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Petrology of Quaternary volcanics of the Broken Top and Diamond Peak areas, central and south-central Oregon High Cascades: Evidence for varied magmatic processes from two contrasting volcanic centers.

机译：俄勒冈中部和中南部高断层破碎山顶和钻石峰地区的第四纪火山岩岩石学：来自两个相反的火山中心的岩浆作用变化的证据。

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Quaternary volcanism in the Broken Top (BT) area of the central Oregon High Cascades ranges from basalt to rhyodacite. Most non-BT lavas were generated through low pressure crystal fractionation (CF) in small, short-lived shallow (ca. 2.5-3 km deep) chambers. Lavas erupted from BT are dominantly basaltic andesite (53.5-58 wt.% SiO;Andesitic volcanism (since 0.5 Ma) dominated the Diamond Peak Wilderness (DPW) area of the south-central Oregon High Cascades. Early stage basaltic andesites (0.5-0.1 Ma) erupted at Mt. Yoran (55.5-56.9 wt.% SiO;Significant differences between magmatic processes operating at BT and DPW are related to local structure and tectonics. Extension and the related graben structure in the BT area promoted development of shallow magma chambers where low pressure processes operated. Milder extension in the DPW area allowed significant underplating of basalt, leading to lower crustal melting and mixing. However, extension was significant enough that resulting magmas reached the surface without any significant low pressure overprint.

机译：俄勒冈州中部高瀑布的断顶（BT）区域的第四纪火山活动范围从玄武岩到流纹岩。大多数非BT熔岩是通过低压晶体分馏（CF）在小的，短寿命的浅层（约2.5-3 km深）室内产生的。从BT喷发的拉瓦斯主要是玄武质安山岩（53.5-58 wt。％SiO；安第斯山火山岩（自0.5 Ma起）主导了俄勒冈州中南部高瀑布的钻石峰荒野（DPW）地区。早期玄武质安山岩（0.5-0.1 Ma）在约兰山（55.5-56.9 wt。％SiO）喷发；在BT和DPW处发生的岩浆过程之间的显着差异与局部结构和构造有关；在BT区的扩展和相关的en陷结构促进了浅岩浆室的发展。 DPW区域的温和伸展使玄武岩明显下沉，从而降低了地壳的熔融和混合；但是，伸展程度足够大，以致产生的岩浆到达了地表而没有任何明显的低压套印。

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作者
Webster, John Robert.;
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作者单位

Indiana University.;

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授予单位 Indiana University.;
学科 Geology.;Geochemistry.
学位 Ph.D.
年度 1992
页码 431 p.
总页数 431
原文格式 PDF
正文语种 eng
中图分类地质学;地质学;
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Petrology of Quaternary volcanics of the Broken Top and Diamond Peak areas, central and south-central Oregon High Cascades: Evidence for varied magmatic processes from two contrasting volcanic centers.

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