Geochemistry of minerals at DSDP Holes 68-501 and 69-504B
| Cobertura |
MEDIAN LATITUDE: 1.227200 * MEDIAN LONGITUDE: -83.730917 * SOUTH-BOUND LATITUDE: 1.227200 * WEST-BOUND LONGITUDE: -83.734300 * NORTH-BOUND LATITUDE: 1.227200 * EAST-BOUND LONGITUDE: -83.730200 * DATE/TIME START: 1979-07-08T00:00:00 * DATE/TIME END: 1979-10-07T00:00:00 |
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| Data(s) |
05/07/1983
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| Resumo |
The interaction of seawater with basalts in DSDP Hole 501 and the upper part of Hole 504B (Costa Rica Rift) produced oxidative alteration and a zonation of clay minerals along cracks. From rock edges to interiors in many cracks the following succession occurs, based on microscopic observations and microprobe analysis: iron hydroxides (red), "protoceladonite" (green), iddingsite (orange), and saponite (yellow). Clay minerals replace olivines and fill vesicles and cracks. Other secondary minerals are phillipsite, aragonite, and unidentified carbonates. Some glass is transformed to Mg-rich palagonite. Bulk rock chemistry is related to the composition of the secondary minerals. The zonation can be interpreted as a succession of postburial nonoxidative and oxidative diagenesis similar to that described in the Leg 34 basalts. |
| Formato |
application/zip, 8 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.816415 doi:10.1594/PANGAEA.816415 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Noack, Y; Emmermann, Rolf; Hubberten, Hans-Wolfgang (1983): Alteration in Site 501 (Leg 68) and Site 504 (Leg 69) basalts: preliminary results. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 497-508, doi:10.2973/dsdp.proc.69.125.1983 |
| Palavras-Chave | #(001); (060); (110); (200); +; 68-501; 69-504B; Al; Al2O3; Aluminium; Aluminium oxide; Ca; Calcium; Calcium oxide; Calculated based on oxygen number; CaO; Cat; Cations; Color desc; Color description; d; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; d-spacing; Electron microprobe; Event; Fe; Fe2O3; FeO; Glomar Challenger; H2O; Iron 2+ and 3+; Iron oxide, Fe2O3; Iron oxide, FeO; K; K2O; Label; Leg68; Leg69; Magnesium; Magnesium oxide; Manganese; Manganese oxide; Mg; MgO; Minerals; Mn; MnO; Na; Na2O; North Pacific/FLANK; ODP sample designation; Oxidation coefficient = (Fe2O3/80)/(Fe2O3/80 + FeO/72); P2O5; Phosphorus oxide; Potassium; Potassium oxide; Ratio; Sample code/label; see reference(s); Si; Si/Al; Silicon; Silicon/Aluminium ratio; Silicon dioxide; SiO2; Sodium; Sodium oxide; Sr; Strontium; Sum; Sum of octahedral cation; Sum of octahedral cations; Ti; TiO2; Titanium; Titanium oxide; Total; Water in rock; X-ray diffraction; Zone type |
| Tipo |
Dataset |
