زيست چينه نگاري و چينه نگاري سکانسي سازند سروک در تاقديس فهليان (جنوب ياسوج)
محورهای موضوعی : زمین شناسی نفت
کلید واژه: زاگرس سازند سروک زيست چينه نگاري رمپ چينه نگاري سکانسي ,
چکیده مقاله :
در اين پژوهش زيست چينه نگاري، محيط رسوبي و چينه نگاري سکانسي سازند سروک در برش تاقديس فهليان (جنوب ياسوج) مورد بررسي قرار گرفته است. بر اساس مطالعات انجام شده 8 گونه از فرامينيفرهاي بنتيک (4 جنس) 8 گونه از فرامينيفرهاي پلانکتون (11 جنس) شناسايي شده است. 6 بيوزون بر اساس پخش و پراکندگي فرامينيفرها شناسايي گرديد: Favusella washitensis Zone, Orbitolina-Alveolinids Assemblage Zone, Rudist debris Zone, Oligostegina flood Zone, Whiteinella archaeocretacea Zone, ,Helvetoglobotruncana helvetica Zone. بر اين اساس سن آلبين – تورونين براي سازند سروک در نظر گرفته شد. بر اساس مطالعات پتروگرافي و آناليز رخساره اي 9 ريز رخساره شناسايي شد که ميتواند در 3 گروه درياي باز، سد و تالاب تقسيم شوند. محيط رسوبي سازند سروک رمپ هموکلينال هست. تجزيه و تحليل چينه نگاري سکانسي منجر به شناسايي چهار سکانس رسوبي رده سوم شد.
In this study, biostratigraphy, depositional environment and sequence stratigraphy of the Sarvak Formation at Fahliyan Anticline was studied. 8 species of benthic foraminifera (4 genera) and 8 species of planktonic foraminifera (11 genera) in the study area were recognized. 6 biozones have been recognized by distribution of the foraminifera, which in stratigraphic order are: Favusella washitensis Zone, Orbitolina-Alveolinids Assemblage Zone, Rudist debris Zone, Oligostegina flood Zone, Whiteinella archaeocretacea Zone and Helvetoglobotruncana helvetica Zone. On the basis of these, the age of Albian–Turonian was considered for the Sarvak Formation. Based on petrography and analysis of microfacies features 9 different microfacies types have been recognized, which can be grouped into 3 depositional environments: lagoon, shoal and open marine. The Sarvak Formation represents sedimentation on a carbonate ramp. Sequence stratigraphy analysis led to identification of 4 third-order sequences.
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