Citation:

feart.2019.00164

Name: Depth, estimated age, and associated geochemical information from sediment core PRGL 1-4
Published: 2019-06-19
License: https://creativecommons.org/licenses/by/4.0/
Keywords: 86Sr/87Sr carbonate; Detrital carbonate export; Glacial – Interglacial; Source to sink; Strontium isotope stratigraphy

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Abstract:

The terrigenous sedimentary budget of passive margin records variations in past sedimentary fluxes, and thus can be used to infer past variations of Earth surface deformation processes, or climate change. Accurate estimates of sediment fluxes over various times scale and space-scale are therefore crucial. Traditionally, offshore sediment sequence volumes take into account only siliciclastic accumulation, the carbonate fraction being considered only as in-situ production (i.e. CaCO3). Here we propose a new geochemical methodology to decipher and quantify the amount of detrital carbonates in comparison to in-situ produced biogenic carbonates. This isotopic approach enables taking into account the export of detrital carbonates, and investigating its effect on sediment budgets. This study, located in the Gulf of Lion, is based on a 300 m long sediment borehole located near the shelf break and covering the last 500 000 years (i.e. 5 glacial-interglacial periods). 86Sr/87Sr isotopic data (0.70809 to 0.70858) are significantly less radiogenic than modern seawater (i.e. 0.7092) and show fluctuations in agreement with stratigraphic and climatic variations. These results suggest an unsuspected high export of detrital carbonates from the catchment area during both glacial (between 55 to 85% of the sedimentary carbonate fraction) and interglacial (between 30 to 50%) conditions. Thus, not only do detrital carbonate fluxes need to be factored into sediment flux calculations, these results suggest that detrital carbonate components could potentially have a strong influence on carbonate 86Sr/87Sr ratios when not obtained from microdrilled biogenic carbonates, such as the entirety of the Precambrian Sr chemostratigraphic record.

Keyword(s):

86Sr/87Sr carbonate; Detrital carbonate export; Glacial – Interglacial; Source to sink; Strontium isotope stratigraphy

Further details:

Supplementary data (Table S2 & S3) used in Pasquier et al., 2019

Project(s):

Profiles across Mediterranean Sedimentary Systems (PROMESS)

Funding:

Fifth Framework Programme (FP5), grant/award no. EVR1-CT-2002-40024 : Profiles across Mediterranean Sedimentary Systems

Coverage:

Latitude: 42.690000 * Longitude: 3.838000

Minimum DEPTH, sediment/rock: 72.10 m * Maximum DEPTH, sediment/rock: 110.05 m

Event(s):

PRGL_1-4 * Latitude: 42.690000 * Longitude: 3.838000 * Elevation: -298.0 m * Location: Golf of Lion * Campaign: * Basis: Bavenit * Method/Device: Core drilling (CDRILL)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Pasquier, Virgil
2	Sample material	Samp mat		Pasquier, Virgil
3	DEPTH, sediment/rock	Depth sed	m	Pasquier, Virgil		Geocode – in mbsf
4	AGE	Age	ka BP	Pasquier, Virgil		Geocode
5	Strontium-87/Strontium-86 ratio	87Sr/86Sr		Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)
6	Calcium carbonate	CaCO3	%	Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)
7	Strontium	Sr	mg/kg	Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)
8	Calcium	Ca	mg/kg	Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)
9	Magnesium	Mg	mg/kg	Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)
10	Aluminium	Al	mg/kg	Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)
11	Barium	Ba	mg/kg	Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)
12	Potassium	K	mg/kg	Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)
13	Sodium	Na	mg/kg	Pasquier, Virgil	Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS)

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

224 data points

Data

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

1 Event	2 Samp mat	3 Depth sed [m]	4 Age [ka BP]	5 87Sr/86Sr	6 CaCO3 [%]	7 Sr [mg/kg]	8 Ca [mg/kg]	9 Mg [mg/kg]	10 Al [mg/kg]	11 Ba [mg/kg]	12 K [mg/kg]	13 Na [mg/kg]
PRGL_1-4	Bulk	72.10	123.83	0.70858	41.1	2162	1054994	29764	1403	130	4122	25764
PRGL_1-4	Bulk	74.07	132.13	0.70838	41.3	2160	854626	35075	1065	98	2730	21503
PRGL_1-4	Bulk	81.68	137.66	0.70823	39.4	2278	1049403	47191	1277	110	3749	34852
PRGL_1-4	Bulk	85.53	140.44	0.70810	42.4	1922	854095	29529	1015	80	2528	23028
PRGL_1-4	Bulk	88.49	142.59	0.70809	35.3	2447	1098259	32693	2196	158	5557	37810
PRGL_1-4	Bulk	91.13	144.50	0.70811	35.8	2813	1226483	38468	3298	206	5120	39827
PRGL_1-4	Bulk	93.25	146.05	0.70823	36.8	2759	1059182	43978	1686	128	3783	31137
PRGL_1-4	Bulk	95.12	147.03	0.70824	33.2	3186	1226532	51657	2523	155	5852	44310
PRGL_1-4	Bulk	100.30	149.21	0.70826	31.6	2728	1071100	47909	4488	206	6060	52921
PRGL_1-4	Bulk	104.88	151.49	0.70825	32.9	2806	993573	43279	2290	181	5140	38386
PRGL_1-4	Bulk	105.21	151.96	0.70824	31.0	2915	1086069	48838	3037	194	5344	39857
PRGL_1-4	Bulk	110.05	158.81	0.70831	29.5	3021	1172656	53929	2997	218	6295	49967
	Dura nee river			0.70787	32.8	396	143529	832	66	16	30	85
	Drome river			0.70743	40.3	255	102446	656	47	14	21	59
	Aude river			0.70809	22.5	313	392075	2788	188	28	48	253
	Herault river			0.70855	12.0	58	63607	4534	155	26	40	141
	Fier river			0.70769	21.2	444	253147	1449	104	9	42	129
	Arve river			0.70797	22.4	803	310609	2078	137	12	58	168
	Aygues river			0.70741	27.4	295	207734	1111	88	23	23	64
	Ardeche river			0.70765	2.0	6231	3150068	23299	26984	2366	7984	17132
	Gard river			0.70841	2.6	1755	3328970	17824	8987	819	3892	12168
	Agly river			0.70798	5.8	1144	1052816	32556	1233	111	445	1859
	Pure calcite	72.10		0.70921
	Pure calcite	88.50		0.70919