The geology, geochemistry, and magmatic evolution of the Legris Lake mafic-ultramafic complex, Ontario, Canada

被引:2
|
作者
Bain, Wyatt M. M. [1 ,2 ]
Hollings, Pete [1 ]
Djon, Lionnel M. M. [3 ]
Brzozowski, Matthew J. J. [1 ,2 ]
Layton-Matthews, Daniel [4 ]
Dobosz, Agatha [4 ]
机构
[1] Lakehead Univ, Dept Geol, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada
[2] British Columbian Geol Survey, 1810 Blanshard St, Victoria, BC V8T 4J1, Canada
[3] Impala Canada, 69 Yonge St,Suite 700, Toronto, ON M5E 1K3, Canada
[4] Queens Univ, Dept Geol Sci & Geol Engn, Kingston, ON K7L 3N6, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Ore deposit-Layered mafic intrusions-Ni-Cu-PGE; Archean; Sm-Nd isotopes-Multiple sulfur isotopes; PLATINUM-GROUP ELEMENT; MULTIPLE SULFUR ISOTOPES; ILES INTRUSIVE COMPLEX; SUPERIOR PROVINCE; SULFIDE MINERALIZATION; TECTONIC SIGNIFICANCE; MIDCONTINENT RIFT; BUSHVELD COMPLEX; COLDWELL COMPLEX; CUMULATE ROCKS;
D O I
10.1007/s00126-023-01183-x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Archean Legris Lake mafic-ultramafic complex (LLC) is spatially (similar to 12 km east) and temporally (2690.59 +/- 0.77 Ma) associated with the world-class Lac des Iles (LDI) palladium deposit. Modeling of whole-rock major-element compositions suggests that this complex, previously interpreted as gabbroic, is gabbronoritic in composition, adding to the likely association between LDI and the LLC. Mantle normalized trace-element profiles and modeled parental melt compositions from the cumulate lithologies indicate initial melt extraction from a metasomatized mantle source in an arc setting and subsequent crystallization of olivine, orthopyroxene, and plagioclase at depth following assimilation of SiO2 and S from tonalitic country rock. External S assimilation contributed to sulfide saturation at depth prior to or during emplacement, but sulfide melt entrainment in intruding magmas and its retention at the site of emplacement was variable. These interpretations are supported by (1) variations in Cu/Pd ratios between PGE-rich and PGE-poor lithologies, (2) the strongly negative Eu/Eu* of paragenetically early lithologies, (3) the overlap between whole-rock epsilon Nd-(T) values of LLC lithologies and Wabigoon tonalite, and (4) the positive delta S-34 and uniformly non-zero Delta S-33 values of magmatic sulfides. During emplacement the intruding melts also assimilated metasedimentary country rock. This effect likely became more pervasive during later stages and resulted in additional melt fractionation and inheritance of the trace-element signature of the metasedimentary country rock by the intruding magmas. This assimilation does not, however, seem to have been an important driver of sulfide saturation in this system.
引用
收藏
页码:85 / 108
页数:24
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