Mineralogy and geochemistry at DSDP Leg 64 Holes
| Cobertura |
MEDIAN LATITUDE: 27.215490 * MEDIAN LONGITUDE: -111.452780 * SOUTH-BOUND LATITUDE: 27.030000 * WEST-BOUND LONGITUDE: -111.624800 * NORTH-BOUND LATITUDE: 27.846000 * EAST-BOUND LONGITUDE: -111.398800 * DATE/TIME START: 1978-12-18T00:00:00 * DATE/TIME END: 1978-12-29T00:00:00 |
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| Data(s) |
04/09/1982
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| Resumo |
At DSDP Site 477, late Quaternary diatomaceous muds and delta-derived silty-sand turbidites at 2000 meters water depth have been extensively and progressively altered by a deep-seated heat source beneath a sill. Bulk petrologic and microprobe analyses have identified a crudely zoned paragenesis within 260 meters sub-bottom which ranges from unaltered to slightly altered oozes (0-50 m), anhydrite-dolomite claystones (105-125 m), illite-chlorite-pyrite claystones (125-140 m), chlorite-pyrite-calcite-carbonaceous claystones with traces of K-feldspar, albite, epidote (140-190 m), and chlorite-epidote-quartz-albite-pyrrhotite-sphene sandstone (190-260 m). Several petrologic features suggest rapid processes of ocean floor metamorphism: (1) friable and porous textures, (2) abundant relict grains with overgrowths, (3) idiomorphic habits on epidotes, feldspars, and quartz, and (4) a steep gradient in levels of alteration. Many aspects of this hydrothermal assemblage are similar to hydrothermally metamorphosed sandstones of the Cerro Prieto, Mexico, geothermal area. |
| Formato |
application/zip, 2 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.819067 doi:10.1594/PANGAEA.819067 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Kelts, Kerry (1982): Petrology of hydrothermally metamorphosed sediments at Deep Sea Drilling Site 477, southern Guaymas Basin Rift, Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 1123-1136, doi:10.2973/dsdp.proc.64.152.1982 |
| Palavras-Chave | ## = 61% Fe = 79% FeO; # = Bence/Albee corrected; 64-477; 64-477A; 64-478; 64-479; Å; Å; #0 = broad minor; #12.5= 12.5-15 Å broad; Å; #1; Å; #2; Å; Other; Al2O3; Aluminium oxide; Anh peak height; Anhydrite (peak height); CaCO3 peak height; Calcium carbonate (peak height); Calcium oxide; CaO; Chlorite (peak height); Chl peak height; Clay (peak height); Clay peak height; Clinoptilolite (peak height); Comment; Cpt peak height; Deep Sea Drilling Project; Depth; DEPTH, sediment/rock; Description; Dolomite (peak height); Dol peak height; DRILL; Drilling/drill rig; DSDP; Electron microprobe; Epidote (peak height); Ep peak height; Event; Fe; FeO; Glomar Challenger; Gp peak height; Gypsum (peak height); Height; Illite (peak height); Ill peak height; Iron; Iron oxide, FeO; K2O; Kalifeldspar (peak height); Kfs peak height; Label; Leg64; Lithology; Lithology/composition/facies; Magnesium oxide; Manganese oxide; mbsf; MgO; mm; mm; # = stoichlometric; mm; #1; mm; #42 = asymmetry; mm; <1 = trace; mm; <1 = trace?; mm; Other; MnO; Na2O; North Pacific/Gulf of California/BASIN; North Pacific/Gulf of California/CHANNEL; ODP sample designation; Opal (peak height); Opal peak height; Peak height; New; Peak height; Other; Plagioclase (peak height); Plagioclase (peak height), mm; #1; Pl peak height; Po peak height; Potassium oxide; Py peak height; Pyrite (peak height); Pyrrhotite (peak height); Quartz, mm; Quartz (peak height); Qz peak height; S; Sample code/label; Silicon dioxide; SiO2; Sodium oxide; Sulfur, total; TiO2; Titanium oxide; Total; X-ray diffraction (XRD); Zeolite (peak height); Zeo peak height |
| Tipo |
Dataset |
