Publication Date:
2023-07-07
Description:
This chapter was previously intended to trace volcanic episodes through the Neogene and Pleistocene geological history recorded in the sedimentary sections drilled on the Emperor seamounts. Drilling disturbance, poor core recovery, and incomplete stratigraphic sections recovered from the seamounts have frustrated that plan, however. Moreover, the Leg 55 sedimentologists found in their smear-slide studies that transported island-arc tephra is scarce in the sediments, if present at all. So we have restricted our objective to description of the volcaniclastic admixture in sediments, as determined by mineralogical and geochemical data. We studied geochemistry of bulk samples (see Murdmaa et al., 1980), coarse-fraction mineralogy, and additional smear slides. The results obtained, however, do not tell much more about the volcaniclastic matter than did shipboard core descriptions.
Keywords:
55-430; 55-432; 55-433A; 55-433B; Apatite; Barite; Carbonates; Clinopyroxene; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Epidote; Event label; Feldspar; Garnet; Glomar Challenger; Heavy minerals; Hornblende; Iron oxide; Latitude of event; Leg55; Light minerals; Longitude of event; North Pacific/SEAMOUNT; North Pacific/SEDIMENT POND; North Pacific/TERRACE; Opal, biogenic silica; Opaque minerals; Orthopyroxene; Plagioclase; Pyrite, FeS2; Quartz; Sample code/label; Smear slide analysis; Sphene; Volcanic glass; Zeolite; Zircon
Type:
Dataset
Format:
text/tab-separated-values, 286 data points
