Summary
Expedition 401 Mediterranean-Atlantic Gateway Exchange began in Amsterdam, Netherlands on December 12th and ended in Naples, Italy on February 9th. We drilled a total of 4 sites for the extent of the expedition recovering sediment. The samples processed in the x-ray lab where as follows:
- XRD samples were taken to be analyzed as bulk samples.
- XRD samples were taken to be analyzed as clay samples, which were then run as three separate analysis:
- Clay samples, no treatment involved
- Clay samples, glycolated for 12 hours
Sample Totals
Site | XRD |
|---|---|
| U1611 | |
| U1610 | 128 |
| U1609 | 104 |
| U1385 | 40 |
| Total |
Clay separation procedure for XRD in expedition 401
- Add sample in 50 ml centrifuge tube
- Add 45ml of water, I added DI water but it can be regular water as well (as mentioned by scientist)
- Sonify samples until the sample are all desegregated
- If samples, flocculate, then add sodium hexametaphosphate about a small tablespoon
- Leave for 4 12 hours, calculate time by measuring height of sample (Stoke's law)
- Empty suspended liquid in another centrifuge tube
- Then centrifuge 3000 rpm for 60 min
- Mount clay and measure, then glycolate for 12 hrs. and measure
...
- Bulk (~2hr scan)
- random mount
- 4°-70°
- Step: 0.02°
- Scanning speed: 2s/step
- Clay (~1hr scan)
- oriented mount
- 4°-40°
- Step: 0.02°
- Scanning speed: 2s/step
Issues
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