| 安徽省绩溪黑云母二长花岗岩中高铁铁橄榄石大斑晶的研究 |
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| 引用本文： | 戴延龄,李殿东,于桂梅,赵良超.安徽省绩溪黑云母二长花岗岩中高铁铁橄榄石大斑晶的研究[J].岩石矿物学杂志,1990(2). |
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| 作者姓名： | 戴延龄 李殿东 于桂梅 赵良超 |
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| 作者单位： | 安徽省地质科学研究所
(戴延龄)，吉林省地质科学研究所
(李殿东，于桂梅)，吉林省地质科学研究所(赵良超) |
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| 摘 要： | 高铁铁橄榄石大斑晶产在安徽省绩溪县黑云母二长花岗岩中。岩石呈细粒花岗结构,矿物成分为条纹长石、更长石、石英和黑云母。大斑晶最大粒径可达5cm,其中含有微小的磁铁矿自形晶,呈浸染状或断续脉状。在表生条件下,高铁铁橄榄石局部氧化成褐铁矿。大斑晶的外形、颜色和光泽等酷似黑钨矿。 大斑晶形成于上地幔高温高压条件下,先从花岗岩浆中结晶出铁橄榄石的高压变晶,岩浆沿深断裂向上部运移过程中,随着氧分压的增加而氧化成高铁铁橄榄石。
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| 关 键 词： | 高铁铁橄榄石 大斑晶 |
A Study on Megaphenocrysts of Ferrifayalite from the Biotite Monzonitic Granite in Jixi, Anhui |
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| Dai Yanling.A Study on Megaphenocrysts of Ferrifayalite from the Biotite Monzonitic Granite in Jixi, Anhui[J].Acta Petrologica Et Mineralogica,1990(2). |
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| Authors: | Dai Yanling |
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| Institution: | Dai Yanling (Anhui Institute of Gaological Sciences)Li Diandong Yu Guimei Zhao Liangchao (Jilin Institute of Geological Sciences) |
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| Abstract: | Megaphenocrysts of ferrifayalite occur in biotite monzonitie granite in Jixi county, Anhui province. The rock shows finegrained granitic texture and consists of perthite, oligoclase, quartz and biotite. The megaphenoerysts can reach 5cm in grain size, and contain small euhedral magnetite crystals in the form of dissemination or discontinuous veins. Under hypergene conditions, ferrifayalite has been partly converted into limonite through oxidation, and the megaphenocryst is quite similar to wolframite in shape, color and luster.The megaphenoerysts were formed in upper mantle under the condition of high temperature and pressure. The high-pressure metaerysts of fayalite were first separated out from the granitic magma through crystallization; during the upward migration of magma along the deep fault, these metacrysts were oxidized into ferrifayalite with the increasing oxygen partial pressure. |
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| Keywords: | ferrifayalite megaphenocryst |
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