Ge/Si ratios in marine siliceous microfossils
Fuente:
PANGAEA
Gespeichert in:
| Hauptverfasser: | , , , |
|---|---|
| Format: | Dataset Open Access |
| Sprache: | en |
| Veröffentlicht: |
PANGAEA
1988
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1867170459345223680 |
|---|---|
| author | Shemesh, Aldo Mortlock, Richard A Smith, R J Froelich, Philip N |
| author_facet | Shemesh, Aldo Mortlock, Richard A Smith, R J Froelich, Philip N |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A procedure is presented to separate diatoms and radiolaria from marine sediments and from each other, to purify them of elements associated with other phases, and to dissolve them to determine their elemental composition. The cleaning procedure eliminates artifacts due to the presence of detrital clays and the high sorption capacity of hydrated silica. The concentration of trace elements (Al, Fe, Mg, and Ba) that we find in alkaline dissolutions of clean diatoms are at least an order of magnitude lower than previously reported. The overall long-term precision in the determination of Ge/Si in a sub-standard of clean diatoms is ±0.024 * 10**-6 (1 sigma). Ge/Si measured in diatoms and radiolaria from core tops indicates that high-latitude Holocene diatoms accurately record the present-day oceanic Ge/Si, while radiolarian ratios are systematically lower and display more scatter. Evaluation of Ge/Si in diatoms and radiolaria from Hole DSDP 265 (Plio-Pleistocene) suggests that post-depositional alteration of the ratio does not occur at this site, but the average ratio carried by diatoms over this time interval was lower than that in the present ocean. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_756978 |
| institution | PANGAEA |
| language | en |
| publishDate | 1988 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Ge/Si ratios in marine siliceous microfossils Shemesh, Aldo Mortlock, Richard A Smith, R J Froelich, Philip N 28-265; Antarctic Ocean/RIDGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; ELT17; ELT17.009-PC; ELT49; ELT49.007-PC; ELT50; ELT50.013-PC; Eltanin; Glomar Challenger; Leg28; PC; Piston corer; RC13; RC13-256; RC14; RC14-121; Robert Conrad; V21; V21-156; Vema A procedure is presented to separate diatoms and radiolaria from marine sediments and from each other, to purify them of elements associated with other phases, and to dissolve them to determine their elemental composition. The cleaning procedure eliminates artifacts due to the presence of detrital clays and the high sorption capacity of hydrated silica. The concentration of trace elements (Al, Fe, Mg, and Ba) that we find in alkaline dissolutions of clean diatoms are at least an order of magnitude lower than previously reported. The overall long-term precision in the determination of Ge/Si in a sub-standard of clean diatoms is ±0.024 * 10**-6 (1 sigma). Ge/Si measured in diatoms and radiolaria from core tops indicates that high-latitude Holocene diatoms accurately record the present-day oceanic Ge/Si, while radiolarian ratios are systematically lower and display more scatter. Evaluation of Ge/Si in diatoms and radiolaria from Hole DSDP 265 (Plio-Pleistocene) suggests that post-depositional alteration of the ratio does not occur at this site, but the average ratio carried by diatoms over this time interval was lower than that in the present ocean. |
| title | Ge/Si ratios in marine siliceous microfossils |
| topic | 28-265; Antarctic Ocean/RIDGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; ELT17; ELT17.009-PC; ELT49; ELT49.007-PC; ELT50; ELT50.013-PC; Eltanin; Glomar Challenger; Leg28; PC; Piston corer; RC13; RC13-256; RC14; RC14-121; Robert Conrad; V21; V21-156; Vema |
| url | https://doi.org/10.1594/PANGAEA.756978 |