Koyama, Masato; Cisowski, Stanley M; Gill, James B (1992): (Table 1) Summary of horizon, lithology, and paleomagnetic of ODP Hole 126-791B basaltic mousse samples [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.773474, Supplement to: Koyama, M et al. (1992): Paleomagnetic estimate of emplacement mechanisms of deep basaltic volcaniclastic rocks in the Sumisu Rift, Izu-Bonin Arc. In: Taylor, B; Fujioka, K; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 371-379, https://doi.org/10.2973/odp.proc.sr.126.144.1992
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Abstract:
A paleomagnetic study was made on the highly vesiculated basaltic tuff breccia (the basaltic mousse) drilled by Ocean Drilling Program Leg 126 from the Izu-Bonin backarc, Sumisu Rift, to estimate the mode of its emplacement. Thirty-four 10-cm**3 minicore samples were collected from almost all the horizons of the basaltic mousse. Stepwise thermal and alternating-field demagnetization experiments show that the natural remanent magnetizations of many samples are mainly composed of a single stable component. Although remanence inclinations are not expected to be disturbed by rotary drilling, the measured inclinations of remanence show a random directional distribution as a whole. The remanence inclinations, however, show directional consistency on a smaller scale. High-density sampling and measurements from a limited interval of drilled cores, and the measurement of small disks cut from a single minicore sample show that there is directional consistency over several centimeters. Strong and stable remanent magnetization, the existence of remanence direction consistency, and the fresh lithology of the samples suggest the thermal origin of remanence. Combining the paleomagnetic results with other geological, petrographical, and paleontological characters, the Hole 791B basaltic mousse can be interpreted as a subaqueous explosion breccia produced by deep-sea pyroclastic fountaining.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 30.916500 * Longitude: 139.870100
Date/Time Start: 1989-05-06T16:45:00 * Date/Time End: 1989-05-13T22:45:00
Minimum Elevation: -2279.0 m * Maximum Elevation: -2279.0 m
Event(s):
126-791B * Latitude: 30.916500 * Longitude: 139.870100 * Date/Time Start: 1989-05-06T16:45:00 * Date/Time End: 1989-05-13T22:45:00 * Elevation: -2279.0 m * Penetration: 1145 m * Recovery: 114.28 m * Location: Philippine Sea * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 77 cores; 738.2 m cored; 0 m drilled; 15.5 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Koyama, Masato | DSDP/ODP/IODP sample designation | ||
| 2 | Sample comment | Sample comment | Koyama, Masato | disk specimens divided from the same minicore are shown below the results of the original minicore with their position in the original minicore sample | ||
| 3 | Piece | Piece | Koyama, Masato | |||
| 4 | NRM, Declination | Decl (NRM) | deg | Koyama, Masato | ||
| 5 | NRM, Inclination | Incl (NRM) | deg | Koyama, Masato | ||
| 6 | NRM, Intensity | Inten (NRM) | mA/m | Koyama, Masato | ||
| 7 | Clastics | Clastics | % | Koyama, Masato | ||
| 8 | Demag Type | Demag Type | Koyama, Masato | |||
| 9 | Temperature, technical | T tech | °C | Koyama, Masato | mean blocking temperature of demagnetized sample | |
| 10 | Median demagnetizing field | MDF | mT | Koyama, Masato |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
378 data points
Data
| 1 Sample label | 2 Sample comment | 3 Piece | 4 Decl (NRM) [deg] | 5 Incl (NRM) [deg] | 6 Inten (NRM) [mA/m] | 7 Clastics [%] | 8 Demag Type | 9 T tech [°C] | 10 MDF [mT] |
|---|---|---|---|---|---|---|---|---|---|
| 126-791B-62R-1,75-77 | 4a | 56.4 | -72.2 | 738.0 | 20 | ||||
| 126-791B-64R-1,59-61 | 7 | 218.4 | 34.3 | 3170.0 | <5 | ||||
| 126-791B-64R-1,59-61 | Upper | 217.4 | 40.3 | 6370.0 | <5 | ||||
| 126-791B-64R-1,59-61 | Middle | 214.2 | 27.7 | 3660.0 | <5 | ||||
| 126-791B-64R-1,59-61 | Lower | 234.9 | 68.5 | 170.0 | 10 | ||||
