شیمی کانی گابروهای همسانگرد افیولیت کرمانشاه، شواهدی بر خاستگاه زمین‌ساختی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه بوعلی‌سینا

چکیده

 گابروهای همسانگرد افیولیت کرمانشاه شامل طیفی از گابرو، الیوین گابرو، گابرو نوریت، الیوین گابرو نوریت و تروکتولیت هستند که بیشتر متوسط­بلور هستند و از کلینوپیروکسن، پلاژیوکلاز، ارتوپیروکسن، الیوین و به مقادیر کم آمفیبول تشکیل شده­اند. کلینوپیروکسن­ها با ترکیب اوژیت ـ دیوپسید ((91/50-79/45)En، (409/7-638/3) Fsو (47/48-81/43)) Woغنی از کلسیم و فقیر از سدیم (Na2O کمتر از 54/0 درصد وزنی)، با مقدار نسبتاً بالای Mg# (62/85 تا 35/89) و اندک Ti (TiO2 کمتر از 28/0 درصد وزنی) مشخص می­شوند. پلاژیوکلازها بیشتر از نوع بیتونیتی هستند و ترکیب آنها از آنورتیت غنی است ((15/90-51/70) An، (02/29-62/9) Ab و (63/0-00/0)Or). مؤلفه فورستریتی الیوین­ها در گستره 82/84-07/80 تغییر می­کند. اغلب ارتوپیروکسن­ها ترکیب انستاتیتی دارند و گستره ترکیبی آنها ( (94/84-27/78) En، (07/20-0/13) Fs و (36/3-43/1)Wo) است. آمفیبول­ها از منیزیم غنی هستند (ترمولیت، اکتینولیت و منیزیوهورنبلند) و Mg# آنها در گستره 35/64 تا 86/84 تغییر می­کند. وجود الیوین­ها و پیروکسن­های با منیزیم بالا، پلاژیوکلازهای کلسیک و نیز وجود کانی آمفیبول در گابروها نشان دهنده تشکیل آنها در محیط زمین­ساختی مربوط به فرورانش است. نمودارهای تعیین خاستگاه زمین­ساختی کلینوپیروکسن­ها، ویژگی­های شاخص جزایر کمانی خاستگاه ماگما را نشان می­دهند. براساس نتایج، افیولیت کرمانشاه در محیط پهنه ابرفرورانشی در شاخه جنوبی نئوتتیس تشکیل شده است.      

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry of isotropic gabbros from the Kermanshah ophiolite: Evidence for it's tectonic setting

نویسندگان [English]

  • Farhad Aliani
  • Zainab Daraeezadeh
Bu -Ali Sina University
چکیده [English]

Isotropic gabbros of Kermanshah ophiolite include olivine gabbro, gabbro, gabbronorite, olivine gabbronorite and troctolite. The isotropic gabbros are medium to fine grained with euhedral to subhedral orthopyroxenes, clinopyroxenes and subhedral plagioclase, olivine together with rare amphiboles. Mineral chemistry of isotropic gabbros reveal that the clinopyroxenes are diopsidic to augitic in composition within the compositional ranges of En(50.91–45.79), Fs(7.41–3.64), and Wo(48.5–43.81). They are Ca-rich and Na poor (Na2O < 0.54 wt%) characterized by high-Mg (Mg# 85.62–89.35) and low-Ti (TiO2 < 0.28 wt%) contents. Plagioclases are bytownite in compositions (An(70.51–90.15), Ab(9.62-29.02) and Or (0/00-0.63), orthopyroxene are mostly enstatites within the compositional ranges of En(78.27-84.94), Fs(13.0-20.07) and Wo(1.43-3.36), olivine, forstrite and amphiboles are Mg-rich (tremolite, actinolite to actinohornblendes) with Mg# (64.35-84/86). The presence of highly magnesian olivines (Fo 80.07–84.82), clinopyroxenes (Mg# 85.62–89.35), and orthopyroxenes (Mg# 79.59–85.72) as well as highly calcic plagioclases (An 70.51–90.15) and amphiboles in the isotropic gabbros indicates a subduction-related tectonic environment. The tectonic discrimination plots of clinopyroxene data indicate island arc signature of the source magma. The results of studies confirm that the Kermanshah ophiolite formed in a suprasubduction zone environment in the southern branch of Neotethys

کلیدواژه‌ها [English]

  • Kermanshah ophiolite
  • Isotropic gabbro
  • Mineral chemistry
  • suprasubduction zone

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  • تاریخ دریافت: 07 شهریور 1396
  • تاریخ بازنگری: 08 آذر 1396
  • تاریخ پذیرش: 13 دی 1396

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