Citation:

0012-821X(96)00153-7

Name: Element concentrations of amphiboles in ODP Hole 147-894G (Table 1)
Published: 1996
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Metamorphosed oceanic gabbros provide a record of the cooling history of the lower crust near mid-ocean ridges, but the temperature range, rate, and location of subsolidus events are poorly known. We combine hornblende-plagioclase thermometry, statistical analysis, and thermal models to estimate precisely the temperature, time, distance from axis, and duration of metamorphism in East Pacific Rise gabbros from Hess Deep, ODP Hole 894G. Metamorphic hornblende and plagioclase, which formed during microfracturing and sea water penetration, equilibrated at a mean temperature of 716 +/- 8°C (90% confidence level). Comparison of the properties of the observed temperature distribution with those of model events indicates that metamorphism spanned <= 60°C. When combined with thermal models of fast-spreading centers, this implies that metamorphism was rapid (<= 6000 yr) and occurred 1-4 km off axis. Application of this approach to other gabbros will allow comparison of spatial and temporal characteristics of deformation and fluid flow in the lower oceanic crust as a function of ridge setting.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 2.299600 * Longitude: -101.525000

Date/Time Start: 1993-01-13T21:00:00 * Date/Time End: 1993-01-15T06:30:00

Minimum DEPTH, sediment/rock: 45.9 m * Maximum DEPTH, sediment/rock: 128.6 m

Event(s):

147-894G * Latitude: 2.299600 * Longitude: -101.525000 * Date/Time Start: 1993-01-13T21:00:00 * Date/Time End: 1993-01-15T06:30:00 * Elevation: -3034.0 m * Penetration: 154.5 m * Recovery: 45.15 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 127.5 m cored; 0 m drilled; 35.4 % recovery

Comment:

# of ions give the cations per 23 anhydrous oxygens

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Sample code/label	Sample label		Manning, Craig E	DSDP/ODP/IODP sample designation
3	Sample code/label 2	Sample label 2		Manning, Craig E
4	Silicon dioxide	SiO2	%	Manning, Craig E
5	Titanium dioxide	TiO2	%	Manning, Craig E
6	Aluminium oxide	Al2O3	%	Manning, Craig E
7	Iron oxide, FeO	FeO	%	Manning, Craig E
8	Manganese oxide	MnO	%	Manning, Craig E
9	Magnesium oxide	MgO	%	Manning, Craig E
10	Calcium oxide	CaO	%	Manning, Craig E
11	Sodium oxide	Na2O	%	Manning, Craig E
12	Potassium oxide	K2O	%	Manning, Craig E
13	Silicon	Si	# of ions	Manning, Craig E
14	Aluminium (IV)	Al(IV)	# of ions	Manning, Craig E
15	Aluminium (VI)	Al(VI)	# of ions	Manning, Craig E
16	Titanium	Ti	# of ions	Manning, Craig E
17	Iron 3+	Fe3+	# of ions	Manning, Craig E
18	Magnesium	Mg	# of ions	Manning, Craig E
19	Iron 2+	Fe2+	# of ions	Manning, Craig E
20	Manganese	Mn	# of ions	Manning, Craig E
21	Sodium	Na	# of ions	Manning, Craig E
22	Calcium	Ca	# of ions	Manning, Craig E
23	Potassium	K	# of ions	Manning, Craig E
24	Fraction	Fraction		Manning, Craig E		plagioclase compositions in terms of mole fraction of anorthite, XAn = Ca/(Ca + Na)
25	Temperature, calculated	T cal	°C	Manning, Craig E	Calculated	metamorphic

License:

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

Size:

240 data points

Data

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

1 Depth sed [m]	2 Sample label	3 Sample label 2	4 SiO2 [%]	5 TiO2 [%]	6 Al2O3 [%]	7 FeO [%]	8 MnO [%]	9 MgO [%]	10 CaO [%]	11 Na2O [%]	12 K2O [%]	13 Si [# of ions]	14 Al(IV) [# of ions]	15 Al(VI) [# of ions]	16 Ti [# of ions]	17 Fe3+ [# of ions]	18 Mg [# of ions]	19 Fe2+ [# of ions]	20 Mn [# of ions]	21 Na [# of ions]	22 Ca [# of ions]	23 K [# of ions]	24 Fraction	25 T cal [°C]
45.9	147-894G-4R-1,9	a6	46.25	0.13	9.15	15.37	0.28	11.88	11.45	1.64	0.06	6.855	1.145	0.453	0.014	0.483	2.624	1.422	0.036	1.818	0.470	0.011	0.802	734
48.2	147-894G-4R-2,7	a50	43.93	0.56	10.46	17.69	0.19	10.20	11.80	1.97	0.20	6.575	1.425	0.421	0.063	0.480	2.275	1.733	0.024	1.892	0.573	0.039	0.479	712
71.1	147-894G-8R-1,10	16a2	47.73	0.82	6.74	15.91	0.24	12.11	11.44	1.31	0.18	7.072	0.928	0.249	0.091	0.407	2.675	1.564	0.029	1.816	0.377	0.034	0.476	729
71.1	147-894G-8R-1,10	20a3	48.84	0.50	6.88	15.39	0.21	12.09	11.79	1.14	0.15	7.177	0.823	0.367	0.055	0.308	2.648	1.584	0.026	1.855	0.325	0.028	0.449	654
78.7	147-894G-9R-4,11	a20	43.98	0.27	12.66	11.79	0.27	14.43	10.95	2.56	0.12	6.347	1.653	0.501	0.030	0.785	3.105	0.638	0.032	1.693	0.715	0.019	0.708	801
78.7	147-894G-9R-4,11	a24	52.97	0.32	3.71	9.70	0.21	19.18	10.21	0.65	0.02	7.494	0.506	0.113	0.034	0.289	4.043	0.859	0.026	1.547	0.177	0.004	0.615	737
98.1	147-894G-12R-3,3	13	51.36	0.39	5.04	12.54	0.23	15.80	11.39	0.78	0.09	7.350	0.650	0.200	0.042	0.316	3.370	1.185	0.028	1.746	0.217	0.017	0.566	710
105.2	147-894G-13R-1,11	59a4	50.99	0.50	4.61	15.09	0.30	13.68	11.56	0.56	0.10	7.425	0.575	0.216	0.055	0.232	2.970	1.606	0.037	1.804	0.157	0.019	0.553	667
127.8	147-894G-17R-1,13	18	51.40	0.15	4.05	16.15	0.26	13.80	10.77	0.62	0.00	7.503	0.497	0.199	0.017	0.257	3.004	1.715	0.033	1.684	0.177	0.001	0.354	633
128.6	147-894G-17R-1,1	a8	50.65	0.33	5.08	12.32	0.18	15.02	11.94	0.84	0.11	7.344	0.656	0.212	0.036	0.385	3.247	1.108	0.022	1.856	0.325	0.020	0.688	738