Late Pleistocene-Holocene high-resolution sequence analysis on the Alboran Sea continental shelf
Hernandez-Molina, F.J.; Somoza, L.; Rey, J. (1996). Late Pleistocene-Holocene high-resolution sequence analysis on the Alboran Sea continental shelf, in: De Batist, M. et al. (Ed.) Geology of siliciclastic shelf seas. pp. 139-154
In: De Batist, M.; Jacobs, P. (Ed.) (1996). Geology of siliciclastic shelf seas. Geological Society Special Publication, 117. The Geological Society (London): London. ISBN 1-897799-67-5. 345 pp., meer
In: Hartley, A.J. et al. (Ed.) Geological Society Special Publication. Geological Society of London: Oxford; London; Edinburgh; Boston, Mass.; Carlton, Vic.. ISSN 0305-8719; e-ISSN 2041-4927, meer
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| Auteurs | | Top |
- Hernandez-Molina, F.J.
- Somoza, L.
- Rey, J.
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| Abstract |
We present results of a detailed high-resolution seismic stratigraphy analysis of the northwestem margin of the Alboran Sea, between Málaga and the Gibraltar strait, based on a network of high- and very high-resolution seismic profiles. These profiles allow the determination of several scales of depositional sequences that are related to relative sealevel cycles of different order on the continental shelf and slope. The Late pleistocene-Holocene deposits on these comprise ten seismic units characterizing lowstand, transgressive and highstand deposits. These deposits allow definition of a main Type I depositional sequence for the last 20 ka sedimentary record. This sequence is made up of minor depositional sequences produced by high-frequency relative sea-level cycles with a frequency range below the Milankovitch band. In this way, the last eustatic hemicycle was modulated by three types of very high-resolution sea-level cycles: The 'P cycles', being longest, caused the major sedimentary progradations (P1 ,P2, P3, P4 and P5). The smaller eustatic changes of the 'h cycles' created smaller progradations, and the 'c cycles', consisting of short stillstands, resulted in sets of minor progradations within the larger cycles. |
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