Ishikawa, Tsuyoshi; Nakamura, Eizo (1992): (Table 1) B content, d11B, δ¹⁸O, degree of alteration, and lithology of basalts from ODP Hole 504B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.707686
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Abstract:
Boron contents and boron isotopic compositions were determined for the uppermost 1.3 km section of typical 6.2 Ma oceanic crust from DSDP/ODP Hole 504B, Costa Rica Rift, Galapagos Spreading Center. Both the boron content and the d11B value in the oceanic crust are controlled by two types of alteration:
1. (1) low-temperature alteration (0 to 60°C; Zones I and II) and
2. (2) high-temperature hydrothermal alteration (200 to 400°C; Zones III and IV).
Basalts subjected to the low-temperature alteration are characterized by their relatively high boron contents (0.69 to 19.3 ppm) and high d11B values (+2.2 to +10.6‰), indicating uptake of boron into secondary phases in equilibrium with seawater or evolved seawater. Hydrothermally altered basalts contain less abundant boron (0.17 to 0.52 ppm) and relatively constant d11B values (?0.1 to +1.0‰). Although basalts from the upper part of these hydrothermal zones (<1300 mbsf) show equilibrated boron content and d11B value with aqueous fluid, effective leaching of boron from basalt is predominant in the lower part (>1300 mbsf). Original boron content and d11B value of the Hole 504B MORB were 0.35 ppm and +0.2‰, respectively. The present data provide fundamental information in understanding of the distribution of boron and boron isotopes in the oceanic crust.
Related to:
Ishikawa, Tsuyoshi; Nakamura, Eizo (1992): Boron isotope geochemistry of the oceanic crust from DSDP/ODP Hole 504B. Geochimica et Cosmochimica Acta, 56(4), 1633-1639, https://doi.org/10.1016/0016-7037(92)90230-G
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 1.227050 * Median Longitude: -83.730250 * South-bound Latitude: 1.226900 * West-bound Longitude: -83.730300 * North-bound Latitude: 1.227200 * East-bound Longitude: -83.730200
Date/Time Start: 1981-11-22T00:00:00 * Date/Time End: 1986-10-16T18:15:00
Minimum DEPTH, sediment/rock: 275.6 m * Maximum DEPTH, sediment/rock: 1548.7 m
Event(s):
83-504B * Latitude: 1.227200 * Longitude: -83.730200 * Date/Time Start: 1981-11-22T00:00:00 * Date/Time End: 1982-01-02T00:00:00 * Elevation: -3460.0 m * Penetration: 1350 m * Recovery: 107.7 m * Campaign: Leg83 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: Leg 83 of DSDP was devoted entirely to coring and experiments in Hole 504B, the deepest borehole to date into the oceanic crust. Hole 504B now extends over a kilometer into basement, nearly twice as far as any other DSDP hole, and it is the only DSDP hole to have clearly penetrated into the intrusive sheeted dikes that underlie the extrusive pillow lavas of the upper oceanic crust. At Hole 504B, Leg 83 continued an ongoing DSDP effort that began during Legs 68, 69, and 70 in 1979, and also included part of Leg 92 in 1983. 71 cores; 514 m cored; 0 m drilled; 21 % recovery
111-504B * Latitude: 1.226900 * Longitude: -83.730300 * Date/Time Start: 1986-10-05T11:45:00 * Date/Time End: 1986-10-16T18:15:00 * Elevation: -3474.0 m * Penetration: 1562.1 m * Recovery: 27.36 m * Location: North Pacific Ocean * Campaign: Leg111 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 209 m cored; 0 m drilled; 13.1 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Sample code/label | Sample label | Ishikawa, Tsuyoshi | DSDP/ODP/IODP sample designation | ||
| 4 | Lithologic unit/sequence | Unit | Ishikawa, Tsuyoshi | |||
| 5 | Rock type | Rock | Ishikawa, Tsuyoshi | |||
| 6 | Boron | B | mg/kg | Ishikawa, Tsuyoshi | Isotope dilution mass spectrometry | |
| 7 | δ11B | δ11B | ‰ SRM | Ishikawa, Tsuyoshi | Mass spectrometer Finnigan MAT 261 | |
| 8 | δ11B | δ11B | ‰ SRM | Ishikawa, Tsuyoshi | Calculated | error 2 sigma |
| 9 | δ18O | δ18O | ‰ | Ishikawa, Tsuyoshi | Mass spectrometer Finnigan MAT 261 | |
| 10 | Alteration | Alteration | Ishikawa, Tsuyoshi | in % |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
130 data points