New age constraints on metamorphism, metasomatism and gold mineralisation at Plutonic Gold Mine, Marymia Inlier, Western Australia

Content Provider	Semantic Scholar
Author	Gazley, Michael F. Millet, M. Handler, Monica R. Plessis, E. Du Baker, Joel A.
Copyright Year	2016
Abstract	ABSTRACTThe Plutonic Well Greenstone Belt (PWGB) is located in the Marymia Inlier between the Yilgarn and Pilbara cratons in Western Australia, and hosts a series of major Au deposits. The main episode of Au mineralisation in the PWGB was previously interpreted to have either accompanied, or shortly followed, peak metamorphism in the late Archean at ca 2650 Ma with a later, minor, event associated with the Capricorn Orogeny. Here we present new Pb isotope model ages for sulfides and Rb–Sr ages for mica, as well as a new 207Pb–206Pb age for titanite for samples from the Plutonic Gold Mine (Plutonic) at the southern end of the PWGB. The majority of the sulfides record Proterozoic Pb isotope model ages (2300–2100 Ma), constraining a significant Au mineralising event at Plutonic that occurred >300 Myr later than previously thought. A Rb–Sr age of 2296 ± 99 Ma from muscovite in an Au-bearing sample records resetting or closure of the Rb–Sr system in muscovite at about the same time. A younger Rb–Sr age of 1779...
Starting Page	413
Ending Page	426
Page Count	14
File Format	PDF HTM / HTML
DOI	10.1080/08120099.2016.1212924
Volume Number	63
Alternate Webpage(s)	http://orca-mwe.cf.ac.uk/94520/1/Gazley%20et%20al%20-%20Plutonic%20Geochron%20paper.pdf
Alternate Webpage(s)	http://orca.cf.ac.uk/94520/1/Gazley%20et%20al%20-%20Plutonic%20Geochron%20paper.pdf
Alternate Webpage(s)	https://doi.org/10.1080/08120099.2016.1212924
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article