Citation:

PANGAEA.708593

Name: (Table 2) Composition of the deapest pore fluids from ODP Holes 168-1030B and 168-1031A
Published: 2002
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

On the eastern flank of the Juan de Fuca Ridge, reaction between upwelling basement fluid and sediment alters hydrothermal fluxes of Ca, SiO2(aq), SO4, PO4, NH4, and alkalinity. We used the Global Implicit Multicomponent Reactive Transport (GIMRT) code to model the processes occurring in the sediment column (diagenesis, sediment burial, fluid advection, and multicomponent diffusion) and to estimate net seafloor fluxes of solutes. Within the sediment section, the reactions controlling the concentrations of the solutes listed above are organic matter degradation via SO4 reduction, dissolution of amorphous silica, reductive dissolution of amorphous Fe(III)-(hydr)oxide, and precipitation of calcite, carbonate fluorapatite, and amorphous Fe(II)-sulfide. Rates of specific discharge estimated from pore-water Mg profiles are 2 to 3 mm/yr. At this site the basement hydrothermal system is a source of NH4, SiO2(aq), and Ca, and a sink of SO4, PO4, and alkalinity. Reaction within the sediment column increases the hydrothermal sources of NH4 and SiO2(aq), increases the hydrothermal sinks of SO4 and PO4, and decreases the hydrothermal source of Ca. Reaction within the sediment column has a spatially variable effect on the hydrothermal flux of alkalinity.

Because the model we used was capable of simulating the observed pore-water chemistry by using mechanistic descriptions of the biogeochemical processes occurring in the sediment column, it could be used to examine the physical controls on hydrothermal fluxes of solutes in this setting. Two series of simulations in which we varied fluid flow rate (1 to 100 mm/yr) and sediment thickness (10 to 100 m) predict that given the reactions modeled in this study, the sediment section will contribute most significantly to fluxes of SO4 and NH4 at slow flow rates and intermediate sediment thickness and to fluxes of SiO2(aq) at slow flow rates and large sediment thickness. Reaction within the sediment section could approximately double the hydrothermal sink of PO4 over a range of flow rates and sediment thickness, and could slightly decrease (by </=10%) the size of the hydrothermal source of Ca.

Related to:

Giambalvo, Emily R; Steefel, Carl I; Fisher, Andrew T; Rosenberg, Nina D; Wheat, C Geoffrey (2002): Effect of fluid-sediment reaction on hydrothermal fluxes of major elements, eastern flank of the Juan de Fuca Ridge. Geochimica et Cosmochimica Acta, 66(10), 1739-1757, https://doi.org/10.1016/S0016-7037(01)00878-X

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 47.893750 * Median Longitude: -128.563500 * South-bound Latitude: 47.890000 * West-bound Longitude: -128.566000 * North-bound Latitude: 47.897500 * East-bound Longitude: -128.561000

Date/Time Start: 1996-08-10T00:15:00 * Date/Time End: 1996-08-10T14:15:00

Minimum Elevation: -2588.0 m * Maximum Elevation: -2573.0 m

Event(s):

168-1030B * Latitude: 47.897500 * Longitude: -128.561000 * Date/Time: 1996-08-10T00:15:00 * Elevation: -2573.0 m * Penetration: 48.5 m * Recovery: 44.11 m * Location: Juan de Fuca Ridge, North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 48.5 m cored; 0 m drilled; 90.9 % recovery

168-1031A * Latitude: 47.890000 * Longitude: -128.566000 * Date/Time: 1996-08-10T14:15:00 * Elevation: -2588.0 m * Penetration: 42.8 m * Recovery: 42.56 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 42.8 m cored; 0 m drilled; 99.4 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	Carbon dioxide	CO2	%	Giambalvo, Emily R	aqueous
6	Ammonium	[NH4]+	µg/g	Giambalvo, Emily R
7	Magnesium	Mg2+	mg/kg	Giambalvo, Emily R
8	Calcium	Ca2+	mg/kg	Giambalvo, Emily R
9	Potassium	K	mg/kg	Giambalvo, Emily R
10	Sulfate	[SO4]2-	mg/kg	Giambalvo, Emily R
11	Phosphorus, aqueous phase	P(aq)	µg/kg	Giambalvo, Emily R	in H2PO4
12	Silicon	Si	mg/kg	Giambalvo, Emily R	in SiO2 aqueous
13	Sodium	Na	mg/kg	Giambalvo, Emily R
14	Chloride	Cl	mg/kg	Giambalvo, Emily R
15	Hydrogen sulfide	H2S	ppmv	Giambalvo, Emily R	aqueous
16	Iron	Fe	mg/kg	Giambalvo, Emily R	assumed to be all Fe(II)
17	Manganese	Mn	mg/kg	Giambalvo, Emily R	assumed to be all Mn(II)
18	Boron	B	mg/kg	Giambalvo, Emily R	in B(OH)3 aqueous
19	Fluorine	F	mg/kg	Giambalvo, Emily R
20	Oxygen	O2	mg/kg	Giambalvo, Emily R	aqueous
21	Nitrate	[NO3]-	ng/g	Giambalvo, Emily R
22	Alkalinity, total	AT	mmol(eq)/l	Giambalvo, Emily R
23	pH	pH		Giambalvo, Emily R

License:

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

Size:

38 data points

Data

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

1 Event	2 Latitude	3 Longitude	4 Elevation [m]	5 CO2 [%]	6 [NH4]+ [µg/g]	7 Mg2+ [mg/kg]	8 Ca2+ [mg/kg]	9 K [mg/kg]	10 [SO4]2- [mg/kg]	11 P(aq) [µg/kg]	12 Si [mg/kg]	13 Na [mg/kg]	14 Cl [mg/kg]	15 H2S [ppmv]	16 Fe [mg/kg]	17 Mn [mg/kg]	18 B [mg/kg]	19 F [mg/kg]	20 O2 [mg/kg]	21 [NO3]- [ng/g]	22 AT [mmol(eq)/l]	23 pH
168-1030B	47.8975	-128.5610	-2573	0.000165	3.716	138	2289	251	2145	0.403	6.21	10817	19772	0.00535	0.1843	1.747	4.454	0.325	0.000000000032	62	0.474	8.55
168-1031A	47.8900	-128.5660	-2588	0.000184	1.804	113	2416	256	2250	0.619	7.22	10768	19772	0.03057	0.0391	0.494	3.557	0.160	0.000000000032	62	0.402	8.46