Citation:

S0001437006010115

Name: (Table 1) Chemical analyses of rock samples from low atolls of the Western Indian Ocean
Published: 2006
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Compositions, structures, and microstructures of different types of phosphorites and poorly phosphatized rocks from low atolls in the near-equatorial part of the Western Indian Ocean are described. The rocks were examined under optical and scanning microscopes using microprobe techniques and etching of selected samples with weak solvents as well as with the help of chemical analyses. It is proved that phosphorites have been formed owing to the uneven phosphatization of primary carbonate rocks; degree of their phosphatization ranges from traces to 40% P2O5. In the phosphorites numerous organic remains were encountered; they included fragments of plankton, debris of tortoise shells, and coccoidal and filamentous bacteria-like formations. It is suggested that the phosphorites formed due to high local biological productivity over the outer edges of coral reefs and are not related to guano accumulation or to endoupwelling.

Project(s):

Archive of Ocean Data (ARCOD)

Coverage:

Median Latitude: -8.216667 * Median Longitude: 49.711111 * South-bound Latitude: -10.100000 * West-bound Longitude: 47.516667 * North-bound Latitude: -4.866667 * East-bound Longitude: 53.866667

Minimum Elevation: 1.0 m * Maximum Elevation: 2.0 m

Event(s):

AfI * Latitude: -4.866667 * Longitude: 53.866667 * Elevation: 1.0 m * Location: Ben African Island * Campaign: * Basis: Akademik Petrovsky * Method/Device: Hammer (HAM)

AI * Latitude: -10.100000 * Longitude: 47.750000 * Elevation: 2.0 m * Location: Astov Island * Campaign: * Basis: Akademik Petrovsky * Method/Device: Hammer (HAM)

CI * Latitude: -9.683333 * Longitude: 47.516667 * Elevation: 1.0 m * Location: Cosmoledo Island * Campaign: * Basis: Akademik Petrovsky * Method/Device: Hammer (HAM)

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		Shkol'nik, E L
6	Sample code/label	Sample label		Shkol'nik, E L
7	Phosphorus pentoxide	P2O5	%	Shkol'nik, E L	Wet chemistry
8	Calcium oxide	CaO	%	Shkol'nik, E L	Wet chemistry
9	Magnesium oxide	MgO	%	Shkol'nik, E L	Wet chemistry
10	Sodium oxide	Na2O	%	Shkol'nik, E L	Wet chemistry
11	Potassium oxide	K2O	%	Shkol'nik, E L	Wet chemistry
12	Silicon dioxide	SiO2	%	Shkol'nik, E L	Wet chemistry
13	Aluminium oxide	Al2O3	%	Shkol'nik, E L	Wet chemistry
14	Manganese oxide	MnO	%	Shkol'nik, E L	Wet chemistry
15	Titanium dioxide	TiO2	%	Shkol'nik, E L	Wet chemistry
16	Iron oxide, Fe2O3	Fe2O3	%	Shkol'nik, E L	Wet chemistry
17	Carbon dioxide	CO2	%	Shkol'nik, E L	Wet chemistry
18	Fluorine	F	%	Shkol'nik, E L	Wet chemistry
19	Sulfite	[SO3]2-	%	Shkol'nik, E L	Wet chemistry
20	Loss on ignition	LOI	%	Shkol'nik, E L	Loss of ignition analysis
21	Carbon, organic, total	TOC	%	Shkol'nik, E L	Wet chemistry

License:

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

Size:

184 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 Sample label	7 P2O5 [%]	8 CaO [%]	9 MgO [%]	10 Na2O [%]	11 K2O [%]	12 SiO2 [%]	13 Al2O3 [%]	14 MnO [%]	15 TiO2 [%]	16 Fe2O3 [%]	17 CO2 [%]	18 F [%]	19 [SO3]2- [%]	20 LOI [%]	21 TOC [%]
AfI	-4.8667	53.8667	1	Ben African Island	Af-1a	36.07	40.60			0.02		0.050		<0.01	0.100		0.29	0.29
AfI	-4.8667	53.8667	1	Ben African Island	Af-1b	33.10	44.46	1.42									1.03
AfI	-4.8667	53.8667	1	Ben African Island	Af-2	25.90	45.96	1.22	0.45	0.09	2.85	1.280	<0.010	0.17	0.120	1.45	1.50		2.77	5.13
AfI	-4.8667	53.8667	1	Ben African Island	Af-5a	35.13	46.82	2.36
AfI	-4.8667	53.8667	1	Ben African Island	Af-5b	38.80	42.56			0.06		0.044		<0.01	0.110
AfI	-4.8667	53.8667	1	Ben African Island	Af-5c	38.80	50.63	0.80	1.60	0.05	0.20	0.040	0.000	<0.01	0.092		0.66	2.20	2.62	1.45
AfI	-4.8667	53.8667	1	Ben African Island	Af-6	37.81	54.20	1.10	1.70	<0.04	<0.10	0.032	0.037	<0.01	0.080		3.88		3.00	0.71
AfI	-4.8667	53.8667	1	Ben African Island	Af-8a	40.45	50.10	0.35	0.57	0.05	1.70	0.560	0.040	<0.01	<0.005	0.80	0.95		1.80	0.88
AfI	-4.8667	53.8667	1	Ben African Island	Af-8b	36.69	45.63	1.21						0.36
AfI	-4.8667	53.8667	1	Ben African Island	Af-8c	0.10		0.13		<0.01	<0.01
AfI	-4.8667	53.8667	1	Ben African Island	Af-10	17.34	45.89	3.55											0.98
AI	-10.1000	47.7500	2	Astov Island	A-9	16.50	49.70	1.20	0.80	0.13	0.82	2.640	<0.010	0.25	0.960	0.05			0.60	0.50
AI	-10.1000	47.7500	2	Astov Island	A-10a	18.40	48.44	2.40	2.23	0.18	0.41	2.240	<0.010	0.22	2.240	0.90			1.98	0.50
AI	-10.1000	47.7500	2	Astov Island	A-10b	21.12	47.81	2.20	2.50	0.11	0.30	1.400	0.011	0.10	0.950
AI	-10.1000	47.7500	2	Astov Island	A-10	21.12	54.10	2.20	2.50	0.12		2.100		0.07	0.920
AI	-10.1000	47.7500	2	Astov Island	A-11a	1.20	45.22			0.04		0.250	<0.010	<0.01	0.150
AI	-10.1000	47.7500	2	Astov Island	A-11b	1.12	49.90	0.45											0.17
CI	-9.6833	47.5167	1	Cosmoledo Island	C-1	4.46						2.010	2.610						2.68	0.58