(Table 2) Chemical composition of phosphates from the Namibian and Chilean shelves ...

• Main Authors: Baturin, Gleb N, Dubinchuk, V T
• Format: Dataset
• Language: English
• Published: PANGAEA 2005
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; Area/locality; Sample type; Epoch; Phosphorus pentoxide; Calcium oxide; Magnesium oxide; Sodium oxide; Potassium oxide; Silicon dioxide; Aluminium oxide; Titanium dioxide; Iron oxide, Fe2O3; Manganese oxide; Carbon dioxide; Carbon, organic, total; Uranium; Thorium; Lanthanum; Cerium; Yttrium; Grab; Dredge; Inductively coupled plasma - mass spectrometry ICP-MS; Carbon analyser AN-7529, 7560; AKU4; ML26; Akademik Kurchatov; Mikhail Lomonosov; Archive of Ocean Data ARCOD
• Online Access: https://dx.doi.org/10.1594/pangaea.763666; https://doi.pangaea.de/10.1594/PANGAEA.763666

This study on phosphorites of different compositions and ages from shelf sediments and seamounts of the Pacific Ocean by means of analytical electron microscopy showed that these phosphorites contain ultra-microscopic inclusions of authigenic minerals and, more rarely, of rare earth element (REE) minerals. In some of phosphorite samples of Pleistocene-Pliocene age from the Namibian shelf both kinds of minerals were found. Uranium minerals were represented by uraninite, coffinite, and ningioite; those of REE - by monazite, xenotime, and bastnesite, which points to their potential accumulation not only as isomorphous admixtures in calcium phosphate but also as independent mineral phases. Coexistence of the minerals noted in shelf phosphorites is caused by repeated changes in redox conditions during formation and then redeposition of phosphate concretions. Presence of uranium minerals in phosphorites from seamounts shows that during an initial step of formation of these phosphorites environment was rather ... : Supplement to: Baturin, Gleb N; Dubinchuk, V T (2005): Authigenic minerals of uranium and rare earth elements in oceanic phosphorites. Translated from Okeanologiya, 2005, 45(6), 906-915, Oceanology, 45(6), 857-866 ...