Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653 book
Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653 book
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Author: Alan R Wallace
Page Count: 26 pages
Published Date: 22 Mar 2013
Publisher: Bibliogov
Publication Country: United States
Language: English
Format: Pdf
ISBN: 9781288975099
File size: 12 Mb
File Name: Occurrence.of.Uranium.in.Rocks.of.the.Intrusive.Complex.at.Ekiek.Creek,.Western.Alaska.Usgs.Open-File.Report.79-1653.pdf
Download Link: Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska Usgs Open-File Report 79-1653
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Uranium in the Ekiek Creek Complex of western Alaska is related to a niobium-rich pyrochlore in the nepheline syenite of the complex. The complex consists of an aegirine-phlogopite pyroxenite that has been intruded and partly replaced by nepheline syenite. The contact zone between the two igneous units varies from a sharp contact to a diffuse zone where the pyroxenite has been metasomatically replaced by the syenite. The entire complex was intruded into an older Cretaceous monzonite. The pyrochlore occurs as an accessory mineral in the syenite, and is visible in rocks containing over 50 ppm uranium. Chemical analyses indicate that, in all samples of syenite, there is a positive correlation between uranium and niobium; this suggests that the uranium-pyrochlore association persists even when pyrochlore is not readily visible in thin section. The small amount of pyrochlore, and its refractory nature, make the complex an unfavorable source for secondary uranium leaching or heavy-mineral concentration.
Read online Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653 Buy and read online Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653 Download and read Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653
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Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653. Alan R Wallace
Author: Alan R Wallace
Page Count: 26 pages
Published Date: 22 Mar 2013
Publisher: Bibliogov
Publication Country: United States
Language: English
Format: Pdf
ISBN: 9781288975099
File size: 12 Mb
File Name: Occurrence.of.Uranium.in.Rocks.of.the.Intrusive.Complex.at.Ekiek.Creek,.Western.Alaska.Usgs.Open-File.Report.79-1653.pdf
Download Link: Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska Usgs Open-File Report 79-1653
---------------------------------------------------------------
Uranium in the Ekiek Creek Complex of western Alaska is related to a niobium-rich pyrochlore in the nepheline syenite of the complex. The complex consists of an aegirine-phlogopite pyroxenite that has been intruded and partly replaced by nepheline syenite. The contact zone between the two igneous units varies from a sharp contact to a diffuse zone where the pyroxenite has been metasomatically replaced by the syenite. The entire complex was intruded into an older Cretaceous monzonite. The pyrochlore occurs as an accessory mineral in the syenite, and is visible in rocks containing over 50 ppm uranium. Chemical analyses indicate that, in all samples of syenite, there is a positive correlation between uranium and niobium; this suggests that the uranium-pyrochlore association persists even when pyrochlore is not readily visible in thin section. The small amount of pyrochlore, and its refractory nature, make the complex an unfavorable source for secondary uranium leaching or heavy-mineral concentration.
Read online Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653 Buy and read online Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653 Download and read Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Occurrence of Uranium in Rocks of the Intrusive Complex at Ekiek Creek, Western Alaska : Usgs Open-File Report 79-1653
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