Cortlandt Complex; differentiation and contamination in plutons of alkali basalt affinity

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Abstract
Quantitative geochemical modelling reveals that the various plutons can be related by fractionation and/or accumulation in varying proportions of kaersutite, olivine, clinopyroxene, orthopyroxene, biotite, and plagioclase. Strontium isotopic data support a crystallization age of 440 my and also show that individual plutons have varied and distinct initial ratios which reflect mantle heterogeneity or varying degrees of crustal contamination. The presence of many diverse alkalic rock types in such close proximity is not only indicative of the complexity of the magmatic plumbing system but also of the unusual tectonic conditions that must have existed in the Cortlandt region during emplacement near the end of the Taconic Orogeny.--Modified journal

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