Academic Journal
Allogenic controls on autogenic variability in fluvio‐deltaic systems: inferences from analysis of synthetic stratigraphy
| العنوان: | Allogenic controls on autogenic variability in fluvio‐deltaic systems: inferences from analysis of synthetic stratigraphy |
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| المؤلفون: | Karamitopoulos, P., Weltje, G. J., Dalman, R. A. F. |
| المساهمون: | Delft University of Technology |
| المصدر: | Basin Research ; volume 26, issue 6, page 767-779 ; ISSN 0950-091X 1365-2117 |
| بيانات النشر: | Wiley |
| سنة النشر: | 2014 |
| المجموعة: | Wiley Online Library (Open Access Articles via Crossref) |
| الوصف: | Fluvio‐deltaic stratigraphy develops under continuous morphodynamic interactions of allogenic and autogenic processes, but the role and relative contribution of these processes to the stratigraphic record are poorly understood. We analysed synthetic fluvio‐deltaic deposits of several accommodation‐to‐supply cycles (sequences) with the aim to relate stratigraphic variability to autogenic and allogenic controls. The synthetic stratigraphy was produced in a series of long time‐scale (10 5 years) numerical experiments with an aggregated process‐based model using a typical passive‐margin topography with constant rates of liquid and solid river discharge subjected to sinusoidal sea‐level fluctuation. Post‐processing of synthetic stratigraphy allowed us to quantify stratigraphic variability by means of local and regional net sediment accumulation over equally spaced time intervals (1–10 kyr). The regional signal was subjected to different methods of time‐series analysis. In addition, major avulsion sites (>5 km from the coastline) were extracted from the synthetic stratigraphy to confirm the interpretations of our analyses. Regional stratigraphic variability as defined in this study is modulated by a long‐term allogenic signal, which reflects the rate of sea‐level fluctuation, and it preserves two autogenic frequency bands: the intermediate and high‐frequency components. The intermediate autogenic component corresponds to major avulsions with a median inter‐avulsion period of ca . 3 kyr. This component peaks during time intervals in which aggradation occurs on the delta plain, because super‐elevation of channel belts is a prerequisite for large‐scale avulsions. Major avulsions occur occasionally during early stages of relative sea‐level fall, but they are fully absent once the coast line reaches the shelf edge and incision takes place. These results are consistent with a number of field studies of falling‐stage deposition in fluvial systems. The high‐frequency autogenic component (decadal to centennial time ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1111/bre.12065 |
| الاتاحة: | http://dx.doi.org/10.1111/bre.12065 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12065 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12065 |
| Rights: | http://onlinelibrary.wiley.com/termsAndConditions#vor |
| رقم الانضمام: | edsbas.F9F9777F |
| قاعدة البيانات: | BASE |
| DOI: | 10.1111/bre.12065 |
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