Source and diagenesis of Middle Jurassic marine mudstones, Kopet-Dagh Basin, NE Iran

Document Type : Research Paper


1 Department of Geology, Mashhad Branch, Islamic Azad University, Mashhad, Iarn

2 Department of Geology, Saint Mary’s University, Halifax, Nova Scotia, Canada B3H 3C3


Middle Jurassic fluvio-deltaic and turbiditic mudstones of the Kashafrud Formation, are important hydrocarbon sources in the gas-rich Kopet-Dagh Basin, northeast Iran. Clay mineral assemblages are important for interpretation of sediment provenance and for understanding burial diagenetic cementation in sandstones. The clay mineral assemblages in mudrocks in two areas, Saleh-Abad and Senjedak, were investigated by X-ray diffraction analysis. A total of 28 bulk samples (14 each section) were analysed and from 11 of these samples the


Article Title [فارسی]

منشأ و دیاژنز گلسنگ های ژوراسیک میانی، حوضه رسوب کپه داغ، شمال شرق ایران

Author [فارسی]

  • مهدی رضا پورسلطانی 1
1 گروه زمین شناسی، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران
Abstract [فارسی]

گلسنگهای رودخانه ای-دلتایی سازند کشف رود، ژوراسیک میانی، منشأ مهم مواد هیدروکربوری در حوضه کپه داغ شمال شرق ایران محسوب می گردند. تجمع کانیهای رسی در تفسیر منشأ و سیمانی شدن ماسه سنگها طی دیاژنز دفنی اهمیت دارند. کانیهای رسی موجود در گلسنگها در دو منطقه صالح آباد و سنجدک توسط آزمایش تفرق اشع ایکس مورد مطالعه قرار گرفته اند. 28 نمونه بصورت توده ای (از هر برش 14 نمونه)، و 11 نمونه با اندازه کمتر از دو میکرون، بطور مجزا آزمایش شده اند. کانیهای شناسایی شده بطور عمده شامل کائولن، ایلیت، موسکویت، کلریت، لایه های مخلوط شده ایلیت-کلریت، و بطور نادر اسمکتیت است. بخشی از کانیهای رسی حمل شده و بخشی در طی دیاژنز دفنی حاصل شده اند. موسکویت حمل شده در بخشهای بالاتر برش ها فراوانی بیشتری دارند، اما اسمکتیت حمل شده نادر است. نبود لایه های مخلوط ایلیت-اسمکتیت نیز دلالت بر این دارد که اسمکتیت حاصل ایلیت شدن نمی باشد. همچنین انعکاس درخشندگی نیز حاکی از عمق 2-3 کیلومتر است، اما وجود کلریت و لایه های مخلوط ایلیت-کلریت حاصل از دیاژنز دلالت بر عمق تدفین بیشتری دارد. بالاآمدگی سریع سنگ کف گرانیت و سنگهای با دگرگونی درجه پایین منشأ کانیهای موسکویت و کلریت محسوب می گردند.

Keywords [فارسی]

  • دیاژنز دفنی
  • کانیهای رسی
  • ژوراسیک میانی
  • حوضه کپه داغ
  • ایران
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Volume 5, Issue 2 - Serial Number 2
Summer & Autumn
October 2015
Pages 93-109
  • Receive Date: 05 June 2015
  • Revise Date: 07 November 2015
  • Accept Date: 25 November 2015
  • First Publish Date: 25 November 2015