| 126-791B-64R-2,36-38 | 4 | 159.8 | -30.4 | 2550.0 | 40 | thermal demagnetization | 300 | ||
| 126-791B-65R-1,48-50 | 8 | 260.5 | 4.6 | 12800.0 | 100 | thermal demagnetization | 370 | ||
| 126-791B-66R-1,52-54 | 11 | 40.7 | 46.8 | 410.0 | 40 | thermal demagnetization | 440 | ||
| 126-791B-66R-1,84-86 | 15 | 5.8 | -16.8 | 836.0 | 30 | thermal demagnetization | 380 | ||
| 126-791B-66R-1,84-86 | 15 | 359.8 | -79.6 | 4150.0 | 100 | ||||
| 126-791B-66R-1,103-105 | 17 | 312.0 | -19.9 | 343.0 | 30 | ||||
| 126-791B-66R-1,103-105 | Upper | 144.1 | -20.0 | 194.0 | 30 | ||||
| 126-791B-66R-1,103-105 | Middle | 339.3 | -5.3 | 132.0 | 30 | ||||
| 126-791B-66R-1,103-105 | Lower | 315.9 | -18.0 | 1090.0 | 15 | ||||
| 126-791B-66R-1,106-108 | 17 | 99.5 | -45.0 | 769.0 | <5 | ||||
| 126-791B-66R-1,109-111 | 17 | 12.6 | -5.0 | 4110.0 | 20 | ||||
| 126-791B-66R-1,122-124 | 19 | 355.3 | -3.7 | 317.0 | <5 | ||||
| 126-791B-66R-1,125-127 | 19 | 23.7 | 72.1 | 1040.0 | <5 | ||||
| 126-791B-66R-1,126-128 | 19 | 41.8 | 66.0 | 1510.0 | 35 | ||||
| 126-791B-66R-1,126-128 | Upper | 36.3 | 63.6 | 614.0 | 30 | ||||
| 126-791B-66R-1,126-128 | Middle | 87.8 | 73.3 | 710.0 | 30 | ||||
| 126-791B-66R-1,126-128 | Lower | 30.7 | 68.4 | 3490.0 | 40 | ||||
| 126-791B-66R-1,132-134 | 19 | 24.2 | 59.2 | 5420.0 | 60 | ||||
| 126-791B-66R-1,132-134 | Upper | 21.9 | 42.5 | 390.0 | <5 | ||||
| 126-791B-66R-1,132-134 | Upper middle | 15.8 | 58.6 | 5850.0 | 50 | ||||
| 126-791B-66R-1,132-134 | Lower middle | 12.9 | 58.4 | 10200.0 | 70 | ||||
| 126-791B-66R-1,132-134 | Lower | 24.0 | 57.9 | 18200.0 | 70 | ||||
| 126-791B-66R-2,0-2 | 1a | 83.2 | -11.5 | 11100.0 | 100 | thermal demagnetization | 405 | ||
| 126-791B-66R-2,5-7 | 1a | 221.0 | 39.5 | 261.0 | 10 | thermal demagnetization | 390 | ||
| 126-791B-66R-2,8-10 | 1a | 293.2 | -28.5 | 61.2 | <5 | thermal demagnetization | 410 | ||
| 126-791B-66R-2,10-12 | 1a | 84.8 | -23.4 | 9660.0 | 100 | alternating-field demagnetization | 46 | ||
| 126-791B-66R-2,17-19 | 1b | 196.7 | 11.2 | 698.0 | 10 | ||||
| 126-791B-66R-2,21-23 | 1b | 348.5 | 6.2 | 6100.0 | 55 | ||||
| 126-791B-66R-2,21-23 | Upper | 350.5 | 13.1 | 1620.0 | 30 | ||||
| 126-791B-66R-2,21-23 | Upper middle | 347.1 | 7.9 | 1990.0 | 50 | ||||
| 126-791B-66R-2,21-23 | Lower middle | 353.2 | 0.6 | 2120.0 | 70 | ||||
| 126-791B-66R-2,21-23 | Lower | 352.8 | -2.3 | 9550.0 | 50 | ||||
| 126-791B-66R-2,28-30 | 1c | 128.2 | -63.8 | 1180.0 | 10 | thermal demagnetization | 400 | ||
| 126-791B-66R-2,39-41 | 2 | 50.0 | -54.4 | 6890.0 | 100 | thermal demagnetization | 390 | ||
| 126-791B-67R-1,42-44 | 4b | 4.9 | 19.0 | 1250.0 | 25 | ||||
| 126-791B-67R-1,42-44 | Upper | 348.8 | -17.0 | 2970.0 | 30 | ||||
| 126-791B-67R-1,42-44 | Middle | 52.2 | 50.9 | 1080.0 | <5 | ||||
| 126-791B-67R-1,42-44 | Lower | 8.9 | 59.7 | 532.0 | 15 | ||||
| 126-791B-67R-1,62-64 | 5 | 316.7 | -18.3 | 140.0 | alternating-field demagnetization | 30 | |||
| 126-791B-67R-2,108-110 | 15 | 144.8 | 6.6 | 1880.0 | 20 | thermal demagnetization | 390 | ||
| 126-791B-67R-3,2-4 | 1 | 121.0 | -23.6 | 832.0 | 40 | thermal demagnetization | 390 | ||
| 126-791B-72R-2,3-5 | 1a | 293.4 | -42.1 | 205.0 | alternating-field demagnetization | 33 | |||
| 126-791B-72R-2,54-56 | 6a | 159.2 | -6.6 | 5260.0 | 60 | ||||
| 126-791B-72R-2,54-56 | Upper | 140.9 | -8.8 | 6370.0 | 80 | ||||
| 126-791B-72R-2,54-56 | Middle | 154.7 | -1.8 | 7020.0 | 60 | ||||
| 126-791B-72R-2,54-56 | Lower | 170.4 | -21.2 | 2840.0 | 30 | ||||
| 126-791B-72R-3,71-73 | 8 | 165.2 | 25.9 | 6950.0 | 70 | thermal demagnetization | 350 | ||
| 126-791B-73R-1,56-58 | 6c | 299.0 | 36.9 | 5070.0 | 50 | ||||
| 126-791B-73R-2,40-42 | 1c | 223.8 | -4.8 | 9720.0 | 90 | thermal demagnetization | 380 | ||
| 126-791B-73R-2,84-86 | 4c | 269.9 | 56.2 | 326.0 | 100 | thermal demagnetization | 90 | ||
| 126-791B-73R-3,35-37 | 3b | 324.9 | 67.3 | 1940.0 | 10 | alternating-field demagnetization | 33 | ||
| 126-791B-76R-1,46-48 | 8 | 245.0 | 12.3 | 14800.0 | 70 | thermal demagnetization | 360 |