نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

سنگ نگاری، شیمی کانی و دما فشارسنجی توده  های نفوذی گابرو-دیوریت منطقه حُرجند، شمال شرق کرمان

نویسندگان
1 دانشگاه شهرکرد، دانشکده منابع طبیعی و علوم زمین
2 دانشگاه شهید باهنر کرمان، گروه زمین‌شناسی
چکیده
سنگ­های گابرو-دیوریتی منطقه حرجند در شمال شرق کرمان و در بلوک پشت بادام از خرده قارۀ ایران مرکزی به درون واحدهای رسوبی سری دزو با سن پرکامبرین-کامبرین نفوذ کرده­اند. کانی­های اصلی این سنگ­ها شامل آمفیبول، پیروکسن و پلاژیوکلاز می­شود و بافت­های گرانولار و پوئی­کلیتیک در آنها غالب هستند. بررسی شیمی کانی­ها نشان می­دهد ترکیب کلینوپیروکسن­های این سنگ­ها از انواع دیوپسید و اوژیت است. پلاژیوکلازها گسترۀ ترکیب شیمیایی بیتونیت (An75.2Ab23.8Or1.1) تا آندزین (An40.2Ab55.9Or3.9) دارند. آمفیبول موجود در این سنگ­ها ماگمایی و کلسیمی و دارای ترکیب شیمیایی مگنزیوهاستنگزیت است. دماسنجی با استفاده از روش میزان تیتانیوم در ترکیب آمفیبول، میانگین دمای تبلور حدود 769 تا 889 درجۀ سانتی­گراد نشان می­دهد. هم‌چنین براساس زمین دماسنجی جفت کانی آمفیبول-پلاژیوکلاز هم‌زیست، دمای بین 793 تا 896 درجۀ سانتی­گراد برای تبلور این دو کانی تعیین شده است. نتایج به‌دست آمده از زمین فشارسنجی نشان از تبلور بلورهای آمفیبول در فشار حدود 3/6 تا 8/8 کیلوبار که معادل با عمقی در حدود 23 تا 30 کیلومتری زمین است. بررسی­های شیمی کانی­ها بیان‌گر تشکیل این سنگ­ها از ماگمایی با سرشت آلکالن تا ساب آلکالن و مرتبط با جای‌گاه زمین­ساختی درون صفحه­ای است.




کلیدواژه‌ها

عنوان مقاله English

Petrography, Mineral Chemistry and Geothermobarometry of Gabbro-Diorite intrusions from Hurjand Area, NE of Kerman

نویسندگان English

Mohammad Reza Ghasempour 1
Nahid Shabanian 1
Alireza Davoudian 1
Hesam Moeinzadeh 2
1 Faculty of Natural Resources and Earth Sciences, Shahrekord University
2 Department of Geology, Shahid Bahonar University of Kerman
چکیده English

Gabbroic-dioritic rocks of Hurjand area in northeast of Kerman within the Posht-e-Badam block of the Central Iran microcontinent have intruded into the Precambrian-Cambrian sedimentary units of Desu Series. Amphibole, pyroxenes and plagioclase are the main minerals with granular and poikilitic textures in these rocks. Mineral chemistry studies show that clinopyroxene composition is augite and diopside. The plagioclase has a range of chemical composition from bytownite (An75.2Ab23.8Or1.1) to andesine (An40.2Ab55.9Or3.9). Amphibole crystals present in these rocks are calcic and magmatic types with chemical composition of magnesio-hastingsite. Geothermometry of Ti content in amphibole composition shows a range of crystallization temperatures of 769 to 889°C. Geothermometry of coexisting amphibole-plagioclase pair shows the crystallization temperature of 793 to 896°C. Results of the geobarometry show that amphibole crystals formed at pressure of about 6.3 to 8.8 kbar, equivalent to the depth of 23 to 30 km. Mineral chemistry studies indicate the formation of these rocks from magma of alkaline to sub-alkaline nature related to intra-plate tectonic setting.




کلیدواژه‌ها English

Gabbro-Diorite
Mineral chemistry
Geothermobarometry
Amphibole
Hurjand
Kerman
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