XVI ReuniÃ³n CientÃfica de la Sociedad EspaÃ±ola de Arcillas - Libro ...

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Martins V et al. / Comunicaciones SEA 2001 – Baeza (Jaén) Results and discussion 14 C datations provided the following ages: 1045± 95 yr BP for layer 39-40 cm, 2380 ± 80 yr BP for layer 69-70 cm, 4340 ± 100 yr BP for layer 134-135 cm. Therefore, core KSGX 40 contains sediments which were deposited during the last 5000 yr BP, approximately. As general features, sediment grain size decreases progressively from the basis to the top of the core and illite is the predominant clay mineral, followed by kaolinite, smectite and chlorite. The two last clay minerals referred to play an important role because their contents vary significantly and in opposite way along the studied core. Taking into consideration both silt and clay fractions mineralogical composition estimation along the sedimentary column as well as grain size distribution and the total content of benthic foraminifera species related to temperate waters it was possible to establish the following zonography in the core: 1. In the section 164-100 cm the assemblage illite + kaolinite + smectite + chlorite could be recorded which indicates temperate and wet climates; from the basis to the top of this section, a decrease of smectite content associated to an increase of chlorite content was recorded; the relative abundance of benthic foraminifera corresponding to prevailing temperate-cold climates increases in some levels of this section; the higher abundance of these species found around the depths of 110 cm (~3500 yr BP), 115 cm (~4000 yr BP),140 cm (~4500 yr BP) and 160 cm (~5000 yr BP) and the higher sand fraction content existent in the sediment below the depth of 100 cm (pointing out to an higher supply of sediments to the shelf by river floods during rainy periods), allows us to assume that this section of the studied core corresponds to a period of transition from the Atlantic climate (cold and wet) to the Sub-Boreal climate (warm and dry) during which several cooler episodes did take place. It is worth to mention that between
Martins V et al. / Comunicaciones SEA 2001 – Baeza (Jaén) 3000-3500 yr BP and between 4500-5000 yr BP, approximately, the volume of Alpine glaciers did increase according to Ehlers (1996), becoming the weather progressively less cold and less wet. 2. In the section 100-50 cm the assemblage illite + kaolinite + chlorite could be recorded; in this section occurs an increase of the smectite content and a reduction of the sediment sand fraction content; this evolution is accompanied by the decrease of the total content of benthic foraminifera species related to temperate-cold climates; these facts indicate that a temperate-warm and more arid climate would have prevailed during the deposition of those sediments, situation that is in accordance with the characteristics of the Sub-Boreal climate. 3. Sediments of the upper 50 cm of the core would have been deposited under the influence of a Sub-Atlantic climate (temperate-cold and wet) during which some climatic oscillations did take place, namely the Little Climatic Optimum (between 900-1000 AD and 1200-1300 AD, approximately, according to Hugues and Diaz 1994) and the Little Ice Age (between XVI and XIX centuries, according to Grove 2001). As a matter of fact, in what concerns clay minerals, chlorite persists in higher contents, whereas smectite is practically absent along all section; in the interval 46-35 cm, which could correspond to the Little Climatic Optimum, the relative abundance of benthic foraminifera species associated to temperate-cold climates is higher than in the preceding period referred above (the Sub-Boreal climate), but smaller than in the interval between 30-18 cm, corresponding most probably to the Little Ice Age, a neo-historical glacial fluctuation which seems to have caused lower sea water temperatures. The sand fraction content in the sediment is higher in the interval 46-35 cm, fact that points out to an higher frequency of river floods during the Little Climatic Optimum, as described by Brown (1998) and Benito et al. (1996).
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XVI Reunión Científica de la Soci
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Comité de Honor Presidente Excmo.
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4 09:30-10:45 Sesión Oral de Cerá
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6 17:45-18:15 Sesión de Posters -
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8 09:00-10:45 Sesión Oral de Crist
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14 Nombramiento como Socio de Honor
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16 Lunes, 22 de octubre 12:00 h Ina
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COMUNICACIONES DE LAS SESIONES CIEN
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Mineralogía de arcillas de leptoso
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I. CRISTALOQUÍMICA
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Nieto F / Comunicaciones SEA 2001 -
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Abad I et al. / Comunicaciones SEA
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Abad I et al. / Comunicaciones SEA
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Comunicaciones SEA 2001 - Baeza (Ja
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Bentabol M et al. / Comunicaciones
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Blanes JM et al. / Comunicaciones S
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Franco F et al. / Comunicaciones SE
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Galán E et al. / Comunicaciones SE
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Jiménez de Haro MC et al. / Comuni
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Lerf A et al. / Comunicaciones SEA
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Lerf A et al. / Comunicaciones SEA
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Montes O et al. / Comunicaciones SE
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Montes O et al. / Comunicaciones SE
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Rubio B, Gil-Sotres F / Comunicacio
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IV. CERÁMICA ANTIGUA Y PATRIMONIO
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Cultrone G et al. / Comunicaciones
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Cultrone G et al. / Comunicaciones
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Flores V et al. / Comunicaciones SE
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Celis R et al. / Comunicaciones SEA
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Coroado J et al. / Comunicaciones S
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Ferraz E et al. / Comunicaciones SE
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Jamoussi F et al. / Comunicaciones
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Letaïef S et al. / Comunicaciones
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Liso Rubio MJ et al. / Comunicacion
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Martínez LM et al. / Comunicacione
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