Orthopyroxene and compositional layering in the Sugashima Ultramafic Mass, Mikabu belt

Tomoyuki MIZUKAMI

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Orthopyroxene and compositional layering in the Sugashima Ultramafic Mass, Mikabu belt

机译：Orthopyroxene and compositional layering in the Sugashima Ultramafic Mass, Mikabu belt

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摘要

The Sugashima ultramafic mass is one of the largest ultramafic bodies in the Mikabu belt, and is composed of a hornblende-poor part (Unit I) and a hornblende- rich part (Unit II). Unit I is a layered complex with laminar and convoluted structures probably formed as a crystal mush.Detailed petrographic studies reveal that orthopyroxene exists in almost all the rock types forming the igneous layering of Unit I: dunite, plagioclase wehrlite and olivine gabbro. Orthopyroxene crystals commonly occur adjacent to olivine crystals and locally show poikilitic textures enclosing olivine grains with rounded or irregular shapes, indicating their peritectic growth from a basaltic magma at a pressure lower than 0.9 GPa.

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来源
《岩石鉱物科学》 |2002年第2期|87-96|共10页
作者
Tomoyuki MIZUKAMI;
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作者单位

Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan;

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正文语种日语
中图分类岩石学;
关键词
Orthopyroxene; Sugashima ultramafic mass; Mikabu belt; Poikilitic texture; Igneous structure;

Orthopyroxene and compositional layering in the Sugashima Ultramafic Mass, Mikabu belt

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