Citation:

S0012-821X(00)00006-6

Name: Element concentrations of plagioclase and clinopyroxene in poikilitic olivine gabbros from ODP Hole 153-923A (Table 4)
Published: 2000
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Ocean Drilling Program Hole 923A, located on the western flank of the Mid-Atlantic Ridge south of the Kane Fracture Zone, recovered primitive gabbros that have mineral trace element compositions inconsistent with growth from a single parental melt. Plagioclase crystals commonly show embayed anorthitic cores overgrown by more albitic rims. Ion probe analyses of plagioclase cores and rims show consistent differences in trace element ratios, indicating variation in the trace element characteristics of their respective parental melts. This requires the existence of at least two distinct melt compositions within the crust during the generation of these gabbros. Melt compositions calculated to be parental to plagioclase cores are depleted in light rare earth elements, but enriched in yttrium, compared to basalts from this region of the Mid-Atlantic Ridge, which are normal mid-ocean ridge basalt (N-MORB). Clinopyroxene trace element compositions are similar to those predicted to be in equilibrium with N-MORB. However, primitive clinopyroxene crystals are much more magnesian than those produced in one-atmosphere experiments on N-MORB, suggesting that the major element composition of the melt was unlike N-MORB. These data require that the diverse array of melt compositions generated within the mantle beneath mid-ocean ridges are not always fully homogenised during melt extraction from the mantle and that the final stage of mixing can occur efficiently within crustal magma chambers. This has implications for the process of melt extraction from the mantle and the liquid line of descent of MORB

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 23.542600 * Longitude: -45.031600

Date/Time Start: 1994-01-07T17:27:00 * Date/Time End: 1994-01-13T02:45:00

Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 17

Event(s):

153-923A * Latitude: 23.542600 * Longitude: -45.031600 * Date/Time Start: 1994-01-07T17:27:00 * Date/Time End: 1994-01-13T02:45:00 * Elevation: -2440.0 m * Penetration: 70 m * Recovery: 40.03 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 53.6 m cored; 0 m drilled; 74.7 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	ORDINAL NUMBER	Ord No				Geocode
2	Sample code/label	Sample label		Coogan, Laurence A	DSDP/ODP/IODP sample designation
3	Plagioclase	Pl	%	Coogan, Laurence A
4	Clinopyroxene	Cpx	%	Coogan, Laurence A
5	Olivine	Ol	%	Coogan, Laurence A
6	Sample comment	Sample comment		Coogan, Laurence A		analysis
7	Minerals	Minerals		Coogan, Laurence A		phase
8	Comment	Comment		Coogan, Laurence A		location
9	Silicon dioxide	SiO2	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)
10	Titanium dioxide	TiO2	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)
11	Aluminium oxide	Al2O3	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)
12	Chromium(III) oxide	Cr2O3	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)
13	Iron oxide, FeO	FeO	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)	total iron
14	Manganese oxide	MnO	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)
15	Magnesium oxide	MgO	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)
16	Calcium oxide	CaO	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)
17	Sodium oxide	Na2O	%	Coogan, Laurence A	Electron Probe Microanalysis (EPMA)
18	Calcium/(Calcium+Sodium+Potassium) ratio	Ca/(Ca+Na+K)		Coogan, Laurence A	Calculated
19	Magnesium number	Mg#		Coogan, Laurence A	Calculated
20	Titanium	Ti	mg/kg	Coogan, Laurence A	Ion probe analysis
21	Strontium	Sr	mg/kg	Coogan, Laurence A	Ion probe analysis
22	Yttrium	Y	mg/kg	Coogan, Laurence A	Ion probe analysis
23	Zirconium	Zr	mg/kg	Coogan, Laurence A	Ion probe analysis
24	Lanthanum	La	mg/kg	Coogan, Laurence A	Ion probe analysis
25	Cerium	Ce	mg/kg	Coogan, Laurence A	Ion probe analysis
26	Praseodymium	Pr	mg/kg	Coogan, Laurence A	Ion probe analysis
27	Neodymium	Nd	mg/kg	Coogan, Laurence A	Ion probe analysis
28	Samarium	Sm	mg/kg	Coogan, Laurence A	Ion probe analysis
29	Europium	Eu	mg/kg	Coogan, Laurence A	Ion probe analysis
30	Gadolinium	Gd	mg/kg	Coogan, Laurence A	Ion probe analysis	1
31	Gadolinium	Gd	mg/kg	Coogan, Laurence A	Ion probe analysis	2
32	Terbium	Tb	mg/kg	Coogan, Laurence A	Ion probe analysis
33	Dysprosium	Dy	mg/kg	Coogan, Laurence A	Ion probe analysis
34	Holmium	Ho	mg/kg	Coogan, Laurence A	Ion probe analysis
35	Erbium	Er	mg/kg	Coogan, Laurence A	Ion probe analysis
36	Ytterbium	Yb	mg/kg	Coogan, Laurence A	Ion probe analysis

