| Autor: |
Suzanne O'Connell, Andrés Maldonado, Lorenzo Mirabile, André Monaco, Henri Got |
| Rok vydání: |
1985 |
| Předmět: |
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| Zdroj: |
Marine Geology. 62:295-319 |
| ISSN: |
0025-3227 |
| DOI: |
10.1016/0025-3227(85)90121-5 |
| Popis: |
The Valencia Fan, one of the larger deep-sea depositional systems in the western Mediterranean Sea, developed in the large depression between the Valencia Trough and the Balearic Basin Plain. Six main lithoseismic units are identified and sedimentary processes inferred from 6000 km of sparker profiles. This fan is largely formed by channelized and irregularly stratified units. The sedimentary processes controlling the development of these units include channelized sediment flows that evolve downfan into sheet flows. Three fan depositional provinces are differentiated on the basis of the relative proportions of lithoseismic units and the inferred sedimentary processes. Regularly stratified seismic units predominate in the non-fan environments. These units are dominated by fine-grained deposits resulting from hemipelagic settling and overbank flows from turbid currents. Distal flows from the continental slopes of the Iberian Peninsula and Balearic Islands also contribute materials for the development of these environments. The wavy units flanking the upper fan may have resulted from migrating sediment waves or limited mass-displacement of the stratified units, while the transparent units are attributed to extensive mass-flow. The Valencia Valley is largely an erosional feature across which sediments from several source areas bypassed to the distal, deep-sea depositional system of the Valencia Fan. Deposition begins at the mouth of the valley beyond which there is a break in slope. The fan migrated upslope and filled the Valencia Valley from the distal sectors. This evolution has been controlled by the interplay between sedimentary processes active in the fan growth and large-scale geological factors related to the structural framework of the study area. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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