Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by Wang, X. Articles by Pearson, N. J. Search for Related Content GeoRef GeoRef Citation

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

¹ Department of Earth Sciences, Nanjing University, Nanjing 210093, China
² GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
³ CSIRO Exploration and Mining, North Ryde, NSW 2113, Australia

^* E-mail: sue.oreilly{at}mq.edu.au

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 (I_pr, I_py and I_el), 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: zircon, zircon morphology, zircon trace elements, igneous complex, underplating, magma mixing

This article has been cited by other articles:

				P. W. O. Hoskin, P. W. O. Hoskin, and U. Schaltegger The Composition of Zircon and Igneous and Metamorphic Petrogenesis Reviews in Mineralogy and Geochemistry, January 1, 2003; 53(1): 27 - 62. [Full Text] [PDF]