COMPARING THE CHEMISTRY OF THE ELZEVIR BATHOLITH TO THE WESLEMKOON AND NORTHBROOK BATHOLITHS, ONTARIO, CANADA

The Elzevir Batholith is located about 200 km northeast of Toronto, ON, Canada. It is part of a suite of tonalitic batholiths that intruded approximately 1270 Ma as part of a magmatic arc. Similar ages and major element compositions have led studies to suggest that these batholiths may be petrogenetically related. The purpose of this study is to compare new data from the Elzevir to already published data from earlier works and to compare the composition of the Elzevir to the nearby tonalitic batholiths in the suite.

Eleven samples were analyzed to find major oxide and 11 trace element concentrations using X-Ray Fluorescence (XRF). Our major oxides lie on the same chemical trend as the published data, but have a narrower range (67.50 - 71.45 wt.% SiO₂ compared with 64.76 - 75.70 wt.% SiO₂ for published values).

The Elzevir samples show the greatest similarity to the Weslemkoon batholith located directly north. When comparing the Elzevir and Weslemkoon Batholiths, the major oxides show chemical similarities. However, elements Zr, Zn and Ti present differences between the two batholiths. Our Elzevir samples occupy a compositional gap that exists in the Weslemkoon. Most of the published data matches a lower Zr compositional trend also found in the Weslemkoon samples.

The Elzevir and Northbrook Batholiths have chemical similarities with respect to major oxides. However, Elzevir data have lower Sr concentrations relative to the Northbrook. Rb/Sr ratios also show a distinct division between the batholiths.

Elzevir samples are currently being analyzed for 29 trace elements using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). These analyses will help further distinguish between the Elzevir and surrounding batholiths. The Weslemkoon and Northbrook batholiths can be distinguished from one another based on trace elements Sm, Y, Nb and Th. We anticipate our results will allow us to determine how the Elzevir compares.