بررسی زمین زمان‌سنجی گنبد آتشفشانی بهلول داغی، شمال تبریز: برپایه داده‌های سن‌سنجی Ar 39Ar/40 بیوتیت

نوع مقاله : مقاله پژوهشی

نویسنده

دانشگاه محقق اردبیلی

چکیده

حوضه تبریز دارای فعالیت‌های گسترده آتشفشانی سنوزوئیک و کواترنری بوده است و در پهنه برخوردی بین ورقه عربستان و اوراسیا قرار دارد. سازندهای موجود در منطقه از سازندهای رسوبی- تخریبی به سن میوسن (سازند قرمز بالایی) به همراه آتشفشانی‌های داسیتی جوان‌تر تشکیل شده­اند. گنبد آتشفشانی بهلول داغی در جنوب روستای اسپیران از نظر ترکیب بین داسیت تا ریولیت متغیر بوده و معمولاً دارای بافت پورفیری با درشت بلور‌هایی از کوارتز، پلاژیوکلاز، سانیدین، هورنبلند و بیوتیت است. شواهد صحرایی آشکارا نشان می‌دهد که آنها به داخل توالی سازند قرمز بالایی نفوذ کرده‌اند و بنابراین جوان‌تر از این واحدها هستند. به منظور تعیین سن دقیق، بررسی­های سن­سنجی آرگون- آرگون بر هفت بلور بیوتیت جدا شده از نمونه داسیتی انجام شد. در این بررسی، طیف سن­سنجی نعلی­شکلی (U شکل) با سن­های آشکار شده بالا نسبت به نمودار تشکیل شد. این شکل نعل­­مانند ناشی از بالا بودن مقادیر اولیه آزادسازی آرگون است که به وسیله کاهش سن در یک نمودار به خوبی تعریف شده دنبال می­شود و با توجه به آن سن دقیق نمونه آتشفشانی مشخص می شود که برای نمونه­های مورد بررسی Ma 15/0±05/2 تعیین شد.    

کلیدواژه‌ها

عنوان مقاله [English]

Geochronology investigation of the Bahlul Daghi volcanic dome, north of Tabriz, by application of 40Ar/39Ar dating on biotite

نویسنده [English]

  • Seyedeh Narges Sadati
چکیده [English]

Tabriz Basin has had extensive Cenozoic and Quaternary volcanic activity and lies in NW Iran within the collision zone of the Arabian and Eurasian plates. Formations in the region consist of siliciclastic rocks of the Miocene age (Upper red formation), along with younger dacite volcanic rocks. The Bahlul Daghi volcanic dome in the south of Spiran is variable in terms of the composition between dacite to rhyolite. It usually contains porphyry texture with phenocrysts of quartz, plagioclase, sanidine, hornblende and biotite. Field observations clearly show that they penetrate into the sequence of the Upper Red Formation, so they are younger than these units. In order to determine the exact age of volcanic rocks, Ar-Ar age dating was performed on seven biotite crystals isolated from the dacite sample. This analysis yielded saddle-shaped age spectra with initially old apparent ages followed by decreasing to a well defined plateau age, from which a precise age for volcanic rocks can be determined. Our new 40Ar/39Ar isochron results date this volcanic rocks 2.05±0.15 Ma.

کلیدواژه‌ها [English]

  • dating
  • excess argon
  • plateau
  • Spiran
  • Bahlul Daghi
  • Tabriz

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  • تاریخ دریافت: 03 اردیبهشت 1397
  • تاریخ بازنگری: 07 شهریور 1397
  • تاریخ پذیرش: 07 مهر 1397

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