Citation:

dsdp.proc.66.130.1982

Name: (Table 1) Geochemistry of Cocos Plate hemipelagic-pelagic sediments in DSDP Hole 66-487
Creator: Jeremy K Leggett
Published: 1982
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The sedimentary sequence recovered from Hole 487 documents northeast seafloor spreading on the Cocos Plate. A basal 65-meter unit of upper Miocene-Pliocene brown clay was deposited on the subsiding east flank of the East Pacific Rise. The overlying 105-meter unit of gray hemipelagic silt and mud was deposited when Site 487 drifted within reach of terrigenous sediment derived from the Mexican continental margin.

Analyses of 21 elements in 45 samples, taken at regular intervals up Hole 487, give a geochemical profile which shows metal enrichment in basal sediment similar to that observed in previously recovered basal sediment sections in the Eastern Pacific (e.g., von der Borch & Rex, 1970; von der Borch et al., 1971). This verifies that the basalt cored at the base the hole is oceanic basement, since the first sediment to be deposited on newly formed ocean crust is characteristically enriched in metals, particularly Fe and Mn. The metals precipitate from circulating hydrothermal-exhalative solutions which are an integral part of active ridge volcanism (summary in Jenkyns, 1978). In this chapter I discuss the geochemistry of the basal metalliferous sediment from Hole 487.

The geochemical data may also prove useful in studies of onshore volcanism: mass-balance calculations show that much (possibly all) of the incoming Cocos Plate sediment has been subducted since the Miocene (Watkins et al., this volume). It may have contributed to the genesis of magmas erupted in the Mexican volcanic arc

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Latitude: 15.853500 * Longitude: -99.175300

Date/Time Start: 1979-03-24T00:00:00 * Date/Time End: 1979-03-24T00:00:00

Minimum DEPTH, sediment/rock: 1.4 m * Maximum DEPTH, sediment/rock: 173.7 m

Event(s):

66-487 * Latitude: 15.853500 * Longitude: -99.175300 * Date/Time: 1979-03-24T00:00:00 * Elevation: -4764.0 m * Penetration: 190.5 m * Recovery: 119.6 m * Location: North Pacific/TRENCH * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 180.5 m cored; 9.5 m drilled; 66.3 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Leggett, Jeremy K	DSDP/ODP/IODP sample designation
2	DEPTH, sediment/rock	Depth sed	m			Geocode – mbsf
3	Sample ID	Sample ID		Leggett, Jeremy K
4	Aluminium	Al	%	Leggett, Jeremy K
5	Calcium	Ca	%	Leggett, Jeremy K
6	Iron	Fe	%	Leggett, Jeremy K
7	Manganese	Mn	%	Leggett, Jeremy K
8	Magnesium	Mg	%	Leggett, Jeremy K
9	Sodium	Na	%	Leggett, Jeremy K
10	Potassium	K	%	Leggett, Jeremy K
11	Titanium	Ti	%	Leggett, Jeremy K
12	Phosphorus	P	%	Leggett, Jeremy K
13	Barium	Ba	mg/kg	Leggett, Jeremy K
14	Cobalt	Co	mg/kg	Leggett, Jeremy K
15	Chromium	Cr	mg/kg	Leggett, Jeremy K
16	Copper	Cu	mg/kg	Leggett, Jeremy K
17	Lanthanum	La	mg/kg	Leggett, Jeremy K
18	Lithium	Li	mg/kg	Leggett, Jeremy K
19	Nickel	Ni	mg/kg	Leggett, Jeremy K
20	Molybdenum	Mo	mg/kg	Leggett, Jeremy K
21	Lead	Pb	mg/kg	Leggett, Jeremy K
22	Strontium	Sr	mg/kg	Leggett, Jeremy K
23	Zinc	Zn	mg/kg	Leggett, Jeremy K
24	Vanadium	V	mg/kg	Leggett, Jeremy K

License:

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

Size:

