(Table 1) Mineralogical composition of sediments from DSDP Sites 69-504 and 69-505
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
1983
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| _version_ | 1867170961828085760 |
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| author | Beiersdorf, Helmut Rösch, Heinrich |
| author_facet | Beiersdorf, Helmut Rösch, Heinrich |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We discuss the provenance of minerals detected by X-ray-diffraction analyses of sediments of Sites 504 and 505 of Deep Sea Drilling Project Leg 69. These are X-ray-amorphous material, opal-CT, calcite, quartz, feldspar, apatite, smectite, illite, kaolinite, magnetite, maghemite, pyrite, marcasite, barite, sepiolite, and clinoptilolite. Authigenic marcasite and clinoptilolite together with opal-CT are restricted to Site 504, indicating the special diagenetic conditions related to relatively high sediment temperatures at this site. Marcasite formation is likely dependent on the relatively low pH values of <7.1 found in interstitial waters of Site 504 sediments below 50 meters sub-bottom. Clinoptilolite evidently was formed by diagenetic alteration of rhyolitic volcanic glass or smectite plus biogenic silica within the chalk-limestone-chert sequence of Site 504, where opal-CT also reflects a high degree of silica dissolution and reprecipitation. This was a consequence of high temperatures (50-55 °C) at the base of the sediment column. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_816252 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Mineralogical composition of sediments from DSDP Sites 69-504 and 69-505 Beiersdorf, Helmut Rösch, Heinrich 69-504; 69-504A; 69-504B; 69-505; Amorphics; Amphibole; Apatite; Barite; Calcium carbonate; Clinoptilolite; Deep Sea Drilling Project; Dolomite; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Feldspar; Glomar Challenger; Goethite; Illite; Kaolinite; Latitude of event; Leg69; Lithologic unit/sequence; Longitude of event; Maghemite; Magnetite; Marcasite; North Pacific/GRABEN; Opal-CT; Pyrite, FeS2; Quartz; Sample code/label; Sepiolite; Siderite; Size fraction < 0.002 mm, clay; Size fraction > 0.020 mm; Size fraction 0.020-0.002 mm; Smectite; Talc; Volumetry; X-ray diffraction (XRD) We discuss the provenance of minerals detected by X-ray-diffraction analyses of sediments of Sites 504 and 505 of Deep Sea Drilling Project Leg 69. These are X-ray-amorphous material, opal-CT, calcite, quartz, feldspar, apatite, smectite, illite, kaolinite, magnetite, maghemite, pyrite, marcasite, barite, sepiolite, and clinoptilolite. Authigenic marcasite and clinoptilolite together with opal-CT are restricted to Site 504, indicating the special diagenetic conditions related to relatively high sediment temperatures at this site. Marcasite formation is likely dependent on the relatively low pH values of <7.1 found in interstitial waters of Site 504 sediments below 50 meters sub-bottom. Clinoptilolite evidently was formed by diagenetic alteration of rhyolitic volcanic glass or smectite plus biogenic silica within the chalk-limestone-chert sequence of Site 504, where opal-CT also reflects a high degree of silica dissolution and reprecipitation. This was a consequence of high temperatures (50-55 °C) at the base of the sediment column. |
| title | (Table 1) Mineralogical composition of sediments from DSDP Sites 69-504 and 69-505 |
| topic | 69-504; 69-504A; 69-504B; 69-505; Amorphics; Amphibole; Apatite; Barite; Calcium carbonate; Clinoptilolite; Deep Sea Drilling Project; Dolomite; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Feldspar; Glomar Challenger; Goethite; Illite; Kaolinite; Latitude of event; Leg69; Lithologic unit/sequence; Longitude of event; Maghemite; Magnetite; Marcasite; North Pacific/GRABEN; Opal-CT; Pyrite, FeS2; Quartz; Sample code/label; Sepiolite; Siderite; Size fraction < 0.002 mm, clay; Size fraction > 0.020 mm; Size fraction 0.020-0.002 mm; Smectite; Talc; Volumetry; X-ray diffraction (XRD) |
| url | https://doi.org/10.1594/PANGAEA.816252 |