Estudio de paleotemperaturas en el Mar de Alboran entre 250 y 150 ka utilizando la tecnica de los analogos modernos  [Study of paleotemperatures in the Alboran Sea between 250 and 150 kyr with the modern analog technique]

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Alternate Title(s): Study of paleotemperatures in the Alboran Sea between 250 and 150 kyr with the modern analog technique
Author(s): González-Mora, B.; Sierro Sánchez, Francisco Javier; Flores, José Abel
Author Affiliation(s): Primary:
Universidad de Salamanca, Departamento de Geologia, Salamanca, Spain
Volume Title: Comunicaciones presentadas en la 40 sesion cientifica de la Sociedad Geologica de España
Volume Author(s): Huertas Coronel, María José, editor; Sancho Marcen, C.; Colombo Piñol, F.
Source: Geogaceta, Vol.40, p.219-222; 40. sesion cientifica de la Sociedad Geologica de España, Leon, Spain, May 26, 2006, edited by María José Huertas Coronel, C. Sancho Marcen and F. Colombo Piñol. Publisher: Sociedad Geológica de España, Salamanca, Spain. ISSN: 0213-683X
Note: In Spanish with English summary. 13 refs.; illus.
Summary: Planktonic foraminifers from ODP site 977a have been studied to estimate sea surface temperatures (SST) in the Alboran Sea between 245 and 145 kyr. Similar studies have been performed in this basin but only for the last 150 kyr (Perez-Folgado et al., 2004). SSTs in this basin are highly controlled by the Atlantic superficial incoming flux through the Gibraltar Strait. In this study we estimate paleotemperatures with the modern analog technique which consists of a comparison between core and modern sample assemblages. This method assumes that similar planktonic foraminifer assemblages develop under the same ecological conditions and that foraminifer ecological preferences have not changed in time. This technique also provides a dissimilarity index (between 0 and 1) which depends on the liability of the estimation obtained. In this study we used the Kallel et al. (1997) modern database which contains a total of 253 samples, 123 from the North Atlantic and 130 from the Mediterranean Sea. For the estimations we used PaleoAnalogs 2.0, a computer program developed by the University of Salamanca (Theron et al., 2004). A small SST difference exists between substages 7.3, 7.2 and 7.1. Important millennial cyclicities (7.4, 5.6 and 4.6 kyr) occur during the whole studied period, both in warm and cold intervals, although changes seem to be broader during cold ones. Seasonality is higher during the warmer substages, 7.5 and 7.3, whereas it is smaller during the strong Northern Hemisphere summer insolation minimum in substage 7.4.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Alboran Sea; Foraminifera; Globigerina; Globigerina bulloides; Globigerinacea; Globigerinidae; Invertebrata; Leg 161; Mediterranean Sea; Microfossils; New methods; ODP Site 977; Ocean Drilling Program; Paleoecology; Paleotemperature; Planktonic taxa; Protista; Rotaliina; Sea-surface temperature; West Mediterranean
Coordinates: N360154 N360154 W0015719 W0015719
Record ID: 2016015134
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Instituto Geologico y Minero de Espana, Madrid, Spain