Zirconolite, zircon and monazite-(Ce) U-Th-Pb age constraints on the emplacement, deformation and alteration history of the Cummins Range Carbonatite Complex, Halls Creek Orogen, Kimberley region, Western Australia
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- 作者：Peter J. Downes ; Daniel J. Dunkley ; Ian R. Fletcher…
- 刊名：Mineralogy and Petrology
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：110
- 期：2-3
- 页码：199-222
- 全文大小：1,951 KB
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Daniel J. Dunkley (2)
Ian R. Fletcher (2)
Neal J. McNaughton (3)
Birger Rasmussen (2)
A. Lynton Jaques (4)
Michael Verrall (5)
Marcus T. Sweetapple (5) (6)
1. Department of Earth and Planetary Sciences, Western Australian Museum, Locked Bag 49, Welshpool DC, WA, 6986, Australia
2. Department of Applied Geology, Curtin University, Perth, WA, 6945, Australia
3. John de Laeter Centre for Isotope Research, Department of Applied Physics, Curtin University, Perth, WA, 6945, Australia
4. Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia
5. CSIRO Earth Sciences and Resource Engineering, 26 Dick Perry Avenue, Kensington, Perth, WA, 6151, Australia
6. Centre for Exploration Targeting, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia - 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Mineralogy
Geochemistry - 出版者：Springer Wien
- ISSN：1438-1168
文摘
In situ SHRIMP U-Pb dating of zirconolite in clinopyroxenite from the Cummins Range Carbonatite Complex, situated in the southern Halls Creek Orogen, Kimberley region, Western Australia, has provided a reliable 207Pb/206Pb age of emplacement of 1009 ± 16 Ma. Variably metamict and recrystallised zircons from co-magmatic carbonatites, including a megacryst ~1.5 cm long, gave a range of ages from ~1043–998 Ma, reflecting partial isotopic resetting during post-emplacement deformation and alteration. Monazite-(Ce) in a strongly foliated dolomite carbonatite produced U-Th-Pb dates ranging from ~900–590 Ma. Although the monazite-(Ce) data cannot give any definitive ages, they clearly reflect a long history of hydrothermal alteration/recrystallisation, over at least 300 million years. This is consistent with the apparent resetting of the Rb-Sr and K-Ar isotopic systems by a post-emplacement thermal event at ~900 Ma during the intracratonic Yampi Orogeny. The emplacement of the Cummins Range Carbonatite Complex probably resulted from the reactivation of a deep crustal structure within the Halls Creek Orogen during the amalgamation of Proterozoic Australia with Rodinia over the period ~1000–950 Ma. This may have allowed an alkaline carbonated silicate magma that was parental to the Cummins Range carbonatites, and generated by redox and/or decompression partial melting of the asthenospheric mantle, to ascend from the base of the continental lithosphere along the lithospheric discontinuity constituted by the southern edge of the Halls Creek Orogen. There is no evidence of a link between the emplacement of the Cummins Range Carbonatite Complex and mafic large igneous province magmatism indicative of mantle plume activity. Rather, patterns of Proterozoic alkaline magmatism in the Kimberley Craton may have been controlled by changing plate motions during the Nuna–Rodinia supercontinent cycles (~1200–800 Ma).