Age determination of the rhyolites of the Lord Howe Rise in the Southwest Pacific Ocean, supplement to: McDougall, Ian; van der Lingen, Gerrit J (1974): Age of the Rhyolites of the Lord Howe Rise and the evolution of the Southwest Pacific Ocean. Earth and Planetary Science Letters, 21(2), 117-126

Ian McDougall & Gerrit J van der Lingen
Drilling at site 207 (DSDP Leg 21), located on the broad summit of the Lord Howe Rise, bottomed in rhyolitic rocks. Sanidine concentrates from four samples of the rhyolite were dated by the 40Ar/39Ar total fusion method and conventional K-Ar method, and yielded concordant ages of 93.7 +/- 1.1 my, equivalent to the early part of the Upper Cretaceous. At this time the Lord Howe Rise, which has continental-type structure, is thought to have been...
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