Mercury Deposits of Southwestern Alaska PDF Download
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Author:
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ISBN:
Category : Mercury
Languages : en
Pages : 57
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Author:
Publisher:
ISBN:
Category : Mercury
Languages : en
Pages : 57
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Author: Franklin A. Rutledge
Publisher:
ISBN:
Category : Akiak (Alaska)
Languages : en
Pages : 32
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Author: John E. Gray
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ISBN:
Category :
Languages : en
Pages :
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A belt of small but numerous mercury deposits extends for about 500 km in the Kuskokwim River region of southwestern Alaska. The southwestern Alaska mercury belt is part of widespread mercury deposits of the circum Pacific region that are similar to other mercury deposits throughout the world because they are epithermal with formation temperatures of about 200 ?C, the ore is dominantly cinnabar with Hg-Sb-As?Au geochemistry, and mineralized forms include vein, vein breccias, stockworks, replacements, and disseminations. The southwestern Alaska mercury belt has produced about 1400 t of mercury, which is small on an international scale. However, additional mercury deposits are likely to be discovered because the terrain is topographically low with significant vegetation cover. Anomalous concentrations of gold in cinnabar ore suggest that gold deposits are possible in higher temperature environments below some of the Alaska mercury deposits. We correlate mineralization of the southwestern Alaska mercury deposits with Late Cretaceous and early Tertiary igneous activity. Our 40Ar/39Ar ages of 70 ?3 Ma from hydrothermal sericites in the mercury deposits indicate a temporal association of igneous activity and mineralization. Furthermore, we suggest that our geological ancl geochemical data from the mercury deposits indicate that ore fluids were generated primarily in surrounding sedimentary wall rocks when they were cut by Late Cretaceous and early Tertiary intrusions. In our ore genesis model, igneous activity provided the heat to initiate dehydration reactions and expel fluids from hydrous minerals and formational waters in the surrounding sedimentary wall rocks, causing thermal convection and hydrothermal fluid flow through permeable rocks and along fractures and faults. Our isotopic data from sulfide and alteration minerals of the mercury deposits indicate that ore fluids were derived from multiple sources, with most ore fluids originating from the sedimentary wall rocks.
![Red Devil Mine, Sleitmut Area, Southeastern [i.e. Southwestern] Alaska PDF](https://books.google.com/books/content/images/frontcover/Pp4fnQEACAAJ?fife=w80-h100)
Author: United States. Bureau of Mines
Publisher:
ISBN:
Category : Mercury mines and mining
Languages : en
Pages : 21
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Author: John E. Gray
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 48
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Short articles summarize environmental geochemical studies of metallic mineral deposits in Alaska, including massive sulfide, gold, mercury, chromium, and uranium mines and deposits. The studies report metal and acid concentrations in samples collected around such mines and deposits, and evaluate environmental effects of the deposits. The articles are written in a style intended to reach a general audience.
Author: Franklin A. Rutledge
Publisher:
ISBN:
Category : Mercury mines and mining
Languages : en
Pages : 22
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Author:
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ISBN:
Category :
Languages : en
Pages :
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The Geophysical Institute at the University of Alaska Fairbanks offers the full text of the October 22, 1999 article entitled "Mercury Found in Fish of Southwest Alaska," written by Ned Rozell. The university presents the article as part of the Alaska Science Forum. Fish in southwest Alaska have been found to contain high levels of mercury. Fish eat plankton and algae, which ingest mercury from the air or minerals in the water.
Author: John E. Gray
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 48
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Book Description
Short articles summarize environmental geochemical studies of metallic mineral deposits in Alaska, including massive sulfide, gold, mercury, chromium, and uranium mines and deposits. The studies report metal and acid concentrations in samples collected around such mines and deposits, and evaluate environmental effects of the deposits. The articles are written in a style intended to reach a general audience.
Author:
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ISBN:
Category : Environmental geochemistry
Languages : en
Pages : 2
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Author: Wallace Martin Cady
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ISBN:
Category : Ore deposits
Languages : en
Pages : 7
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