License:

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

Size:

401 data points

Data

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

1 Ord No	2 Sample label (DSDP/ODP/IODP sample designation)	3 Pl [%]	4 Cpx [%]	5 Ol [%]	6 Sample comment (analysis)	7 Minerals (phase)	8 Comment (location)	9 SiO2 [%] (Electron Probe Microanalysis ...)	10 TiO2 [%] (Electron Probe Microanalysis ...)	11 Al2O3 [%] (Electron Probe Microanalysis ...)	12 Cr2O3 [%] (Electron Probe Microanalysis ...)	13 FeO [%] (total iron, Electron Probe Mi...)	14 MnO [%] (Electron Probe Microanalysis ...)	15 MgO [%] (Electron Probe Microanalysis ...)	16 CaO [%] (Electron Probe Microanalysis ...)	17 Na2O [%] (Electron Probe Microanalysis ...)	18 Ca/(Ca+Na+K) (Calculated)	19 Mg# (Calculated)	20 Ti [mg/kg] (Ion probe analysis)	21 Sr [mg/kg] (Ion probe analysis)	22 Y [mg/kg] (Ion probe analysis)	23 Zr [mg/kg] (Ion probe analysis)	24 La [mg/kg] (Ion probe analysis)	25 Ce [mg/kg] (Ion probe analysis)	26 Pr [mg/kg] (Ion probe analysis)	27 Nd [mg/kg] (Ion probe analysis)	28 Sm [mg/kg] (Ion probe analysis)	29 Eu [mg/kg] (Ion probe analysis)	30 Gd [mg/kg] (1, Ion probe analysis)	31 Gd [mg/kg] (2, Ion probe analysis)	32 Tb [mg/kg] (Ion probe analysis)	33 Dy [mg/kg] (Ion probe analysis)	34 Ho [mg/kg] (Ion probe analysis)	35 Er [mg/kg] (Ion probe analysis)	36 Yb [mg/kg] (Ion probe analysis)
1	153-923A-8R1-9,126-131	76.1	7.8	16.0	59	plagioclase	rim of cristal	52.52	0.03	30.35	0.02	0.19	0.00	0.02	13.66	3.84	66.2				0.26		0.40	1.13	0.14	0.73
2	153-923A-8R1-9,126-131				60	plagioclase	core of cristal	50.17	0.01	31.32	0.04	0.19	0.05	0.01	15.21	2.91	74.2				0.35		0.44	1.26	0.18	0.71
3	153-923A-12R1-4,30-38	25.2	37.8	36.6	77	plagioclase	rim of cristal	51.57	0.10	29.97	0.04	0.59	0.03	0.49	13.57	3.58	67.7				0.34		0.46	1.21	0.15	0.75
4	153-923A-12R1-4,30-38				76	plagioclase	core of cristal	49.85	0.07	30.99	0.01	0.25	0.03	0.01	14.99	3.01	73.3				0.60		0.15	0.41	0.07	0.41
5	153-923A-12R1-4,30-38				1	clinopyroxene	core of cristal	53.32	0.41	3.65	1.20	3.55	0.12	16.14	22.42	0.44		89.0	2016	8.47	11.15	6.83	0.12	0.64	0.18	1.38	0.88	0.34	1.35	1.25	0.31	2.25	0.43	1.25	1.22
