Citation:

dsdp.proc.72.117.1983

Name: (Table 1) K, Rb, Cs, Sr, and 87Sr/86Sr in vein materials from DSDP Hole 72-516F
Published: 1983
License: https://creativecommons.org/licenses/by/3.0/

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Published: 1983 (exact date unknown) • DOI registered: 2013-06-10

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Abstract:

A well-constrained Rb/Sr isochron of secondary celadonites and carbonate from DSDP Hole 516F yields an age of 70.1 ± 1.6 Ma. This age is younger than the age of crust formation (about 82 Ma) and may provide evidence for a shortlived hydrothermal event on the Rio Grande Rise caused by a phase of off-ridge volcanism. The initial 87Sr/86Sr ratios of the celandonites and carbonate are lower than the contemporaneous seawater and indicate that the dissolved load of the hydrous solutions contains approximately 2% of basaltic component. K, Rb, and Cs contents in Hole 516F celadonites are similar to corresponding phases from DSDP Hole 417A, indicating that the upper crust at this site may represent a significant sink for seawater alkalies. The alkali ratios K/Rb and K/Cs of Hole 516F celadonites are also similar to the ratios in celadonites from 108-Ma-old crust at DSDP Holes 417 and 418. This correspondence shows that the K/Rb and K/Cs ratios in seawater remained essentially constant during the Cretaceous, from 108 to 70 Ma.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Latitude: -30.276500 * Longitude: -35.285000

Date/Time Start: 1980-03-11T00:00:00 * Date/Time End: 1980-03-11T00:00:00

Minimum DEPTH, sediment/rock: 3.7 m * Maximum DEPTH, sediment/rock: 4.9 m

Event(s):

72-516F * Latitude: -30.276500 * Longitude: -35.285000 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 1270.6 m * Recovery: 690.1 m * Location: South Atlantic/CONT RISE * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 127 cores; 1092.5 m cored; 9 m drilled; 63.2 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Hart, Stanley R	DSDP/ODP/IODP sample designation
2	Piece	Piece		Hart, Stanley R
3	Identification	ID		Hart, Stanley R
4	Description	Description		Hart, Stanley R
5	DEPTH, sediment/rock	Depth sed	m			Geocode – mbsf
6	Potassium	K	%	Hart, Stanley R	see reference(s)
7	Potassium	K	mg/kg	Hart, Stanley R	see reference(s)
8	Rubidium	Rb	mg/kg	Hart, Stanley R	see reference(s)
9	Caesium	Cs	mg/kg	Hart, Stanley R	see reference(s)
10	Strontium	Sr	mg/kg	Hart, Stanley R	see reference(s)
11	Strontium-87/Strontium-86 ratio	87Sr/86Sr		Hart, Stanley R	see reference(s)	Data relative to 0.70800 for E & A standard
12	Strontium-87/Strontium-86 ratio, error	87Sr/86Sr e	±	Hart, Stanley R	see reference(s)	2sigma in-run statistics

License:

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

Size:

60 data points

Data

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

1 Sample label	2 Piece	3 ID	4 Description	5 Depth sed [m]	6 K [%]	7 K [mg/kg]	8 Rb [mg/kg]	9 Cs [mg/kg]	10 Sr [mg/kg]	11 87Sr/86Sr	12 87Sr/86Sr e [±]
72-516F-126-3,135-140	5d	1	Celadonite	4.6	4.140		171.600	1.4100	26.64	0.72520	0.00005
72-516F-126-3,86-88	4a	2	Celadonite-smectite mix	4.1	2.249		84.510	0.6040	64.23	0.71094	0.00005
72-516F-126-4,22-25	2b	3	Celadonite	4.9	3.702		132.400	0.8920	93.25	0.71121	0.00005
72-516F-126-3,47-51	2f	4	Celadonite	3.7	3.893		139.900	0.9310	95.03	0.71127	0.00005
72-516F-126-4,15-18	2a	5	Celadonite-smectite mix	4.8	1.746		67.820	0.7460	191.20	0.70786	0.00004
72-516F-126-4,15-18	2d	6	Calcite	4.8		9.68	0.037	0.0052	87.79	0.70694	0.00015