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ترموبارومتری کلسیم آمفیبول در یک گرانیت نوع I با دمای پایین در کاشمر ، ایران | ||
فناوری آموزش | ||
مقاله 8، دوره 1، شماره 2، فروردین 1386، صفحه 121-126 اصل مقاله (1.01 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22061/tej.2007.1252 | ||
نویسنده | ||
ابوالفضل سلطانی* | ||
دانشکده عمران،دانشگاه تربیت دبیر شهید رجایی،تهران،ایران | ||
تاریخ دریافت: 30 اردیبهشت 1399، تاریخ پذیرش: 30 اردیبهشت 1399 | ||
چکیده | ||
گرانیتوئید کاشمر (5/42 میلی لیتر) در صفحه ایران مرکزی ایران (CIP) رخ می دهد. این ماده عمدتاً شامل فلوتین فلزیوم (ASI-1) گرانیت از نوع I و پلوتونهای گرانودیوریت است. تجزیه و تحلیل ریزگردها نشان می دهد که آمفیبول های کاشمر در Ti و (Na + K) A محتویات کم (همه 5/0 apfu) وجود دارد ، که نشان دهنده منیزیم-هورنبند ، یک ماده معدنی مافیک از گرانیت های نوع I با دمای پایین است. همچنین ، محتوای Al2O3 کم است ، که تبلور فشار کم را نشان می دهد. نسبت Mg * بالا (0.60-0.75) و AlVI بسیار کم است ( | ||
کلیدواژهها | ||
شیمی آمفیبول؛ گرانیت نوع I؛ دمای پایین؛ کاشمر؛ ایران | ||
موضوعات | ||
آموزش فنی حرفه ای | ||
عنوان مقاله [English] | ||
Thermobarometry of Ca-amphibole in a Typical Low–temperature I-type Granite from Kashmar, Iran | ||
نویسندگان [English] | ||
A. Soltani | ||
Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran | ||
چکیده [English] | ||
The Kashmar granitoid (42.5 Ma) occurs in NE Central Iran Plate (CIP). It mainly includes felsic metaluminous (ASI ≤ 1) I–type granite and granodiorite plutons. Microprobe analyses show that the Kashmar amphiboles are low in Ti and (Na+K)A contents (all < 0.5 apfu), indicating magnesio–hornblende, a distinct mafic mineral of low–temperature I–type granites. Also, the content of Al2O3 is low, suggesting low–pressure crystallization. The Mg* ratio is high (0.60–0.75) and the AlVI is extremely low (< 0.1 apfu), but Fe3+ is much higher than AlVI, features confirming low–pressure and low–temperature conditions. Utilizing the modern thermo–barometers, the pressures of ≤ 3 kb and average temperature of 655 oC were calculated for Kashmar amphiboles. The attributed log fO2 values are negative, ranging from –16.59 to –19.40 and plotting above the QFM stability. Results of this study propose a thermal boundary of ~700 oC between felsic (~600–700 oC) and mafic (~700–800 oC) low–temperature I–type granites, and reinforce the modern granite subdivision. | ||
کلیدواژهها [English] | ||
Amphibole Chemistry, I–type, Granitoid, Low–temperature, Kashmar, Iran | ||
مراجع | ||
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