سنگ‌نگاری و زمین‌شیمی عناصر اصلی و فرعی ماسه‌سنگ‌های سازند قرمز بالایی در بُرش کانسار سرب- روی چهرآباد (شمال‌باختر زنجان) با تاکید بر جایگاه تکتونیکی و برخاستگاه

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد زمین‌شناسی اقتصادی، گروه زمین‌شناسی، دانشکده علوم، دانشگاه زنجان

2 دانشیار، گروه زمین‌شناسی، دانشگاه زنجان، زنجان، ایران

3 استادیار، گروه زمین‌شناسی، دانشگاه زنجان، زنجان، ایران

چکیده

در این پژوهش، داده‌های سنگ‌نگاری و زمین‌شیمیایی عناصر اصلی و فرعی لایه‌های ماسه‌سنگی سازند قرمز بالایی در بُرش کانسار سرب- روی چهرآباد (شمال‌باختر زنجان) جهت تعیین ترکیب سنگ‌شناسی، جایگاه تکتونیکی و سنگ منشأ آن‌ها مورد ارزیابی قرار گرفته است. در این منطقه، سازند قرمز بالایی حداکثر 980 متر ستبرا داشته و بر روی آهک‌های سازند قم قرار گرفته است. براساس مطالعات میکروسکوپی، این ماسه‌سنگ‌ها عمدتاً از ذرات آواری دانه‌ریز تا دانه‌متوسط تشکیل شده و حاوی انواع خُرده‌سنگ‌های رسوبی و دگرگونی (%25)، کوارتز (21 %) و فلدسپات (%10) می‌باشند. براساس مطالعات سنگ‌شناسی، این ماسه‌سنگ‌ها از نوع فلدسپاتیک ‌لیت‌آرنایت تا لیت‌آرنایت (غالباً چرت‌آرنایت) هستند. براساس اجزای اصلی تشکیل‌دهنده و نتایج آنالیزهای زمین‌شیمیایی عناصر اصلی و فرعی، جایگاه تکتونیکی این ماسه‌سنگ‌ها حاشیه‌های فعال قاره‌ای و حوضه‌های فورلندی می‌باشد. داده‌های به‌دست آمده بیانگر سنگ منشأ حدواسط تا فلسیک برای این ماسه‌سنگ‌ها است که تحت تأثیر آب و هوای نیمه‌مرطوب تا نیمه‌خشک و هوازدگی شیمیایی کم قرار داشته‌اند.

کلیدواژه‌ها


عنوان مقاله [English]

Petrography and geochemistry of major and trace elements of the Upper Red Formation at Chehrabad Pb-Zn deposit, northwest of Zanjan, implication for provenance and tectonic setting

نویسندگان [English]

  • Ali Rajabzadeh 1
  • Hossein Kouhestani 2
  • Mir Ali Asghar Mokhtari 2
  • Afshin Zohdi 3
1 MSc. Student of Economic Geology, Department of Geology, University of Zanjan, Zanjan, Iran
2 Associated Professor, Department of Geology, University of Zanjan, Zanjan, Iran
3 Assistant Professor, Department of Geology, University of Zanjan, Zanjan, Iran
چکیده [English]

In this study, petrography and major and minor elements geochemical data are presented for sandstone layers of the Upper Red Formation (URF) in the Chehrabad Pb-Zn deposit (NW Zanjan) to investigate sandstone composition, tectonic setting and their source rock. In this area, URF has 980 m thickness and is conformably overlies the Qom Formation limestones. Based on the microscopic studies, these sandstones mainly composed of fine- to coarse-grained clastic fragments including sedimentary and metamorphic rock fragments (45 %), quartz (38 %) and feldspar (17 %). Based on petrographic studies, these sandstones are feldspathic litharenite and litharenite (mainly chertarenite). Based on the main components and major and minor elements geochemical data, the tectonic setting of these sandstones is an active continental margins and foreland basins. These data represent an intermediate to felsic source rock for these sandstones which was affected by the semi-humid to semi-arid climate and a low chemical weathering.

کلیدواژه‌ها [English]

  • Provenance
  • Climate
  • Tectonic setting
  • Upper Red formation
  • Chehrabad
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