U-Pb zircon age for the Etheridge Group, Georgetown region, north Queensland: implications for relationship with the Broken Hill and Mt Isa sequences

被引:44
作者
Black, LP
Gregory, P
Withnall, IW
Bain, JHC
机构
[1] Australian Geol Survey Org, Minerals Div, Canberra, ACT 2601, Australia
[2] BHP Minerals, Explorat Dept, Spring Hill, Qld 4004, Australia
[3] Geol Survey Queensland, Brisbane, Qld 4001, Australia
关键词
Etheridge Group; intrusive rocks; Proterozoic; uranium-lead SHRIMP dating; zircon;
D O I
10.1080/08120099808728446
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Einasleigh Metamorphics are the lowest exposed component of the Etheridge Group, part of the Etheridge Province, in the Georgetown region of north Queensland. Previous dating of granites has imposed a younger age limit of about 1550 Ma for the depositional age of the Etheridge Group. Based on SHRIMP U-Pb analyses of zircon from mafic (1674.9 +/- 3.3 Ma and 1655.9 +/- 2.2 Ma) and felsic (1695.8 +/- 1.5 Ma and 1684.2 +/- 2.1 Ma) intrusive rocks in the Einasleigh Metamorphics, it can now be demonstrated that deposition commenced at about 1700 Ma, and continued for an estimated 100 million years. The stratabound, base-metal deposits in the Mt Isa Inlier, Broken Hill Block and McArthur Basin formed in the early part of this time span, thereby suggesting potential for these styles of mineralisation in the Georgetown region.
引用
收藏
页码:925 / 935
页数:11
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