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La base de données du Deep Sea Drilling Project : exploitation relationnelle et application à l'étude de la sédimentation néogène

Abstract : Deep Sea Drilling Project data which are stored on two compact disks provided the realization of a relational data base. It is restricted to the paleontological data and extraction programs provided its exploitation. Some important sedimentary trends in the oceans have been shown up for the Neogene. Seven large scale hiatuses were detected for the Neogene. Furthermore, 13 periods alternately dominated by opposed sedimentary trends (slackenings or, on the contrary, accelerations of the accumulation rates) have been shown up. Moreover, a paleoclimatic study based on the abundance of selected calcareous nannofossil species revealed 11 warm climatic trends and 10 cold climatic trends for the Neogene. Six among the seven hiatuses described in this study and most of the periods of low accumulation rates are correlative with cold climatic events (also more often than not, with periods of low marine level). Whereas periods of substantial sedimentation often coincide with warm climatic trends (and high eustatic level). The method based on unitary associations applied to the Deep Sea Drilling Project data base results in the creation of precise biochronologic divisions. So, the D.S.D.P. holes are easily correlated. The precision of these biochronologic divisions may be as accurate as divisions obtained by classical biostratigraphic charts.
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Patrick Zeyen. La base de données du Deep Sea Drilling Project : exploitation relationnelle et application à l'étude de la sédimentation néogène. Sciences de la Terre. Université Claude Bernard - Lyon 1, 1991. Français. ⟨tel-02019925⟩

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