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Genetic significance of zircon in orthogneisses from Sierra Nevada (Betic Cordillera, Spain)

Published online by Cambridge University Press:  02 January 2018

M. D. Ruiz-Cruz  and
C. Sanz de Galdeano
M. D. Ruiz-Cruz*
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
C. Sanz de Galdeano
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada. Facultad de Ciencias, 18071 Granada, Spain
*
*E-mail: [email protected]
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Abstract

Zircon from two types of orthogneisses (inheritance-rich and inheritance-poor) from Sierra Nevada (Betic Cordillera, Spain) was investigated by integrating U–Pb geochronology, cathodoluminescence and back-scattered SEM imaging, laser-ablation inductively coupled plasma mass spectrometry analyses and Raman spectroscopy to examine the conditions of magmatic zircon growth and the variable extent and mechanisms of the Alpine modifications. Zircon from inheritance-rich gneiss consists of two main domains: inherited (Neoproterozoic-to-Early Paleozoic and Devonian) cores and magmatic overgrowths, which provided 206Pb/238U concordant ages of 286 ± 3 Ma. In inheritance-poor gneiss, zircons consist of magmatic cores and very altered rims defining a discordia with an upper intercept with the Concordia at 287 + 21 –22 Ma and a lower intercept at 20.8 + 48.6 –20.8 Ma. Magmatic domains of zircon from inheritance-rich gneiss have lower rare-earth element (REE) contents than magmatic domains from inheritance-poor gneiss, reflecting the less evolved nature of the melt. Altered domains in zircon from inheritance-poor gneisss how greater U concentrations, lower REE concentrations and lower Th/U ratios relative to the cores, interpreted as representing Pb loss from the U-rich magmatic domains during the Alpine event. Morphological changes within single grains and between populations reflects the evolution during magmatic cooling. We show that, whereas classic methods allow two different interpretations for the geodynamic setting of the two types of gneisses, a complete study of composition, morphology and structure of zircon can help to decide that a model based on a common source for the granitic melt better fits the zircon characteristics than a model based on melts generated in two different geotectonic settings.

Keywords

zircon geochemistryzircon morphologyzircon Raman spectroscopyzircon U–Pb ages
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 1 , February 2017 , pp. 77 - 101
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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