Abstract
[1] We measured noble gases in olivines extracted from alteration-free samples of the Udachnaya-East kimberlite pipe, eastern Siberia. Neon isotope ratios indicate that the kimberlite has a less nucleogenic Ne signature than a typical mid-ocean ridge basalt (MORB) source, which is consistent with the less radiogenic 40Ar/36Ar ratio compared to MORB and subcontinental lithospheric mantle (SCLM) sources. Based on He-Ne systematics, the 3He/4He ratio of the plume source of the Udachnaya kimberlite pipe would be higher than 15 RA with the dominant He signature of the magma acquired by assimilation of SCLM and/or crustal material during magma ascent. Our results indicate that the source of the Udachnaya kimberlite has similar noble gas characteristics to those of ocean island basalts (OIBs). Its origin is therefore deeper than that of the MORB source mantle, and probably is the same as the OIB-source mantle.
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.
