Citation:

dsdp.proc.83.113.1985

Name: (Table 1) Strontium concentration and isotope ratios of carbonates from DSDP Holes 69-504B as well as 83-504B and fish debris samples from Indian and Pacific Ocean sediments
Published: 1985
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Recent revisions of the geological time scale by Kent and Gradstein (in press) suggest that, on the average, Cretaceous magnetic anomalies are approximately 10 m.y. older than in Larson and Hilde's (1975) previous time scale. These revised basement ages change estimates for the duration of alteration in the ocean crust, based on the difference between secondary-mineral isochron ages and magnetic isochron-crustal ages, from 3 to approximately 13 m.y.

In addition to the revised time scale, Burke et al.'s (1982) new data on the temporal variation of 87Sr/86Sr in seawater allow a better understanding of the timing of alteration and more realistic determinations of water/rock ratios during seawater-basalt interaction. Carbonates from all DSDP sites which reached Layer 2 of Atlantic crust (Sites 105, 332, 417, and 418) are deposited within 10-15 m.y. of crustal formation from solutions with 87Sr/86Sr ratios identical to unaltered or contemporaneous seawater. Comparisons of the revised seawater curve with the 87Sr/86Sr of basement carbonates is consistent with a duration of approximately 10-15 m.y. for alteration in the ocean crust.

Our preliminary Sr and 87Sr/86Sr data for carbonates from Hole 504B, on 5.9-m.y.-old crust south of the Costa Rica Rift, suggest that hydrous solutions from which carbonates precipitated contained substantial amounts of basaltic Sr. For this reason, carbonate 87Sr/86Sr cannot be used to estimate the duration of alteration at this site. A basalt-dominated alteration environment at Hole 504B is consistent with heat-flow evidence which indicates rapid sediment burial of crust at the Costa Rica Rift, sealing it from access by seawater and resulting in unusually low water/rock ratios during alteration.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Median Latitude: -2.757150 * Median Longitude: -160.140100 * South-bound Latitude: -19.483000 * West-bound Longitude: 80.983000 * North-bound Latitude: 6.000000 * East-bound Longitude: -83.730200

Date/Time Start: 1964-05-30T00:00:00 * Date/Time End: 1982-01-02T00:00:00

Minimum DEPTH, sediment/rock: 1.5 m * Maximum DEPTH, sediment/rock: 4.6 m

Event(s):

69-504B * Latitude: 1.227200 * Longitude: -83.730200 * Date/Time: 1979-10-07T00:00:00 * Elevation: -3460.0 m * Penetration: 489 m * Recovery: 262 m * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL)

83-504B * Latitude: 1.227200 * Longitude: -83.730200 * Date/Time Start: 1981-11-22T00:00:00 * Date/Time End: 1982-01-02T00:00:00 * Elevation: -3460.0 m * Penetration: 1350 m * Recovery: 107.7 m * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: Leg 83 of DSDP was devoted entirely to coring and experiments in Hole 504B, the deepest borehole to date into the oceanic crust. Hole 504B now extends over a kilometer into basement, nearly twice as far as any other DSDP hole, and it is the only DSDP hole to have clearly penetrated into the intrusive sheeted dikes that underlie the extrusive pillow lavas of the upper oceanic crust. At Hole 504B, Leg 83 continued an ongoing DSDP effort that began during Legs 68, 69, and 70 in 1979, and also included part of Leg 92 in 1983. 71 cores; 514 m cored; 0 m drilled; 21 % recovery

DODO-037P * Latitude: 6.000000 * Longitude: 165.917000 * Date/Time: 1964-05-30T00:00:00 * Elevation: -5014.0 m * Campaign: * Basis: Argo * Method/Device: Piston corer (PC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	Sample code/label	Sample label		Staudigel, Hubert	DSDP/ODP/IODP sample designation
6	Depth, top/min	Depth top	m	Staudigel, Hubert
7	Depth, bottom/max	Depth bot	m	Staudigel, Hubert
8	DEPTH, sediment/rock	Depth sed	m			Geocode
9	Identification	ID		Staudigel, Hubert
10	Age, minimum/young	Age min	ka	Staudigel, Hubert
11	Age, maximum/old	Age max	ka	Staudigel, Hubert
12	Strontium	Sr	mg/kg	Staudigel, Hubert
13	Strontium-87/Strontium-86 ratio	87Sr/86Sr		Staudigel, Hubert		87Sr/86Sr data are normalized to Eimer and Amend Sr-carbonate = 0.7080
14	Strontium-87/Strontium-86 ratio, error	87Sr/86Sr e	±	Staudigel, Hubert

License:

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

Size:

33 data points

Data

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

1 Event	2 Latitude	3 Longitude	4 Elevation [m]	5 Sample label	6 Depth top [m]	7 Depth bot [m]	8 Depth sed [m]	9 ID	10 Age min [ka]	11 Age max [ka]	12 Sr [mg/kg]	13 87Sr/86Sr	14 87Sr/86Sr e [±]
69-504B	1.2272	-83.7302	-3460	69-504B-4-5,12-20				Aragonite			1658.0	0.70866	0.00005
83-504B	1.2272	-83.7302	-3460	83-504B-80-2,52-54				Calcite			28.9	0.70411	0.00005
83-504B	1.2272	-83.7302	-3460	83-504B-80-2,72-80				Calcite			23.3	0.70414	0.00005
DODO-037P	6.0000	165.9170	-5014	DODO-037P,440-480	4.4	4.8	4.6	Fish debris	15000	17000	1431.0	0.70874	0.00004
DODO-108P	-19.4830	80.9830	-4050	DODO-108P,130-170	1.3	1.7	1.5	Fish debris	36000	39500	1480.0	0.70784	0.00003