Formation and Evolution of Phosphorite Grains and Nodules on the Namibian Shelf, from Recent to Pleistocene
Published:January 01, 2000
G. N. Baturin, 2000. "Formation and Evolution of Phosphorite Grains and Nodules on the Namibian Shelf, from Recent to Pleistocene", Marine Authigenesis: From Global to Microbial, Craig R. Glenn, Liliane Prévôt-Lucas, Jacques Lucas
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Phosphatic grains and nodules related to recent diatom oozes on the inner Namibian shelf as well as Pleistocene grains and nodules from the phosphorite deposit on the adjacent outer shelf have been studied by means of scanning electron microscopy combined with several analytical methods.
Recent grain and nodules are being formed simultaneously in the same diatom oozes. Both consist of poorly, moderately, and well-lithificd varieties that reflect the process of progressive phosphatization, compaction, and crystallization of phosphatic matter along with dissolution and expulsion of nonphosphatic components. Similar processes are going on during the phosphatization of macro- and microcoprolites. The...
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Marine Authigenesis: From Global to Microbial
This volume is a collection of 33 state-of-the-art papers focusing on various aspects of authigenic and diagenetic marine minerals and related global elemental cycling. The commingling of the various studies of authigenic minerals in this volume, including the most recent advances in knowledge concerning the occurrence and origins of phosphorites, glauconites, dolomites, siderites, manganese-iron associations, barites, ironstones, and other marine chemical sediments/sedimentary rocks of early authigenic/diagenetic origin, is partly the result of the increasing awareness that there are many overlaps, even direct co-associations, between different authigenic minerals, both in time, space, and genesis. Taken together, this compilation represents a holistic approach towards marine authigenesis that considers the integrated whole more than the simple sum of its parts.