore the conditions of marble formation in travertine springs.In this research, the areas of Qorveh, Naqadeh, Burq and Azarshahr were studied to investigate the mentioned objectives.Determining the concentration of Rare Earth Elements (REE) in selected onyx marble samples confirms the effective role of these elements in creating coloration with specific color spectra. The results of these studies indicate atmospheric, metamorphic and seawater origins for the ore-forming fluids in the examined samples.The formation environment of the studied samples falls within the range of epithermal deposits.

کلیدواژه‌ها [English]

  • Onyx marble
  • Sanandaj-Sirjan zone
  • Pelio-quaternary volcanism
  • Travertine forming spring
  • coloring agents
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