Source: http://www.gsjournal.ir/article_80138_8823.html
Timestamp: 2019-04-19 03:00:51+00:00

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توده نفوذی لویکوگرانیتی قالقاچی به وسعت تقریبی 2 کیلومتر مربع، در باختر دریاچه ارومیه و 70 کیلومتری شمال شهر ارومیه قرار گرفته است. این توده به­صورت یک استوک کوچک در درون سنگ­های دگرگونی منسوب به پرکامبرین شامل گنایس، شیست و آمفیبولیت نفوذ کرده است. این محدوده شمالی­ترین بخش زون سنندج- سیرجان است. سن لویکوگرانیت قالقاچی برای اولین بار به­روش LA-ICP-MS دانه­های زیرکن، حدود Ma 8/3 ± 6/558 تعیین شد که فعالیت ماگمای اسیدی در پرکامبرین پایانی را نشان می­دهد و بیانگر حضور پی­سنگی مشابه پی‌سنگ پان‌آفریقای ایران مرکزی در شمال باختری­ترین بخش ایران است. حضور هسته­های قدیمی با سن بین 900 تا 2500 میلیون سال در برخی دانه­های زیرکن، بیانگر حضور سنگ منشأهای قدیمی­تر در منطقه است. این سنگ دارای مقدار = -4.3 eNd (t) با TDM= 1.61 است. این داده­ها گویای تشکیل آن از ذوب بخشی پوسته اولیه (با سن پالئوپروتروزوییک) در طول تشکیل سپر عربی در نئوپروترزوییک- کامبرین است. مقادیر 87Sr/86Sr و εNd سنگ کل و مقادیر Th/U در زیرکن­های این توده، مشارکت مواد پوسته­ای و اندکی ماگمای گوشته­ای را در ژنز این سنگ­ها در طول باز شدگی اقیانوس پالئوتتیس نشان می­دهد.
The Ghalghachi leucogranite intrussion with approximately 2 Km2 is located in west Urmia Lake and 70 Km north of Urmia city. This intrussion in form of small stock has intruded into Precambrian metamorphic rocks including gneiss, schist and amphibolite. This area is part of the Sanandaj-Sirjan zone in northwestern of Iran. This is the first time that age of leucogranite was determined by LA-ICP-MS zircon grains 558.6 ± 3.8 Ma that indicates acidic magmatic activity and the presence of Pan-African basement similar to the central Iran. The presence of older cores in some of zircon grains with age between 900 to 2500 Ma suggest the presence of older rocks in the study area. The rock show negative initial eNd (t) values of -4.3 with TDM 1.61 that are consistent with partial melting of a primary crust (with Paleoprotrozoic age) that was formed during the Neoproterozoic the same as Arabian Shield. The 87Sr/86Sr and εNd of whole rock and Th/U values in zircons show the involvement of more crustal and less mantle components, during the opening of Paleotethys Ocean.
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