| During the early Gardar period, around 1350 Ma, basaltic lavas were erupted and syenitic plutons were emplaced. |
| These deposits are intimately associated with the porphyric parts of intermediate to acid plutons in orogenic belts. |
| Within the Grenville basement these are represented by alkalic to tholeiitic mafic dykes and alkalic to peralkaline granite plutons. |
| The igneous complex is composed of four steep-walled plutons separated by country rock septa and surrounded by a zone of small stocks and veins. |
| Numerous undated granitic and dioritic plutons intrude the Palaeozoic rocks and form large areas of Karlik Tagh and Barkol Tagh. |
| Contacts between plutons of gabbro or hybrid rock and granite are commonly marked by net-vein complexes. |
