Abstract
The initial (87Sr/86Sr) ratios of alkali rocks from the Line chain (Line Islands) in the Pacific Ocean are variable, but may be divided into three groups; (1) The low (87Sr/86Sr) ratios of the main chain (∼0.7031). (2) The high (87Sr/86Sr) ratios for the site located off the main chain (∼0.7043). (3) The low (87Sr/86Sr) ratios of the Line Cross chain (∼0.7034), which is not clearly discriminated from the main chain. The low (87Sr/86Sr) ratios of alkali basalts seem to suggest that the magma sources of hot spots are in the ‘depleted’ upper portion of the mantle, in spite of the fact that the hot spots should be situated in the deep position of the mantle.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.