Tropicana translated: a foreland thrust system imbricate fan setting forc.2520 Ma orogenic gold mineralization at the northern margin of the Albany–Fraser Orogen, Western Australia

2017 ◽  
Vol 453 (1) ◽  
pp. 225-245 ◽  
Author(s):  
S. A. Occhipinti ◽  
I. M. Tyler ◽  
C. V. Spaggiari ◽  
R. J. Korsch ◽  
C. L. Kirkland ◽  
...  
Keyword(s):  
Western Australia ◽  
Gold Mineralization ◽  
Orogenic Gold ◽  
Northern Margin ◽  
Thrust System ◽  
Orogenic Gold Mineralization

U-Pb and Sm-Nd Evidence for Episodic Orogenic Gold Mineralization in the Kalgoorlie Gold Camp, Yilgarn Craton, Western Australia

2021 ◽  
Author(s):  
Jordan A. McDivitt ◽  
Steffen G. Hagemann ◽  
Anthony I.S. Kemp ◽  
Nicolas Thébaud ◽  
Christopher M. Fisher ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Western Australia ◽  
Late Stage ◽  
Gold Mineralization ◽  
Hydrothermal Systems ◽  
Orogenic Gold ◽  
Yilgarn Craton ◽  
Gold Telluride ◽  
Icp Ms ◽  
Metamorphic Fluids

Abstract Different genetic and timing models for gold mineralization in the Kalgoorlie gold camp (Yilgarn craton, Western Australia) suggest either broadly synchronous, late-stage mineralization related to metamorphic fluids at ca. 2640 Ma or a punctuated mineralization history from ca. 2675 to 2640 Ma with the involvement of early magmatic-hydrothermal systems (represented by the Fimiston, Hidden Secret, and Oroya gold-telluride lodes) and late metamorphic fluids (represented by the Mt. Charlotte gold stockwork veins). The results of U-Pb and Sm-Nd geochronological studies of zircon, apatite, and titanite from pre-ore dikes and syn-ore dikes constrain the absolute timing of mineralization and provide new evidence to this timing controversy. Emplacement ages constrained by U-Pb sensitive high-resolution ion microprobe (SHRIMP) zircon data are interpreted to be similar for both the pre-ore dikes (n = 10) and syn-ore dikes (n = 7) at ca. 2675 Ma. An inferred emplacement age of ca. 2675 Ma for the syn-ore dikes is supported by a Sm-Nd isochron age from apatite (laser ablation-inductively coupled plasma-mass spectrometry; LA-ICP-MS) of 2678 ± 15 Ma and by a U-Pb titanite age (LA-ICP-MS) of 2679 ± 6 Ma. The results of chemical abrasion-isotope dilution-thermal ionization mass spectrometry U-Pb zircon analysis from the pre- and syn-ore dikes are complicated by multistage Pb loss, reverse discordance, and potential inheritance. However, the data are compatible with the emplacement of Fimiston/Hidden Secret gold mineralization at ca. 2675 Ma and suggest a younger age for Oroya mineralization at ca. 2665 Ma. These results contrast with models for orogenic gold deposits that invoke broadly synchronous, late-stage mineralization related to metamorphic fluids at ca. 2640 Ma. The bulk of the Kalgoorlie gold camp’s estimated 2,300 t Au endowment was emplaced at ca. 2675 Ma as Fimiston/Hidden Secret Au mineralization. This early Au mineralization was deformed and overprinted twice by subordinate Au mineralization at ca. 2665 (Oroya mineralization) and ca. 2640 Ma (Mt. Charlotte mineralization). Gold mineralization in the Kalgoorlie gold camp was protracted in nature from ca. 2675 to 2640 Ma and reflects the interplay of early magmatic (Fimiston, Hidden Secret, Oroya) and late metamorphic (Mt. Charlotte) hydrothermal fluid systems in the formation of hybrid intrusion-related and metamorphic orebodies.

The Role of a Transcrustal Shear Zone in Orogenic Gold Mineralization at the Ajjanahalli Mine, Dharwar Craton, South India

2004 ◽  
Vol 99 (4) ◽  
pp. 743-759 ◽  
Author(s):  
J. Kolb ◽  
A. Hellmann ◽  
A. Rogers ◽  
S. Sindern ◽  
T. Vennemann ◽  
...  
Keyword(s):  
Shear Zone ◽  
South India ◽  
Gold Mineralization ◽  
Dharwar Craton ◽  
Orogenic Gold ◽  
Orogenic Gold Mineralization

The Geology and Mineralogy of the Loulo Mining District, Mali, West Africa: Evidence for Two Distinct Styles of Orogenic Gold Mineralization

2013 ◽  
Vol 108 (2) ◽  
pp. 199-227 ◽  
Author(s):  
D. M. Lawrence ◽  
P. J. Treloar ◽  
A. H. Rankin ◽  
P. Harbidge ◽  
J. Holliday
Keyword(s):  
West Africa ◽  
Gold Mineralization ◽  
Orogenic Gold ◽  
Mining District ◽  
Orogenic Gold Mineralization
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