ژئوشیمی سرپانتینیت¬های قطعه مرکزی خط درز نئوتتیس (از شمال¬غرب ایران تا زاگرس عراقی و شرق آناتولی)
الموضوعات :
1 - دانشگاه ارومیه
2 - دانشگاه تبریز
الکلمات المفتاحية: افیولیت, پریدوتیت, فرورانش, سرپانتینیت, نئوتتیس.,
ملخص المقالة :
فرورانش و بسته شدن اقیانوس وسیع نئوتتیس مابین ورقه¬های عربی و اوراسیایی آثار افیولیتی متعددی بجای گذاشته که موقعیت کم‌نظیر ایران در بخش مرکزی آن قابل ملاحظه است. کمبود اطلاعات، درست در مرز ایران با عراق و ترکیه به دلیل ملاحظات امنیتی تاکنون مانع بررسی اجمالی این خط درز در منتهی¬الیه شمال¬غربی ایران شده است. افزودن افیولیت گیسیان در جنوب ارومیه به‌عنوان حلقه گم شده در این امتداد می¬تواند تا حدودی این نبود اطلاعات را پوشش دهد. مطالعه تطبیقی شیمی سنگ¬کل سرپانتینیت¬های بخش مرکزی افیولیت¬های نئوتتیس با در نظر گرفتن چندین لکه از ایران (کامیاران، مریوان و گیسیان)، عراق (پنجوین و ماوات) و ترکیه (گولمان و عثمانیه) در این مقاله، بیانگر تعلق آنها به انواع سرپانتینیت فرورانده اعم از تشکیل اولیه در محیط جلوی قوسی یا محیط عمیق اقیانوسی می¬باشد. ترکیب سرپانتینیت¬های قطعه مرکزی خط¬درز، مشابه متوسط سرپانتینیت¬های جهانی است و بیشتر دارای لیزاردیت/کریزوتیل می¬باشند. در همه آنها تهی¬شدگی از منیزیم به سبب دگرسانی کف ¬اقیانوسی طی فرآیندهای سرپانتینی¬شدن روی داده است. همین امر ممکن است منجر به انحراف داده¬ها از بخش پریدوتیت¬های پهنه¬های عمیق اقیانوسی شده باشد. با در نظر گرفتن این نکته فراوانی فلزات واسطه مختصات چنین پهنه¬ای را تأیید می¬کند. بیشتر سرپانتینیت¬های امتداد نام¬برده از نوع فرورانده¬ ارزیابی می¬شوند. باروری مجدد عناصر با شعاع یونی بزرگ، از طریق تبادل سنگ/سیال حین سرپانتینی¬شدن در آنها مشهود است.
المصادر:
فصلنامه پژوهش¬های دانش زمین. 12 (48)، 1-19.
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مؤید، م.، 1381. نگرشی نو بر تکوین و تکامل نئوتتیس و ارتباط آن با ماگماتیسم ترشیری ارومیه-دختر و البرز غربی- آذربایجان. ششمین همایش انجمن زمین¬شناسی ایران. SGSI06-052.
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فصلنامه پژوهش¬های دانش زمین. 12 (48)، 1-19.
میری، م.، ابراهیمی، م. و ویسی نیا، ا.، 1399. بررسی پتروژنز سرپانتینیت¬های پهنه گرماب در پهنه افیولیت کرمانشاه (غرب ایران) با استفاده از شیمی کانی¬ها و نمودارهای فازی. زمین¬شناسی کاربردی پیشرفته، 10 (4)، 651-634.
مؤید، م.، 1381. نگرشی نو بر تکوین و تکامل نئوتتیس و ارتباط آن با ماگماتیسم ترشیری ارومیه-دختر و البرز غربی- آذربایجان. ششمین همایش انجمن زمین¬شناسی ایران. SGSI06-052.
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ویسی نیا، ا.، ابراهیمی، م. رحیم زاده، ب. و اسمعیلی، ر.، 1400. بررسی ژئوشیمی مجموعه افیولیتی گرماب، شمال شرق کامیاران: سیر تحولی مورب به قوس اقیانوسی. علوم زمین، 31(1)، 148-135.
Ali, S. A., Buckman, S., Aswad, K. J., Jones, B. G., Ismail, S. A. and Nutman, A. P., 2012. Recognition of Late Cretaceous Hasanbag ophiolite-arc rocks in the Kurdistan region of the Iraqi Zagros thrust zone: a missing link in the paleogeography of the closing Neo Tethys Ocean. Lithosphere, 4, 395-410.
