Abstract
Close geochemical observation of the leucite-bearing mafic and ultramafic rocks suggests that any hypothesis to account for their origin must also explain the following features of these rocks:
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1.
Usually high K2O content, sometimes as high as 18%.
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2.
High K2O/Na2O ratio, in some cases the K2O/Al2O3 ratio being greater than 1.
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3.
Lower SiO2 contents relative to alkali basalts.
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4.
High enrichment of such trace elements as Rb, Sr, Nb, and Zr (characteristic of salic rocks).
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5.
High concentration of Ni and Cr (usually associated with ultramafic rocks) in leucitic rocks of some areas.
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© 1980 Springer-Verlag Berlin · Heidelberg
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Gupta, A.K., Yagi, K. (1980). Generation of Potassium-Rich Mafic and Ultramafic Magma Capable of Producing Leucite-Bearing Rocks. In: Petrology and Genesis of Leucite-Bearing Rocks. Minerals and Rocks, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67550-8_18
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DOI: https://doi.org/10.1007/978-3-642-67550-8_18
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-67552-2
Online ISBN: 978-3-642-67550-8
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