Mineral composition and geochemistry of sediments from ODP Leg 127 sites
Fuente:
PANGAEA
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Format: | Dataset Open Access |
| Sprache: | en |
| Veröffentlicht: |
PANGAEA
1992
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1867167667334414336 |
|---|---|
| author | Tada, Ryuji Iijima, Azuma |
| author_facet | Tada, Ryuji Iijima, Azuma |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The lithostratigraphy of Neogene hemipelagic sediments recovered from the Japan Sea during Leg 127 was revised to improve intersite consistency and to remove confusion stemming from diagenetic modification of the lithology through the opal-A to opal-CT transformation. Special emphasis was put on the presence and nature of dark-light cycles in revising the lithostratigraphy. Mineral composition analysis was conducted for samples from Sites 794, 795, and 797. In addition, major element chemical composition analysis was conducted for these same sample sets from Site 794. The result of mineral composition analysis suggests that the detrital component, which consists of such minerals as quartz, plagioclase, illite, and kaolinite plus chlorite, is diluted to various degrees by biogenic silica (opal-A) and its diagenetic equivalents (opal-CT and quartz). Smectite, on the other hand, may be a diagenetic or hydrothermal alteration product of volcanic material, although more study is necessary to confirm its origin. As a whole, vertical variation in the sediment composition is consistent with the revised lithostratigraphy and helps to characterize the redefined lithologic units quantitatively. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_778151 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Mineral composition and geochemistry of sediments from ODP Leg 127 sites Tada, Ryuji Iijima, Azuma 127-794A; 127-794B; 127-794C; 127-795A; 127-795B; 127-797B; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg127; Ocean Drilling Program; ODP The lithostratigraphy of Neogene hemipelagic sediments recovered from the Japan Sea during Leg 127 was revised to improve intersite consistency and to remove confusion stemming from diagenetic modification of the lithology through the opal-A to opal-CT transformation. Special emphasis was put on the presence and nature of dark-light cycles in revising the lithostratigraphy. Mineral composition analysis was conducted for samples from Sites 794, 795, and 797. In addition, major element chemical composition analysis was conducted for these same sample sets from Site 794. The result of mineral composition analysis suggests that the detrital component, which consists of such minerals as quartz, plagioclase, illite, and kaolinite plus chlorite, is diluted to various degrees by biogenic silica (opal-A) and its diagenetic equivalents (opal-CT and quartz). Smectite, on the other hand, may be a diagenetic or hydrothermal alteration product of volcanic material, although more study is necessary to confirm its origin. As a whole, vertical variation in the sediment composition is consistent with the revised lithostratigraphy and helps to characterize the redefined lithologic units quantitatively. |
| title | Mineral composition and geochemistry of sediments from ODP Leg 127 sites |
| topic | 127-794A; 127-794B; 127-794C; 127-795A; 127-795B; 127-797B; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg127; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.778151 |