بررسی شیمی کانی، همبرزایی و سن‌سنجی سنگ‌های دیابازی گنبدهای نمکی سازند هرمز، جنوب ایران (استان هرمزگان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه هرمزگان

2 دانشگاه شهید باهنر

چکیده

سنگ­های دیابازی سازند هرمز، دستخوش انواع فرآیندهای ثانویه دگرسانی و دگرگونی رخساره­ی شیست سبز تا اوایل رخساره­ی آمفیبولیت شده­اند. این سنگ­ها، در نتیجه فرآیند دگرنهادی نفوذی و دگرسانی گرمابی، دگرسان و به دلیل سیال­های آبدار غنی از CO2 و برهم­کنش سنگ-سیال، دگرگون شده­اند. کانی­های فلدسپات، پیروکسن، الیوین، آپاتیت، روتیل، مگنتیت و پیریت، جزء کانی­های ماگمایی اولیه­ی این سنگ­ها و سایر کانی­های موجود در این سنگ­ها، فراورده تبدیل کانی­های اولیه در اثر دگرسانی و دگرگونی گرمایی هستند. فلدسپات­ها به لابرادوریت، آلبیت و ارتوکلاز تفکیک می­شوند. لابرادوریت و آلبیت در دمای کمتر از 700 درجه­ی سانتی­گراد و فشار کمتر از 6 کیلوبار متبلور شده­اند که شرایط دمای باز تبلور آنهاست. ارتوکلاز در 700 درجه­ی سانتی­گراد، 6 کیلوبار و بیش از 1000 درجه­ی سانتی­گراد، بیش از 7 کیلوبار متبلور شده­اند و جزء کانی­های ماگمایی است. کلینوپیروکسن­ها به اوژیت و دیوپسید تفکیک می­شوند که در دمای 1100 تا 1300 درجه سانتی­گراد متبلور شده­ و جزء کانی­های ماگمایی هستند. پیروکسن‌ها نیمه قلیایی تا قلیایی هستند و در محیط بازالت­های تولئیتی درون­صفحه­ای یا بازالت­های کف­اقیانوسی تشکیل شده­اند. پلاژیوکلاز فلدسپات­ها و کلینوپیروکسن­ها شرایط اکسیدان را نشان می­دهند. با توجه به زیرکن­های تجزیه شده­ی دیابازهای گنبد نمکی بند معلم (Ma 4/6 ± 4/539) و گنبد نمکی چمپه (Ma 1/6 ± 5/543)، سن تبلور و تشکیل این سنگ­ها، کامبرین پیشین است. بیشتر این زیرکن­ها، خاستگاه ماگمایی دارند. سن این دیابازها نشان می­دهد که نفوذ آنها همزمان و/یا پس از شروع کافت‌شدگی پیشین زیستی نو تا کامبرین پیشین بخش شمالی صفحه­ی عربستان و رسوب­گذاری سازند هرمز در حوضه­ی خلیج فارس بوده است.     

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry, paragenesis and geochronological studies of the Hormuz Formation diabase rocks in the salt domes of sothern Iran, Hormozgan Province

چکیده [English]

The studied diabase rocks of the Hormuz Formation have undergone a variety of secondary processes and greenschist facies to amphibolite facies metamorphism. These rocks are metasomatized due to the effect of infiltrating metasomatism and hydrothermal alteration and are metamorphed due to CO2-rich aqueous fluids and rock-fluid interaction. Feldespat, pyroxene, olivine, apatite, rutile, magnetite and pyrite are the primary magmatic minerals present in these rocks and other minerals, are products of the transformation of the primary minerals due to metasomatism and thermal metamorphism. Feldspars are labrador, albite and orthoclase. Labrador and albite were crystalized at tempretures of <700 and pressures of <6 kbar which is their recrystallization tempreture. Orthoclase was crystalized at tempretures and pressures of 700, 6 kbar and >1000, >7 kbar and is a magmatic mineral. Clinopyroxens are augite and diopside and were crystalized at 1100 to 1300 and are magmatic minerals. Pyroxenes are subalkaline to alkaline and were formed within plate tholleitic basalt or oceanic floor basalt environment. Plagioclase and pyroxene minerals show oxidation conditions. According to the analyzed zircons from Band-e Moullem (539/4 ± 6/4 Ma) and Champeh (543/5 ± 6/1 Ma) salt dome diabase, these rocks have been crystalized and formed during Early Cambrian time. In addition, most of these zircons have a magmatic origin. This estimated age suggests that the intrusion of these diabase, occurred during and/or after the Neoproterozoic to Early Cambrian rifting of the northern part of the Arabian plate and the sedimentation of the Hormuz Formation in the Persian Gulf Basin.

کلیدواژه‌ها [English]

  • salt dome
  • Hormuz Formation
  • Diabase
  • Mineral chemistry
  • paragenesis
  • geochronology. لطفاَ در مقاله ارسالی به نکات زیر توجه فرمائید

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  • تاریخ دریافت: 17 اردیبهشت 1396
  • تاریخ بازنگری: 08 شهریور 1396
  • تاریخ پذیرش: 01 مهر 1396

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