Abstract
Charnockitic rocks that occur in many Proterozoic high-grade metamorphic terrains correspond to regions of crustal thickening and are often associated with continental collision processes. The charnockites of the Highland Group of Sri Lanka represent this type and show genetic relationships to the central High-land Group. Geochemical investigations indicate that charnockites play a key role in the formation of the gem minerals. It seems probable that the contact metamorphic effects of charnockitic plutonic activity in the highly aluminous metasediments such as those found in Sri Lanka result in the formation of an assemblage of gem minerals such as sapphirine, cordierite, spinel, ruby and corundum. The pegmatites with which gem minerals like beryl, chrysoberyl and tourmaline are associated can also be considered as being derived from a charnockitic parent.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
