The variation of cesium and 37 other elements in the Sardinian granite batholith, and the significance of cesium for granite petrogenesis

Article Abstract:

Granite samples from the Sardinian granite batholith in Italy are studied to statistically determine the relationship between cesium (Cs) and 37 other elements by making use of factor analysis. Cs is not associated with any major elements but shows close correlation with elements such as lithium (Li), tin (Sn) and rubidium (Rb). With thallium (Tl) and beryllium (Be) it is associated to a lesser extent. The amount of mica and feldspar entering the melt during anatexis determines the relationship between Cs and other elements. The distribution of Cs is affected by magma mixing, crystal fractionation and the process of partial melting in the magmatic source region.

Italy, Analysis, Usage, Cesium, Factor analysis, Discriminant analysis, Granite

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Nature of the crust in Maine, USA: evidence from the Sebago batholith

Article Abstract:

Chemical and isotopic analysis of evolved and crustally derived granites allows detailed estimation of the source and the magmatic processes. The study of rare earth elements (REE) and Nd isotopic composition of the Sebago batholith granite in Maine, New England shows that the two-mica granites in the southern and central portion, and at the periphery have distinct REE patterns. The magma has generated in fertile metasedimentary rocks at mid-crustal levels. Nd isotope analysis shows that magma have arisen from Avalon-like crust and Central Maine Belt metasedimentary rocks.

Research, Measurement, Maine, Neodymium, Rare earth metals, Rocks

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Exposure of a Late Cretaceous layered mafic-felsic magma system in the central Sierra Nevada batholith, California

Article Abstract:

Insufficient zircon inheritance in the units studied backs the isotopic evidence that the Lamarck and other Late Cretaceous Sierran plutons were obtained from young crust. The significance of basaltic liquids in the evolution of continental crust in arc settings are indicated by the identification of an extensive mafic-felse magma system in the Sierra Nevada batholith. Field data indicates that the mafic and silicic magmas were emplaced in multiple pulses.

California, Geology, Stratigraphic, Stratigraphy, Cretaceous period, Batholiths

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