| _version_ | 1867170960756441088 |
|---|---|
| author | Hart, Stanley R Staudigel, Hubert |
| author_facet | Hart, Stanley R Staudigel, Hubert |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A well-constrained Rb/Sr isochron of secondary celadonites and carbonate from DSDP Hole 516F yields an age of 70.1 ± 1.6 Ma. This age is younger than the age of crust formation (about 82 Ma) and may provide evidence for a shortlived hydrothermal event on the Rio Grande Rise caused by a phase of off-ridge volcanism. The initial 87Sr/86Sr ratios of the celandonites and carbonate are lower than the contemporaneous seawater and indicate that the dissolved load of the hydrous solutions contains approximately 2% of basaltic component. K, Rb, and Cs contents in Hole 516F celadonites are similar to corresponding phases from DSDP Hole 417A, indicating that the upper crust at this site may represent a significant sink for seawater alkalies. The alkali ratios K/Rb and K/Cs of Hole 516F celadonites are also similar to the ratios in celadonites from 108-Ma-old crust at DSDP Holes 417 and 418. This correspondence shows that the K/Rb and K/Cs ratios in seawater remained essentially constant during the Cretaceous, from 108 to 70 Ma. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_811426 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) K, Rb, Cs, Sr, and 87Sr/86Sr in vein materials from DSDP Hole 72-516F Hart, Stanley R Staudigel, Hubert 72-516F; Caesium; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Identification; Leg72; Piece; Potassium; Rubidium; Sample code/label; see reference(s); South Atlantic/CONT RISE; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error A well-constrained Rb/Sr isochron of secondary celadonites and carbonate from DSDP Hole 516F yields an age of 70.1 ± 1.6 Ma. This age is younger than the age of crust formation (about 82 Ma) and may provide evidence for a shortlived hydrothermal event on the Rio Grande Rise caused by a phase of off-ridge volcanism. The initial 87Sr/86Sr ratios of the celandonites and carbonate are lower than the contemporaneous seawater and indicate that the dissolved load of the hydrous solutions contains approximately 2% of basaltic component. K, Rb, and Cs contents in Hole 516F celadonites are similar to corresponding phases from DSDP Hole 417A, indicating that the upper crust at this site may represent a significant sink for seawater alkalies. The alkali ratios K/Rb and K/Cs of Hole 516F celadonites are also similar to the ratios in celadonites from 108-Ma-old crust at DSDP Holes 417 and 418. This correspondence shows that the K/Rb and K/Cs ratios in seawater remained essentially constant during the Cretaceous, from 108 to 70 Ma. |
| title | (Table 1) K, Rb, Cs, Sr, and 87Sr/86Sr in vein materials from DSDP Hole 72-516F |
| topic | 72-516F; Caesium; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Identification; Leg72; Piece; Potassium; Rubidium; Sample code/label; see reference(s); South Atlantic/CONT RISE; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error |
| url | https://doi.org/10.1594/PANGAEA.811426 |