دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

شواهد رسوب­گذاری برخورد پالئوتتیس در ارتباط با فازهای زمین‌ساختی و جغرافیای‌ دیرینه رشته‌کوه بینالود (منطقه طرقبه: شمال‌شرق ایران، جنوب‌غرب مشهد)

نویسندگان
1 دانش‌آموخته کارشناسی‌ارشد، گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه فردوسی مشهد، مشهد، ایران
2 استاد گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه فردوسی مشهد، مشهد، ایران
3 گروه زمین‌شناسی، دانشگاه پیام نور مرکز طبس، مدیر ژئوپارک جهانی یونسکو طبس، طبس، ایران
4 کارشناس مسئول میراث زمین‌شناختی، ژئوسایت‌ها و حفاظت زمین‌شناختی ژئوپارک جهانی یونسکو طبس، طبس، ایران
چکیده
رشته کوه بینالود با امتداد WNW-ESE در شمال‌شرق ایران محلی است که به خوبی تمام شواهد ساختاری برخورد پالئوتتیس را درخود جای‌ داده است. پیش از این مطالعات متعددی در مورد تنش‌دیرین و ارتباط آن با تکتونیک و رسوب­گذاری پالئوتتیس انجام شده که وجه تمایز این پژوهش ارتباط دادن انطباق جهت‌‌‌‌‌‌‌های استرس اصلی بدست آمده با جهت استرس در مقیاس جهانی است. از این‌رو، پس از مطالعات میدانی در منطقه طرقبه در واحدهای دگرگونی به سن پرموتریاس، گرانیتی به سن تریاس فوقانی- اوایل ژوراسیک و کنگلومرایی به سن ژوراسیک تعداد سه فاز تفکیک گردید. فاز اول تنش با آزیموت 32/335 مربوط به سیمرین و بسته شدن پالئوتتیس، فاز دوم با آزیموت 25/047 مربوط به آلپ میانی و همزمان با همگرایی نئوتتیس در محل کمان ارومیه دختر و فاز سوم با آزیموت 31/032 مربوط به آلپ پسین همزمان با باز شدن دریای‌سرخ و خلیج‌عدن و حرکت رو به ‌شمال شرق صفحه عربستان به سمت ایران رخ داده است. همچنین بررسی نهشته‌های کنگلومرایی ژوراسیک، منجر به شناسایی رخساره‌های سنگی Gcm، Gh و Gt شد که براساس مطالعات پیشین در یک سیستم‌های رسوبی مخروط­افکنه و رودخانه‌های بریده­بریده تحت سیستم فرسایش و رسوب­گذاری در حوضه پیش‌بوم شکل گرفته است.
کلیدواژه‌ها

عنوان مقاله English

Sedimentary evidence of the Paleotethys collision in relation to the tectonic phases and paleogeography of the Binalud Mountain Range (Torqaba region: northeast Iran, southwest of Mashhad)

نویسندگان English

H. R. Ahmadzadeh 1
F. Ghaemi 2
V. yahya Sheibani 3
E. Zamanian 4
1 M. Sc. (graduated), Dept., of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
2 Prof., Dept., of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
3 Dept., of Geology, Payam Noor University, Tabas Center, Director of Tabas Global Geopark, Tabas, Iran
4 Expert in charge of geological heritage, studies, geosites and geological protection of Tabas Global Geopark, Tabas, Iran
چکیده English

The Binalud mountain range with WNW-ESE extension in northeastern Iran is a place that has well preserved all the structural evidences of the Paleotethys collision. Numerous previous studies have investigated paleostress and its relationship with the tectonics and sedimentation of the Paleotethys. The distinction of this research, however, lies in correlating the orientations of the principal stresses obtained with global-scale stress directions.In this study, after separating the paleostress phases, analyzing the paleogeography, studying the lithic and sedimentary units, and attributing them to the convergence that occurred in the Paleotethys, the forland basin was identified. After field studies in Torqabeh region, three phases were separated in metamorphic units of Permutrias age, granite of Upper Triassic-early Jurassic age and conglomerate of Jurassic age. The first phase of tension with azimuth 32/335 is related to Cimerian and the closure of Palotethys, the second phase with azimuth 25/047 is related to the Middle Alps and coincides with the convergence of Neotethys at the location of Urmia-Dokhtar arc, and the third phase with azimuth 31/032 is related to the late Alps it happened with the opening of the Red Sea and the Gulf of Aden and the north-northeast movement of the Arabian Plate towards Iran. Also, the study of Jurassic conglomerate deposits led to the identification of Gcm, Gh, and Gt rock facies, which, based on previous studies, were formed in an alluvial fan sedimentary system and incised rivers under the erosion and sedimentation system in the forland basin.

کلیدواژه‌ها English

Paleogeography
Forland basin
Binaloud mountain range
Alpine orogen
Cimmerian orogeny
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  • تاریخ دریافت 21 شهریور 1404
  • تاریخ بازنگری 24 مهر 1404
  • تاریخ پذیرش 01 آذر 1404