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Denudation rates of carbonate coasts: Insights from in situ cosmogenic 36CL from Cuban coastal terraces
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DOI：10.1002/esp.70305.png)
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Abstract
En 中文
Cuba's rocky coasts are partly composed of carbonate rock derived from uplifted coral reefs. These coasts exhibit sequences of coastal terraces shaped by both marine and continental erosion, exacerbated by extreme events typical of tropical climates (hurricanes). Determining the coastal denudation rates on these coasts allows quantification of spatial variation in this erosion, providing valuable insights into landscape evolution and the interactions between geological processes and coastal environmental conditions. Here, we calculated denudation rates by combining the 36Cl cosmogenic nuclide concentrations measured in 19 surface limestone samples and 11 new 230Th/U dating results obtained from living-growth position corals. Denudation rates are obtained for the distal and inner edges of the lowermost coastal terraces (12 samples) and along the long-lasting sequence of coral reef terraces of Cape Maisí (reaching 372.0 ± 1.5 m in elevation, seven samples). This approach enables discussion of the continental erosion occurring beyond areas directly influenced by marine erosion. Denudation rates on low-lying coastal terraces range from 5 ± 1 to 32 ± 10 mm ka−1, increasing near the coastline and reflecting the impact of wave breaking on coastal erosion. On the coastal terrace sequence starting in a beach zone, the in situ denudation rate increases from 0.2 ± 0.1 to 36 ± 11 mm ka−1 with elevation. Our results highlight that the beaches protect the inner parts of the low-lying coastal terrace from denudation. We also show that the effectiveness of continental denudation increases with the age of chemical weathering of coastal surfaces. On the whole, this study demonstrates that both marine and continental erosion processes play an important role in the morphological evolution of the coastline.
Keywords:
230Th/U dating
36Cl cosmogenic nuclides
coastal erosion
Cuba
denudation rate
marine terrace
Journal
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2.7
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324
Citations:
1.5W
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