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This paper presents detailed SHRIMP zircon U–Pb chronology, mineral chemistry, major and trace element, and Sr–Nd–Hf isotope geochemistry of two Cenozoic plutons (Karibasheng and Kuzigan) in western Tibetan Plateau, China. The Karibasheng pluton is composed of monzogranite, and the Kuzigan pluton consists of syenogranite, diopside-bearing syenite and diopside syenite. SHRIMP zircon U–Pb dating on...
Proterozoic peralkaline nepheline syenite gneiss occurring at Sushina Hill (Paschim Banga, India) consists of minor eudialyte together with potassium feldspar, albite, aegirine, and nepheline. Perthites are absent and the precursor syenite is considered to have been a two feldspar sub-solidus eudialyte aegirine nepheline syenite . The major minerals have near-endmember compositions and are not altered...
The emplacement of anorogenic magmas, be they mantle-derived or crust-derived and silica-undersaturated or silica-oversaturated, marks a period of rifting or tectonic relaxation and apparent quiescence. In a given area, such magmatism commonly recurs episodically, and can yield even more strongly alkaline products than in the first cycle, in spite of the depletion that resulted from that episode of...
Major and trace-element microanalyses of the main minerals from the 610Ma Pedra Branca Syenite, southeast Brazil, allow inferences on intensive parameters of magmatic crystallization and on the partition of trace-elements among these minerals, with important implications for the petrogenetic evolution of the pluton. Two main syenite types make up the pluton, a quartz-free syenite with tabular alkali...
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