Abstract/Details

Experimental study of the partitioning of copper, silver, gold, molybdenum, and tungsten among pyrrhotite and immiscible iron-sulfur-oxygen and silicate melts


2007 2007

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Abstract (summary)

Partition coefficients have been determined for several transition metals amongst a rhyolitic silicate melt, pyrrhotite, and an immiscible Fe-S-O melt. Two sets of experiments were performed in sealed silica tubes at 1035°C-1045°C, FMQ-NNO fO2, and logfS 2 ∼1 bar, and analyzed by EMPA and LA-ICP-MS. One set of experiments with Au, Ag, and Cu added yielded ([special characters omitted]) [special characters omitted]=300±100,[special characters omitted] =120±20, [special characters omitted]>200, and [special characters omitted]=120±50, [special characters omitted]=58±8, [special characters omitted]>200. The other set of experiments with Mo and W added yielded [special characters omitted]=90±10, [special characters omitted]9±3 and [special characters omitted]=35±3, [special characters omitted]=1.2±0.6x10-3. Some preliminary data are also presented on the partitioning of Si, Ti, V, Co, Zn, Re, Th and U. Modeling predicts the loss to a daughter melt of up to 50% of the initial Au, >37% Cu, 24% Ag, 19% Mo, and 2% W when Fe-S-O melts are removed with other cumulate phases during fractionation. This would reduce the metal available to potential intrusion-related hydrothermal ore deposits.

Indexing (details)


Subject
Geology;
Geochemistry
Classification
0372: Geology
0996: Geochemistry
Identifier / keyword
Earth sciences
Title
Experimental study of the partitioning of copper, silver, gold, molybdenum, and tungsten among pyrrhotite and immiscible iron-sulfur-oxygen and silicate melts
Author
Mengason, Michael J.
Number of pages
113
Publication year
2007
Degree date
2007
School code
0117
Source
MAI 46/04M, Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549394822
Advisor
Candela, Philip A.; Piccoli, Philip M.
University/institution
University of Maryland, College Park
Department
Geology
University location
United States -- Maryland
Degree
M.S.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
1451064
ProQuest document ID
304853687
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304853687
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