Proc. IODP, 347, Site M0066

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Chapter contents Introduction Operations Transit to Hole M0066A Hole M0066A Hole M0066B Lithostratigraphy Unit I Unit II Unit III Unit IV Biostratigraphy Diatoms Foraminifers and ostracods Palynological results Geochemistry Interstitial water Sediment Physical properties Natural gamma radiation Shipboard magnetic susceptibility and noncontact resistivity Density Paleomagnetism Discrete sample measurements Magnetic susceptibility Natural remanent magnetization and its stability Paleomagnetic directions Stratigraphic correlation Seismic units Reference Figures F1. Graphic lithology log. F2. Color changes between Subunits Ia and Ib. F3. Chloride, salinity, and alkalinity. F4. Sulfate, ammonium, phosphate, iron, manganese, and pH. F5. Bromide, boron, and chloride. F6. Sodium, potassium, magnesium, calcium, and chloride. F7. Dissolved silica, lithium, barium, and strontium. F8. TC, TOC, TIC, and TS. F9. NGR, MS, NCR, and dry density. F10. Gamma and discrete bulk density. F11. MS and NRM. F12. NRM. F13. Magnetic susceptibility. F14. Seismic profile and lithostratigraphic boundaries. Tables T1. Operations. T2. Interstitial water geochemistry. T3. Salinity and elemental ratios. T4. TC, TOC, TIC, and TS. T5. Composite depth scale. T6. Splice tie points. T7. Sound velocity data. PDF file			Previous \| Next doi:10.2204/iodp.proc.347.110.2015 Biostratigraphy Diatoms Section tops from Hole M0066A were analyzed for siliceous microfossils. No siliceous microfossils were found in any of the samples analyzed. Foraminifers and ostracods A total of 30 samples (17 core catchers and 13 Onshore Science Party [OSP] samples) from Site M0066 were prepared for foraminiferal and ostracod analysis. Quaternary foraminifers and ostracods do not occur in the sediments sampled from this site, although some redeposited pre-Quaternary foraminifers and ostracods are present in the lower diamicton and sand units. Unlike nearby Site M0065, this site does not contain an organic-rich clay unit at the surface (which may have represented the brackish period at Site M0065). The lack of this organic-rich clay deposit and the lack of Quaternary foraminifers and ostracods suggests that the brackish unit was not recovered here, perhaps because of open holing in the upper ~2 m. Almost no microfossils >63 µm are present, even in the upper gray-brown clay (Unit 1), suggesting that this deposit may represent a low-productivity freshwater environment (see “Lithostratigraphy”). Palynological results Palynological analyses for this site focused on Hole M0066A. Two samples from Hole M0066A (core catcher samples from Cores 347-M006A-2H and 11H) were analyzed in total. As expected from the sedimentologic data, the samples were virtually barren of palynomorphs, probably because of oxidation of the organic material. Therefore, no palynological data could be generated for this site. Top of page \| Previous \| Next