Mixed Caledonian appinite magmas: implications for lamprophyre fractionation and high Ba-Sr granite genesis

Article Abstract:

Elemental/isotopic surveys of mixed Caledonian appinite magmas reveal a high level of interaction between lamprophyric and syenitic magmas that resemble the petrogenesis of high Ba-Sr granitoids. Analysis of the high Ba and Sr, and light REE abundances, along with incompatible element ratios of the derived magmas, shows the possibility of large mantle components representing recent additions to the crust. The magmas prominently exhibit sharp-sided granite veins.

Fractionation, Fractional distillation, Granite, Biotite

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The relationship between E- and N-type magmas in the Baffin Bay lavas

Article Abstract:

The magmatic history of the Baffin Bay lavas is analyzed. The trace element study shows the existence of two stratigraphically-interbedded primary magmas with affinities with N-Mid-Ocean Ridge Basalts (MORB) and E-MORB. Although the two primary magmas are indistinguishable in terms of trace elements and petrography, compositionally different mantle sources are required to explain the two distinct magma types observed in Baffin Bay.

Baffin Bay

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Late Archaean crust-mantle interactions: geochemistry of LREE-enriched mantle derived magmas. Example of the Closepet batholith, southern India

Article Abstract:

A study shows that Closepet batholith, South India, is made up of at least two groups of intrusions. Mixing of two unrelated end-members from different source regions, namely enriched peridotitic mantle and Peninsular Gneisses, could be the cause of continuous variation of the magmatic bodies. The composite Closepet batholith formed due to large-scale mixing between the mantle and crustal melts.

India, Geology, Stratigraphic, Stratigraphy, Archean Eon, Batholiths

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