Snow Peak, Oregon: Latest Miocene low-K tholeiite volcanism in the Cascadia forearc
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- 作者：A.K. Hatfielda ; R.L. Nielsena ; A.J.R. Kenta ; adam.kent@geo.oregonstate.edu" class="auth_mail" title="E-mail the corresponding author ; M.C. Rowea ; b ; R.A. Duncana
- 关键词：Snow Peak ; Cascade arc ; Low-K tholeiite ; 40Ar&ndash ; 39Ar dating
- 刊名：Lithos
- 出版年：2015
- 出版时间：15 December 2015
- 年：2015
- 卷：239
- 期：Complete
- 页码：86-96
- 全文大小：1423 K
文摘
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We present new data on the chemical composition of Snow Peak, a moderate size shield volcano in the Cascade forearc.
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We revise the age of volcanism from ~ 3 Ma based on older K-Ar ages to between 5.3-6 Ma.
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Snow Peak is part of a suite of lavas with low-K tholeiite affinities erupted at this time in the central Oregon Cascades.
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Volcanism is likely associated with on-arc extension, and occurred over a distance of ~ 120 km across the arc.