Layering, compaction and post-magmatic processes in the Klokken intrusion ( Greenland).

Abstract

The Klokken complex in S Greenland (age 1166+ or -3 Ma) is a stock of layered syenite with an outer zone of gabbro. These rocks show sub-vertical layering and probably developed on the walls of an originally gabbroic magma chamber, which fed alkali-basaltic volcanism. This chamber was finally filled by a syenitic liquid which fractionated in situ. The gabbros were affected by a hydrothermal fluid from the envelope rocks, but the syenites interacted with a relatively fluorine-rich deuteric fluid.-from Authors