Trace element geochemistry and Nd-Sr isotope systematics of Scheelite from the Thunder Creek and 144 Gap deposits, Timmins, Ontario: implications for timing and genesis of gold
In: Electronic Thesis and Dissertation Repository, 2018
Online
academicJournal
Zugriff:
The age of the youngest gold event at the Timmins West Mine is unknown. Scheelite geochemistry and geochronology at the TWM were constrained using WDS and EDS mapping, LA-ICPMS and MC-ICPMS analytical techniques. Trace element analyses by LA-ICPMS revealed scheelites mineralized from a common and oxidized fluid. Samarium-Neodymium isotopic analyses of 15 scheelite grains yielded a linear regression isochron with a corresponding age of 2587 +/- 49 Ma (MSWD = 2.5) and εNdi, calculated from CHUR, of 1.01 ± 0.11 (2SD). A second internal isochron from a single scheelite grain yielded an age of 2516 +/- 88 Ma (MSWD = 0.64). Strontium isotopic compositions of scheelites have 87Sr/86Sri at 2.6 Ga varying from 0.70116 to 0.70178, corresponding to εSri, calculated from CHUR, of -0.05 ± 3.97 (2SD). Scheelite formation, and possibly gold, at the TWM was late compared to magmatic intrusions in the southern Abitibi.
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Trace element geochemistry and Nd-Sr isotope systematics of Scheelite from the Thunder Creek and 144 Gap deposits, Timmins, Ontario: implications for timing and genesis of gold
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Autor/in / Beteiligte Person: | Van Kessel, Annika |
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Zeitschrift: | Electronic Thesis and Dissertation Repository, 2018 |
Veröffentlichung: | Scholarship@Western, 2018 |
Medientyp: | academicJournal |
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