Abstract
Summary A Rb/Sr age of 445 ± 15 m.y. has been determined for the Threlkeld Microgranite, which is thus the oldest dated intrusion in the Lake District. In Bramcrag Quarry, the microgranite is intruded into the basal sediments of the Borrowdale Volcanic Group. It is thought to have been emplaced at the base of the volcanic pile towards the end of Borrowdale volcanism in earliest Caradoc times.
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.
