Citation:

PANGAEA.763666, Supplement to: Baturin, GN; Dubinchuk, VT (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

Name: (Table 2) Chemical composition of phosphates from the Namibian and Chilean shelves
Published: 2005
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

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 suboxic or reductive than oxic.

Project(s):

Archive of Ocean Data (ARCOD)

Coverage:

Median Latitude: -22.843767 * Median Longitude: -14.116400 * South-bound Latitude: -25.265000 * West-bound Longitude: -70.366700 * North-bound Latitude: -21.133300 * East-bound Longitude: 14.050500

Minimum Elevation: -199.0 m * Maximum Elevation: -85.0 m

Event(s):

AK4-250 * Latitude: -21.133300 * Longitude: -70.366700 * Elevation: -150.0 m * Location: Chile shelf * Campaign: * Basis: Akademik Kurchatov * Method/Device: Grab (GRAB)

ML26_2048 * Latitude: -22.133000 * Longitude: 13.967000 * Elevation: -85.0 m * Location: Atlantic Ocean * Campaign: * Basis: Mikhail Lomonosov * Method/Device: Dredge (DRG)

PL4-12 * Latitude: -25.265000 * Longitude: 14.050500 * Elevation: -199.0 m * Location: Namibian shelf * Method/Device: Grab (GRAB)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	Area/locality	Area		Baturin, Gleb N
6	Sample type	Samp type		Baturin, Gleb N
7	Epoch	Epoch		Baturin, Gleb N
8	Phosphorus pentoxide	P2O5	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
9	Calcium oxide	CaO	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
10	Magnesium oxide	MgO	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
11	Sodium oxide	Na2O	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
12	Potassium oxide	K2O	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
13	Silicon dioxide	SiO2	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
14	Aluminium oxide	Al2O3	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
15	Titanium dioxide	TiO2	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
16	Iron oxide, Fe2O3	Fe2O3	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
17	Manganese oxide	MnO	%	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
18	Carbon dioxide	CO2	%	Baturin, Gleb N	Carbon analyser AN-7529, 7560
19	Carbon, organic, total	TOC	%	Baturin, Gleb N	Carbon analyser AN-7529, 7560
20	Uranium	U	mg/kg	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
21	Thorium	Th	mg/kg	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
22	Lanthanum	La	mg/kg	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
23	Cerium	Ce	mg/kg	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)
24	Yttrium	Y	mg/kg	Baturin, Gleb N	Inductively coupled plasma - mass spectrometry (ICP-MS)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

120 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Latitude	3 Longitude	4 Elevation [m]	5 Area	6 Samp type	7 Epoch	8 P2O5 [%]	9 CaO [%]	10 MgO [%]	11 Na2O [%]	12 K2O [%]	13 SiO2 [%]	14 Al2O3 [%]	15 TiO2 [%]	16 Fe2O3 [%]	17 MnO [%]	18 CO2 [%]	19 TOC [%]	20 U [mg/kg]	21 Th [mg/kg]	22 La [mg/kg]	23 Ce [mg/kg]	24 Y [mg/kg]
ML26_2048	-22.133	13.967	-85	inner Namibian shelf	unconsolidated nodule	Holocene, recent	30.23	52.0	1.30	1.7	0.046	0.11	0.011	<0.0004	0.059	0.0015	5.76	1.05	29.0	<0.08	0.84	0.54	0.82
ML26_2048	-22.133	13.967	-85	inner Namibian shelf	massive nodule	Holocene, recent	32.41	43.0	1.50	1.5	0.048	0.10	0.014	<0.0009	0.048	0.0030	6.36	0.98	83.1	<0.06	0.14	0.15	0.27
PL4-12	-25.265	14.050	-199	outer Namibian shelf	small nodule	Pliocene-Pleistocene	32.50	47.7	0.83	1.4	0.200	0.69	0.640	0.0220	0.910	0.0035	5.38	0.89	78.2	1.50	8.10	17.60	10.00
PL4-12	-25.265	14.050	-199	outer Namibian shelf	large nodule	Pliocene-Pleistocene	32.45	49.5	0.76	1.4	0.059	0.40	0.073	0.0086	0.360	0.0015	6.03	0.88	37.3	0.43	4.70	10.90	6.50
PL4-12	-25.265	14.050	-199	outer Namibian shelf	phosphatized coprolite	Pliocene-Pleistocene	32.28	50.9	0.72	1.5	0.055	0.30	0.062	0.0740	0.400	0.0031	6.22	0.97	41.4	0.67	4.60	9.90	6.30
AK4-250	-21.133	-70.367	-150	Chilean shelf	unconsolidated nodule	Late Quaternary	15.73	39.7	1.40	2.1	0.950	6.10	5.100	0.1430	1.200	0.0220	2.60	0.60	108.0	3.90	10.50	17.90	9.70