1024 data points

Data

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

1 Sample label	2 Depth sed [m]	3 Sample ID	4 Al [%]	5 Ca [%]	6 Fe [%]	7 Mn [%]	8 Mg [%]	9 Na [%]	10 K [%]	11 Ti [%]	12 P [%]	13 Ba [mg/kg]	14 Co [mg/kg]	15 Cr [mg/kg]	16 Cu [mg/kg]	17 La [mg/kg]	18 Li [mg/kg]	19 Ni [mg/kg]	20 Mo [mg/kg]	21 Pb [mg/kg]	22 Sr [mg/kg]	23 Zn [mg/kg]	24 V [mg/kg]
66-487-1-1,139-143	1.4	1	6.32	0.72	27.32	0.41	0.99	1.08	1.34	0.26	0.06	536	26	216	83	14	52	69	1006	191	165	306	171
66-487-2-2,32-36	2.8	2	8.20	1.22	4.96	0.16	1.68	1.96	1.17	0.47	0.08	1757	22		86	23	69	67	27	126	198	157	204
66-487-2-5,100-104	6.0	3	10.29	1.10	5.17	0.13	1.38	1.92	1.58	0.46	0.08	665	21	117	71	28	87	52	15	97	155	157	181
66-487-3-3,52-56	14.0	4	5.40	0.54	5.66	0.19	1.14	1.35	0.68	0.25	0.07	2163	19	105	81	28	47	62	21	28	146	155	125
66-487-5-2,94-98	31.9	5	8.89	1.32	5.12	1.39	1.66	1.88	1.18	0.46	0.10	831	23	89	114	22	74	84	31	101	186	188	229
66-487-6-3,60-65	42.6	6	8.36	0.89	5.08	0.29	1.57	1.63	1.15	0.43	0.08	962	23	68	106	24	74	83	23	94	164	238	212
66-487-7-2,66-71	50.7	7	8.83	0.94	5.25	0.50	1.58	1.65	1.32	0.43	0.07	994	23	74	119	24	75	92	25	88	167	199	211
66-487-8-1,69-73	58.7	8	8.40	1.07	5.46	0.66	1.73	2.22	1.26	0.43	0.09	1983	24		166	22	74	124	24	102	184	251	208
66-487-9-2,100-105	70.0	9	9.00	1.01	5.96	0.47	1.73	1.50	1.33	0.47	0.09	1382	26	87	175	26	77	146	28	112	192	314	236
66-487-9-5,38-43	73.8	10	8.93	1.44	5.64	0.22	1.71	2.30	1.34	0.30	0.11	1379	23	123	151	23	82	125	27	92	195	207	218
66-487-10-4,64-68	81.6	11	9.12	0.91	6.03	0.16	1.73	1.57	1.30	0.47	0.08	1292	27	78	172	26	80	133	28	101	198	217	246
66-487-11-1,98-102	87.5	12	8.49	0.84	5.66	0.08	1.61	2.00	1.32	0.40	0.06	1321	27	76	190	27	78	169	21	101	174	274	228
66-487-11-4,72-75	91.7	13	8.38	0.89	6.13	0.06	1.62	1.70	1.31	0.38	0.08	926	23	100	205	36	83	204	13	62	209	230	254
66-487-12-1,22-25	96.2	14	8.22	1.01	6.95	0.10	1.67	2.11	1.37	0.39	0.09	2569	25	83	255	40	74	168	38	166	221	246	209
66-487-12-1,99-104	97.0	15	8.22	0.94	5.95	0.11	1.53	2.17	1.46	0.38	0.08	1757	34	77	518	39	72	266	19	85	196	276	258
66-487-12-3,59-63	99.6	16	6.67	1.23	7.94	0.86	1.98	2.53	1.08	0.32	0.08	2184	58	57	645	34	62	397	27	100	204	364	308
66-487-13-1,7-12	105.6	17	8.56	0.87	6.85	0.15	1.80	2.09	1.20	0.39	0.13	3399	39	132	185	50	70	122	15	74	229	88	198
66-487-13-3,6-9	108.6	18	8.07	1.31	7.11	0.10	1.84	2.39	1.18	0.39	0.18	4706	40	132	251	56	57	128	16	97	281	203	199
66-487-14-2,20-25	116.7	19	5.61	1.27	13.23	3.66	1.60	1.86	0.94	0.30	0.37	5604	92	94	585	107	35	371	25	129	289	262	501
66-487-14-3,24-28	118.2	20	4.99	1.14	12.04	7.40	1.57	1.65	0.72	0.27	0.34	4955	50		509	82	32	259	21	138	267	241	467
66-487-15-1,79-83	125.3	21	4.88	0.72	11.45	2.28	1.71	2.69	0.78	0.23	0.18	2662	51	109	453	57	29	244	26	90	311	217	259
