Barnes, Jaime D; Cisneros, Miguel (2012): (Table 2) Chlorine geochemistry and mineralogy of altered oceanic crust samples [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.812212, Supplement to: Barnes, JD; Cisneros, M (2012): Mineralogical control on the chlorine isotope composition of altered oceanic crust. Chemical Geology, 326-327, 51-60, https://doi.org/10.1016/j.chemgeo.2012.07.022
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Abstract:
Bulk chlorine concentrations and chlorine stable isotope compositions were determined for hydrothermally altered basalt (extrusive lavas and sheeted dikes) and gabbro samples (n = 50) from seven DSDP/ODP/IODP drill sites. These altered oceanic crust (AOC) samples span a range of crustal ages, tectonic settings, alteration type, and crustal depth. Bulk chlorine concentrations range from < 0.01 wt.% to 0.09 wt.%. In general, higher chlorine concentrations coincide with an increase in temperature of alteration and amphibole content. d37Cl values of whole rock AOC samples range from -1.4 to +1.8 per mil. High d37Cl values (>=~0.5 per mil) are associated with areas of higher amphibole content. This observation is consistent with theoretical calculations that estimate amphibole should be enriched in 37Cl compared to co-existing fluid. Negative to near zero d37Cl values are found in areas dominated by clay minerals. Chlorine geochemistry is a rough indicator of metamorphic grade and mineralogy. AOC is a major Cl host in the subducting oceanic lithospheric slab. Here we show that bulk chlorine concentrations are ~3 times higher than previous estimates resulting in a greater contribution of Cl to the mantle.
Project(s):
Coverage:
Median Latitude: 7.672489 * Median Longitude: -35.986768 * South-bound Latitude: -32.724000 * West-bound Longitude: -101.525000 * North-bound Latitude: 36.878700 * East-bound Longitude: 156.359800
Date/Time Start: 1974-06-17T00:00:00 * Date/Time End: 2002-11-23T03:45:00
Minimum DEPTH, sediment/rock: 1.60 m * Maximum DEPTH, sediment/rock: 2090.00 m
Event(s):
37-332B * Latitude: 36.878700 * Longitude: -33.641000 * Date/Time: 1974-06-17T00:00:00 * Elevation: -1806.0 m * Penetration: 721.5 m * Recovery: 122.9 m * Location: North Atlantic/VALLEY * Campaign: Leg37 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 582.5 m cored; 0 m drilled; 19.4 % recovery
52-418A * Latitude: 25.035000 * Longitude: -68.057300 * Date/Time: 1977-02-10T00:00:00 * Elevation: -5511.0 m * Penetration: 570.5 m * Recovery: 205.5 m * Location: North Atlantic/CONT RISE * Campaign: Leg52 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 374 m cored; 0 m drilled; 54.9 % recovery
53-418A * Latitude: 25.035000 * Longitude: -68.057300 * Date/Time: 1977-03-15T00:00:00 * Elevation: -5514.0 m * Penetration: 868 m * Recovery: 234 m * Campaign: Leg53 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 306.4 m cored; 0 m drilled; 76.4 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | Sample code/label | Sample label | Barnes, Jaime D | DSDP/ODP/IODP sample designation | ||
| 6 | DEPTH, sediment/rock | Depth sed | m | Geocode – mbsf | ||
| 7 | Lithology/composition/facies | Lithology | Barnes, Jaime D | |||
| 8 | Chlorine | Cl | % | Barnes, Jaime D | Instrumental neutron activation analysis (INAA) (Reimann et al., 1998) | wt.% |
| 9 | δ37Cl | δ37Cl | ‰ | Barnes, Jaime D | Mass spectrometer, Finnigan, MAT 253 | |
| 10 | Amphibole | Amp | % | Barnes, Jaime D | X-ray diffraction (XRD) | wt.%, 0 = below detection limit |
| 11 | Chlorite | Chl | % | Barnes, Jaime D | X-ray diffraction (XRD) | wt.%, 0 = below detection limit |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
293 data points