Citation:

odp.proc.sr.127128-2.204.1992

Name: (Table 1) Geochemistry of realatively fresh rocks of ODP Sites 127-794 and 127-797
Creator: Peter Thy
Published: 1992
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The flows and sills drilled at Sites 794 and 797 in the Yamato Basin of the Japan Sea are subalkalic, olivine, and/or plagioclase phyric basalts. Compositionally, the rocks can be divided into a depleted, low-K type and an enriched, relatively high-K type. In addition, two contrasting evolution trends are reflected in the rock compositions, which allow four different magmatic suites to be identified. It is suggested that the depleted or enriched nature of these suites represent primary characteristics, while the different evolution trends are related to fractionation processes in crustal magma chambers. A tholeiitic evolution trend, with increasing FeO and TiO2 and decreasing Al2O3, can be modelled by fractional crystallization of 40%-50% plagioclase, olivine, and augite. A mildly calc-alkalic evolution trend, with decreasing FeO, increasing Al2O3, and nearly constant TiO2, can be modelled by 8%-12% olivine fractionation. Mineralogical evidence suggests that these differences may be related to the effect of small amounts of water during crystallization of the calc-alkalic suites. The tholeiitic suites occur in the lower parts of the drill cores, while the calc-alkalic suites occur in the upper parts. This suggests a complex tectonic and magmatic evolution, perhaps reflecting a transition between calc-alkalic magmatism related to subduction zone activity and tholeiitic magmatism related to back-arc spreading. Furthermore, any magmatic model must be able to account for the range in parental magmas from depleted to enriched throughout the tectonic history of the Yamato Basin.

Related to:

Tamaki, Kensaku; Pisciotto, Kenneth A; Allan, J; et al. (1990): Proceedings of the Ocean Drilling Program, 127 Initial Reports. Proceedings of the Ocean Drilling Program, Ocean Drilling Program, 127, 844 pp, https://doi.org/10.2973/odp.proc.ir.127.1990

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 39.403000 * Median Longitude: 136.383500 * South-bound Latitude: 38.616000 * West-bound Longitude: 134.536000 * North-bound Latitude: 40.190000 * East-bound Longitude: 138.231000

Date/Time Start: 1989-06-26T00:00:00 * Date/Time End: 1989-08-18T17:00:00

Minimum Elevation: -2876.0 m * Maximum Elevation: -2821.3 m

Event(s):

127-794 * Latitude: 40.190000 * Longitude: 138.231000 * Date/Time Start: 1989-06-26T00:00:00 * Date/Time End: 1989-07-11T00:00:00 * Elevation: -2821.3 m * Penetration: 1554 m * Recovery: 422.8 m * Location: Japan Sea * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 78 cores; 694.4 m cored; 0 m drilled; 60.9% recovery

127-797C * Latitude: 38.616000 * Longitude: 134.536000 * Date/Time Start: 1989-08-04T17:00:00 * Date/Time End: 1989-08-18T17:00:00 * Elevation: -2876.0 m * Penetration: 900.1 m * Recovery: 164.18 m * Location: Japan Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 416.1 m cored; 0 m drilled; 39.5 % recovery

Comment:

Relative unaltered samples, analyzed shipboard.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device
1	Event label	Event
2	Sample code/label	Sample label		Thy, Peter	DSDP/ODP/IODP sample designation
3	Sample comment	Sample comment		Thy, Peter	X-ray fluorescence (XRF)
4	Silicon dioxide	SiO2	%	Thy, Peter	X-ray fluorescence (XRF)
5	Titanium dioxide	TiO2	%	Thy, Peter	X-ray fluorescence (XRF)
6	Aluminium oxide	Al2O3	%	Thy, Peter	X-ray fluorescence (XRF)
7	Iron oxide, Fe2O3	Fe2O3	%	Thy, Peter	X-ray fluorescence (XRF)
8	Iron oxide, FeO	FeO	%	Thy, Peter	X-ray fluorescence (XRF)
9	Manganese oxide	MnO	%	Thy, Peter	X-ray fluorescence (XRF)
10	Magnesium oxide	MgO	%	Thy, Peter	X-ray fluorescence (XRF)
11	Calcium oxide	CaO	%	Thy, Peter	X-ray fluorescence (XRF)
12	Sodium oxide	Na2O	%	Thy, Peter	X-ray fluorescence (XRF)
13	Potassium oxide	K2O	%	Thy, Peter	X-ray fluorescence (XRF)
14	Phosphorus pentoxide	P2O5	%	Thy, Peter	X-ray fluorescence (XRF)
15	Magnesium number	Mg#		Thy, Peter	X-ray fluorescence (XRF)
16	Zirconium	Zr	mg/kg	Thy, Peter	X-ray fluorescence (XRF)
17	Nickel	Ni	mg/kg	Thy, Peter	X-ray fluorescence (XRF)

