Citation:

epic.28217.d001

Name: (Table 1) Strontium isotope data for marine carbonates of sediment core CRP-3
Creator: Mark Lavelle
Published: 2001
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Strontium isotope stratigraphy was used to date 5 discrete horizons within the CRP-3 drillhole. A single in situ modiolid bivalve fragment at 10.88 mbsf gives an age of 30.9 (±0.8) Ma for the associated sediment. The four remaining well preserved fragments recovered from 29.94-190.31 mbsf are within error of this age, indicating a high sedimentation rate and suggesting little time is missing in disconformities. The diagenetic alteration of carbonate macrofossils by continental fluids (and possibly seawater) is a common feature to 320 mbsf.

Project(s):

Cape Roberts Project (CRP)

Coverage:

Latitude: -77.006000 * Longitude: 163.719000

Date/Time Start: 1999-10-09T00:00:00 * Date/Time End: 1999-11-19T00:00:00

Minimum Elevation: -295.0 m * Maximum Elevation: -295.0 m

Event(s):

CRP-3 * Latitude: -77.006000 * Longitude: 163.719000 * Date/Time Start: 1999-10-09T00:00:00 * Date/Time End: 1999-11-19T00:00:00 * Elevation: -295.0 m * Penetration: 939 m * Recovery: 936 m * Location: Ross Sea * Campaign: * Basis: Sampling/drilling from ice * Method/Device: Core wireline system (CWS) * Comment: 11.76 km at 76° true from Cape Roberts, 2.04 km at 225° true from CRP-2. Fast ice thickness: 2.0 to 2.2 m. Sea rise embedded to 9.55 mbsf. Lateral ice movement from spudding 5.0 m to 82° true. HQ core to 345.85 mbsf. NQ core to 939.42 mbsf. Core recovery 97%. Phase 1 logging to 345 mbsf, Phase 2 logging to 773 mbsf, Phase 3 logging to 918 mbsf. Deepest Cenozoic lithology and depth: sandstone breccia from 822.87 to 823.11 mbsf. Age of oldest Cenozoic strata: earliest Oligocene or latest Eocene. Deepest core lithology and depth: light red-brown quartz-cemented quartz sandstone to 939.42 mbsf. Age of bedrock: (mid?) Devonian.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Depth, top/min	Depth top	m	Lavelle, Mark
2	Depth, bottom/max	Depth bot	m	Lavelle, Mark
3	Lithologic unit/sequence	Unit		Lavelle, Mark
4	Sample type	Samp type		Lavelle, Mark
5	Shell debris	Shells		Lavelle, Mark		Shell type
6	Preservation	Preserv		Lavelle, Mark
7	Comment	Comment		Lavelle, Mark		Taphonomy
8	Strontium-87/Strontium-86 ratio	87Sr/86Sr		Lavelle, Mark	Isotope ratio mass spectrometry	Normalised to long-term laboratory standard NIST-987 = 0.7210248
9	Strontium-87/Strontium-86 ratio, error	87Sr/86Sr e	±	Lavelle, Mark		2SE
10	Age, dated	Age dated	ka	Lavelle, Mark	Age, strontium isotope, LOWESS fit Howarth & McArthur (1997)
11	Age, dated, range, minimum	Age dated min	ka	Lavelle, Mark	Age, strontium isotope, LOWESS fit Howarth & McArthur (1997)
12	Age, dated, range, maximum	Age dated max	ka	Lavelle, Mark	Age, strontium isotope, LOWESS fit Howarth & McArthur (1997)

License:

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

Size:

150 data points

Data

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

1 Depth top [m]	2 Depth bot [m]	3 Unit	4 Samp type	5 Shells	6 Preserv	7 Comment	8 87Sr/86Sr	9 87Sr/86Sr e [±]	10 Age dated [ka]	11 Age dated min [ka]	12 Age dated max [ka]
10.88	10.89	1.1	Modiolid bivalve	Articulated	Well preserved	In situ	0.707949	0.000020	30900	30100	31700
29.94	29.96	1.2	Pectinid bivalve	Fragments	Well preserved	Uncertain	0.707946	0.000012	31000	30200	31700
47.55	47.57	1.2	Pectinid bivalve	Fragments	Well preserved	Uncertain	0.707949	0.000017	30900	30100	31700
81.29	81.39	1.4	Sandy mudstone	Water	not applicable	not applicable	0.711362	0.000016
89.02	89.03	2.1	Unidentified bivalve	Fragments	Partially recrystallised	Uncertain	0.707988	0.000017
124.96	125.01	3.1	Echinoid plates	Fragments	Partially recrystallised	Uncertain	0.708048	0.000020
127.48	127.50	3.1	Unidentified bivalve	Fragments	Partially recrystallised	Uncertain	0.708328	0.000020
190.29	190.31	6.1	Pectinid bivalve	Fragments	Well preserved	Uncertain	0.707946	0.000018	31000	30200	31700
190.29	190.31	6.1	Pectinid bivalve	Fragments	Well preserved	Uncertain	0.707934	0.000024	31300	30500	32100
190.50	190.52	6.1	Unidentified bivalve	Articulated	Partially recrystallised	In situ	0.708357	0.000030
197.61	197.64	6.1	Unidentified bivalve	Fragments	Partially recrystallised	Uncertain	0.708249	0.000021
198.79	198.81	6.1	Unidentified shell	Fragments	Partially recrystallised	Uncertain	0.708224	0.000020
225.47	225.57	7.2	Sandy mudstone	Water	not applicable	not applicable	0.711073	0.000020
247.27	247.31	7.2	Unidentified shell	Fragments	Partially recrystallised	Uncertain	0.710497	0.000021
320.36	320.38	8.1	Unidentified bivalve	Fragments	Partially recrystallised	Uncertain	0.708072	0.000024