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Exploring the plutonic-volcanic link: a zircon U-Pb, Lu-Hf and O isotope study of paired volcanic and granitic units from southeastern Australia

Published online by Cambridge University Press:  11 January 2017

A.I.S. Kemp ,
C.J. Hawkesworth ,
B.A. Paterson ,
G.L. Foster ,
P.D. Kinny ,
M.J. Whitehouse ,
R. Maas  and
EIMF
A.I.S. Kemp
Affiliation:
Department of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK, e-mail: [email protected]
C.J. Hawkesworth
Affiliation:
Department of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK, e-mail: [email protected]
B.A. Paterson
Affiliation:
Department of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK, e-mail: [email protected]
G.L. Foster
Affiliation:
Department of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK, e-mail: [email protected]
P.D. Kinny
Affiliation:
The Institute for Geoscience Research, Curtin University, Perth, Australia, e-mail: [email protected]
M.J. Whitehouse
Affiliation:
Swedish Museum of Natural History, Stockholm, Sweden, e-mail: [email protected]
R. Maas
Affiliation:
School Of Earth Sciences, University of Melbourne, Parkville, Victoria, Australia, e-mail: [email protected]
EIMF
Affiliation:
Edinburgh Ion Microprobe Facility, School of Geosciences, University of Edinburgh, Edinburgh, UK, e-mail: [email protected]
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Abstract

The relationship between plutonic and volcanic rocks is central to understanding the geochemical evolution of silicic magma systems, but it is clouded by ambiguities associated with unravelling the plutonie record. Here we report an integrated U-Pb, O and Lu-Hf isotope study of zircons from three putative granitic-volcanic rock pairs from the Lachlan Fold Belt, southeastern Australia, to explore the connection between the intrusive and extrusive realms. The data reveal contrasting petrogenetic scenarios for the S- and I-type pairs. The zircon Hf-O isotope systematics in an 1-type dacite are very similar to those of their plutonie counterpart, supporting an essentially co-magmatic relationship between these units. The elevated δ18O of zircons in these I-type rocks confirm a significant supracrustal source component. The S-type volcanic rocks are not the simple erupted equivalents of the granites, although the extrusive and plutonie units can be related by open-system magmatic evolution. Zircons in the S-type rocks define covariant εΗf—βO arrays that attest to mixing or assimilation processes between two components, one being the Ordovician metasedimentary country rocks, the other either an I-type magma or a mantle-derived magma. The data are consistent with models involving incremental melt extraction from relatively juvenile magmas undergoing open-system differentiation at depth, followed by crystal-liquid mixing upon emplacement in shallow magma reservoirs, or upon eruption. The latter juxtaposes crystals with markedly different petrogenetic histories and determines whole-rock geochemical and textural properties. This scenario can explain the puzzling decoupling between the bulk rock isotope and geochemical compositions commonly observed for granite suites.

Keywords

Hf isotopeLachlan Fold BeltO isotopeSilicic magmazircon
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 97 , Issue 4 , 2008 , pp. 337 - 355
Copyright
Copyright © The Royal Society of Edinburgh 2008

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