Annotated record of the detailed examination of a ferromanganese crust retrieved the Emperor Seamount area in the Pacific Ocean by the R/V Kana Keoki during one of its KK76 expedition, supplement to: Dalrymple, G Brent; Garcia, M O (1980): Age and Chemistry of Volcanic Rocks Dredged from JingƄ Seamount, Emperor Seamount Chain. In: Jackson, E.D.; Koisumi, I.; et al., Initial Reports of the Deep Sea Drilling Project, U.S. Government Printing Office, LV, 685-693


40Ar/39Ar incremental heating experiments on three samples dredged from Jingu Seamount indicate that Jingu is 55.4 ± 0.9 m.y. old — older than the Hawaiian-Emperor bend and younger than the two dated Emperor Seamounts to the north. Major-oxide chemistry and petrography show that the samples are similar to hawaiites and mugearites from the Hawaiian Islands. By analogy with Hawaiian alkalic volcanic rocks, groundmass plagioclase compositions (An40-47) indicate that the three Jingu samples are probably mugearites. These results suggest that Jingu is a Hawaiian-type volcano and that the Emperor volcanoes become progressively older from south to north, as predicted by the hot-spot hypothesis.

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Metadata Access
Creator Dalrymple, G Brent; Garcia, M O
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1980
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 8 data points
Discipline Earth System Research
Spatial Coverage (171.040 LON, 38.621 LAT); Pacific Ocean