Publication Date:
2023-08-28
Description:
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.
Keywords:
Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; Dredge; DRG; DSDP; Identification; Kana Keoki; KK760806; KK760806-01,KK760806-02,KK76; KK760806-2 STA24 RD10; KK760806-RD10; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Pacific Ocean; Position; Quantity of deposit; Sediment type; Size; Substrate type; Visual description
Type:
Dataset
Format:
text/tab-separated-values, 8 data points
