Skip to Main Content
Skip Nav Destination

Numerous northwest-trending (average, N40°W) diabase dikes of Mesozoic age intrude the Piedmont of northwestern South Carolina. Samples of the diabase were analyzed for major- and trace-element abundances and mineral chemistry. All samples are olivine tholeiite, containing 4 to 25% modal olivine. Plagioclase comprises 39 to 64% and pyroxene, dominantly augite, 13 to 45% of the diabases. Two contrasting pyroxene trends are represented: (1) augite → subcalcic augite (± low-Ca pyroxene), and (2) augite → ferroaugite (no low-Ca pyroxene). These are attributed to modest (about 2 wt%) differences in SiO2 and iron oxide in the diabase magmas. The diabases also...

You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Close Modal

or Create an Account

Close Modal
Close Modal