Fleet A J McKelvey Barrie C 1978 Major and trace element analyses from DSDP Hole 26-253 at the Ninetyeast Ridge in the Indian Ocean dataset publication series https://doi.org/10.1594/PANGAEA.762177 Fleet A J McKelvey Barrie C 1978 Eocene explosive submarine volcanism, Ninetyeast Ridge, Indian Ocean journal article Marine Geology 26(1-2) https://doi.org/10.1016/0025-3227(78)90047-6 73-97 A basaltic sequence of Eocene submarine-erupted pyroclastic sediments totals at least 388 m at DSDP Site 253 on the Ninetyeast Ridge. These fossiliferous hyaloclastic sediments have been erupted and fragmented by explosive volcanism (hydroexplosions) in shallow water. The occurrence of interbedded basaltic ash-fall tuffs within the younger horizons of the hyaloclastic sequence marks the emergence of some Ninetyeast Ridge volcanic vents above sea level. Considerable textural variation allows subdivision of the sequence into six informal lithostratigraphic units. Hydrothermal and diagenetic alteration has caused the complete replacement of all original glass by smectites, and the introduction of abundant zeolite and calcite cements. The major and trace element contents of the hyaloclastites vary due to the alteration, and the admixture of biogenous calcite. On a calcium carbonate-free basis systematic variations are recognisable. Mg, Ni, Cr and Cu are enriched, and Li and Zn depleted in the three older units relative to the younger three. The chemical variability is reflected by the development of saponite in the older part of the sequence and montmorillonite in the younger; and by the presence of a quartz-normative basalt flow occurring in Unit II, in contrast to the Mg-rich highly olivine-normative basalt at the base of the sequence. The younger and older parts of the sequence therefore appear to have been derived from magmas of different chemistry. The sequence, like other basaltic rocks recovered from the Ninetyeast Ridge, is enriched in the light relative to the heavy rare earth elements (REE) although the REE contents vary unsystematically with depth, probably because of the high-temperature subaqueous alteration and the presence of biogenous calcite. This REE data indicates that the Ninetyeast Ridge volcanism was different from that which produces mid-ocean ridge basalts. 87.36619999999999 87.36619999999999 -24.8775 -24.8775 87.36619999999999 -24.8775 1972-10-01T00:00:00 1972-10-01T00:00:00 not specified DSDP Deep Sea Drilling Project https://www.deepseadrilling.org/ Deep Sea Drilling Project DSDP 26-253 -24.8775 87.3662 Indian Ocean//RIDGE -1962.0 1972-10-01T00:00:00 Leg26 Leg26 1972-09-06T00:00:00 1972-09-06 1972-10-30T00:00:00 1972-10-30 Glomar Challenger https://www-odp.tamu.edu:443/glomar.html Davies, Thomas A Davies, Thomas A doi:10.2973/dsdp.proc.26.1974 Glomar Challenger https://www-odp.tamu.edu:443/glomar.html Drilling/drill rig DRILL 559 m 269.5 m 52 cores; 479.5 m cored; 57 m drilled; 56.2 % recovery 4 CC-BY-3.0 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/ Sample code/label | Sample label | DSDP/ODP/IODP sample designation | Titanium | Ti | Aluminium | Al | Iron | Fe | Manganese | Mn | Magnesium | Mg | Calcium | Ca | Sodium | Na | Potassium | K | Calcium carbonate | CaCO3 | Lithologic unit/sequence | Unit | Lithium | Li | Strontium | Sr | Barium | Ba | Chromium | Cr | Cobalt | Co | Nickel | Ni | Copper | Cu | Zinc | Zn | Molybdenum | Mo supplement citable method5059 param18478 param24619 param5440 param673 param675 param70 param75 param76 param77 param78 param79 param790 param80 param81 param82 param83 param84 param85 param86 param87 param90 pi38530 author22670 author38530 basis12 campaign148 campaign3374872 event12349 geocode1599 geocode1600 geocode1601 geocode8128 inst41 journal10819 license101 method10974 project4 ref34554 term20741 topotype1