Abstract
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% Corg), 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.
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Original Russian Text © I.O. Murdmaa, G.H. Kazarina, L. Beaufort, E.V. Ivanova, E.M. Emelyanov, V.A. Kravtsov, G.N. Alekhina, V.E. Vasileva, 2010, published in Litologiya i Poleznye Iskopaemye, 2010, No. 2, pp. 171–191.
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Murdmaa, I.O., Kazarina, G.H., Beaufort, L. et al. Upper quaternary laminated sapropelic sediments from the continental slope of Baja California. Lithol Miner Resour 45, 154–171 (2010). https://doi.org/10.1134/S0024490210020057
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DOI: https://doi.org/10.1134/S0024490210020057