Cadet, Jean-Paul; Fujioka, Kantaro (1980): (Table 1) Geochemistry of ash layers at DSDP Leg 57 Holes [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.822114, Supplement to: Cadet, J-P; Fujioka, K (1980): Neogene volcanic ashes and explosive volcanism: Japan Trench transect, Leg 57, Deep Sea Drilling Project. In: Scientific Party, Initial Reports of the Deep Sea Drilling Project, 56/57 (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 56-57, 1027-1041, https://doi.org/10.2973/dsdp.proc.5657.138.1980
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Abstract:
The study of the main characteristics of ash layers in Leg 57 cores shows that they are suitable for an analysis of the effect on eruptive activity of their distribution. We found (1) sediment recovery good and ash layers numerous; (2) sedimentary environment generally free from terrigenous clastic material; (3) reworking limited; (4) volcanic glass very acidic, ranging from rhyolitic to rhyodacitic composition; and (5) alteration and diagenesis negligible above the lower Miocene.
The curves of explosive volcanic activity in Holes 438, 439, and 440 display two stages of high activity: an early one around 16 m.y. and a late one starting 5 m.y. B.P., both stages being separated by an upper Miocene quiescence. Detail in these results is limited by the chemical composition of the glass and accounts only for trends in explosive acid volcanism. Nevertheless, results are roughly in agreement with other data from the Northwest Pacific, although some discrepancies in the correlation of intensity of the episodes occur. The data from Leg 57 support the hypothesis of synchronous pulses in explosive volcanism.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 40.272180 * Median Longitude: 143.530200 * South-bound Latitude: 39.735500 * West-bound Longitude: 143.235800 * North-bound Latitude: 40.630000 * East-bound Longitude: 143.929000
Date/Time Start: 1977-10-19T00:00:00 * Date/Time End: 1977-11-10T00:00:00
Minimum Elevation: -4509.0 m * Maximum Elevation: -1558.0 m
Event(s):
57-438A * Latitude: 40.629800 * Longitude: 143.235800 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1558.0 m * Penetration: 878 m * Recovery: 535.5 m * Location: North Pacific/BASIN * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 83 cores; 780.5 m cored; 0 m drilled; 68.6 % recovery
57-438B * Latitude: 40.630000 * Longitude: 143.246700 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1564.0 m * Penetration: 1040.7 m * Recovery: 84.2 m * Location: North Pacific/BASIN * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 206.5 m cored; 0 m drilled; 40.8 % recovery
57-439 * Latitude: 40.626800 * Longitude: 143.310500 * Date/Time: 1977-11-03T00:00:00 * Elevation: -1656.0 m * Penetration: 1157.5 m * Recovery: 160 m * Location: North Pacific/TRENCH * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 333.5 m cored; 0 m drilled; 48 % 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 | Cadet, Jean-Paul | DSDP/ODP/IODP sample designation | ||
| 6 | Epoch | Epoch | Cadet, Jean-Paul | |||
| 7 | Silicon dioxide | SiO2 | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 8 | Titanium dioxide | TiO2 | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 9 | Aluminium oxide | Al2O3 | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 10 | Iron oxide, FeO | FeO | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 11 | Manganese oxide | MnO | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 12 | Magnesium oxide | MgO | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 13 | Calcium oxide | CaO | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 14 | Sodium oxide | Na2O | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 15 | Potassium oxide | K2O | % | Cadet, Jean-Paul | Electron microprobe (EMP) | |
| 16 | Total | Total | % | Cadet, Jean-Paul | Electron microprobe (EMP) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
180 data points