ویژگی ژئوشیمیایی سنگ های آذرین مرتبط با کانسارطلای اپی ترمال لوبین – زرده ، شمال غرب ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دکترا، گروه زمین‌شناسی، دانشکده علوم، دانشگاه لرستان، خرم‌آباد، ایران

2 استاد، گروه زمین‎شناسی، دانشکده علوم، دانشگاه لرستان، خرم‌آباد، ایران

3 دانشیار، گروه زمین‎شناسی، دانشکده علوم، دانشگاه لرستان، خرم‌آباد، ایران

چکیده

چکیده: منطقه مورد مطالعه در زون البرز غربی-آذربایجان و 45 کیلومتری شمال شرق زنجان واقع است. سنگ های کوارتزمونزونیت و توف برش داسیتی میزبان اصلی کانسار لوبین –زرده میباشد. این سنگها با سرشت بیشتر کالک آلکالن پتاسیم بالا تا شوشونیتی، از نوع I ، متاآلومینوس و متعلق به سری منیزیمی از نوع کردیلرایی میباشد. سنگهای توده نفوذی غنی از عناصر LILE وLREE وتهی از عناصر HFSE،HREES ، MREES و Y هستند. شکل تقعر بطرف بالا ( Listric-shaped) نمودارالگوی عناصر نادر خاکی و نسبت میانگین La/Yb سنگ میزبان نشان دهنده مقدار آب بیشتر ،fO2 بالای ماگما و تفریق هورنبلند میباشد. مقادیر ISr نسبتا پایین تا متوسط7047/0-7051/0و مقادیر εNd(t=36Ma) برابر 39/0 تا 1/2 و سن های TDM از GM 69/0 – 06/1 با نسبت ایزوتوپی 206Pb/204Pb)i) برابر 49/18 – 68/18 ، 207Pb/204Pb)i) برابر 58/15 -61/15 و 208Pb/204Pb)i) برابر 33/38 – 77/، است. بر اساس شواهد بافتی، داده های ژئوشیمیایی و ایزوتوپی رادیوژنیک سنگهای میزبان کانسار لوبین-زرده با ترکیب ژئوشیمیایی سنگ میزبان کانسارهای پرفیری و اپی ترمال در زون ارومیه دختر، البرز غربی- آذربایجان(ارسباران) ،کانسار پانتدی ترکیه مطابقت دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Geochemical characteristics of igneous host rocks associated of Lubin-Zardeh epithermal gold deposit, NW of Iran

نویسندگان [English]

  • SHAHRAM RAHMANI 1
  • Hasan Zamanian 2
  • reza Zarei Sahamieh 3
1 Ph.D., Department of Geology, Faculty of Sciences, Lorestan University, Khoram Abad, Iran
2 Professor, Department of Geology, Faculty of Sciences, Lorestan University, Khoram Abad, Iran
3 Associate Professor, Department of Geology, Faculty of Sciences, Lorestan University, Khoram Abad, Iran
چکیده [English]

Abstract:
The study area is located 45Km NE Zanjan in the Azerbaijan-Western Alborz zone. Quartz-monzonite and dacitic brecciated tuffs are the main host rocks to the Lubin-Zardeh deposit. These rocks are predominantly of K-high calc-alkaline shoshonitic I-type, metaluminous magnesian affinities of Cordilleran type. The intrusive rocks are enriched in LILE, LREE and depleted from HFSE, MREE and HREE and Y. A listric-shaped REE pattern and average La/Yb ratios of host rock indicates higher water content and fO2 in the magma and hornblende fractionation. Their relatively low to moderate ISr values (0.7047–0.7051), positive εNd (t = 36 Ma) values (0.39–2.1) and TDM ages of 0.69 to 1.06 Ga, with Pb isotopic ratios of (206Pb/204Pb) i = 18.49–18.68, (207Pb/204Pb) i = 15.58–15.61 and (208Pb/204Pb) i = 38.33–38.77. Based on textural evidence (coarse amphibole crystals), geochemical data (major, trace and Rare earth elements) and isotopic contents of Pb, Sr-Nd, it is suggested that these rocks correspond to geochemical and isotopic compositions of the host rocks of porphyry and epithermal deposits in the Urmia Dokhtar zone of West Alborz-Azerbaijan (Arasbaran) and Eastern Pontides epithermal deposits, Turkey.

کلیدواژه‌ها [English]

  • Lead
  • strontium-neodymium isotope
  • Quartz-monzonite
  • Lubin-Zardeh
  • West Alborz
کتابنگاری

حسین‎زاده، م. ر.، مغفوری، س.، مؤید، م.، لطفه‎نیا. و حاج‎علیلو، ب.، 1394- سنگ‎شناسی، دگرسانی و کانه‎زایی رگه- رگچه ای چندفلزی (مس- سرب- روی) در منطقه لوبین- زرده شمال خاور زنجان. فصلنامه علوم زمین، سال بیست و چهارم، شماره 96، صص. 41 تا 52.

زمانیان، ح.، رحمانی، ش.، جاننثاری، م. ر.، زارعی سهامیه، ر. و برنا، ب.، 1394- بررسی کانی‏سازی مس- طلا گرانیتویید طارم (شمال زنجان) بر پایه شواهد کانی‎شناسی، ژئوشیمی و میانبارهای سیال. فصلنامه علوم زمین، سال بیست و پنجم، شماره 98، صص. 255 تا 282.

مؤید، م.، 1380- بررسی‎های پترولوژیکی نوار ولکانو- پلوتونیک ترشیری البرز باختری- آذربایجان با نگرشی بر منطقه هشتجین، رساله دکترای زمین‎شناسی دانشگاه تبریز، صص. 94 تا 125.

 

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