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Wednesday, November 2, 2011
Tectonics or Climate: Which controls Sedimentation?
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Tectonics creates areas for sediment accumulation as 'lows', without tectonics there would be no long term accumulation of sediments, no sedimentary rocks and no stratigraphy. So the tectonics provides basic space for sediments to get accumulated into reasonably thick blocks to form sedimentary rocks.
As far as climate is concerned it mainly effects the weathering and supply of sediments to the sedimentary basin. Then it also effects the deposition patterns as changes in the mean sea level resulting in off laps, top laps, down laps etc.
Furthermore the sedimentary basins are characterized on the type of tectonic settings not on the basis of climates. e.g;
1. Rift Basins
2. Intra-cratonic basins,
3. Proto-oceanic troughs,
4. Accretionary complexes,
5. Passive margins,
6.Obducted Slabs,
7. Trenches,
8. Forearc basins
9. Backarc bains,
10. Foreland basins etc.
These all are classified on tectonics of the basin (accumulation space). So we can say the tectonics controls the sedimentation.
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