66-487-15-2,26-30	126.6	22	5.03	0.68	11.18	1.70	1.59	1.67	0.97	0.21	0.17	2357	42	75	407	60	29	201	16	76	285	226	226
66-487-15-6,99-103	133.0	23	4.89	1.03	12.92	2.53	2.00	2.23	0.73	0.26	0.24	3945	55	96	561	61	29	270	32	110	307	309	252
66-487-16-1,35-39	134.3	24	4.04	0.68	13.74	0.42	2.20	1.75	0.77	0.22	0.14	2837	34	58	333	70	31	266	24	76	255	325	406
66-487-16-1,98-102	135.0	25	4.47	1.21	12.92	1.90	1.88	1.98	0.78	0.22	0.36	2528	49	98	492	91	26	242	23	101	335	238	208
66-487-16-4,117-122	139.7	26	4.46	0.76	10.91	2.07	1.58	3.25	0.86	0.20	0.18	2496	49	92	398	58	24	228	22	86	306	213	243
66-487-17-1,84-89	144.3	27	3.25	1.45	8.26	18.99	1.64	1.05	0.48	0.15	0.26	1640	38	106	598	45	21	188	31	135	210	299	199
66-487-17-1,98-102	144.5	28	4.77	0.82	13.22	2.82	1.72	1.84	0.74	0.24	0.23	1732	73	83	547	106	28	235	21	142	358	224	303
66-487-17-2,69-79	145.7	29	4.74	0.86	13.59	3.01	1.55	2.02	0.70	0.24	0.31	4324	57	70	478	75	24	209	25	82	384	218	374
66-487-18-1,99-103	154.0	30	4.94	0.83	10.96	3.26	1.93	2.50	0.62	0.25	0.18	3357	52		324	65	33	127	48	83	333	238	217
66-487-18-1,146-150	154.5	31	7.06	1.03	5.41	1.23	2.38	1.84	0.50	0.26	0.09	1876	18		388	25	66	93	21	50	197	258	95
66-487-18-3,99-103	157.0	32	4.77	0.70	11.32	3.94	2.10	2.25	0.60	0.20	0.19	3030	28		594	50	51	153	50	84	279	302	304
66-487-18-4,99-103	158.0	33	2.88	0.90	20.36	8.33	1.72	1.29	0.65	0.16	0.48	3579	64		733	106	17	371	77	142	461	394	525
66-487-18-5,89-93	158.9	34	2.16	1.08	17.81	9.81	2.19	1.32	0.77	0.12	0.45	3391	55		698	83	18	449	75	131	437	392	350
66-487-18-6,98-102	160.0	35	2.14	1.06	16.81	8.42	2.07	1.92	0.76	0.12	0.47	4027	47	57	625	81	17	348	65	88	418	356	347
66-487-19-1,61-66	163.1	36	2.28	1.55	18.44	7.34	1.79	1.82	0.66	0.13	0.57	3213	55	77	752	88	16	325	38	115	623	362	516
66-487-19-2,29-31	164.3	37	2.71	1.92	17.01	5.10	1.94	2.20	0.96	0.13	0.77	1815	50		620	94	20	339	36	103	579	329	379
66-487-19-3,3-5	165.5	38	2.09	1.42	18.73	6.33	1.88	1.46	0.70	0.12	0.46	5215	56		654	84	17	302	53	127	656	373	479
66-487-19-4,93-95	167.9	39	2.89	1.27	15.68	6.26	2.37	1.59	1.02	0.15	0.37	2147	53	59	499	73	24	304	66	115	399	370	221
66-487-19-5,49-53	169.0	40	3.03	2.35	14.51	5.52	2.13	2.64	0.79	0.16	0.37	2776	45		528	70	20	271	73	100	415	307	295
66-487-19-5,78-80	169.2	41	4.90	5.20	14.64	4.49	2.80	1.33	0.44	0.29	0.30	732	55	173	439	55	15	241	83	95	337	246	382
66-487-19-5,149-150	170.0	42	5.82	6.07	11.24	3.13	3.17	1.72	0.32	0.34	0.21	1709	53	151	328	39	14	214	57	103	256	188	335
66-487-20-1,103-105	173.0	43	4.87	3.58	14.04	4.07	2.45	1.64	0.66	0.27	0.32	3513	58	76	465	68	19	259	60	159	355	261	365
66-487-20-2,4-6	173.5	44	5.46	4.18	12.90	3.52	2.66	1.73	0.51	0.31	0.27	2811	60	159	423	57	17	231	55	84	292	227	348
66-487-20-2,16-18	173.7	45	6.89	6.81	11.04	2.33	3.25	1.80	0.35	0.40	0.18	3687	55	166	277	35	13	189	70	115	218	178	355