Abstract
Two cinder cones and associated basaltic lava flows near Williams, Arizona, contain numerous inclusions of ultramafic and of felsic material. Many of the felsic inclusions are semifused and contain high 87 Sr/ 86 Sr ratios, yet the enclosing basalts do not show any enrichment in 87 Sr when compared with other local basalts. Brown glass within a quartz monzonite inclusion has a much higher 87 Sr/ 86 Sr ratio than the inclusion as a whole. This is believed to reflect the domination of early-forming melts by biotite. If so, separation and assimilation of this glass by a magma offers a mechanism to increase the 87 Sr/ 86 Sr ratio of that melt without significant bulk assimilation of granitic material.
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.
