کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4728436 1640190 2016 26 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sedimentology, diagenesis, clay mineralogy and sequential analysis model of Upper Paleocene evaporite-carbonate ramp succession from Tamerza area (Gafsa Basin: Southern Tunisia)
ترجمه فارسی عنوان
رسوب شناسی، دیگنزیس، کانی شناسی رس و مدل تحلیل پیوسته فرابورس فرابنفشی کربناتی پالئوسن بالا از ناحیه تامرزا (حوضه گافس: جنوب تونس)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


• The late Paleocene deposits shows the presence of nine different facies that were deposited in three environment belts: Sebkha, inner ramp and outer ramp creating different types of confinement and summarized in a Homoclinal ramp under an arid climate.
• Nine different types of depositional cycles and several models of Sebkha sequences were defined.
• The stacking of seven depositional sequences seems to be under the main control of astronomical parameters which are responsible of sea level fluctuations.

Integrated sedimentological studies, diagenesis, sequential analysis and clay mineralogy on the Upper Paleocene rocks in Tamerza area provide important information on the reconstruction of the depositional basin, cyclicity, and paleoclimatic contexts. Facies analysis and petrographic studies have led to the recognition of nine facies that were deposited in three facies belts: Sebkha, inner ramp and outer ramp summarized in a carbonate ramp model: Homoclinal ramp under an arid climate.The upward and lateral changes in thickness and composition show a general regressive trend that records a transition from an outer ramp to Sebkha, creating different types of confinement. The facies stacking patterns constitute several kinds of meter-scale, shallowing-upward cycles. Nine different types of depositional cycles and several models of Sebkha sequences were defined. These different types of facies, characterized within the Thelja Formation, compose seven depositional sequences, mainly made of carbonates, marls and evaporates. Detailed multi approach analysis provides important information on evaporitic sequence stratigraphy.In carbonates beds, the diagenetic analysis provides an overview and chronology of diagenetic processes. A particular attention was paid to early stage cementation which enables us to characterize better the depositional environments. In addition to cementation, other features define the diagenetic history.X-ray diffraction reveals the presence of smectite suggesting an arid climate. Moreover, the clinoptilolite and the frequency of primary dolomite indicate different degrees of confinement.The seven depositional sequences showing a hierarchical organization of many cycles, as described above, suggested that eustatic sea level oscillations caused by cyclic perturbations of the Earth's orbit play a fundamental role in determining the formation of hierarchical cyclic rhythmicity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of African Earth Sciences - Volume 118, June 2016, Pages 205–230
نویسندگان
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