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Article Dans Une Revue Lithology and Mineral Resources Année : 2010

Upper quaternary laminated sapropelic sediments from the continental slope of Baja California

I. O. Murdmaa
  • Fonction : Auteur
G. H. Kazarina
  • Fonction : Auteur
E. V. Ivanova
  • Fonction : Auteur
E. M. Emelyanov
  • Fonction : Auteur
V. A. Kravtsov
  • Fonction : Auteur
G. N. Alekhina
  • Fonction : Auteur
V. E. Vasileva
  • Fonction : Auteur

Résumé

Core MD02-2508 retrieved from the plateau of the continental slope off Baja California recovered a 40-m-thick section of sapropel (up to 15% C(org)), calcareous clay, and diatom ooze with the age of 120 ka at the core bottom. The section is subdivided into three units: Unit I (Holocene) consists of the laminated sapropel; Unit II comprising oxygen isotope stages (MIS) 2, 3, and 4 is represented by homogeneous calcareous clay with interbeds of slightly siliceous sapropelic mud; and Unit III (MIS-5) is composed of laminated sapropelic diatom ooze. Laminated intervals are characterized by the intercalation of two lamina types: (1) dark-colored organic-rich laminae containing multi-species ``oceanic'' diatom assemblages, as well as radiolarians, coccoliths, planktonic and benthic foraminifera; (2) lighter-colored laminae consisting of diatom ooze with the neritic colonial diatom assemblages commonly composed of one to three species of a single genera. The dark laminae are assumed to be generated within a high productivity zone over the slope, whereas light ones likely represent diatom mats produced by short-term boisterous phytoplankton blooms, possibly in the coastal upwelling.

Dates et versions

hal-01458314 , version 1 (06-02-2017)

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Citer

I. O. Murdmaa, G. H. Kazarina, L. Beaufort, E. V. Ivanova, E. M. Emelyanov, et al.. Upper quaternary laminated sapropelic sediments from the continental slope of Baja California. Lithology and Mineral Resources, 2010, 45 (2), pp.154-171. ⟨10.1134/S0024490210020057⟩. ⟨hal-01458314⟩
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