Physical Sciences and Mathematics Commons^™

A La-Icpms Sr Isotope And Trace Element Study Of Plagioclase And Clinopyroxene Of The Higganum Dike, Connecticut: Determining The Magma Source Of The Central Atlantic Magmatic Province, Caprise Steadman Harper

Theses and Dissertations

The Higganum dike of Connecticut is one of the earliest basaltic dikes of the Central Atlantic Magmatic province and is geochemically representative of the widespread low-Ti basaltic lavas (~1 wt % TiO2) that make up the majority of the province in North America. Liquid compositions calculated from Cr-rich clinopyroxene cores from the Higganum dike are significantly more primitive than the bulk rock with average Mg# s of 0.63 compared to the Higganum dike which has Mg #'s ~ 0.55. However, the negative Nb and positive Pb anomalies that are seen in trace element patterns of the low-Ti group are also …