ریزرخساره ها، تفسیر شرایط ته نشینی و شناسایی مدل رسوبی نهشته های اواخر پرمین میانی و مرز گوادولوپین- لوپینگین در ناحیه آباده، ایران، باختر پالئوتتیس

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه زمین شناسی، دانشکده علوم پایه، دانشگاه لرستان، خرم آباد

10.22084/psj.2020.18528.1196

چکیده

در ایران رسوبات پرمین- تریاس در دامنه شمال خاوری کوه همبست، در 60 کیلومتری جنوب خاور شهر آباده رخنمون دارند. یکی از ویژگی­های منحصر بفرد این رسوبات وجود رخنمون­های کاملی از سنگ­های پرمین میانی تا پرمین بالایی است که نشانگر رخدادهای پایانی پرمین میانی است. منطقه مورد بررسی شامل دو بُرش چینه­شناسی در دره همبست شامل واحد 3 سازند سورمق (Capitanian)، سازند آباده (Capitanian) شامل واحد 4a، واحد 4b، واحد  5و بخش آغازین سازند همبست (Wuchiapingian) می­باشد. بر پایه پژوهش انجام شده بر روی 380 بُرش نازک میکروسکوپی شمار 10 ریزرخساره رسوبی شامل ریزرخساره­های وکستون بایوکلاستی، پکستون بایوکلاستی (استافلید)، وکستون بایوکلاستی (همی­گوردیوپسیده)، وکستون / پکستون بایوکلاستی، وکستون بایوکلاستی (جلبکی)، وکستون بایوکلاستی (استراکد)،وکستون بایوکلاستی فنسترال­دار، وکستون استروماتولیت­دار،دولوستون و مادستون شناسایی شد. این ریزرخساره­هادر پلاتفرمی از نوع رمپ هم­شیبنهشته شدند ووابسته به محیط لاگون غیرمحصور و محیط کشندی بودند.

کلیدواژه‌ها


عنوان مقاله [English]

Introduce of microfacies and sedimentary environment of the end of middle Permian deposits and Guadalupian-Lopingian boundary in the west of Tethys, Abadeh area, Iran

نویسندگان [English]

  • S. Shahinfar
  • B. Yousefi Yegane
  • S. Arefifard
چکیده [English]

In Iran, the Permian-Triassic sediments are located in the northeastern part of Hambast Mountain, 60 km south-east of Abadeh city. One of the unique features of these sediments is the existence of complete outcrops from the middle Permian to the Upper Permian rocks, which show the accidents happened at the end of  middle Permian. The study area includes two stratigraphic sections in the Hambast valley, including unit 3 of Surmaq Formation (Capitanian), Abadeh  Formation (Capitanian), including unit 4a, unit 4b and unit 5, and the primary part of the  Hambast Formation (Wuchiapingian). Based on studies have been done on 380 microscopic thin sections, 10 sedimentary microfacies include bioclast wackestone, bioclast staffelid packstone, bioclast hemigordiopside wackestone, bioclast wackestone / packstone, bioclast algal wackestone, bioclast ostracod wackestone, fenestral bioclast wackestone, stromatolite wackestone, dolostone and mudstone, were identified. These microfacies have been deposited in a homoclinal ramp platform and related to unlimited lagoon and tidal environment.

کلیدواژه‌ها [English]

  • Garau Formation
  • West of Khorramabad
  • Rock-Eval Pyrolysis
  • Source rock
  • North-west of Kermanshah
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دوره 7، شماره 13
بهار و تابستان 1398
صفحه 131-148
  • فایل‌های تکمیلی/اضافی
  • N8A.pdf
  • تاریخ دریافت: 04 اسفند 1397
  • تاریخ بازنگری: 04 خرداد 1397
  • تاریخ پذیرش: 22 مرداد 1398