6	153-923A-12R1-4,30-38				43	clinopyroxene	core of cristal	52.49	0.36	3.51	1.16	3.74	0.08	16.80	21.94	0.38		88.9	1906	9.96	12.82	7.55	0.20	0.75	0.25	1.83	1.04	0.38	2.05	1.57	0.31	2.39	0.43	1.67	1.83
7	153-923A-12R1-5,133139	60.2	1.5	38.1	37	plagioclase	rim of cristal	49.56	0.07	31.25	0.04	0.25	0.01	0.03	15.14	3.06	73.1			177.00	0.55		0.63	1.62	0.24	1.06
8	153-923A-12R1-5,133-139				95	plagioclase	core of cristal	51.33	0.05	30.23	0.04	0.32	0.03	0.02	13.61	3.80	66.2				0.57		0.23	0.68	0.11	0.51
9	153-923A-13R2-6B,68-75	67.5	6.7	25.4	71	plagioclase	rim of cristal	53.07	0.08	28.60	0.03	0.22	0.03	0.01	11.84	4.90	57.1				0.36		0.50	1.27	0.17	0.76
10	153-923A-13R2-6B,68-75				72	plagioclase	core of cristal	50.39	0.04	30.85	0.01	0.24	0.00	0.02	14.45	3.42	69.9				0.60		0.11	0.38	0.06	0.29
11	153-923A-16R1-2,17-19	67.4	23.6	8.9	30	plagioclase	rim of cristal	51.58	0.08	30.51	0.02	0.23	0.02	0.04	13.78	3.80	66.6				0.28		0.36	1.00	0.14	0.62
12	153-923A-16R1-2,17-19				41	plagioclase	core of cristal	50.13	0.01	30.54	0.01	0.27	0.02	0.02	14.66	3.22	71.4				0.36		0.10	0.29	0.04	0.28
13	153-923A-16R1-2,17-19				26	clinopyroxene	core of cristal	53.75	0.38	2.35	0.43	4.59	0.15	18.58	20.70	0.35		87.8	1972		11.49	6.24	0.12	0.71	0.19	1.56	1.00	0.36	1.57	1.73	0.31	2.23	0.41	1.24	1.25
14	153-923A-16R1-2,17-19				27	clinopyroxene	core of cristal	53.27	0.44	2.51	0.38	4.49	0.13	17.25	21.20	0.37		87.3	1976		11.31	6.43	0.14	0.74	0.20	1.75	0.99	0.33	1.59	1.44	0.32	2.15	0.41	1.30	1.24
15	153-923A-16R1-2,17-19				37	clinopyroxene	core of cristal	53.03	0.52	3.11	0.30	4.98	0.13	17.58	20.56	0.32		86.3	2801		15.64	9.86	0.16	0.93	0.29	2.03	1.24	0.53	2.09	2.17	0.38	2.90	0.59	1.61	1.54
16	153-923A-16R3-1,3-6	63.4	5.8	29.4	6	plagioclase	rim of cristal	52.20	0.02	29.50	0.05	0.20	0.03	0.04	12.95	4.19	62.9			180.00	0.64		1.08	2.63	0.35	1.74
17	153-923A-16R3-1,3-6				4	plagioclase	core of cristal	50.72	0.02	30.57	0.00	0.26	0.03	0.05	14.46	3.47	69.6			179.00	0.75		0.31	1.13	0.15	0.98