Unknown
PANGAEA
In:
Supplement to: Hekinian, Roger; Rosendahl, Bruce R; Natland, James H (1980): Ocean Crust Geothermal Processes: A Perspective from the Vantage of Leg 54 Drilling. In: Rosendahl, B.R.; Hekinian, R.; et al., Initial Reports of the Deep Sea Drilling Project, U.S. Government Printing Office, VIV, 267-294, https://doi.org/10.2973/dsdp.proc.54.115.1980
Publication Date:
2023-08-28
Description:
Two distinct sedimentary facies produced by sea-floor hydrothermal activity were cored during Deep Sea Drilling Project Leg 54. The first is equivalent to the typical basal iron- and manganese-rich, clayey mud recovered at many DSDP sites. It was sampled as a dispersed component throughout the cores taken in small sediment ponds in several sites within 120 km of the East Pacific Rise at 9°N. We infer that this component was originally deposited as iron hydroxides dispersed from high-temperature vents over the axial magma chamber of the East Pacific Rise. In the sediments, the iron hydroxides have reacted diagenetically with siliceous microfossil tests and detrital clays to form K- and Fe-rich clays with variable SiO2/Fe2O3 and Fe2O3/Al2O3, ratios.
Keywords:
54-419; 54-420; 54-421; 54-424; 54-424A; 54-424B; 54-424C; 54-425; 54-427; 54-428; 54-428A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg54; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; North Pacific/CONT RISE; North Pacific/MOUND; North Pacific/RIDGE; North Pacific/SEDIMENT POND; North Pacific/TROUGH
Type:
Dataset
Format:
application/zip, 2 datasets
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