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Manning, Craig E; Weston, Patricia E; Mahon, Keith I (1996): Element concentrations of amphiboles in ODP Hole 147-894G (Table 1). PANGAEA,, Supplement to: Manning, CE et al. (1996): Rapid high-temperature metamorphism of East Pacific Rise gabbros from Hess Deep. Earth and Planetary Science Letters, 144(1-2), 123-132,

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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.
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
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: Leg147 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 127.5 m cored; 0 m drilled; 35.4 % recovery
# of ions give the cations per 23 anhydrous oxygens
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Sample code/labelSample labelManning, Craig EODP sample designation
3Sample code/label 2Sample label 2Manning, Craig E
4Silicon dioxideSiO2%Manning, Craig E
5Titanium dioxideTiO2%Manning, Craig E
6Aluminium oxideAl2O3%Manning, Craig E
7Iron oxide, FeOFeO%Manning, Craig E
8Manganese oxideMnO%Manning, Craig E
9Magnesium oxideMgO%Manning, Craig E
10Calcium oxideCaO%Manning, Craig E
11Sodium oxideNa2O%Manning, Craig E
12Potassium oxideK2O%Manning, Craig E
13SiliconSi# of ionsManning, Craig E
14Aluminium (IV)Al(IV)# of ionsManning, Craig E
15Aluminium (VI)Al(VI)# of ionsManning, Craig E
16TitaniumTi# of ionsManning, Craig E
17Iron 3+Fe3+# of ionsManning, Craig E
18MagnesiumMg# of ionsManning, Craig E
19Iron 2+Fe2+# of ionsManning, Craig E
20ManganeseMn# of ionsManning, Craig E
21SodiumNa# of ionsManning, Craig E
22CalciumCa# of ionsManning, Craig E
23PotassiumK# of ionsManning, Craig E
24FractionFractionManning, Craig Eplagioclase compositions in terms of mole fraction of anorthite, XAn = Ca/(Ca + Na)
25Temperature, calculatedT cal°CManning, Craig ECalculatedmetamorphic
240 data points

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