License:

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

Size:

304 data points

Data

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

1 Event	2 Sample label	3 Sample comment	4 SiO2 [%]	5 TiO2 [%]	6 Al2O3 [%]	7 Fe2O3 [%]	8 FeO [%]	9 MnO [%]	10 MgO [%]	11 CaO [%]	12 Na2O [%]	13 K2O [%]	14 P2O5 [%]	15 Mg#	16 Zr [mg/kg]	17 Ni [mg/kg]
127-794	127-794C-2R-1,34-36	upper suite	51.24	1.38	18.97	1.22	7.08	0.13	5.74	9.43	3.82	0.69	0.30	0.591	103	15
127-794	127-794C-3R-1,122-124	upper suite	49.87	1.13	20.89	1.14	6.89	0.12	5.37	10.60	3.26	0.54	0.20	0.582	77	16
127-794	127-794C-4R-1,42-44	upper suite	50.52	1.08	19.96	1.12	6.70	0.13	5.90	10.46	3.34	0.59	0.22	0.611	88	17
127-794	128-794D-3R-3,89-94	upper suite	50.63	1.29	18.32	1.33	7.91	0.12	6.65	9.61	3.29	0.63	0.21	0.600	90	21
127-794	127-794C-12R-4,85-86	upper suite	51.39	1.33	17.11	1.03	6.49	0.16	9.50	9.17	2.86	0.72	0.23	0.723	108	80
127-794	128-794D-13R-1,81-84	lower suite	49.61	1.54	15.34	1.59	9.17	0.18	8.43	10.84	2.89	0.24	0.16	0.621	90	129
127-794	128-794D-14R-1,81-84	lower suite	50.05	1.67	15.37	1.65	9.19	0.21	7.20	11.01	3.23	0.24	0.17	0.583	95	117
127-794	128-794D-17R-1,97-100	lower suite	49.52	1.56	17.80	1.30	7.92	0.28	7.59	10.94	2.69	0.21	0.18	0.631	97	108
127-794	128-794D-18R-1,44-47	lower suite	50.06	1.69	18.05	1.14	6.89	0.27	7.49	10.91	3.06	0.22	0.19	0.660	107	124
127-794	128-794D-19R-1,11-14	lower suite	48.95	1.53	17.49	1.39	8.33	0.20	8.08	10.73	2.94	0.20	0.17	0.634	92	137
127-794	128-794D-20R-1,20-23	lower suite	48.44	1.50	16.90	1.40	8.46	0.21	9.50	10.33	2.86	0.22	0.17	0.667	92	124
127-797C	127-797C-10R-1,90-92	upper suite	50.83	1.13	19.34	1.02	5.92	0.42	6.29	11.00	3.08	0.11	0.14	0.654	97	150
127-797C	127-797C-12R-2,81-83	upper suite	48.38	0.97	18.00	1.12	6.62	0.17	9.98	11.38	3.22	0.06	0.11	0.729	77	163
127-797C	127-797C-12R-4,35-37	upper suite	48.49	0.96	18.08	1.09	6.55	0.16	10.12	11.29	3.09	0.05	0.12	0.734	75	165
127-797C	127-797C-13R-2,70-72	upper suite	49.58	1.00	18.60	1.10	6.38	0.32	7.62	11.92	3.34	0.04	0.10	0.680	73	145
127-797C	127-797C-18R-3,60-62	upper suite	49.94	0.91	18.36	1.05	6.09	0.34	8.04	11.69	3.43	0.06	0.09	0.702	54	102
127-797C	127-797C-19R-2,42-44	upper suite	50.26	0.90	18.38	0.97	5.75	0.29	8.31	11.83	3.16	0.07	0.08	0.720	54	101
127-797C	127-797C-24R-5,38-40	upper suite	49.15	0.94	17.82	1.15	6.82	0.18	8.96	11.87	2.87	0.12	0.10	0.701	67	94
127-797C	127-797C-31R-2,36-38	lower suite	51.86	1.70	15.39	1.52	8.18	0.20	6.33	10.36	3.66	0.54	0.25	0.580	160	36