ريزرخساره¬ها، محيط رسوبي، چينه نگاري سکانسي و کيفيت مخزنی برش انارک (دونين پسين-کربونيفر پيشين)، زون ايران مرکزي
محورهای موضوعی : شاخه های دیگر علوم زمین در ارتباط با زمین شناسی نفتالهه ستاری 1 , حسین وزیری مقدم 2 , علی بهرامی 3 , علی طاهری 4 , ساندرا ایزابلا کایسر 5 , پیتر کونیشگوف 6
1 - دانشگاه اصفهان
2 - دانشگاه اصفهان
3 - دانشگاه اصفهان
4 - دانشگاه شاهرود
5 - موزه تاریخ طبیعی اشتوتگارت
6 - موسسه پزوهش وموزه تاریخ
کلید واژه: رمپ کربناته چينه نگاري سکانسي کنودونت, دونين, کربونيفر سازند بهرام سازند شيشتو2,
چکیده مقاله :
در اين پژوهش توالي برش انارک در شمال شرقي اصفهان، زون ايران مرکزي شامل دو سازند بهرام و شيشتو2، به سن دونين پسين- کربونيفر پيشين از ديدگاه محيط رسوبگذاري و چينه نگاري سکانسي مورد ارزيابي قرار گرفته است. بررسي هاي صحرايي و مطالعه ريزرخساره ها، منجر به شناسايي12 ريزرخساره مربوط به محيط درياي باز، سد بايوکلاستي، لاگون و پهنه جزرومدي گرديد. تغييرات تدريجي ريزرخساره ها، نبود کلسي توربيدايت ها و نبود ريف هاي سدي گسترش يافته معرف نهشته شدن توالي رسوبي در يک محيط رمپ کربناته هموکلينال يا هم شيب است. با بررسي هاي چينه نگاري سکانسي 2 سکانس رده سوم شناسايي شد. در هر دو سکانس بسته هاي رسوبي فرازين و پيشرونده قابل تفکيک مي باشند. سکانس اول به سن دونين پسين (سازند بهرام) مي باشد و ضخامت آن 3/42 متر مي باشد. سکانس دوم به ضخامت 7/70 متر داراي سن دونين پسين و کربونيفر پيشين (قسمت بالاي سازند بهرام و سازند شيشتو2) مي باشد. مرز سکانس اول و سکانس دوم با توجه به عدم وجود شواهد خروج از آب، نوع دوم مي باشد.
Anarak section in northeast Isfahan, central Iran is evaluated regarding to sedimentary environment and sequence stratigraphy. Field studies and micro-facies analysis led to the identification of 12 micro-facies related to the open marine, the shoal, the lagoon and the tidal flat environments. Micro-facieses gradual change, lack of calciturbidite and lack of expanded barrier reef indicate the deposition of a sedimentary interval in a homoclinal ramp environment. Two type 3 sequences were identified by sequence stratigraphic study. Both of these sequences are separable TST and HST packages. The age of first sequence is Late Devonian (Bahram Formation) and its thickness is 42.3 meters and the second sequence with a thickness of 70.7 meters is Late Devonian-Early Carboniferous (Upper part of Bahram Formation and Shishtu2 Formation). The sequence boundary between first and second sequences is the second type boundary due to the lack of evidence for exposure.
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