Workshop on “Decoding the Last Interglacial in Western Mediterranean” INQUA Project 0911-CMP Commission SARDINIA – 25-29 October, 2010
Abstracts Volume
Editors: A. Cabero, T. Bardají, S. Carboni
Abstracts Volume Workshop on “Decoding the Last Interglacial in Western Mediterranean” INQUA Project 0911‐CMP Commission
Editors A. Cabero, T. Bardají, S. Carboni
This Abstracts Volume has been produced for the Workshop on “Decoding the Last Interglacial in Western Mediterranean” held Sardinia (Italy). The event has been organized by the INQUA Project 0911 – WG‐Long Term Sea Level Changes ‐ CMP Commission. This scientific meeting has been supported by the IINQUA Project 0911, Universitá di Cagliari (Italy), Universidad de Alcalá (Spain), UNED (Universidad Nacional de Educación a Distancia, Spain), and Spanish Research Projects CGL08‐03998BTE, CGL08‐04000BTE and CGL2010‐ 10916‐E
Decoding the Last Interglacial in Western Mediterranean- INQUA Project 0911-CMP Comm.
Sardinia, October 2010
Marine and terrestrial environment relationships in coastal areas during Late Pleistocene (Formentera, Balearic Islands) Goy, J.L. 1, Zazo, C. 2, Dabrio, C.J. 3, Cabero, A. 4, Lario, J. 4, Roquero, E. 5, Mercier, N. 6, Soler, V. 7 1. Dept. Geología, Univ. Salamanca (
[email protected],
[email protected]) 2. Dept. Geología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, (
[email protected]) 3. Dept. Estratigrafía and Instituto de Geología Económica, UCM-CSIC, Madrid (
[email protected]) 4. Facultad de Ciencias, UNED Madrid (
[email protected],
[email protected]) 5. Dept. Edafología, ETS I. Agrónomos, Univ. Politécnica, 28040–Madrid (
[email protected]) 6. Inst. Rech. Archéomatériaux, CNRS - Université Bordeaux 3 (
[email protected]) 7. Estación Volcanológica de Canarias, CSIC, La Laguna-Tenerife (
[email protected])
Abstract A marine to terrestrial succession investigated along the sea cliffs at Caló d’Es Mort in southern Formentera Island shows two marine units, separated by erosion surfaces: a lower, tectonically deformed, conglomeratic with some oolites, bearing warm Senegalese fauna,,Strombus bubonius,,Conus testudinarius, is overlaid by a calcarenite with reddish matrix rich in Glycymerys. Inland near this site, as well as in the northern coast, large accumulations of dune systems very rich in oolites can be recognized from 0m to 12m. Based on geomorphological, sedimentological and paleontological data of the Spanish littoral, oolitic facies are associated to the oldest highstand of MIS 5e, when rich oolitic beaches developed. The present elevation of these beaches in non-uplifted coast zones, suggests that sea-level during the first highstand (~ 135Ka) was lower than during the two more-recent MIS 5e highstands. In Formentera, faunal content and OSL ages of the overlying terrestrial deposits suggest that the two marine units represent the second and third MIS 5e higstands, and that the marine unit associated to oolitic dunes lies below present sea level. Regressive deposits at Caló d’Es Mort consist of a complex sequence of aeolian, colluvium and alluvial sediments including edaphic horizons and prominent erosion surfaces. The older unit, begins with one metre-thick colluvium on which a red paleosol was developed, followed upward by a large (minimum preserved thickness: 5 m) aeolian dune system that started to accumulate ca. 72 Ka, and migrated N170°- 190°E. It represents the transition from relatively wet to more arid conditions during OIS 4. A prominent erosion surface that dismantled a large part of this unit is interpreted as fluvial and assigned to more humid conditions between OIS 4 and 3. Then, a complex terrestrial unit with OSL ages ranging from ca. 53 to 39 Ka (OIS 3), including three subunits: with dominance of edaphic horizons, local episodes of torrential floods, and remains of aeolian dunes: barchans-like in the lower part, with mean direction of migration to N80°- 90°E, medium sized transverse dunes migrating towards N and E, and repeatedly colonized by plants in the middle subunit, and shallow troughs associated to westerly winds (migration to the E) in the upper unit. This complex is topped by a major reddened, partly encrusted, deflation surface assigned to the last glacial maximum. It is covered by partly cemented dunes, 3 to 5 m high, which migrated to N170°E, and a succession of loose-sand dunes with interbedded organic-rich, grey to blackish layers that adapt to the morphology of dunes that record paleoedaphic layers with preserved plant roots, an local paleoflood features. OSL ages from ca. 20 to 14 Ka indicate deposition during OIS 2. Acknowledgements: Research Projects CGL08-03998BTE, CGL08-04000BTE, ConsoliderIngenio CSD2007-00067-GRACCIE. UCM Research Group 910198 (Paleoclimatology and Global Change); GEOTOP Lab. Contrib. IGCP 588. INQUA Project 0911 and INQUA-CMP Commission. References Goy, J.L., et al. (2007). Abstract Vol.XII Reun.Nac.Cuaternario, AEQUA,Avila. 203-204. Hilaire Marcel,C. et al.(1996). Quat. Science Reviews, 15, 53-62 Zazo, C., et al. (2003). Mar. Geol., 194, 103-133. 27
