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Museo Nacional de Ciencias Naturales
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zazo, Caridad Somoza, Luís Oabrio, C. J. |
| Copyright Year | 2004 |
| Abstract | The Elche Basin-Lower Segura Baios is located in the eastern end of the Betic Cordillera at the northern end of the «Ieft lateral shear zone» defined by Montenat el al., (1987). Geomorphologic and sedimentologic analysis of the area show that the present configuDepartamento de Geodinámica, Facultad de Geología, Universidad Complutense. 28040-Madrid. Departamento de Geología, Museo Nacional de Ciencias Naturales e.S.I.e. y Departamento de Geodinámica, Facultad de Geología. Universidad Complutense. 28040-Madrid. Departamento de Estatrigrafía, Facultad de Geología, Universidad Complutense. 28040-Madrid. Introducción J. L. GOY. C. ZAZO. L. SOMOZA. C. J. DABRIO ration of this coastal segment in intimately related lo neotectonic activity of the final traet of the «Ieft lateral shear zone» along the Quaternary. During Late Pliocene the sea occupied a large area extending to the toe of the Sierra (range) de Crevillente, Segura Massif. Sierra de Carrasco y and Sierra de Cartagena reliefs. Yellow, fossilifeorus calcarenites deposited in the shalow marine shelf which opened towards the southeast. During Lower Pleistocene uplift of the previously cited reliefs triggered a widespread regression and the shoreline carne to rest much claser to the present position. Barrier island and lagoonal marine facies forming the so-called «El Moncaya-El Molar Transitianal Unit» (Somoza, 1989; Goy et. al., 1989 a) witness this marine-terrestriallimit along Sierra del Molar. Sierra del Moncayo, Rojales, Puerto de San Pedro, etc. Progradation towards the southeast is visible in this Unie Uplift of the surrouding reliefs favoured the deposition of alluvial fans as well. Distal facies of these alluvial fans overly the «El Moncayo-El Molar Transitional Unit» in the area of El Moncayo, El Molar and Sierra de Columbares. A reactivation of the final (eastern) traet of the «left lateral shear zone» during LowerMiddle Pleistocene occured due to the welding of the Palomeras-Alhama and Vélez Rubio faults together with movements along the N 120-130" E fault systems. As a consequence a sudden palaeogeographical ehange took plaee across the whole area with change of lithologies and direction of progradation of marine units. In this time, the Lower Segura Basin was generated in a zone of strong subsidenee. The Segura River brought up quartzitic, Betic-derived, sediments from the west to the new basin which formed fan deltas, known as the «Segura Conglomerates» (Goy et. al., 1989 b). In Rojales and La Zeneta outerops only the most eoastal facies of the «Segura Conglomerates» can be observed at the moment, forming fossil beaches whieh prograded towards the north and east. The generation of the Elche and the Lower Segura Basins is responsible of the separation of the proximal and the distal facies of the older alluvial fans (Goy & Zazo, 1989). |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://digital.csic.es/bitstream/10261/4432/1/Analisis%20Riesgo%20Tenerife.pdf |
| Alternate Webpage(s) | https://eprints.ucm.es/10720/1/1990_1_Bajo_Segura_ESGEOL.pdf |
| Alternate Webpage(s) | https://gredos.usal.es/jspui/bitstream/10366/112790/1/EB06_N048_P55-57.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
