Karpoff, Anne Marie (1980): The claystone layer between two basalt flows in Hole 432A; an argument for the emergence of Nintoku Seamount. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Shambach, James (editor), Jackson, Everett Dale, Koizumi, Itaru, Avdeiko, Gennady, Butt, Arif, Clague, David, Dalrymple, G. Brent, Greene, H. Gary, Karpoff, Anne Marie, Kirkpatrick, R. James, Kono, Masaru, Hsin Yi Ling, McKenzie, Judith, Morgan, Jason, Takayama, Toshiaki, Initial reports of the Deep Sea Drilling Project covering Leg 55 of the cruises of the drilling vessel Glomar Challenger, Honolulu, Hawaii to Yokohama, Japan; July-September 1977, 55, 707-711, georefid:1981-027026

The red claystone interlayered between basalt flows of Hole 432A is a subaerial formation. From its structure and mineralogical and geochemical composition, it is concluded that the claystone was formed by weathering of a basaltic tuffaceous ash under subtropical conditions and afterwards underwent a low-thermal transformation when the upper basalt flow settled. This agrees with the hypothesis that the Emperor seamounts, and in particular the Nintoku Seamount, were emergent during the period of their formation and of successive deposition of basalt flows.
West: 160.0000 East: 175.0000 North: 50.0000 South: 35.0000
Expedition: 55
Site: 55-432
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Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/dsdp.proc.55.132.1980 (c.f. for more detailed metadata)
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