| We interpret them to be partial melts of asthenospheric mantle underlying the Antarctic Peninsula magmatic arc. |
| A tholeiitic suite of dolerite dykes in the southwestern Borrowdale Volcanic Group is a separate, later magmatic event. |
| Thin-section analysis shows that the minerals forming the magmatic foliation do not show any signs of deformation or recrystallization. |
| These differences in age and regional distribution, together with those in chemistry and mineralogy, suggest two separate magmatic regimes. |
| This area is a good example of the interplay of tectonic and magmatic processes. |
| In this paper, we discuss the tectonic settings and magmatic processes which allow these magmas to reach the surface. |
