Citation:

j.chemgeo.2014.06.010

Name: (Table 1) Amount of calcium carbonate precipitation researched in IODP Hole 329-U1368C
Published: 2016-02-02
License: https://creativecommons.org/licenses/by/3.0/

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Published: 2016-02-02 • DOI registered: 2016-05-10

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Abstract:

Dissolved inorganic carbon (DIC) concentration and total alkalinity in marine sediment vary with biological activity, mineral diagenesis and past bottom ocean water composition. Reliable interpretation of this data is often compromised due to precipitation of calcium carbonate (CaCO3) during sediment recovery, processing and sample storage.

Here we present and test a method that corrects for this precipitation and consequently allows quantification of in situ carbonate system chemistry. Our method relies on the over-determination of the dissolved carbonate system by (i) measuring DIC, alkalinity and calcium, and (ii) explicitly assuming CaCO3 saturation in the sediment. We experimentally tested this method using data from Integrated Ocean Drilling Program (IODP) Site U1368 in the South Pacific Gyre. Our results show that we can accurately reproduce in situ aqueous carbonate system chemistry if DIC, alkalinity and calcium concentration are measured simultaneously. At Site U1368, the correction for sampling associated precipitation is equivalent to 4.5 and 8.9% of the measured DIC and alkalinity, respectively. The method is well suited for any sediment porewater that is saturated with respect to calcium carbonate; consequently, it is applicable for approximately 50% of the global oceanic seafloor.

Project(s):

Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)

Ocean Drilling Program (ODP)

Coverage:

Latitude: -27.916527 * Longitude: -123.161135

Minimum DEPTH, sediment/rock: 0.05 m * Maximum DEPTH, sediment/rock: 15.48 m

Event(s):

329-U1368C * Latitude: -27.916527 * Longitude: -123.161135 * Elevation: -3738.5 m * Recovery: 16.34 m * Campaign: (South Pacific Gyre Microbiology) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	DEPTH, sediment/rock	Depth sed	m	Sauvage, Justine	Geocode – in mbsf
2	Calcium carbonate excess	CaCO3 xs	mmol/kg	Sauvage, Justine
3	Sample comment	Sample comment		Sauvage, Justine

License:

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

Size:

66 data points

Data

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

1 Depth sed [m]	2 CaCO3 xs [mmol/kg]	3 Sample comment
0.55	0.12270	Conventionally processed samples
1.05	0.12900	Conventionally processed samples
2.05	0.09194	Conventionally processed samples
2.55	0.12860	Conventionally processed samples
3.55	0.10780	Conventionally processed samples
4.05	0.12150	Conventionally processed samples
5.05	0.10590	Conventionally processed samples
5.55	0.13320	Conventionally processed samples
6.55	0.13080	Conventionally processed samples
7.05	0.07662	Conventionally processed samples
7.76	0.02430	Conventionally processed samples
8.45	0.11400	Conventionally processed samples
9.05	0.13020	Conventionally processed samples
10.05	0.07246	Conventionally processed samples
10.55	0.09799	Conventionally processed samples
11.55	0.14270	Conventionally processed samples
12.05	0.16280	Conventionally processed samples
13.05	0.14720	Conventionally processed samples
13.55	0.11290	Conventionally processed samples
14.55	0.09184	Conventionally processed samples
15.05	0.12860	Conventionally processed samples
15.48	0.02601	Conventionally processed samples
0.05	0.00963	Rapidly processed samples
1.45	0.02640	Rapidly processed samples
2.95	0.03551	Rapidly processed samples
4.45	0.05762	Rapidly processed samples
5.95	0.12810	Rapidly processed samples
7.45	0.09690	Rapidly processed samples
9.45	0.08132	Rapidly processed samples
10.95	0.06369	Rapidly processed samples
12.45	0.08038	Rapidly processed samples
13.95	0.09114	Rapidly processed samples
15.45	0.06216	Rapidly processed samples