Tracking crystal-melt segregation and magma recharge using zircon trace element data

The Cretaceous Yunshan caldera complex in SE China consists of an unusual coexisting assemblage of peraluminous and peralkaline rhyolites and a resurgent intra-caldera porphyritic quartz monzonite. In this study, we use zircon trace element data to study the compositional differences of zircons from...

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Bibliographic Details
Published in:Chemical geology 2020-06, Vol.542, p.119596, Article 119596
Main Authors: Yan, Li-Li, He, Zhen-Yu, Klemd, Reiner, Beier, Christoph, Xu, Xi-Sheng
Format: Article
Language:English
Subjects:
Crystal–melt segregation
Magma differentiation
Magma recharge
SE China
Yunshan caldera complex
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Summary:The Cretaceous Yunshan caldera complex in SE China consists of an unusual coexisting assemblage of peraluminous and peralkaline rhyolites and a resurgent intra-caldera porphyritic quartz monzonite. In this study, we use zircon trace element data to study the compositional differences of zircons from cogenetic magmas and to track the evolution of the entire magmatic system. Our results indicate that the zircons from the peraluminous and peralkaline rhyolites formed from highly evolved compositions with high Hf concentrations and low Ti contents, and low Th/U and Zr/Hf ratios, which are distinct from those of the intrusive porphyritic quartz monzonite. Zircons from the peraluminous and peralkaline rhyolites display overlapping Zr/Hf and Hf, but the zircons from the peralkaline rhyolites have extremely low Eu/Eu* ratios (
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2020.119596