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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
1983
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.816349 |
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| _version_ | 1867167670559834112 |
|---|---|
| author | Schmincke, Hans-Ulrich |
| author_facet | Schmincke, Hans-Ulrich |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Ashes occurring both as distinct layers and mixed with pelagic sediments of the hydrothermal mounds lying south of the Galapagos Rift are mainly rhyolitic and basaltic. The ashes, of rhyolitic to intermediate composition, appear to belong to a calc-alkalic series and were probably derived from Plinian eruptions in Ecuador or Colombia. Basaltic ashes are made of nonvesicular sideromelane spalling shards and are of tholeiitic composition. They probably were derived locally from fault scarps. Most rhyolitic and basaltic glass shards studied are fresh except for hydration of the rhyolitic shards. Some shards are severely altered, however. Basaltic ash may be more common in pelagic sediments deposited near accretion zones and may be a source of silica and other elements released during diagenesis |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_816349 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Physical properties and geochemistry at DSDP Leg 70 Holes Schmincke, Hans-Ulrich 70-506D; 70-507D; 70-507F; 70-509; 70-510; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg70; North Pacific/MOUND; North Pacific Ocean Ashes occurring both as distinct layers and mixed with pelagic sediments of the hydrothermal mounds lying south of the Galapagos Rift are mainly rhyolitic and basaltic. The ashes, of rhyolitic to intermediate composition, appear to belong to a calc-alkalic series and were probably derived from Plinian eruptions in Ecuador or Colombia. Basaltic ashes are made of nonvesicular sideromelane spalling shards and are of tholeiitic composition. They probably were derived locally from fault scarps. Most rhyolitic and basaltic glass shards studied are fresh except for hydration of the rhyolitic shards. Some shards are severely altered, however. Basaltic ash may be more common in pelagic sediments deposited near accretion zones and may be a source of silica and other elements released during diagenesis |
| title | Physical properties and geochemistry at DSDP Leg 70 Holes |
| topic | 70-506D; 70-507D; 70-507F; 70-509; 70-510; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg70; North Pacific/MOUND; North Pacific Ocean |
| url | https://doi.org/10.1594/PANGAEA.816349 |