Eudialytic metasyenite (Kipawa Syenite Complex, Mesoproterozoic, 994 Ma; near the Kipawa River, Villedieu Township, Temiscamingue County, Quebec, Canada) 4 : 無料・フリー素材/写真
Eudialytic metasyenite (Kipawa Syenite Complex, Mesoproterozoic, 994 Ma; near the Kipawa River, Villedieu Township, Temiscamingue County, Quebec, Canada) 4 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Eudialytic metasyenite from the Precambrian of Quebec, Canada. (~6.1 centimeters across)Eudialyte is an attractive, rare, pinkish-red silicate mineral having a moderately complex chemistry. Eudialyte is a sodium-calcium-cesium-iron-manganese-yttrium-zirconium hydroxychlorosilicate (Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2). The rock seen here has a significant eudialyte component, along with sodic plagioclase feldspar (white) and arfvedsonite amphibole (black). It is a eudialytic peralkaline syenite (or metasyenite, as the rocks on the outcrop scale have a weakly developed, coarse-scale foliation). Geologic origin - published information indicates that the eudialyte is metasomatic in origin (= formed by the significant addition of chemicals to pre-existing rocks), and dates to about 994 million years (late Mesoproterozoic). The host syenite rock is mid-Mesoproterozoic in age (~1.24 billion years). It forms part of the Kipawa Syenite Complex in the Kipawa Syncline area of the Grenville Province, near the Grenville Province-Superior Province boundary.Locality - apparently the “rare-earth occurrence” locality of Currie & Van Breemen (1996 - Canadian Mineralogist 34: 435-451) and Currie (1998 - Geological Survey of Canada Current Research 1998-C: 167-172), near the Kipawa River between Lake Sheffield and Lake Sairs, Villedieu Township, south-central Témiscamingué County, southwestern Quebec, southeastern Canada |
| 撮影日 | 2019-08-23 20:05:36 |
| 撮影者 | James St. John |
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