A Complex Magma Mixing Origin for Rocks Erupted in 1915, Lassen Peak, California
نویسندگان
چکیده
منابع مشابه
Magma Composition and Igneous Rocks
Introduction In the following chapters we will find that nearly all of the varied aspects of volcanism are either directly or indirectly controlled by the chemical composition of magma and the rate at which it cools and solidifies. If you are to understand and appreciate subsequent discussions of volcanoes and related volcanic phenomena, it is essential that you have a good grasp of the basic c...
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The steep crest of the Sierra Nevada, Califor-nia, near Onion Valley, exposes natural cross sections through a mafic intrusive complex that formed as part of the Mesozoic Sierra Nevada batholith. Sheeted sills of hornblende gabbro to hornblende diorite, individually as thick as 1.5 m, form the upper 200 to 300 m of the complex. Thicker, multiply-injected sills, as well as mafic stocks, lie unde...
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Odontomas are the commonest hamartomas as well as odontogenic tumor. They are a malformation in which dental tissues are represented in more or less disorderly pattern. They prevent the eruption of the teeth and mostly asymptomatic in nature. Usually they are discovered on routine radiographic examination. The odontomas which erupt in oral cavity are called as erupted odontomas and are rare in ...
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Petrology and geochemical characteristics of granitic rocks from South Sulawesi, especially from Polewaliand Masamba area are presented in order to elucidate their origin of magma and geodynamic setting. The granitic rocks in these areas are dominated by granodiorite and granite in composition. Quartz, K-feldspar and plagioclase occur as major phases with hornblende and biotite as major ferroma...
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ژورنال
عنوان ژورنال: Journal of Petrology
سال: 1999
ISSN: 0022-3530,1460-2415
DOI: 10.1093/petroj/40.1.105