Correlation of widespread Holocene and Pleistocene tephra layers from Newberry Volcano, Oregon, USA, using glass compositions and numerical analysis
Correlation of widespread Holocene and Pleistocene tephra layers from Newberry Volcano, Oregon, USA, using glass compositions and numerical analysis
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使用玻璃成分和数值分析对美国俄勒冈州纽伯里火山广泛分布的全新世和更新世火山灰层进行关联
DOI：
10.1016/j.quaint.2005.11.008
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发表时间：
2006
影响因子：
2.2
通讯作者：
F. Foit
中科院分区：
文献类型：
--
作者：
Stephen Kuehn;F. Foit
在过去的大约50万年里，俄勒冈州的纽伯里火山至少产生了50个流纹岩和英安岩，从当地分布的浮石环和圆锥体到点火沸石，再到广泛分布的深成碎屑沉积。到目前为止，已经在美国西部五个州的20个地点发现了13个Tephra单位，年龄从152514C到&Gt；20万年。应用相似系数和判别函数分析，对电子探针分析测定的玻璃主要元素组成建立了关联式。纽伯里浮石与俄勒冈州和爱达荷州的四个地点相关。东湖或中央浮石锥形特弗拉与俄勒冈州的两个地点相关。波利纳溪、冰矿场、9912D、9920C、984F、984G5、9917C和9881C与俄勒冈州夏水湖的火山灰床相关。Paulina Creek Tephra还与加利福尼亚州北部的几个地点相关，相当于奥莱马火山灰床。Tephra 9917C与俄勒冈州普林格尔瀑布的Tephas K和D非常相似。熔岩通道或相关的火山灰与犹他州波纳维尔盆地的一个未命名的火山灰有关。
During the last ca. 500,000 years, Newberry Volcano in Oregon has produced at least 50 rhyolitic and dacitic tephras ranging from locally distributed pumice rings and cones to ignimbrites to widely dispersed plinian fallout deposits. To date, 13 tephra units with ages ranging from about 152514C years BP to >200,000 years BP have been traced to 20 sites across five western states of the USA. Correlations have been established by applying similarity coefficient and discriminant function analysis to major element compositions of tephra-derived glasses determined by electron microprobe analysis. Newberry Pumice correlates to four locations in Oregon and Idaho. East Lake or Central Pumice Cone tephra correlates to two locations in Oregon. Paulina Creek, Ice Quarry, 9912D, 9920C, 984F, 984G5, 9917C, and 9881C tephras correlate to ash beds at Summer Lake, Oregon. Paulina Creek tephra also correlates to several locations in northern California and is equivalent to the Olema ash bed. Tephra 9917C is very similar to tephras K and D at Pringle Falls, Oregon. Lava Pass or a related tephra correlates to an unnamed tephra in the Bonneville basin, Utah.