(Table 1) Geochemistry of ash layers at DSDP Leg 57 Holes
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
1980
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| _version_ | 1867170033909628928 |
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| author | Cadet, Jean-Paul Fujioka, Kantaro |
| author_facet | Cadet, Jean-Paul Fujioka, Kantaro |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_822114 |
| institution | PANGAEA |
| language | en |
| publishDate | 1980 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Geochemistry of ash layers at DSDP Leg 57 Holes Cadet, Jean-Paul Fujioka, Kantaro 57-438A; 57-438B; 57-439; 57-440; 57-440B; Aluminium oxide; Calcium oxide; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Elevation of event; Epoch; Event label; Glomar Challenger; Iron oxide, FeO; Latitude of event; Leg57; Longitude of event; Magnesium oxide; Manganese oxide; North Pacific/BASIN; North Pacific/TRENCH; Potassium oxide; Sample code/label; Silicon dioxide; Sodium oxide; Titanium dioxide; Total 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. |
| title | (Table 1) Geochemistry of ash layers at DSDP Leg 57 Holes |
| topic | 57-438A; 57-438B; 57-439; 57-440; 57-440B; Aluminium oxide; Calcium oxide; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Elevation of event; Epoch; Event label; Glomar Challenger; Iron oxide, FeO; Latitude of event; Leg57; Longitude of event; Magnesium oxide; Manganese oxide; North Pacific/BASIN; North Pacific/TRENCH; Potassium oxide; Sample code/label; Silicon dioxide; Sodium oxide; Titanium dioxide; Total |
| url | https://doi.org/10.1594/PANGAEA.822114 |