Ao, S., Xiao, W., Jafari, M. K., Talebian, M., Chen, L., Wan, B., Ji, W. and Zhang, Z., 2016. U-Pb zircon ages, field geology and geochemistry of the Kermanshah ophiolite (Iran): from continental rifting at 79 Ma to oceanic core complex at ca. 36 Ma in the southern NeoTethys. Gondwana Research, 31, 305-318.
Ao, S., Jafari, M. K. and Xiao, W., 2017. U-Pb zircon age of the Piranshahr ophiolite in NW Iran: enigmatic relict of an arc in NeoTethys before the Arabia and Eurasia collision. GSA Annual Meeting in Seattle, Washington, USA. DOI:10.1130/abs/2017AM-302778.
Ao, S., Mao, Q. Jafari, M. K. and et al., 2020. U–Pb age, Hf–O isotopes, and geochemistry of the Sardasht ophiolite in the NW Zagros orogen: Implications for the tectonic evolution of NeoTethys. Geological Journal, 1–15. DOI: 10.1002/gj.4011.
Aqrawi, A. M., Elias, E.M. and Mohammed, Y. O., 2007. Oxygen and Hydrogen Isotope Study of Serpentinized Peridotite Rocks, Thrust Zone, North East Iraq. Iraqi Journal of Earth Sciences, 7 (1), 13-20.
Aswad, K. J., Aziz, N. R. H. and Koyi, H. A., 2011. Cr-spinel compositions in serpentinites and their implications for the petrotectonic history of the Zagros suture zone, Kurdistan Region, Iraq Geological Magazine, 148, 802-818.
Bach, W. and Klein, F., 2009. The petrology of seafloor rodingites: insights from geochemical reaction path modelling. Lithos 112, 103–117.
Beard, J.S., 1986. Characteristic mineralogy of arc-related cumulate gabbros: implications for the tectonic setting of gabbroic plutons and for andesite genesis. Geology, 14, 848-851.
Bilici, Ö. and Kolayli, H., 2018. Mineral records of the pyroxenites formed within harzburgites (Ulaş, Sivas, Turkey): implications on petrogenesis and tectonic setting. Turkish Journal of Earth Sciences, 27, 384-404.
Bogolepov, V.G., 1970. Problem of serpentinization of ultrabasic rocks: International Geology Review, 12, 421–32.
Boudier, F., Baronnet, A. and Mainprice, D., 2009. Serpentine mineral replacements of natural olivine and their seismic implications: Oceanic lizardite versus subduction-related antigorite: Journal of Petrology, 51(1-2), 495-512.
Cannaò, E., Scambelluri, M., Agostini, S., Tonarini, S. and Godard, M., 2016. Linking serpentinit geochemistry with tectonic evolution at the subduction plate-interface: The Voltri Massif case study (Ligurian Western Alps, Italy): Geochimica et Cosmochimica Acta, 116, 115-133.
Deschamps, F., Godard, M., Guillot, S. and Hattori, K., 2013. Geochemistry of subduction zone serpentinites: A review. Lithos, 178, 96-127.
Dilek, Y., Imamverdiyev, N. and Altunkaynak, S., 2010. Geochemistry and tectonics of Cenozoic volcanism in the Lesser Caucasus (Azerbaijan) and the peri-Arabian region: collision-induced mantle dynamics and its magmatic fingerprint. International Geology Review, 52, 536–578. https://doi.org/10. 1080/00206810903360422
Eren Rizeli, M, Wang, K.L., Bingol, A.F. and Beyarslan, M., 2016. Mineral chemistry and petrology of mantle peridotites from the Guleman ophiolite (SE Anatolia, Turkey): evidence of a forearc setting: 13th International Conference on Gondwana to Asia, At: Trivandrum, India Volume: 22.
Evans, B. W., Hattori, K. and Baronnet, A., 2013. Serpentinite: what, why, where?: Element, 9(2), 99-106.
Green II, H.W., 2007. Shearing instabilities accompanying high-pressure phase transformations and the mechanics of deep earthquakes. Proceedings of the National Academy of Sciences, 104, 9133–9138.
Günay, K. and Çolakoğlu, A., 2016. Spinel compositions of mantle-hosted chromitite from the Eastern Anatolian ophiolite body, Turkey: Implications for deep and shallow magmatic processes. Ore Geology Reviews, 73, 29–41.
Günay, K., Çolakoğlu, A.R. and Çakır, Ü., 2012. Geochemical properties and rodingitization of diabase dykes cutting peridotites in Yüksekova complex (Özalp, Van — Turkey). Bulletin of Mineralogy and Exploration, 144, 1–22.
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