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Incompatible element
About: Incompatible element is a research topic. Over the lifetime, 2420 publications have been published within this topic receiving 154052 citations.
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TL;DR: In this paper, two forms of chemical variation can be distinguished: (1) an igneous-type differentiation, involving tholeiitic iron enrichment accompanied by increases in some incompatible elements, and decreases in the transition trace elements; (2) metamorphic fractionation effects resulting in deficiencies in K, Rb, Sr, Ba, Zr, and enhancement in Na in the highest grade rocks.
Abstract: The metabasites were originally minor intrusions which are now characterised by wholly metamorphic textures and mineral assemblages diagnostic of an amphibolite-granulite facies transition. Two forms of chemical variation can be distinguished: (1) an igneous-type differentiation, involving tholeiitic iron enrichment accompanied by increases in some incompatible elements, and decreases in the transition trace elements; (2) metamorphic fractionation effects resulting in deficiencies in K, Rb, Sr, Ba, Zr, and enhancement in Na in the highest grade rocks. These distributions closely parallel those in the host acid-intermediate charnockitic gneisses. The data preclude the possibility that the deficiencies were caused by removal of melts from the granulites. The metamorphism closely followed intrusion, and it is unlikely that the fractionations were caused by secondary dehydration of once hydrous assemblages. The preferred model involves intrusion and crystallisation directly under high-grade conditions, possibly with CO2-rich fluids playing an important role in suppressing the formation of hydrous minerals.
39 citations
TL;DR: In this paper, the chemical properties of the ultramafic-gabbroys are analyzed in terms of olivine and pyroxene settling from a tholeiitic high-Mg magma with 15-20 wt.% MgO derived by 30-40% partial melting of an undepleted mantle.
39 citations
TL;DR: The Laohutai Formation of Ne- or Hy-normative alkali basalts are characterized by positive Eu and Sr anomalies and show higher e Nd (t) (3.2-5.3) than the coexisting alkali basins (1.8-2.4).
38 citations
TL;DR: The Haobugao skarn Fe-Zn polymetallic deposit is located in the Southern Great Xing'an Range, northeastern China, and hosted in the Lower Permian carbonates as mentioned in this paper.
38 citations
TL;DR: In this article, the major and trace-element distribution in the metabasites of the Nevado-Filabride Complex (Betic Cordilleras, Spain) suggests that the whole mafic-ultramafic association represents a dismembered ophiolitic sequence.
38 citations