Mineralogy of silts from the Bengal Fan
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| Autori principali: | , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1990
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| _version_ | 1867169502876139520 |
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| author | Yokoyama, Kazumi Amano, Kazuo Taira, Asahiko Saito, Yasuji |
| author_facet | Yokoyama, Kazumi Amano, Kazuo Taira, Asahiko Saito, Yasuji |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Early Miocene to Quaternary sediments drilled from the Bengal Fan are divided into six zones by modal proportions of heavy minerals. The sediments were mostly derived from the Himalayas. Detritus from the Indian subcontinent is found sporadically in clay-rich sediments that were deposited during periods of slow sedimentation, when the deep-sea channel migrated away from the drilled sites. The oldest sediments, ranging from 17 to about 15 Ma, were derived mostly from the Precambrian and Paleozoic sedimentary rocks of the lower Himalayas. At about 15 Ma, metamorphic terrains were eroded in the source area. Further large-scale unroofing of metamorphic rocks occurred around 11 Ma. After 10 Ma, the major constituents in the drainage basin or the drainage pattern changed a few times. Between 3.5 and 0.5 Ma, a large peridotite body was unroofed by uplift and successive erosion of the central Himalayas. At this time, the single large river that had supplied detritus to the early Bengal Fan was divided into the Indus and Ganges rivers. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_756630 |
| institution | PANGAEA |
| language | en |
| publishDate | 1990 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Mineralogy of silts from the Bengal Fan Yokoyama, Kazumi Amano, Kazuo Taira, Asahiko Saito, Yasuji 116-717A; 116-717C; 116-718C; 116-719A; DRILL; Drilling/drill rig; Joides Resolution; Leg116; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean Early Miocene to Quaternary sediments drilled from the Bengal Fan are divided into six zones by modal proportions of heavy minerals. The sediments were mostly derived from the Himalayas. Detritus from the Indian subcontinent is found sporadically in clay-rich sediments that were deposited during periods of slow sedimentation, when the deep-sea channel migrated away from the drilled sites. The oldest sediments, ranging from 17 to about 15 Ma, were derived mostly from the Precambrian and Paleozoic sedimentary rocks of the lower Himalayas. At about 15 Ma, metamorphic terrains were eroded in the source area. Further large-scale unroofing of metamorphic rocks occurred around 11 Ma. After 10 Ma, the major constituents in the drainage basin or the drainage pattern changed a few times. Between 3.5 and 0.5 Ma, a large peridotite body was unroofed by uplift and successive erosion of the central Himalayas. At this time, the single large river that had supplied detritus to the early Bengal Fan was divided into the Indus and Ganges rivers. |
| title | Mineralogy of silts from the Bengal Fan |
| topic | 116-717A; 116-717C; 116-718C; 116-719A; DRILL; Drilling/drill rig; Joides Resolution; Leg116; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean |
| url | https://doi.org/10.1594/PANGAEA.756630 |