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Morphology and geochemistry of zircons from late Mesozoic igneous complexes in coastal SE China: implications for petrogenesis

Published online by Cambridge University Press:  05 July 2018

X. Wang ,
W. L. Griffin ,
S. Y. O’Reilly ,
X. M. Zhou ,
X. S. Xu ,
S. E. Jackson  and
N. J. Pearson
X. Wang
Affiliation:
Department of Earth Sciences, Nanjing University, Nanjing 210093, China GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
W. L. Griffin
Affiliation:
GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia CSIRO Exploration and Mining, North Ryde, NSW 2113, Australia
S. Y. O’Reilly*
Affiliation:
GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
X. M. Zhou
Affiliation:
Department of Earth Sciences, Nanjing University, Nanjing 210093, China
X. S. Xu
Affiliation:
Department of Earth Sciences, Nanjing University, Nanjing 210093, China GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
S. E. Jackson
Affiliation:
GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
N. J. Pearson
Affiliation:
GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
*
*E-mail: sue.oreilly@mq.edu.au
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Abstract

The Pingtan and Tonglu igneous complexes in SE China are typical of the calc-alkaline series developed at active continental margins. These two complexes are dominated by felsic rocks, temporally and spatially associated with minor mafic rocks. Morphological and trace-element studies of zircon populations in rocks from each of these complexes show that the zircon populations may be divided into 3–4 distinct growth stages, characterized by different distributions of morphological indices (Ipr, Ipy and Iel), and different contents of the substituting elements (Hf, U, Th, Y and P). The four growth stages recognized in the zircons are believed to have formed successively in the magma chamber, during the emplacement, and in the early and later stages of magma consolidation, respectively. All four stages are recognized in the plutonic Pingtan complex, whereas the stages 3 and 4 are less developed in the volcanic/subvolcanic Tonglu complex. Based on the chemistry and morphology of the different zircon populations of the Pingtan and Tonglu complexes, it is suggested that basaltic magmas underplating at the boundary between crust and mantle caused partial melting of the mid–lower crust and produced granitoid magmas. Subsequently, mixing between magmas was important.

Keywords

zirconzircon morphologyzircon trace elementsigneous complexunderplatingmagma mixing
Type
Research Article
Information
Mineralogical Magazine , Volume 66 , Issue 2 , April 2002 , pp. 235 - 251
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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