Annotated record of the detailed examination of Mn deposits observed from bottom photography taken during the INDOMED-1 expedition
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| Autori principali: | , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1979
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| _version_ | 1867170073567821824 |
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| author | Lonsdale, Peter Spiess, Fred N |
| author_facet | Lonsdale, Peter Spiess, Fred N |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 35 km either side of the Pacific-Cocos spreading axis at 846'N, on crust 0.6 x 10SUP-6 years old, a pair of small seamounts rises 1.4 km above the faulted terrain of young abyssal hills. A high-resolution traverse made with the sonars and cameras of a deeply towed vehicle shows that the seamounts are inactive volcanoes, with concave side slopes that steepen upwards to 30, and then abruptly flatten at 2-4 km wide summits. Ledges of pillow basalt outcrop on the lower slopes, and form some talus slopes, but the superficial rock of the upper slopes appear to be mainly hyaloclastite. A transponder-navigated deep-tow survey at the summit area of the eastern seamount mapped an asymmetric caldera containing 3 pit craters, which have vertical walls and flat floors. Dredging across the caldera floor recovered hyaloclastite, angular fragments of primitive tholeiite, and manganese nodules. The paired seamounts probably had a common origin at a 'hot spot' on the spreading axis; continued to grow after they were split by sea-floor spreading; and became extinct and suffered summit collapse after they spread too far from their magma source. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_873178 |
| institution | PANGAEA |
| language | en |
| publishDate | 1979 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Annotated record of the detailed examination of Mn deposits observed from bottom photography taken during the INDOMED-1 expedition Lonsdale, Peter Spiess, Fred N Comment; Deposit type; DEPTH, sediment/rock; Description; East Pacific Ocean; File name; Identification; Indomed_leg_1; INMD-1-4C; Melville; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Photo/Video; Position; PV; Quantity of deposit; Sediment type; Size; Substrate type; Uniform resource locator/link to image; Visual description 35 km either side of the Pacific-Cocos spreading axis at 846'N, on crust 0.6 x 10SUP-6 years old, a pair of small seamounts rises 1.4 km above the faulted terrain of young abyssal hills. A high-resolution traverse made with the sonars and cameras of a deeply towed vehicle shows that the seamounts are inactive volcanoes, with concave side slopes that steepen upwards to 30, and then abruptly flatten at 2-4 km wide summits. Ledges of pillow basalt outcrop on the lower slopes, and form some talus slopes, but the superficial rock of the upper slopes appear to be mainly hyaloclastite. A transponder-navigated deep-tow survey at the summit area of the eastern seamount mapped an asymmetric caldera containing 3 pit craters, which have vertical walls and flat floors. Dredging across the caldera floor recovered hyaloclastite, angular fragments of primitive tholeiite, and manganese nodules. The paired seamounts probably had a common origin at a 'hot spot' on the spreading axis; continued to grow after they were split by sea-floor spreading; and became extinct and suffered summit collapse after they spread too far from their magma source. |
| title | Annotated record of the detailed examination of Mn deposits observed from bottom photography taken during the INDOMED-1 expedition |
| topic | Comment; Deposit type; DEPTH, sediment/rock; Description; East Pacific Ocean; File name; Identification; Indomed_leg_1; INMD-1-4C; Melville; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Photo/Video; Position; PV; Quantity of deposit; Sediment type; Size; Substrate type; Uniform resource locator/link to image; Visual description |
| url | https://doi.org/10.1594/PANGAEA.873178 |