書誌事項
- タイトル別名
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- Quantification of the Textural Variation in Alkaline lgneous Intrusion by Spatial Correlation Function: Murotomisaki Gabbroic Complex
- クウカン ソウカン カンスウ ニ ヨル エンキセイ カセイカンニュウガンタイ
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説明
The texture of igneous rocks from the Murotomisaki gabbroic complex, Shikoku island, were quantitatively studied by means of a digital image analysis coupled with the two point spatial correlation method. The complex has a layered structure and a considerable variation of modal composition and the texture. Seven samples at different stratigraphic positions of the complex were selected for the textural analysis. Two kinds of correlation functions, σ and τ distributions, for olivine, pyroxene and plagioclase were calculated from digital images taken from photomicrographs of each sample. Significant variation of the slope of the τ distribution at zero distances for plagioclase-pyroxene and olivine-pyroxene pairs were observed among the samples. In order to interpret the textural variation in terms of the crystallization history and kinetics, a series of computer simulation based on a simple geometric model was conducted in which two new phases appear in an old phase in different sequences and with different timing. The σ and τ distributions were also calculated for simulated textures. We compared with the simulated textures and observed textures on the Murotomisaki gabbro. As a result, it was inferred that olivine preceded the plagioclase precipitation near the margin of the body while the plagioclase preceded the olivine precipitation in the interior.
収録刊行物
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- 火山
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火山 43 (5), 283-295, 1998
特定非営利活動法人 日本火山学会
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詳細情報 詳細情報について
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- CRID
- 1390001204303615872
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- NII論文ID
- 110003041139
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- NII書誌ID
- AN10512786
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- ISSN
- 21897182
- 04534360
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- NDL書誌ID
- 4605248
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
