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| Detailed Reference Information |
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Saito, K. and Ozima, M. (1977). (super 40) Ar- (super 39) Ar geochronological studies on submarine rocks from the western Pacific area. Earth and Planetary Science Letters 33(3): 353-369. doi: 10.1016/0012-821X(77)90087-5. |
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(super 40) Ar- (super 39) Ar incremental heating dating has been applied to (1) one medium-grained hawaiite from the Suiko Seamount in the Emperor volcanic chain, (2) one alkali dolerite from a seamount in the Necker Rise, and (3) twelve rocks from the Line volcanic chain and its vicinity. (super 40) Ar- (super 39) Ar ages were calculated from isochron plots. Only those experimental data for which the F test suggested acceptable fits to a straight line at 95% confidence level were used for age interpretation. The age of the Suiko Seamount (58.1+0.6 m.y.) is in excellent agreement with a hot spot origin of the Emperor chain. The age for the Necker Rise sample (82.4+3.2 m.y.) suggests that the formation of this rise is a different event from the formation of the northern part of the Line volcanic chain. Ages for the Line chain samples are very complex, ranging from 55 to 127.5 m.y. There does not seem to be the simple age progression which should be expected if the whole Line volcanic chain is of a hot spot origin. |
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Keywords
absolute age; alkali basalts; Ar/Ar; basalts; chains; data; dates;, diabase; Emperor Seamounts; genesis; geochronology; hawaiite; hot, spots; igneous rocks; interpretation; islands; Line Islands;, magnetic anomalies; Mesozoic; North Pacific; Northwest Pacific;, ocean floors; Oceania; Pacific Ocean; plutonic rocks; Polynesia;, quiet zones; seamounts; Suiko Seamount; volcanic; volcanic rocks;, west; West Pacific, 03, Geochronology |
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Publisher
Elsevier Science
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