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  Using zircon trace element composition to assess porphyry copper potential of the Guichon Creek batholith and Highland Valley Copper deposit, south-central British Columbia

Lee, R. G., Byrne, K., D’Angelo, M., Hart, C. J., Hollings, P., Gleeson, S. A., Alfaro, M. (2021): Using zircon trace element composition to assess porphyry copper potential of the Guichon Creek batholith and Highland Valley Copper deposit, south-central British Columbia. - Mineralium Deposita, 56, 215-238.
https://doi.org/10.1007/s00126-020-00961-1

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Lee, Robert G.1, Autor
Byrne, Kevin1, Autor
D’Angelo, Michael1, Autor
Hart, Craig J.R.1, Autor
Hollings, Pete1, Autor
Gleeson, S. A.2, Autor              
Alfaro, Miguel1, Autor
Affiliations:
1External Organizations, ou_persistent22              
23.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146040              

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 Zusammenfassung: The Late Triassic Guichon Creek batholith is a large (~ 1800 km2), composite, zoned batholith that hosts several large porphyry Cu-Mo deposits of the Highland Valley Copper district. The batholith consists of intrusive rocks that range in composition from gabbro to quartz monzonite. Adjacent to the mafic margin of the batholith is the Gump Lake granodiorite to quartz monzonite stock. A new U-Pb zircon age of 218 ± 0.18 for the Gump Lake stock indicates that magmatism in the region began at least seven million years prior to the emplacement of the main Guichon Creek batholith rocks at 211 Ma. Zircons from fifteen samples from the Guichon Creek batholith were analyzed by laser ablation ICP-MS to characterize the magmatic evolution and ore fertility of the batholith. The trace element composition of zircon record early, lower crustal, fractional crystallization followed by five pulses of magma recharge and mixing in an upper-crustal, oxidized, magma chamber as well as degassing of the magmatic-hydrothermal fluids that formed the porphyry copper deposits. Zircons from the early barren rocks have chondrite-normalized Eu/EuN* values of 0.19 to 0.56 and estimated temperatures of 850 to 750 °C. The middle to late intrusions that host porphyry copper mineralization have zircon Eu/EuN* values of 0.30 to 0.74 and slightly lower estimated temperatures of 800 to 600 °C. Late porphyritic stocks and dikes from the mineralized centers contain zircon crystals elevated in Y, Nb, Ta, and REE concentration relative to zircon from the earlier intrusions. This distinct change in zircon composition coincides with the copper mineralization, suggesting that zircon chemistry can be used as a tool to identify the genetic evolution of a crystallizing magma chamber and potential for mineralization.

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Sprache(n): eng - Englisch
 Datum: 2020-02-102020-02-272021
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.1007/s00126-020-00961-1
GFZPOF: p4 T8 Georesources
OATYPE: Green Open Access
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Titel: Mineralium Deposita
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 56 Artikelnummer: - Start- / Endseite: 215 - 238 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals343
Publisher: Springer