کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4692094 | 1636774 | 2014 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The Rovuma Delta deep-water fold-and-thrust belt, offshore Mozambique The Rovuma Delta deep-water fold-and-thrust belt, offshore Mozambique](/preview/png/4692094.png)
• The Rovuma Delta is a linked system of up-dip extension and down-dip compression
• Two arcuate complexes with different architecture and extend: Palma and Mocimboa
• The southern Mocimboa complex shows multiple detachments with thrust duplexes
• DWFTBs are formed by gravity-driven under thick seaward-dipping shale detachment
We interpret two-dimensional seismic reflection data from the Rovuma Delta basin deep-water fold-and-thrust belts. Two major arcuate complexes with different architecture and extent are identified. While in the northern Palma arcuate complex a multitude of steep, east-dipping thrust-related fold anticlines formed above a single main detachment, in the southern Mocimboa arcuate complex multiple detachments resulted in the formation of thrust duplexes. In between the two arcuate domains, only few thrust-related fold anticlines developed.Our interpretation of the Rovuma basin is a linked system of up-dip extension and down-dip compression that is mainly driven by gravity tectonics. Sediment loading and a hinterland uplift due to the development of the East African Rift System since the Oligocene is proposed as origin of the delta.It is shown that the main, seaward-dipping detachment in Early Cenozoic strata is likely under-compacted and overpressured shale. Conversely, shale diapirism is questionable since the shape and location of such structures in the fold-and-thrust-belts appear simply indicating steeply dipping imbricated folds, rooted by a near vertical thrust.We suggest that mainly a different rheology and thickness and thus efficiency of the shale detachment across the delta resulted in different morphologies and geometries of the deep-water fold-and-thrust-belts.
Journal: Tectonophysics - Volume 614, 18 February 2014, Pages 91–99